Abstract: It is disclosed a method for preparing a large-sized powder metallurgical sintered product having a superior characteristic by charging mixtures of three types of metallic powder composed of coarse particles, middle particles and fine particles into the molding die while vibrating it, heating the charged material together with the molding die, sintering them, and infiltrating metal of low melting point into the sintered body. According to this method, it is possible to get a large-sized sintered body having a superior strength and surface smoothness or a sintered body prohibiting any cracks or slits by arranging the proper particle size.

Abstract: A hard metal composite is formed from a mixture of two or more pre-blended, unsintered hard metal composites in which the properties of each constituent are different. The constituent components are selected so that they have different grain sizes, different binder contents, different metal carbide or binders, or some combination of these. Primarily, the constituents are chosen on the basis of their properties and compatability, and are chosen to utilize the superior properties of one of the constituents without detrimentally affecting the desirable properties of the other. As an example, a pre-blended composite having a superior hardness may be dispersed in a second composite having a superior toughness with the resultant material having a hardness which approaches that of the harder constituent yet maintaining the toughness of the matrix constituent.

Abstract: Provided herein are high-strength high-toughness sintered alloy steel and composite alloy steel powder useful for the production thereof. The sintered alloy steel contains, as the alloy components in the final product, Ni, Mo, and/or W, and C, if necessary, said alloy being composed of 0.50-3.50 wt % of Ni, 0.65-3.50 wt % of Mo+1/2W, (and 0.3-0.8 wt % of C, if necessary), and the remainder of Fe and inevitable impurities, and has a density higher than 7.0 g/cm.sup.3 and a tensile strength higher than 130 kgf/mm.sup.2 after quenching and tempering. The composite alloy steel powder is composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, with the content of Ni and the content of Mo+1/2W in the steel powder of particle diameter smaller than 45 .infin.m being in the range of 2.0-4.2 times the average content in the entire steel powder.

Abstract: The occurrence of porosity in hardfacing deposits produced by plasma transferred arc welding is significantly reduced by blending a porosity reducing agent preferably aluminum and/or manganese, with the hardfacing powder.

Abstract: A zinc base powder for alkaline batteries consists of 0.05 to 3% of mercury, 0.003 to 0.2% of bismuth, 0.01 to 0.08% of lead, the rest being zinc. This powder has an excellent resistance to corrosion in alkaline medium.

Abstract: Metal powder agglomerates of individual particles comprising (i) more than 70% by weight of one or more metals selected from the group consisting of the elements molybdenum, rhenium and tungsten and (ii) one or more binder metals selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, palladium, platinum, rhodium, chromium and rhenium, wherein the individual particles have grain sizes of less than 2 .mu.m and all the metal particles lie side by side in uniform random distribution are useful as the powder required for producing shaped, sintered articles in a powder metallurgical preparation.

Abstract: A silicon-free metal powder mixture suitable for filling holes, slots and widegap joints in high temperature superalloys and/or for reforming damaged or missing surface extensions thereof, and capable of being processed at a temperature of about 2000.degree. F. The semi-solid metal mixture has a sufficiently high surface tension and viscosity to be essentially non-flowing at the processing temperature so that it retains its applied shape and location without flowing during processing. The metal mixture after processing has a solidus temperature of at least 1950.degree. F.

Abstract: A process for the production of a secondary powder composition having a nanocrystalline structure and being comprised of binary or quasi-binary substances composed of at least one of the elements Y, Ti, Zr, Hf, Nb, Mo, Ta and W and at least one of the elements V, Cr, Mn, Fe, Co, Ni, Cu and Pd, optionally also containing further ingredients, such as Si, Ge, B and/or oxides, nitrides, borides, carbides, and their possible mixed crystals. The components are in powdered form and are mixed in elementary form or as pre-alloys and have particle sizes ranging from 2 to 250 .mu.m. The powder components are subjected to high mechanical forces in order to produce secondary powders having a nanocrystalline structure. The secondary powders obtained in this way can be processed into molded bodies according to known compression molding processes, but at a temperature below the recrystallization temperature.

Abstract: A solder paste mixture for soldering surface mount devices to a circuit board using a reflow soldering process which utilize a vapor phase furnace. The solder paste mixture has a metallic content which is 63% tin and 37% lead. The metallic content of the paste consists of 150 micron particles of 100% tin and 150 micron particles of an alloy of 10% tin and 90% lead. Included in the process of soldering components to the circuit board is the step of prebaking the circuit board with solder paste and components in their proper place on the board.

Abstract: A solder composition having a low melting point and a high remelting point sufficient to permit electronic circuit elements to be fixed on a printed circuit board at a low soldering temperature to prevent thermal damage of the electronic circuit elements during the mounting and prevent the elements from dropping off from the board due to any heat applied thereto after soldering. The solder composition includes a low melting solder powder containing a metal additive for melting-point depression, and a reactive alloy powder. The low melting solder powder is melted to form a soldering layer which serves to mount electronic circuit elements on a printed circuit board at a relatively low soldering temperature. At the soldering temperature, the metal additive is reacted with the reactive alloy powder to cause the soldering layer to have a remelting temperature higher than a melting point of the solder composition or solder powder.

Abstract: 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.

Abstract: Metallic coated particles are disclosed which comprise a core consisting essentially of a material selected from the group consisting of metals, metal alloys, ceramics, ceramic glasses, and a coating relatively uniformly distributed on the core. The coating consists essentially of a relatively ductile and/or malleable metallic material selected from the group consisting of metals and metal alloys. The process for producing the coated particles involves increasing the aspect ratio of the ductile and/or malleable material, and mechanically applying it to a powder material which is to be the core of the particles.

Abstract: A dental material of a metal composition for reinforcing the metal framework of a dental restoration comprising an aggregate combination of metal particles including a first high fusing temperature precious metal component and a second low fusing temperature precious metal component. The particles of the first component are in a proportion of 1-15% by volume of the total composition and have a particle size at least about five times larger than the particle size of the second component.

Abstract: Disclosed is a composite metal powder made from a base iron powder milled with an alloying component such as nickel, copper, managnese, chromium, silicon, phosphorus, boron, vanadium, and molybdenum, where the composite metal powder has a compressibility comparable to the compressibility of the soft base iron powder prior to milling. Such a composite is obtained by using a short mill time followed by an annealing step.

Abstract: Inorganic adhesives suitable for bonding metals to metals, metals to ceramics, or ceramics to ceramics with high bonding strength are disclosed, which contain a composite mechanical alloy powder comprising:(a) from about 10 to 60 wt % of particles of at least one of Cu and Ni;(b) from about 10 to 80 wt % of particles of at least one of Ti, Nb, and Zr; and(c) from about 10 to 80 wt % of Ag particles.The composite powder can be dispersed in an organic solvent to form a paste adhesive.

Abstract: Electromagnetic energy shielding material in forms such as form stable gaskets, caulking compounds, coatings, adhesives, etc., the material being composed of a plastic binder and electrically conductive particles having an aluminum core, a first metallic layer thereover e.g., of tin and a silver outer layer.

Abstract: A solder paste mixture for soldering surface mount devices to a circuit board using a reflow soldering process which utilizes a vapor phase furnace. The solder paste mixture has a metallic content which is 63% tin and 37% lead. The metallic content of the paste consists of 150 micron particles of 100% tin and 150 micron particles of an alloy of 10% tin and 90% lead. Included in the process of soldering components to the circuit board is the step of prebaking the circuit board with solder paste and components in their proper place on the board.

Abstract: A dental amalgam alloy containing selenium includes one or two or more of powders of chemically synthesized copper selenides (CuSe, Cu.sub.2 Se), silver selenide (Ag.sub.2 Se), gold selenide (Au.sub.2 Se.sub.3), nickel selenide (NiSe), palladium selenides (PdSe, PdSe.sub.2), platinum selenides (PtSe.sub.2, PtSe.sub.3), zinc selenide (ZnSe), mercury selenide (HgSe), indium selenide (In.sub.2 Se.sub.3) and tin selenide (SnSe) added to and mixed with a dental amalgam alloy powder with the resulting powder mixture containing selenium regulated to an amount of 0.05 to 5 weight %.

Abstract: Sinter alloys based on high-speed steel are proposed, which can be used for producing wearing parts in machinery and vehicle contruction. The sinter alloys comprise a mixture of a powder of a high-speed steel and an unalloyed or a low-alloy iron powder. While the high-speed steel powder forms liquid phases upon sintering, the mixture components can be drawn from either the group of iron alloys that do not form liquid phases or the group of iron alloys that do form liquid phases. The proposed alloys cannot be sintered to the density of the high-speed steels, nor do they quite attain the strength values of such steels, but in the cases where these limit values for strength are not critical they have the decisive advantage that they can be sintered without deformation in standard protective gas furnaces lacking extreme temperature constancy and that they furthermore exhibit only very slight shrinkage.

Abstract: Permanent magnets are prepared by a method comprising mixing a particulate rare earth-iron-boron alloy with particulate aluminum, aligning the magnetic domains of the mixture, compacting the aligned mixture to form a shape, and sintering the compacted shape.

Abstract: A solder paste comprises a solder paste portion containing powdered solder and metallic spheres which are made of a material having a higher melting point than the solder paste portion and whose surface can be wet by molten solder. The metallic spheres have a diameter of 0.07-0.3 mm. The metallic spheres can comprise a single metal or two metals, one of which forms the center of the sphere and the second of which is plated on the surface of the first.

Abstract: Loose metal particles, or a consolidated metal particle composition, of an aluminum alloy consisting essentially of about 5 to 13% zinc, 1 to 3.5% magnesium, 0.5 to 3.0% copper, with iron being present up to 0.5%, with silicon being present up to 0.4%, plus nickel or cobalt or both being present in an amount effective essentially to place the iron in the incoherent dispersoid Al.sub.9 (Fe,M).sub.2, M being nickel or cobalt or both, M being present up to 0.75%, plus means being present for forming coherent dispersoids, said means being present up to 1%, balance aluminum.

Abstract: A thermal spray material has been developed that includes a composite powder comprising chromium carbide or chromium boride and copper or copper alloy in the form of kernels of the chromium carbide or boride clad with the copper or copper alloy. Preferably the thermal spray material includes a self-fluxing alloy composition.

Abstract: A process for forming a metallic alloy having improved material strength and resistance to wear and impact includes precarburizing master alloys to form fine metallic carbides dispersed in a metallic matrix. The metallic carbides are added as precarburized master alloys to a melt and are dissolved to provide a homogeneous distribution of stable carbide particles in the metallic matrix.

Abstract: The invention provides a grain refinement method for copper-based metals, which method can be applied to a range of different types of such metals.

Abstract: A feedstock, for the production of stainless steel injection molded parts, capable of producing high theoretical density using lower than conventional sintering temperatures. In the production of powder metal parts, densities approaching theoretical density are normally achieved by the use of high compaction pressures, high temperature sintering, or a combination of both. By employing a higher chromium content and a lower nickel content than conventional 316L stainless steel, a duplex structure of ferrite and austenite will be produced with superior sintering capability--resulting in higher densification and better mechanical properties at lower sintering temperatures.

Abstract: A fritless copper conductor composition suitable for overprinting on copper consisting essentially of (a) 10-50% wt. finely divided copper particles, (b) 90-50% wt. coarse copper particles, (c) 0.2-2% wt. reducible heavy metal oxide, (d) 0-1.0% refractory metal and (e) 0-5.0% of a high surface area noble metal, all the particles being dispersed in an organic medium.

Abstract: The present invention provides improved spray micropellets having a particle size of 5-150 .mu.m mainly composed of micropellets of high carbon ferrochrome alloy fine powder having an average particle of 0.5-20 .mu.m, mainly containing Cr 20-80 wt. %, Fe 15-75 wt. %, C 5-10 wt. %, Si less than 10 wt. % and Ti and Mn as unavoidable impurities.The spray micropellets are particularly useful for sliding parts having high sealing effects such as pistons and the like.

Abstract: In order to obtain, in a hard alloy based on a nickel-chromium-boron-silicon alloy, particularly advantageous properties with regard to hardness and toughness, carbides of the elements vanadium, niobium, tantalum and/or chromium are added to the hard alloy.

Abstract: By the present invention a dental alloy mixture is provided that is a combination of 20 to 70 percent by weight of cut alloy comprising silver, tin, and copper, with the copper present in an amount of 0 to 30 percent by weight of the cut alloy; and 30 to 80 percent by weight of spherical alloy comprising silver and cooper.

Abstract: Corrosion resistance of stainless steel powder moldings is improved by combining the powder before molding with about 8 to 16% by weight of an additive consisting essentially of about 2 to 30% by weight of tin and 98 to 70% by weight of copper and/or nickel. Stainless steel moldings are prepared by compacting the powder at high pressure and heating to sintering temperature.

Abstract: As the raw material of a ferrous sintered alloy, a ferrous composite powder excellent in both compressibility and distribution of alloying elements is obtained by mixing an iron powder or a Sn-free low-alloy iron powder with at least one secondary powder comprising at least one of C, Co, Cr, Cu, Mn, Mo, Ni, P and Si and another powder comprising Sn and heating the powder mixture in a nonoxidizing atmosphere at 250.degree.-900.degree. C. to result in that the secondary powder(s) is at least partially bonded to the iron particles with Sn as a sort of cementing medium. In the powder mixture the content of Sn is 0.1-20 wt %, and the weight ratio of the secondary powder(s) to Sn is not greater than 50:1. Also disclosed is a ferrous sintered magnetic material high in magnetic flux density and small in iron loss, which contains 1-12 wt % of Si, 0.05-7 wt % of Sn and, optionally, 0.05-2 wt % of P and in which Sn concentrates on the surfaces of iron particles.

Abstract: A fine amorphous metallurgical powder suitable for compacting and sintering into amorphous densified articles which consist essentially of a major portion by weight a transition metal or combination thereof and less than a minor amount of an additional component for enhancing the amorphous characteristics of densified articles produced by directing a stream of molten droplets at a repellent surface to produce the smooth surfaced and melt solidified particles having an average particle size of less than about ten micrometers.

Abstract: Powder metal compositions of nickel, molybdenum, boron, carbon, phosphorus and iron which exhibit low shrinkage on sintering.

Abstract: Compositions for the production of rare earth-ferromagnetic metal permanent magnets comprise mixtures of rare earth-ferromagnetic metal alloy powder and a lesser amount of a powdered second-phase sintering aid, wherein there is added up to about 2 percent by weight of a particulate refractory oxide, carbide, or nitride additive. Permanent magnets are prepared by mixing the components, aligning the mixture in a magnetic field, pressing and sintering. The refractory material inhibits grain growth in the second phase during sintering, improving the magnetic properties of the major phase.

Abstract: A process for the production of valve seat rings by powder metallurgy wherein molybdenum disulfide in the range of about 0.5% to 1.5% by weight is added to a powder mixture containing 0.8% to 1.5% by weight graphite, 1.0% to 4% by weight lead, 0.5% to 5% by weight nickel, 1.2% to 1.8% by weight molybdenum, 9.6% to 14.4% by weight cobalt, and the remainder iron. The resulting powder mixture is pressed into valve seat rings at a pressing force between 40 and 60 and preferably 50 KN/cm.sup.2. The rings are then sintered in a neutral atmosphere at a temperature of 1100.degree. C. to 1200.degree. C., finally compressed at a pressing force above 120 KN/cm.sup.2 and heat-treated if required. The resulting valve seat rings have greatly improved wear properties when used in internal combustion engines using lead-free gasoline.

Abstract: A process for the production of depleted uranium metal particles comprising heating depleted uranium metal to red heat, rapidly chilling the heated metal, grinding the resulting brittlized metal to form powder size particles, annealing the particles and coating the particles with silver, copper, or lead, wherein the grinding and annealing are carried out in an inert argon atmosphere. The invention also contemplates the resulting depleted uranium metal powder, compositions containing the same as well as the liners for shaped charges formed therefrom.

Abstract: A porous, metallurgically bonded, heat-ballasted hydridable mixture in pellet form wherein the solid ingredients comprise about 40 vol. % or less of a hydridable metal or alloy and about 60 vol. % or more of a ballast metal powder from the group consisting of nickel, copper, iron and aluminum.

Abstract: The aforementioned invention comprises an iron based powder mixture with up to 8% silicon, addition of which is in the form of ferrosilicon with a silicon content of approximately 50% and a particle size mainly less than 150 .mu.m.

Abstract: A method of producing fine particles with a particle size of submicron or finer which comprises the steps of:forming closely fine projections on a substrate surface, preferably by sputter-etching using an ionized gas; and thensputtering metallic or non-metallic materials onto the thus treated substrate in an inert gas or a mixed gas of an inert gas and a reactive gas, such as oxygen, the gas pressure of the inert gas or the mixed gas being in the range of from 1.times.10.sup.-4 torr to 1.times.10.sup.-1 torr, and thereby depositing the purposed fine particles in crystalline or amorphous form. The invention method can successfully provide fine particles with desired properties, for example, in size, shape and structure, by adjusting producing conditions or selection of substrate materials and the thus obtained fine particles are very useful in various applications with or without the substrate.

Abstract: A thermal spray composite is disclosed, comprised of a base constituent formed from at least one of the metals nickel, iron, cobalt and chromium, plus additional constituents comprising aluminum and yttrium oxide. Optionally, the base constituent additionally contains aluminum, and the additional constituents may further include molybdenum and/or cobalt. In a preferred form, the composite is a powder having an alloy core of the base constituent, the core having fine particles of the additional elements secured thereto with a binder. The process of thermal spraying the composite is also disclosed, and the resulting coatings have a high degree of high temperature corrosion resistance and tenacity compared to prior art thermal sprayed coatings.

Abstract: A thermal spray composite is disclosed, comprised of a base constituent formed from at least one of the base metals nickel, iron and cobalt, and at least one of the modifying elements chromium and aluminum, plus individual constituents aluminum, cobalt and, optionally, molybdenum. In a preferred form, the composite is a powder having an alloy core of the base metal and the modifying element, the core having fine particles of the individual elements secured thereto with a binder. The process of thermal spraying the composite is also disclosed, and the resulting coatings have a high degree of high temperature corrosion resistance and tenacity compared to prior art thermal sprayed coatings.

Abstract: The invention relates to an improvement of the flowability and an increase in the bulk density of high-surface area valve metal powders by means of the addition of finely divided extraneous metal oxides in quantities of up to 5000 ppm, relative to the quantity of metal, before the powder-metallurgical processing of the valve metal powder.

Abstract: An alloy steel powder for high strength sintered parts consisting essentially of 0.4-1.3% by weight of Ni, 0.2-0.5% by weight of Cu, the total amount of Ni and Cu being 0.6-1.5% by weight, 0.1-0.3% by weight of Mo and the remainder being not more than 0.02% by weight of C, not more than 0.1% by weight of Si, not more than 0.3% by weight of Mn and not more than 0.01% by weight of N respectively in the incidental mixed amount and substantially Fe. The alloy steel powder may be a mixture of the alloy steel powder with ferro-phosphorus powder in an amount of phosphorus in the total fixed powder of 0.05-0.6% by weight.

Abstract: A tin alloy powder containing up to 5% P is disclosed. Reduced sensitivity to sintering conditions is achieved by use of present alloy powder in production of sintered bronze articles. Means for controlling the growth of the article during sintering are also disclosed.

Abstract: The invention relates to cylinder liners for internal combustion engines comprising a matrix based on aluminum alloys of high mechanical strength, obtained by powder metallurgy, and methods of producing them. The liners comprise a dispersion of grains of an added intermetallic compound, apart from the dispersion of such intermetallic compounds as may exist in the alloy, the added compound having a melting temperature of over 700.degree. C. The liners are obtained by extruding or sintering a mixture of powders. The liners of the invention may be used particularly in the automobile industry and in any kind of industry where liner-piston units of good compatibility must be obtained from aluminum alloys.

Abstract: Selenium-containing amalgam alloys for dental restoration comprises 0.1-50% by weight of any one of the following alloy powders (A), (B) and (C) mixed with 50-99.9% by weight of the following amalgam alloy powders (D).(A): Silver alloy powders containing no less than 50% by weight of silver and 0.01-10% by weight of selenium,(B): Copper alloy powders containing no less than 50% by weight of copper and 0.01-5% by weight of selenium,(C): Alloy powders mix of (A) with (B) wherein the total amount of silver and copper is adjusted to no less than 50% by weight, and the amount of selenium to 0.01-10% by weight, and(D): Silver-tin-copper amalgam alloy powders. At least one of the any one of (A), (B) and (C) and (D) may be pre-amalgamated with mercury in an amount of no higher than 3% by weight based on the total weight thereof.

Abstract: A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

Abstract: Electromagnetic energy shielding material in forms such as form stable gaskets, caulking compounds, coatings, adhesives, etc., the material being composed of a plastic binder and electrically conductive particles having an aluminum core, a first metallic layer thereover e.g., of tin and a silver outer layer.

Abstract: Tantalum powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 400 ppm based on elemental phosphorus. In one embodiment, the flow properties of the powder are also improved.