Abstract: An improvement in a magnetic recording disc having a protective overcoat is described. The overcoat extends between an inner-diameter landing zone and a data zone and has a thickness in the landing zone of at least 135 .ANG. and a thickness in the data zone of less than 90 .ANG..

Abstract: A photopolymerizable composition comprising a crosslinking agent, a UV sensitive photopolymerization initiator and a thioether compound having a vinyl ester or vinyl amide component; wherein the crosslinking agent and the thioether may be the same compound.

Abstract: An overwritable magneto-optical recording medium is disclosed. The recording medium comprises a first magnetic layer exhibiting vertical magnetic anisotropy and a second magnetic layer having a higher Curie temperature and a lower coercive force at room temperature in comparison with the first magnetic layer and exchange coupled with the first magnetic layer, wherein the second magnetic layer exhibits in-plane magnetic anisotropy and vertical magnetic anisotropy at room temperature and the vertical magnetic anisotropy relative to the in-plane magnetic anisotropy becomes larger in the vicinity of the Curie temperature of the first magnetic layer than at room temperature.Further, a recording method using the magneto-optical recording medium is also disclosed.

Abstract: A magnetic recording medium capable of making a high-density recording, with improved magnetic characteristics such as coercive force (Hc) and other factors, in which the flatness of the surface of a magnetic recording medium is maintained, and a method for the manufacture thereof are disclosed; by disposing a non-magnetic metal buffer layer 6 between a non-magnetic glass substrate 1 and a non-magnetic metal under layer 2 and keeping a ratio d.sub.1 /d.sub.2 of the half bandwidth of an X-ray diffraction peak of the metal buffer layer 6 and the metal under layer 2 predetermined values, a large increase in coercive force (Hc) can be obtained; in addition, by controlling the film thickness .delta. of the metal buffer layer 6 and the base substance temperature (T) when the metal buffer layer 6 is formed, magnetic characteristics such as squareness (S), coercive force squareness (S*), coercive force difference (.sub..DELTA. HC) and coercive force squareness difference (.sub..DELTA. S*) can be improved.

Abstract: A magnetic recording medium comprising a non-magnetic substrate and a magnetic alloy layer formed on the substrate with a non-magnetic primer layer containing chromium as the main component interposed therebetween, wherein the magnetic alloy layer contains cobalt and nickel as the main components and not more than 8 atomic % of boron and has been formed by sputtering under such a condition that a negative bias voltage is applied to the non-magnetic substrate.

Abstract: A rigid magnetic memory disc(28) is disclosed having a substantially flat, central hard core substrate(12) and an overlying smoothing layer(14) deposited thereon. The smoothing layer(14) is subsequently polished to a predetermined thickness. The smoothing layer(14) should be capable of having a surface finish better than approximately ten Angstroms Ra. After the smoothing layer(14) is polished, an appropriate magnetic medium(16) and alternately, a nonmagnetic finishing layer(16) are then applied to the rigid disc substrate(10) as necessary, ultimately rendering a finished magnetic disc.

Abstract: Substrates are disclosed having an ultra-smooth surface finish thereon rendering them useful in making high density magnetic storage components, such as a computer hard disk or thin-film head which can read and/or write data on such disks. The substrates are comprised of a non-oxide ceramic base which is coated with a smoothing layer comprised of amorphous, non-stoichiometric silicon carbide corresponding to the formula SiC.sub.x, wherein x is the molar ratio of carbon to silicon and is greater than 1. Also disclosed are processes for making the substrates and components.

Abstract: An improved wear-resistant protective coating for the surfaces of magnetic recording media devices that is formed of fluorinated diamond-like carbon and deposited by a plasma enhanced chemical vapor deposition process or other suitable methods to provide superior friction-reducing and stiction-reducing properties.

Abstract: A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetizatio

Abstract: A magnetic thin-film medium formed on a non-metallic substrate and having reduced noise characteristics, by virtue of a 5-50 .ANG., sputtered Cr-containing sublayer interposed between the substrate and a chromium underlayer. Also disclosed is a method of preparing the low-noise medium.

Abstract: The surface layer of a hard austenitic stainless steel screw is formed as nitrided layer and then is covered by a plating coat or a resin coat to give properties such as shortening the boring time as well as heightening the surface hardness of the screw itself.

Abstract: A magneto-optical recording medium comprises a base film having a certain crystal plane oriented in parallel to a substrate and a recording film formed on the base film. The recording film is composed of plural pairs of Mn alloy group magnetic thin film layer having a C-axis-oriented crystalline magnetic anisotropy and a nonmagnetic thin film layer having an interatomic spacing approximate to that of the base film, alternately laminated each other, so that the Mn alloy group magnetic film having a C-axis-oriented crystalline magnetic anisotropy is epitaxially grown on the substrate at a low temperature through the base film with high thermal stability and great magneto-optical effect.

Abstract: An electrode plate suitable for use in an electro-optical device, such as a liquid crystal device, is formed by successively disposing on a substrate a first layer of a transparent conductor film, a second layer of molybdenum or a molybdenum alloy, a third layer of aluminum or an aluminum alloy, and a fourth layer of molybdenum or a molybdenum alloy. The laminate electrode structure is patterned by a photolithographic process, followed by removal of the photoresist with a peeling liquid, during which the fourth molybdenum layer functions as a protective film for the third al layer against the peeling liquid to prevent the formation of electrode defects.

Abstract: This invention relates to a hydrogen storage active material comprising an alloy having the formula MmNi.sub.5-x-y-z Zn.sub.x Q.sub.y R.sub.z, in which Q.dbd.Al, Ca and Sr, R.dbd.Li, Na and K, 0<x.ltoreq.1, 0<y.ltoreq.0.8 and 0<z.ltoreq.1. An alloy phase of zinc is formed between the surface coating and the alloy base after treatment of the alloy powder by surface plating. As a result, the electrochemical capacity as well as the life of the hydrogen storage alloy electrode formed is increased significantly while the cost is greatly reduced by employing Zn.

Abstract: A metal substrate, e.g. titanium, having a calcium phosphate coating, particularly hydroxylapatite, and containing a metal such as cobalt, codeposited on the substrate by electrolyzing a cobalt salt, particularly cobalt sulfate, liquid electrolyte having a calcium phosphate material, particularly hydroxylapatite, suspended therein, employing a cobalt anode and the metal substrate as cathode. The particles of cobalt so codeposited with the particles of calcium phosphate material, e.g. hydroxylapatite, hold the latter particles strongly on the substrate metal. If desired, a second coating of the pure calcium phosphate material, e.g. "hydroxylapatite", optionally can be applied over the codeposited hydroxylapatite-cobalt coating. The calcium phosphate coated metal substrate of the invention, particularly the codeposited "hydroxylapatite"-cobalt coating, on a titanium or cobalt-chromium substrate, has particular value for application as medical implants, e.g.

Abstract: A microwave absorbing article of low density comprises a hollow or solid glass microsphere having a diameter of 1-100 microns, and, deposited thereon, a succession of layers of particulate iron material interspersed by a passivated iron skin.

Abstract: The present invention is designed to improve a method of deposition of coatings upon a metal or alloy substrate. The coating comprises aluminum or aluminide material interdiffused with a transition metal deposited by chemical vapor deposition which utilizes organometallic precursors to facilitate the deposition of the transition metal. The improvement permits better control of the process and permits coating of complex substrates including those with internal passages or holes. In the embodiment involving a first deposition of aluminum or aluminide coating, applicants have achieved deposition thereon of the transition metal. Platinum is the preferred transition metal to be used in the subject method. A product is taught. This product can be a component from a gas turbine engine.

Abstract: There is disclosed a perpendicular magnetic recording medium having a magnetic layer comprising magnetic metal corpuscles and their oxide formed on a nonmagnetic substrate, and having perpendicular magnetic recording read-write characteristics improved by dispersing the above described magnetic metal corpuscles in the oxide crystal having a NaCl type crystal structure so that the magnetic metal corpuscles may have an isotropic structure instead of a columnar structure. There are also disclosed a method for fabricating such a perpendicular magnetic recording medium and a read-write machine using such a perpendicular magnetic recording medium.

Abstract: The corrosion resistance inherent in stainless steel is further improved by a cladding layer provided on the surface thereof. The cladding layer is formed of a coating material which is applied onto the surface of the stainless steel and, then, burnt to be fused by laser beams. The coating material contains a larger amount of Cr than that of the stainless steel. The thus fused material and a fused portion of the stainless steel are mixed with each other to form the cladding layer of remarkable corrosion resistance due to a larger amount of Cr contained therein. The formation of the cladding layer on the inner surface of a small diameter pipe is enabled by a coating film shaping device which has a jig for shaping the applied material into a film of a uniform thickness and by a laser irradiation torch which has an arrangement for emitting the laser means radially outward from the inside of the pipe.

Abstract: A wear and erosion resistant coating for substrates having a non-nitrogen titanium-containing outer surface onto which a non-stoichiometric titanium nitride coating is deposited in which the nitrogen content in the titanium nitride coating is from 32.5 to 47 atomic weight percent.

Abstract: Zn-Mg alloy is plated by vapor deposition on the surface of metals. Since Zn and Mg are vapor-deposited as a vapor mixture of an optional ratio on the surface of metals, plated layers of excellent corrosion resistance, peeling resistance of coating film, formability, etc. can be formed. There is disclosed a method of forming uniform vapor mixtures of Zn and Mg, and vapor-depositing them on the surface of metals as the method forming the vapor-deposited layers.

Abstract: Disclosed is a multi-layered zinc-manganese alloy coating electrodeposited on sheet steel. The alloy layer closest to the surface of the sheet steel has a composition of at least 50% manganese while the composition of the other alloy layers farther removed from the surface of the sheet steel have less than 50% manganese.

Abstract: Zn-Mg alloy is plated by vapor deposition on the surface of metals. Since Zn and Mg are vapor-deposited as a vapor mixture of an optional ratio on the surface of metals, plated layers of excellent corrosion resistance, peeling resistance of coating film, formability, etc. can be formed. There is disclosed a method of forming uniform vapor mixtures of Zn and Mg, and vapor-depositing them on the surface of metals as the method forming the vapor-deposited layers.

Abstract: Optical recording media disclosed herein are excellent in recording sensitivity as well as in the adhesion of the substrate to the recording layer, said substrate consisting of a random copolymer of ethylene and a cycloolefin and having a specific structure.

Abstract: A calcium phosphate-coated composite material is disclosed, comprising a metallic substrate, an oxide layer on the metallic substrate, said oxide layer consisting essentially of the oxide of one or more metals selected from the group consisting of titanium, zirconium, hafnium, niobium, tantalum, tin, cobalt, aluminum, chromium, molybdenum and tungsten, and a coating layer of calcium phosphate provided on the oxide layer. A process for production of the calcium phosphate-coated composite material is also disclosed.

Abstract: A magnetic recording medium is described, comprising a support having provided thereon a thin magnetic metal vapor deposition film, said film being provided by evaporating a magnetic metal material from an evaporation source to generate a vapor flow and directing the vapor flow to contact a moving support at an inclined angle, and having a curved and inclined column structure formed by continuously altering the incident angle of said vapor flow on the moving support from a high degree (.theta..sub.max) to a low degree (.theta..sub.min), and a non-magnetic metal vapor deposition film provided on the magnetic metal film, said non-magnetic metal film being provided by continuously altering the incident angle of vapor flow of the non-magnetic metal material to the moving support on which the magnetic metal film is formed between a high degree (.theta..sub.max') and a low degree (.theta..sub.min').

Abstract: A magneto optical thin film recording medium is disclosed having very high carrier-to-noise ratios and high rotation angles. A transmission electron microscope photomicrograph (at 200,000.times.) of one such medium is shown in FIG. 1. These are multi-phase amorphous materials having magnetic anisotropy perpendicular to the plane of the thin film. They are produced in a triode vacuum sputtering process at vacuums in the range of 4.times.10.sup.-3 to 6.times.10.sup.-4 Torr. By adjusting process parameters such as substrate temperature, anode bias and deposition rate, the properties of the thin film can be altered.

Abstract: A recording medium comprises a first layer prepared from a material of perpendicular anisotropy, a second layer prepared from a compound of noncrystalline rare earth metal--3d transition metal and deposited on said first layer, and a transparent protective layer and mounted on said second layer. Data is magnetically recorded on the recording medium and the recorded data is optically read by utilizing the magneto-optics effects.

Abstract: A magnetic recording medium comprises a non-magnetic high-molecular film and at least one magnetic layer containing Co, Ni, Cr and oxygen and formed on the non-magnetic high-molecular film by an oblique incidence vacuum deposition method. The Cr content is within the range of 2 to 8 atom %, the content of oxygen is within the range of 5 to 25 atom %, and the ratio of the number of oxygen atoms to the number of Cr atoms is within the range of 2:1 to 10:1.

Abstract: A magneto-optic memory medium is disclosed which is made up by an acryl resin substrate having strip-like grooves, a magneto-optic magnetization film disposed on the substrate and having an axis of easy magnetization perpendicular to its surface. The magnetization film is made of amorphous ferromagnetic material such as GdTbFe, GdTbDyFe, SmTbFe, GdDyFe, TbCo or the like. A reflective film is provided overlying the magneto-optic magnetization film.

Abstract: A magneto-optic memory medium is disclosed which is made up by an acryl resin substrate having strip-like grooves, a magneto-optic magnetization film disposed on the substrate and having an axis of easy magnetization perpendicular to its surface. The magnetization film is made of amorphous ferromagnetic material such as GdTbFe, GdTbDyFe, SmTbFe, GdDyFe, TbCo or the like. A reflective film is provided overlying the magneto-optic magnetization film.

Abstract: An improved high temperature fatigue resistant coating for nickel and cobalt base superalloys having good oxidation and sulfidation resistance. The coating comprises by weight, 8-30% Co, 8-30% Cr, 5-20% Al, 10-60% Ni and 0.05-1.0% of a reactive metal selected from the group of Y, Sc, La and mixtures thereof, balance selected from the group consisting of Pt, Rh, and mixtures thereof, the (Pt+Rh) content being at least 13%.

Abstract: Manganese coated steel materials having a compact film of hydrated manganese oxide formed on the manganese coating by heating and drying. Manganese coated steel materials of the present invention show very excellent corrosion resistance in ordinary corrosive environments as well as special corrosive environments such as marine environments and young plant cultivation in mountaineous forests. For further improvement of corrosion resistance, organic coating and metal coatings are applied.

Abstract: A thermostat metal characterized by low cost has a substantially linear temperature response over a wide temperature range from 0.degree. to 800.degree. F. and is adapted for wide use for temperature control purposes in a whole variety of electrical cooking appliances, particularly when used in combination with integral but thermally-inactive support means for the thermostat metal. The thermostat metal comprises a layer of metal of relatively high coefficient of thermal expansion having a nominal composition by weight of 72 percent manganese, 18 percent copper and 10 percent nickel metallurgically bonded to a layer of metal of relatively lower coefficient of thermal expansion comprising 430 Stainless Steel, whereby the bimetal material displays a sufficiently high and linear flexivity over a wide temperature range to be useful in the various different types of thermostats used in cooking appliances.

Abstract: The surface of manganese alloys is protected from corrosion by directly exchanging the manganese on the surface of the alloy with a more noble metal, such as nickel, by intrinsic voltaic couple deposition. The invention finds particular utility in protecting manganese alloys from corrosion when used as a thermostat metal.

Abstract: A surface treatment for a class of metallic articles is described. The treatment involves the melting of a thin surface layer of the article by a concentrated energy source, within a narrow set of parameters. The melting step is performed in a manner which maximizes the temperature gradient between the melted and unmelted portion of the article, consequently, cooling and solidification upon the removal of the energy source is extremely rapid and can produce unique microstructures. The preferred energy source is a continuous wave laser, and in the preferred embodiment, a flowing inert gas cover is used to minimize melt contamination and plasma formation. The technique may be used to produce amorphous surface layers in a specific class of eutectic alloys. In another class of alloys, based on the transition metals and containing precipitates rich in one or more metalloids, uniquely fine microstructures may be produced.