Co-, Fe-, Or Ni-base Components, Alternative To Each Other Patents (Class 428/678)
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Patent number: 5001018Abstract: An Fe-Co base magnetic material comprising periodically laminated structure which consists of an Fe layer which has the bcc (110) plane in the lamination plane, an Fe-Co alloy layer which has the bcc (110) plane in the lamination plane and is laminated on said Fe layer and a Co layer which has the hcp (101) plane in the lamination plane and is laminated on said Fe-Co alloy layer, which laminated structure has controlled magnetostriction.Type: GrantFiled: September 29, 1989Date of Patent: March 19, 1991Assignees: Kanegafuchi Chemical Industry Co., Ltd., TDK Corporation, Nippon Mining Co., Ltd., NEC Corporation, Seisan Kaihatsu Kagaku KenkyushoInventors: Toshio Takada, Tetsuo Okuyama, Kenichi Yoden, Teruya Shinjo
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Patent number: 4996117Abstract: A high-temperature protective coating comprising a ceramic material, in particular for structural components of super-alloys, characterized in that at least one oxide of a metal of subcolumn 4 of the periodic table of elements is stabilized with at least one further oxide of a metal and is enveloped in a corrosion-resistant manner, at least in some regions, by at least one ceramic material.Type: GrantFiled: September 25, 1989Date of Patent: February 26, 1991Assignee: BBC Aktiengesellschaft, Brown, Boveri & CieInventors: Wing F. Chu, Franz J. Rohr
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Patent number: 4994329Abstract: A process of nickel plating for forming a plated film having a high phosphorus content according to this invention comprises the steps of: a first step of electroless plating a substance to be plated in an electroless plating bath capable of forming an electroless plated film having a phosphorus content of from 0.20 to 0.25 in atomic ratio of phosphorus with respect to nickel taken as one (1); and a second step of electroplating the substance to be plated by applying an electric current having an electric current density of from 1 to 10 A/dm.sup.2, and the substance to be plated being left immersed in the electroless plating bath continuously, thereby laminating an electroplated film on the surface of the electroless plated film. The process of nickel plating can form a plated film having a remarkably improved wettability with respect to solders since the electroplated film is formed on the electroless plated film having the high phosphorus content.Type: GrantFiled: November 15, 1989Date of Patent: February 19, 1991Assignee: Aisin Seiki Kabushiki KaishaInventors: Taketoshi Kaimasu, Takayoshi Tsuzuki
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Patent number: 4992336Abstract: A magneto-optical recording medium is disclosed, comprising a substrate having thereon a recording layer comprising laminated thin films of rare earth metals and transition metals, wherein said recording layer has a structure such that a unit of laminated thin films is periodically laminated in the thickness direction of the recording layer, and each unit of said laminated thin films is composed of at least four thin films and includes a thin film of a rare earth metal having disposed adjacent to both surfaces of the thin film of the rare earth metal a thin film of a transition metal as the upper and lower layers.Type: GrantFiled: June 21, 1989Date of Patent: February 12, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Ryoichi Yamamoto, Takashi Yamada
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Patent number: 4988578Abstract: A film of magnetic recording media is formed by sputtering an alloy of cobalt and platinum onto a substrate. The sputtering takes place in a chamber containing argon and nitrogen. The magnetic coercivity of the resulting film is controlled by varying the concentration of nitrogen in the sputtering chamber. By using this technique, the film coercivity is controlled without varying other important parameters such as the saturation magnetization. The film coercivity can also be controlled by varying the concentration of oxygen in the sputtering chamber.Type: GrantFiled: February 22, 1990Date of Patent: January 29, 1991Assignee: Komag, Inc.Inventors: Tsutomu T. Yamashita, Ching-Cheng Shir, Tu Chen
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Patent number: 4987039Abstract: There is disclosed a magnetic recording medium comprising a non-magnetic substrate and a magnetic membrane composed of Co and oxygen formed thereon, which is characterized in that the saturated magnetic flux density of said magnetic layer is in the range of 8,400 G to 12,600 G, the oxygen content of said layer is in the range of 11 to 29 at %, and the residual magnetization in the in-plane direction of the membrane surface, Mr , and the residual magnetization in the perpendicular direction to the membrane surface Mr.perp., have a relation satisfying Mr /Mr.perp.>1 and the C-axis of Co of the magnetic membrane is oriented in a perpendicular direction to the membrane surface.Type: GrantFiled: March 30, 1988Date of Patent: January 22, 1991Assignee: Hitachi, Ltd.Inventors: Hideo Daimon, Osamu Kitakami, Hideo Fujiwara
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Patent number: 4966820Abstract: A ceramic-coated heat resisting alloy member comprises a base metal mainly composed of at least one of nickel, cobalt and iron; a mixture layer which is deposited on the external surface of the base metal and which comprises a ceramics and a metal; an alloy layer which is formed between the mixture layer and a ceramic coating layer formed as an outermost layer and which comprises an alloy material exhibiting excellent resistance to high temperature oxidation and excellent resistance to high temperature corrosion. It is therefore possible to prevent any high temperature oxidation and high temperature corrosion of the mixture layer and to enable the mixture layer to have a satisfactory function of reducing the thermal stress produced between the ceramic coating layer and the base metal. The ceramic coating thus has a satisfactory thermal barrier effect on the base metal.Type: GrantFiled: May 3, 1989Date of Patent: October 30, 1990Assignees: Hitachi, Ltd., The Tokyo Electric Power CompanyInventors: Yoshitaka Kojima, Akira Mebata, Akihiko Chiba, Ryoichiro Ohoshima, Norio Watanabe, Yukiyoshi Hara
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Patent number: 4962005Abstract: A method including aluminization treatment preceded by a palladium predeposition treatment, the palladium being associated with at least one barrier metal selected from nickel, cobalt, and chromium, thereby avoiding hydrogen occlusion.Type: GrantFiled: October 11, 1989Date of Patent: October 9, 1990Assignee: Office National D'Etudes et de Recherches AerospatialesInventors: Serge Alperine, Pierre Josso
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Patent number: 4950550Abstract: A composite member particularly suited for anti-theft security systems is composed of a core of soft-magnetic material having a nickel-iron alloy (in weight percent) of 55 through 82 nickel, 0 through 4 molybdenum, the remainder iron, or an aluminum-iron alloy having 5 through 16% aluminum, the remainder iron, with a cobalt-vanadium-iron alloy or a cobalt-chromium-iron alloy envelope for the composite member.Type: GrantFiled: June 12, 1989Date of Patent: August 21, 1990Assignee: Vacuumschmelze GmbHInventors: Christian Radeloff, Gerd Rauscher, Hans Warlimont
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Patent number: 4950548Abstract: The present invention relates to a magnetic recording medium for a magnetic disk unit or the like and, more particularly, to a magnetic recording medium having its recording layer made of a magnetic alloy film with uniform magnetic characteristics. The present magnetic recording medium comprises a non-magnetic substrate, at least two sputtered layers of chromium thin film having a bow-like columnar structure which chromium thin film is laminated on the substrate, another sputtered layer of a magnetic alloy thin film laminated on the chromium thin film, and a protective layer laminated on the magnetic alloy thin film. The present invention is effective in reducing modulation of regenerative output relatively independent of a texture roughness of the substrate.Type: GrantFiled: May 23, 1989Date of Patent: August 21, 1990Assignee: Hitachi, Ltd.Inventors: Kenji Furusawa, Katsuo Abe, Hiroyuki Kataoka, Tokuho Takagaki, Yoshihiro Shiroishi, Norikazu Tsumita
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Patent number: 4939046Abstract: A magnetic recording medium employing the ferromagnetic film as the magnetic layer is disclosed in which the non-magnetic metal and/or the non-magnetic metal oxide are diffused into the ferromagnetic film along the direction of film thickness so that the concentration distribution will become substantially uniform. The magnetic recording medium has a high rectangular ratio and a low dispersion of the coercive force.Type: GrantFiled: March 11, 1988Date of Patent: July 3, 1990Assignee: Sony CorporationInventor: Kenji Yazawa
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Patent number: 4934254Abstract: Mechanical seals are imroved in wear properties, erosion, corrosion and galling resistance by forming a diffusion coating in the seal structure surface comprising an intermetallic compound of the seal structure iron, nickel or cobalt base metal and one or more of aluminum, boron, silicon and carbon.Type: GrantFiled: March 29, 1984Date of Patent: June 19, 1990Inventors: Eugene V. Clark, George K. Sievers
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Patent number: 4933239Abstract: A protective coating system for superalloys is described. The coating is an active element enriched aluminide, and can be formed by aluminizing an overlay coated superalloy, wherein during the aluminizing process, aluminum diffuses completely through the overlay coating and into the substrate. The coating system exhibits desirable oxidation resistance and resistance to thermal fatigue cracking, due to the presence of oxygen active elements in the overlay.Type: GrantFiled: March 6, 1989Date of Patent: June 12, 1990Assignee: United Technologies CorporationInventors: Walter E. Olson, Dinesh K. Gupta
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Patent number: 4929516Abstract: A semiconductor die attach system adapted for attaching a semiconductor die to a substrate is provided. A metallic buffer component for dissipating thermal stresses is disposed between the substrate and the semiconductor die to dissipate stresses created from thermal cycling of the substrate and the die. The metallic buffer component is sealed between the substrate and the die with a silver-tin sealing composition. A bonding material may be used alone to bond a die to a substrate and dissipate stresses from thermal cycling.Type: GrantFiled: February 10, 1986Date of Patent: May 29, 1990Assignee: Olin CorporationInventors: Michael J. Pryor, Julius C. Fister, Narendra N. Singhdeo, Deepak Mahulikar, Satyam C. Cherukuri
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Patent number: 4916022Abstract: A ceramic thermal barrier coating system for superalloy components subjected to high operating temperatures, such as gas turbine engine airfoils, is disclosed which includes a titania doped interfacial layer between the metallic substrate and the ceramic overcoat in order to better resist failure by spalling.Type: GrantFiled: November 3, 1988Date of Patent: April 10, 1990Assignee: Allied-Signal Inc.Inventors: Patricia A. Solfest, Thomas E. Strangman
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Patent number: 4910092Abstract: A protective coating system for superalloys is described. The coating is an yttrium enriched aluminide, and can be formed by aluminizing an MCrAlY coated superalloy, wherein during the aluminizing process, aluminum diffuses completely through the MCrAlY coating and into the substrate. The coating system exhibits desirable oxidation resistance and resistance to thermal fatigue cracking.Type: GrantFiled: December 3, 1987Date of Patent: March 20, 1990Assignee: United Technologies CorporationInventors: Walter E. Olson, Dinesh K. Gupta
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Patent number: 4900640Abstract: A low coefficient of expansion alloy is coated with a thermal barrier coating having a low coefficient of expansion compatible with the alloy. The alloy, preferably a 900 series iron-base alloy, includes an oxidation resistant intermediate bond coating and a zirconia containing thermal barrier. An article of manufacture made from this material could be utilized in heat engines where close tolerances are mandated.Type: GrantFiled: April 19, 1988Date of Patent: February 13, 1990Assignee: Inco LimitedInventors: James A. E. Bell, John J. deBarbadillo
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Patent number: 4882231Abstract: The magneto-optical recording medium is disclosed which has a laminous structure with a first magnetic film suited to provide a large rotation angle of the plane of polarization by magneto-optical interaction, a third magnetic film having a great coercive force, and a second magnetic film interposed therebetween to magnetically couple the first and third magnetic films at room temperature, wherein such magnetic coupling is substantially interrupted at a temperature in a recording operation.Upon recording signal on the medium, a laser beam is irradiated to the medium and raises the temperature of the medium near Curie temperature Tc3 of the third magnetic film, thus direction of the magnetization is determined by the magnetic field applied to the irradiated portion.Upon cooling the irradiated portion, the second magnetic film serves to magnetically couple the first and third magnetic film, the magnetization of the third film is transferred to the first film.Type: GrantFiled: November 30, 1988Date of Patent: November 21, 1989Assignee: Sony CorporationInventor: Katsuhisa Aratani
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Patent number: 4877690Abstract: A magnetic optical recording element including a rare earth-transition metal recording layer, a barrier layer and a self-passivating active metal layer.Type: GrantFiled: March 1, 1989Date of Patent: October 31, 1989Assignee: Eastman Kodak CompanyInventors: David A. Glocker, Tukaram K. Hatwar, Gregory Lynn McIntire, Srinivas T. Rao, Douglas G. Stinson
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Patent number: 4869971Abstract: A process for electrodepositing a multilayer deposit on an electrically-conductive substrate from a single electrodeposition bath yields a deposit which includes a sequence of essentially repeating groups of layers. Each group of layers comprises a layer of a first electrodeposited material and a layer of a second electrodeposited layer. The process includes the steps of immersing the substrate in an electrodeposition bath and repeatedly passing a charge burst of a first electric current and a second electric current through the electrodeposition bath to the substrate. The first electric current is a pulsed current with a first pulsed-on/off waveform and a first peak current density which is effective to electrodeposit the first electrodeposited material. The second electric current has a second waveform and a second current density which is effective to electrodeposit the second electrodeposited material.Type: GrantFiled: January 23, 1989Date of Patent: September 26, 1989Inventors: Chin-Cheng Nee, Rolf Weil
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Patent number: 4869970Abstract: An electromagnetic radiation attenuating coating comprising an electronic housing base material coating with a first electroless metal alloy of copper, a member from the group of nickel, cobalt and mixtures of nickel and cobalt, and phosphorus rich in copper and a second electroless metal alloy of copper, a member from the group of nickel, cobalt and mixtures of nickel land cobalt, and phosphorus rich in nickel. The coating provides superior radiation attenuation and comprises fewer processing steps in its formation.Type: GrantFiled: November 9, 1987Date of Patent: September 26, 1989Assignee: Shipley Company Inc.Inventors: Michael Gulla, Terrell A. Benjamin, Mark Farsi
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Patent number: 4863810Abstract: A method of providing corrosion resistant substrates having an amorphous metallic alloy coating thereon. The method comprises depositing refractory and transition elements, such as Ni, Nb, Ti and Cr, onto the substrate to provide a crystalline metallic layer thereon which is then irradiated to convert the layer into an amorphous metallic coating on the substrate. The coated substrate displays a corrosion resistance which is at least about four orders of magnitude greater than for the uncoated substrate in both lN HNO.sub.3 and 0.1 N NaCl aqueous solutions.Type: GrantFiled: September 21, 1987Date of Patent: September 5, 1989Assignee: Universal Energy Systems, Inc.Inventors: Rabi S. Bhattacharya, Amarendra K. Rai, Peter P. Pronko, Charbel Raffoul
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Patent number: 4857418Abstract: A magnetic, solid state memory cell or sensor includes a magnetoresistive, ferromagnetic layer and a resistive layer overlying the magnetoresistive layer. The resistivity and dimensions of the resistive layer are such that, preferably, only a small fraction of any sense current flowing through the cell or sensor will flow between input and output contacts by way of the resistive layer, yet the magnitude of the sense current will not be reduced below a desired signal level due to the presence of the resistive layer. The resistive layer is comprised of a material which will not diffuse into the magnetoresistive layer. A compound or mixture of a metal and either nitrogen or oxygen, such as tantalum and nitrogen, is preferred as the resistive layer. It is also preferred that the resistive layer be nonmagnetic.Type: GrantFiled: December 8, 1986Date of Patent: August 15, 1989Assignee: Honeywell Inc.Inventor: James A. Schuetz
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Patent number: 4853291Abstract: A filler metal for brazing parts made of superalloys has a brazing temperature of 1025.degree.-1080.degree. C., a solidus temperature above 1000.degree. C., a liquidus temperature above 1018.degree. C. and a composition of, in weight percent, 5-30 gold, 15-35 palladium, 10-30 nickel, 20-48 copper, 5-25 manganese.Type: GrantFiled: October 26, 1988Date of Patent: August 1, 1989Assignee: GTE Products CorporationInventor: Howard Mizuhara
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Patent number: 4851300Abstract: A thin film noble metal temperature sensor includes adjacent layers of metals and metal oxides on the surface of a component. The most preferred sequence of layers are: a NiCoCrAlY layer applied directly to the component surface; a thermally grown aluminum oxide layer on the NiCoCrAly layer; a sputtered layer of aluminum oxide on the thermally grown layer of aluminum oxide; a FeCrAl layer on the sputtered aluminum oxide layer; and layer of platinum and platinum-rhodium on the FeCrAl layer.Type: GrantFiled: May 9, 1988Date of Patent: July 25, 1989Assignee: United Technologies CorporationInventor: John S. Przybyszewski
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Patent number: 4844943Abstract: A process is provided for protecting metallic surfaces such as stainless steel, against vanadosodic corrosion which utilizes at least one metal such as the alkaline earth metals which oxidizes in situ into a protective layer. The layer forms a compound with vanadium and/or sodium oxide which has a softening point higher than that of the oxide.Type: GrantFiled: September 10, 1987Date of Patent: July 4, 1989Assignee: Elf FranceInventors: Evelyne M. Chassagneux, Gerard A. Thomas
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Patent number: 4836865Abstract: The disclosed magnetic nitride T-M-N film (T is at least one metal selected from the group consisting of Fe, Co, Ni and Mn; M is at least one metal selected from the group consisting of Nb, Zr, Ti, Ta, Hf, Cr, W and Mo; N is nitrogen (N)) has excellent wear resistance and high electric resistivity, and the compositionally modulated nitride film shows a soft magnetic property, as well as thermal stability of the properties.Type: GrantFiled: March 10, 1987Date of Patent: June 6, 1989Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Sakakima, Koichi Osano, Yuji Omata, Mitsuo Satomi, Koichi Kugimiya
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Patent number: 4833041Abstract: Corrosion and wear resistant metallic compositions containing nickel, cobalt, boron and thallium and articles coated therewith are described. Preferred electroless coatings contain nickel and cobalt in a ratio of about 45:1 to about 4:1 and are deposited as hard, amorphous alloy nodules of high nickel content dispersed or rooted in a softer alloy of high cobalt content. The coatings are preferably deposited on catalytically active substrates from an electroless coating bath containing nickel ions, cobalt ions, thallium ions, metal ion complexing agents and a borohydride reducing agent at pH about 12 to about 14. With post-coating heat treatment coated surfaces exhibit hardness levels as high as about 1300 Knoop.Type: GrantFiled: December 5, 1986Date of Patent: May 23, 1989Inventor: C. Edward McComas
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Patent number: 4830934Abstract: An improved mixture of alloy powders is provied for use in treating a preselected article alloy, for example, to repair or join multiple components of the article. The mixture has at least three distinct groups of alloy powders which together define a mixture composition range, with each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy. In a preferred form, the mixture composition range comprises, by weight, 15-30% Cr, 1.5-6% W, 0.4-4% Al, 1-11% Ti, 1-6% Ta, up to 1.5% B, up to 0.5% Si, up to 0.2% Zr, up to 3% Mo, up to 0.3% Hf, up to 6% Cb, up to 2% Re, with the balance selected from Co and Ni along with incidental impurities.Type: GrantFiled: June 1, 1987Date of Patent: May 16, 1989Assignee: General Electric CompanyInventors: Stephen J. Ferrigno, Mark Somerville, William R. Young
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Patent number: 4826738Abstract: The adherence of protective chromia (chromium oxide) scales on Ni-Cr coatings is substantially improved by limiting the amount of sulfur in the coating composition to below about 5 parts per million by weight. Volatilization of the chromium oxide scale is also reduced by controlling the sulfur content. The coatings of this invention have improved resistance to oxidation and hot corrosion degradation than the coatings of the prior art.Type: GrantFiled: July 7, 1987Date of Patent: May 2, 1989Assignee: United Technologies CorporationInventor: John G. Smeggil
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Patent number: 4818626Abstract: To permit using a single firing step, sintered aluminum nitride ceramic bodies provided with firmly adhering electrically conductive films or resistive layers can be produced by sintering of the green ceramic bodies and the films or layers in common, if these films or layers additionally contain a mixture of aluminum nitride and rare earth metal oxide.Type: GrantFiled: August 3, 1987Date of Patent: April 4, 1989Assignee: W. C. Heraeus GmbHInventors: Waltraud Werdecker, Dieter Brunner, Martin Kutzner
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Patent number: 4814236Abstract: A laminated metal structure and a method of hardsurfacing stainless steel base metals are herein provided for resisting wear of steam turbine components at elevated temperatures. The laminated metal structure employs a buttering layer, sandwiched between the stainless steel base metal and a hardsurfacing layer. The buttering layer consists essentially of nickel or a nickel-based alloy and is selected to have a coefficient of thermal expansion which is between that of the base metal and that of the hardsurfacing material. This improved structure produces a relatively crack-free deposit that can provide greater service life for turbine components with less downtime due to repairs.Type: GrantFiled: June 22, 1987Date of Patent: March 21, 1989Assignee: Westinghouse Electric Corp.Inventors: Javaid I. Qureshi, Roland H. Kaufman, Michael E. Anderson, William L. Spahr
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Patent number: 4814239Abstract: A vertical magnetic recording medium excellent in durability and recording property in which a first magnetic film comprising Co--Cr or Co--Cr--W as the main ingredient is formed on a substrate and the second magnetic film comprising Co--Cr--W--C as the main ingredient is formed on the first magnetic film, as well as the production process therefor are provided.Type: GrantFiled: March 24, 1988Date of Patent: March 21, 1989Assignee: Ube Industries, Ltd.Inventors: Kazuo Inoue, Motozo Yoshikiyo, Shizuka Yoshii, Iwao Okamoto
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Patent number: 4810592Abstract: Disclosed is a thin film magnetic recording medium which comprises a substrate and a magnetic layer formed on the substrate, the magnetic layer including a lamination composed of at least a grain size suppression film and a magnetic film formed on each of opposite sides of the grain size suppression film, the grain size suppression film being made of at least a grain size suppressing metal, the magnetic film being made of a cobalt magnetic material, and further disclosed is a method of producing a thin film magnetic recording medium which comprises the step of: dipping a substrate in an electroless plating solution for depositing a crystal of a cobalt magnetic material on the substate to form a first crystal film thereon; adding a metallic salt solution for suppressing growth of a grain size of a crystal structure into the electroless plating solution at least once after a predetermined period of time has passed from the dipping of the substrate under the condition that the substrate is dipped in the electrolType: GrantFiled: May 4, 1987Date of Patent: March 7, 1989Assignee: Brother Kogyo Kabushiki KaishaInventor: Takeshi Miyabayashi
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Patent number: 4801513Abstract: The additions of minor additions of hafnium and silicon and mixtures thereof to nickel base superalloy single crystal articles provide significantly improved oxidation resistance. The oxidation resistance is improved both for the case of uncoated articles and in the case where a protective coating such as for example, a MCrAlY coated is present. For example the addition of 0.1% hafnium is observed to improve the oxidation resistance by a factor of 4 at 2100.degree. F. and a similar addition improved the coating oxidation resistance by a factor of about 2.5 at 2150.degree. F.Type: GrantFiled: October 16, 1984Date of Patent: January 31, 1989Assignee: United Technologies CorporationInventors: David N. Duhl, Frederick A. Schwizer
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Patent number: 4798765Abstract: A perpendicular magnetic recording medium comprises a recording medium base, a lower layer formed on the recording medium base, and an upper layer formed on the lower layer. The lower layer is made of a first material including cobalt, chromium and one or more elements other than cobalt and chromium. On the other hand, the upper layer is made of a second material including cobalt, chromium and one or more elements other than cobalt and chromium. A quantity of the one or more elements added to cobalt and chromium making up the second material is less than a quantity of the one or more elements added to cobalt and chromium making up the first material.Type: GrantFiled: March 25, 1986Date of Patent: January 17, 1989Assignee: Victor Company of Japan Ltd.Inventors: Yasuo Ishizaka, Noboru Watanabe, Kazuo Kimura, Eiichiro Imaoka
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Patent number: 4794047Abstract: The method of manufacturing a magnetic recording medium according to the present invention comprises a first step in which a ferromagnetic metal layer of a predetermined thickness is formed on a substrate, and a second step contiguous to said first step and in which another ferromagnetic metal layer is formed by applying a bias voltage to the substrate. Since the ferromagnetic metal layer formed at the second step is excellent in corrosion resistance, even if a protective layer such as a carbon layer incurs a pit defect when the medium is being produced or even when the protective layer is separated, the ferromagnetic metal layer in consideration will not be corroded, thus preventing any error from occurring in data recording or reproduction.Type: GrantFiled: July 20, 1987Date of Patent: December 27, 1988Assignee: Hitachi, Ltd.Inventor: Susumu Funamoto
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Patent number: 4792497Abstract: Disclosed is a magnetic recording medium of the magnetic metal thin-film type for longitudinal recording, in which the noise is reduced by selecting the value of maximum torque L (the product of magnetic anisotropy energy Ku and magnetic layer volume v; as measured by setting the axis of rotation in plane of the medium) and the value of magnetic flux .phi. (the product of saturation magnetization Ms and magnetic layer volume v) from a range defined by 0<L/(2.pi..multidot..phi..sup.2)<4.times.10.sup.5 (erg/emu.sup.2).Type: GrantFiled: January 28, 1988Date of Patent: December 20, 1988Assignee: Hitachi, Ltd.Inventors: Hiroyuki Suzuki, Yoshihiro Shiroishi, Sadao Hishiyama, Tomoyuki Ohno, Kazuetsu Yoshida, Shyuichi Kojima, Susumu Funamoto, Yasushi Kitazaki, Sakae Ohta, Hajime Aoi
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Patent number: 4792486Abstract: A perpendicular magnetic recording medium comprises a recording medium base, a lower layer formed on the recording medium base, and an upper layer formed on the lower layer. The upper layer is made of cobalt-chromium, and the lower layer at least includes cobalt and chromium.Type: GrantFiled: April 4, 1988Date of Patent: December 20, 1988Assignee: Victor Company of Japan, Ltd.Inventors: Yasuo Ishizaka, Noboru Watanabe, Kazuo Kimura, Eiichiro Imaoka
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Patent number: 4786564Abstract: A method for manufacturing a disk includes the step of forming a first nickel-phosphorus alloy layer on an aluminum substrate, e.g., by electroless plating. A second nickel-phosphorus layer is then sputtered onto the first nickel-phosphorus layer, and a magnetic alloy is sputtered onto the second nickel-phosphorus layer. The magnetic alloy is typically sputtered immediately after the second nickel-phosphorus layer is formed without removing the disk from the sputtering apparatus between the time the second nickel-phosphorus layer is formed and the time the magnetic alloy is formed. Because of this, contaminants are not capable of lodging on or affecting the surface of the disk prior to formation of the magnetic alloy. The second nickel-phosphorus layer is typically amorphous and therefore masks any nonuniformities in the surface of the first nickel-phosphorus layer.Type: GrantFiled: February 25, 1987Date of Patent: November 22, 1988Assignee: Komag, Inc.Inventors: Tu Chen, Tsutomu T. Yamashita
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Patent number: 4781970Abstract: Strengthened ceramic and a method for increasing the mechanical strength of fully sintered ceramic articles, in particular alumina type ceramic and glass-ceramic articles. Such articles are strengthened by forming a compresssive material layer of amorphous silicon dioxide or refractory metal nitride on the surface of the article to be strengthened.Type: GrantFiled: July 15, 1987Date of Patent: November 1, 1988Assignee: International Business Machines CorporationInventors: Steven G. Barbee, Hung-Chang Huang, Donald J. Hunt, Jungihl Kim, Jae M. Park, Charles H. Perry, Da-Yuan Shih
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Patent number: 4777082Abstract: In an optical recording medium comprising a substrate and a recording layer thin film comprised of a rare earth element and a transition metal, for example, TbFeCo on the substrate, a metal thin film layer having a high magnetic permeability, for example, Permalloy is formed on the recording layer. A transparent dielectric film layer may be formed between the substrate and the recording layer thin film.Type: GrantFiled: August 17, 1987Date of Patent: October 11, 1988Assignee: TDK CorporationInventors: Hideki Ishizaki, Takayoshi Kobuke, Suguru Takayama
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Patent number: 4745031Abstract: In a magnetic recording medium of the hard disk type comprising a rigid substrate and a magnetic layer formed thereon, the substrate is plasma treated at frequencies in the range of 10 to 200 kHz in an inorganic gas containing O; N and H; and N, H and O.Type: GrantFiled: December 26, 1985Date of Patent: May 17, 1988Assignee: TDK CorporationInventors: Masatoshi Nakayama, Haruyuki Morita, Yuichi Kubota, Keiko Tsuchiya
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Patent number: 4745037Abstract: Brazing of metal parts employing a thin, homogeneous, ductile, filler metal foil is disclosed. The brazing foil, useful for brazing stainless steels, is less than about 0.064 mm (0.0025 inch) thick and has a composition consisting essentially of 0 to about 6 atom percent iron, 0 to about 21 atom percent chromium, 0 to about 4 atom percent molybdenum, 0 to about 5 atom percent tungsten, 0 to about 20 atom percent cobalt, 0 to about 19 atom percent boron, 0 to about 12 atom percent silicon, 0 to about 22 atom percent phosphorus, 0 to about 3 atom percent carbon and the balance nickel and incidental impurities. In addition to containing the foregoing elements within the above-noted composition ranges, the composition must be such that the total of iron, chromium, molybdenum, tungsten, cobalt and nickel ranges from about 70 to 84 atom percent and the total of boron, silicon, phosphorus and carbon ranges from about 16 to 30 atom percent.Type: GrantFiled: November 17, 1986Date of Patent: May 17, 1988Assignee: Allied CorporationInventors: Nicholas DeCristofaro, Peter Sexton
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Patent number: 4743514Abstract: A coating for protecting the surfaces of gas turbine components such as single crystal turbine blades and vanes, wherein the coating has a composition (in weight percent) consisting essentially of chromium, 15-35; aluminum, 8-20; tantalum, 0-10; tantalum plus niobium, 0-10; silicon, 0.1-1.5; hafnium, 0.1-1.5; yttrium, 0-1; cobalt, 0-10; and nickel, balance totalling 100 percent. A preferred coating, which is particularly desirable for use with single-crystal turbine blades and vanes, has a composition consisting essentially of chromium, 17-23; aluminum, 10-13; tantalum plus niobium, 3-8; silicon, 0.1-1.5; hafnium, 0.1-1.5; yttrium, 0-0.8; cobalt, 0-trace; and nickel, balance totalling 100 percent. A process for preparing the coated component is also described.Type: GrantFiled: June 29, 1983Date of Patent: May 10, 1988Assignee: Allied-Signal Inc.Inventors: Thomas E. Strangman, Steven J. Vonk
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Patent number: 4740430Abstract: Certain magnetic alloys are useful for a variety of applications including for magneto-optic memory storage media (optical disks). These magnetic alloys are difficult to protect against composition alteration through such processes as corrosion, oxidation, diffusion, etc. The invention is a multiple-layer structure which protects the magnetic alloys against diffusion as well as corrosion and oxidation without affecting performance of the magnetic alloy in the optical disk. Such magnetic memory storage devices exhibit high bit density and long life. They are erasable and inexpensive and highly advantageous for use in high-bit memory storage devices.Type: GrantFiled: February 18, 1987Date of Patent: April 26, 1988Assignee: American Telephone and Telegraph Company, AT&T Bell LaboratoriesInventors: Robert P. Frankenthal, Robert B. vanDover
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Patent number: 4737418Abstract: A lid for closing an electronics package exhibits a high corrosion resistance. The lid is formed of a metal substrate which is clad with rolled or worked nickel, and covered with a layer of gold or precious metal electroplate. At edges of the lid, which are not covered with cladding, a layer of nickel is electroplated, employing the dogbone effect to concentrate the metallization at the edges. The rolled or worked metal has a much smaller porosity than an electroplated layer, and the nickel cladding can be applied to the desired thickness in much less time than nickel electroplate.Type: GrantFiled: December 22, 1986Date of Patent: April 12, 1988Assignee: Advanced Materials Technology Corp.Inventor: James A. Slattery
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Patent number: 4731300Abstract: A perpendicular magnetic recording medium comprises a recording medium base, a low coercivity layer formed on the recording medium base and having a low coercivity in an in-plane direction thereof, and a high coercivity layer formed on the low coercivity layer and having a high coercivity in a direction perpendicular to a surface of the low coercivity layer. The low coercivity layer and the high coercivity layer are formed from the same magnetic material and constitute a magnetic layer. A method of manufacturing this perpendicular magnetic recording medium comprises a single magnetic layer forming process of successively and continuously forming the low coercivity layer and the high coercivity layer on the recording medium base by using the same magnetic material as a depositing material.Type: GrantFiled: February 26, 1986Date of Patent: March 15, 1988Assignee: Victor Company of Japan, Ltd.Inventors: Noboru Watanabe, Yasuo Ishizaka, Kazuo Kimura, Eiichiro Imaoka
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Patent number: 4729924Abstract: A metallic, thin film, magnetic recording medium is disclosed wherein the surface of the metallic thin film is modified such as to promote improved adhesion with protective lubricant. A process is disclosed wherein, for example, controlled oxidation of a metallic, thin film magnetic recording medium yields a homogeneous distribution of bonding sites and wherein application of a protective lubricant (e.g., perfluoropolyether compositions) provides a recording medium exhibiting superior wear and abrasion resistance.Type: GrantFiled: December 21, 1984Date of Patent: March 8, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Joseph Skorjanec, Carmen D. Moe
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Patent number: 4727005Abstract: A magneto-optical recording medium is disclosed. The medium comprises a substrate and a magnetic layer formed thereon. The magnetic layer has a multi layered structure in which rare earth metal element layers and transition metal layers are alternately superposed with each other, with layer thickness of the order of an atomic layer. The layer thickness of the rare earth metal element is selected not less than 2 .ANG. but less than 6 .ANG..Type: GrantFiled: July 28, 1986Date of Patent: February 23, 1988Assignee: Sony CorporationInventor: Noboru Sato