Abstract: A method of making a silicon alloy, and preferably a ferrosilicon alloy, having a controlled calcium content and optionally rare earth constituents wherein the calcium and rare earth constituents are separately introduced into the ferrosilicon smelting furnace in briquette form. The calcium briquettes comprise a compressed and cured mixture of calcium carbonate, preferably in the form of pulverized limestone, a carbon source, such as carbon black, and a binder. The briquetted calcium carbonate dissociates as it is heated during its descent in the smelting furnace and transforms to calcium oxide. The resultant calcium oxide reacts with the carbon in the briquette in the high temperature smelting zone to yield calcium carbide which then reacts with silica to form calcium silicide which then enters into solution with the molten ferrosilicon alloy.
Type:
Grant
Filed:
July 26, 1989
Date of Patent:
March 26, 1991
Assignee:
American Alloys, Inc.
Inventors:
Ernest J. Breton, Jan R. Leszcynski, Michael A. Merritt, John O. Staggers
Abstract: Disclosed herein is a multifilament superconducting wire of Nb.sub.3 Al comprising a core part of copper or copper alloy which is provided in a central portion as a stabilizing material and a peripheral part which is provided around the core part and formed by an Nb.sub.3 Al filament embedded in a matrix of copper or copper alloy, such that the ratio of copper or copper alloy forming the core part and the peripheral part to the Nb.sub.3 Al filament is at least 1 and not more than 5 in sectional area ratio and the diameter of the core part is at least 1/5 of the wire diameter.
Abstract: This invention relates to iron-base alloy compositions, nickel containing austenitic ferrous alloy compositions (especially low nickel compositions) and dopants added to low nickel austenitic alloys as a means of improving the elevated temperature oxidation resistance of the resultant material.
Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
Type:
Grant
Filed:
November 27, 1989
Date of Patent:
March 12, 1991
Assignees:
Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
Abstract: A process for the production of a series 7000 aluminum alloy (Al-Zn-Cu-Mg) with a high level of mechanical strength and good ductility, by spray deposition. The object is the production of aluminum alloys having an ultimate stress.gtoreq.800 MPa and an elongation.gtoreq.5%, as well as the production of alloys which are reinforced by ceramic particles. According to the process, a solid alloy is formed by spray deposition, the alloy is transformed in the hot condition at between 300.degree. and 450.degree. C. and possibly in the cold condition, and the transformed alloy is subjected to solution treatment, quenching and aging.
Abstract: A composite metal plated article excellent in mold-releasability, which comprises an article to be plated and a composite metal plating layer, formed on at least one surface of the article to be plated, in which particles of a synthetic resin as a mold-releasing agent are uniformly dispersed. The above-mentioned synthetic resin comprises a modified silicone oil having a structure in which a plurality of repeated units of a fluorine atoms substituted olefin are combined with silicone oil.
Abstract: This invention relates to novel alloys suitable for use in making dental restoration elements, such as crowns, inlays, and the like, and ornamental articles such as jewelry, ornaments and the like. The alloys are based on Pd, In and Ag and contain 25-50% by weight of Pd, 20-45% by weight of In and 20-50% by weight of Ag. The alloys may additionally contain minor proportions of certain other elements, they are castable, and have an esthetic yellow color.
Abstract: Directed to the production of composite copper-molybdenum sheet by assembling at least one plate of molybdenum with at least one plate of dispersion-strengthened copper to form a composite billet, heating the billet in a protective atmosphere to a temperature within the hot working range for copper, working the billet in a protective atmosphere to effect a reduction in thickness of at least about 40% to bond said dispersion-strengthened copper and said molybdenum together and thereafter further working the resulting bonded billet.
Abstract: A method is taught for the in-situ precipitation of second phase materials, such as ceramic or intermetallic particles, in a substantial volume fraction of solvent metal matrix. The invention involves the propagating reaction of the second phase-forming constituents in a solvent metal medium to provide a porous composite of finely-dispersed second phase particles in the metal matrix. Exemplary materials include titanium carbide or titanium diboride in an aluminum matrix.
Type:
Grant
Filed:
August 28, 1989
Date of Patent:
January 15, 1991
Assignee:
Martin Marietta Corporation
Inventors:
William C. Moshier, John M. Brupbacher, Leontios Christodoulou, Dennis C. Nagle
Abstract: The present invention is directed to air-meltable, castable, workable alloys resistant to hot or cold chlorides and variety of chemical streams. The alloys consist essentially of, by weight, between about 20% and about 24% nickel, from about 22% to about 25% chromium, from about 5% to about 7% molybdenum, from about 0.7% to about 3.5% copper, up to about 0.08% carbon, up to about 0.35% nitrogen, up to about 0.8% columbian (niobium), up to about 1.5% manganese, up to about 1% silicon, and the balance essentially iron. Up to about 0.3% cobalt can also be present as an element naturally coexisting in certain ore deposits as a sister element to nickel and considered here to be part of the nickel content. The alloys of the present invention are of single phase austenitic matrices.
Abstract: A multilayer sliding material which is used, in particular, as the material of the bearings in internal combustion engines, comprising a steel backing layer, a bearing layer of copper-based alloy bonded to the steel backing layer, a silver or silver alloy plating layer bonded to the bearing layer, and a surface layer of lead-based alloy bonded to the silver or silver alloy plating layer, the silver or silver alloy plating layer having a thickness of more than 3 microns but not more than 50 microns. The multilayer sliding material having a thick plating layer of silver or silver alloy, excels in seizure-resisting.
Abstract: A method of altering the crystal form of an alloy is disclosed. To accomplish this change in crystal form, the concentrations of the more volatile constituents of the alloy are reduced and the concentration of the less volatile constituents is increased on a relative basis. The process may be carried out in forming a reinforced structure. For this purpose, an improved reinforced matrix and a method of forming it are taught. The reinforcement may be silicon carbide filaments or other reinforcing filaments. The matrix is a titanium 1421 alloy nominally containing 14 weight percent of aluminum and 21 weight percent of niobium. The matrix is formed by plasma-spray forming a powder of the alloy to impart to the alloy particles a superheat during the plasma-spraying as the particles traverse the plasma plume. As a result of the superheat, the alloy is changed in its composition to reduce the aluminum concentration and to increase the niobium and titanium concentrations on a relative basis.
Type:
Grant
Filed:
January 2, 1990
Date of Patent:
December 18, 1990
Assignee:
General Electric Company
Inventors:
Ann M. Ritter, Paul A. Siemers, Donald R. Spriggs
Abstract: Disclosed is a graded metal powder for metallic pigment, comprising a metal powder wherein the metal powder has a mean particle size of from about 2.5 to about 15.0 .mu.m, the content of particles having a particle size of not greater than 1 .mu.m is not larger than about 0.5% by volume, and the metal powder has a particle size distribution such that not smaller than 97% by volume of the particles of the metal powder fall within the range between half the mean particle size of the metal powder and double the mean particle size of the metal powder. Also is disclosed a process for producing a graded metal powder by classifying metal particles dispersed in a mineral oil containing a nonionic-anionic surfactant.
Abstract: Methods for manufacturing compressible and sinterable metal powders are provided by this invention which include contacting core metal particles with a sol of a precursor of a metal. The sol has a viscosity of from about 10-10.sup.5 centipoise and comprises at least 1.0 weight percent of the precursor in a liquid medium. The final coating is produced by removing the liquid from the sol and then converting the precursor to form a substantially uniform layer of a Cu-Ni-Mo alloy on the surfaces of the soft iron or steel core metal particles.
Type:
Grant
Filed:
March 15, 1989
Date of Patent:
December 4, 1990
Assignee:
Hoeganaes Corporation
Inventors:
James R. Johnson, William J. Mueller, David R. Walsh
Abstract: In manufacturing contact materials which satisfy all the criteria required for use in vacuum switches as to chopping current, circuit breaking performance, withstanding voltage, welding separation force and wear, Cu powder and Ta.sub.2 O.sub.5 powder are mixed, and compressed while heating below the melting point of Cu in a nonoxidizing atmosphere. Alternatively a green compact is first manufactured from Ta.sub.2 O.sub.5 powder or a mixture of Ta.sub.2 O.sub.5 and Cu powder, and molten Cu is made to infiltrate into the compact. Preparing a green compact from a mixture of Cu powder and Ta.sub.2 O.sub.5 powder, it may be sintered at a temperature below the melting point of Cu, re-pressed, and resintered at 400.degree.-900.degree. C. in a nonoxidizing atmosphere.
Abstract: Ductile, composite superconductors having a continuous Re-Ba-Cu-O type or Bi-Sr-Ca-Cu-O type phases and a continuous noble metal phase and a process for their preparation are disclosed.
Abstract: A process for controlling the oxygen content in tantalum material comprising heating the material under a hydrogen-containing atmosphere in the presence of a tantalum getter metal having an initial oxygen content lower than the tantalum material.
Abstract: A metal composition comprising zinc oxide whiskers dispersed in a metal matrix. The whiskers comprise at least one needle crystal having a basal part whose diameter is from 0.7 to 14 micrometers and a length from the basal part to its tip of from 3 to 200 micrometers. The metal composition is isotropically reinforced with respect to mechanical strength and is significantly improved in free cuttability.
Type:
Grant
Filed:
August 29, 1989
Date of Patent:
October 2, 1990
Assignee:
Matsushita Electric Industrial Co., Ltd.
Abstract: A heat-resistant, wear-resistant and high-strength Al-Si alloy, wherein(A) 3 to 5% by weight based on the total amount of the alloy of alumina particles having a maximum particle diameter of 30 .mu.m or less and an average particle diameter of 10 .mu.m or less and having shaped with no sharp edge and(B) 0.5 to 3% by weight based on the total amount of the alloy of graphite particles having a maximum particle diameter of 10 .mu.m or less as measured on a cross section of the Al-Si alloy structureare dispersed in a matrix consisting essentially of ingredients for an Al-Si alloy and having primary Si crystals, the sizes of the primary Si crystals being not larger than 10 .mu.m.
Type:
Grant
Filed:
October 31, 1989
Date of Patent:
September 25, 1990
Assignees:
Sumitomo Electric Industries, Ltd., Honda Motor Co., Ltd.
Abstract: Aluminum-molybdenum composite sheet is produced by assembling aluminum and molybdenum sheets to form a billet, rolling the assembled billet in a protective atmosphere at a temperature of about 100.degree. to 400.degree. C. to affect a reduction in thickness of at least about 40% to provide a bonded billet. The billet can be further reduced by hot and/or cold rolling.