Abstract: A metal article is consolidated from a rapidly solidified magnesium based alloy. After consolidation, the alloy has a microstructure containing precipitates of intermetallic phase of average size less than 0.1 .mu.m. The article has a thickness of at least 1 mm measured in the shortest dimension, and exhibits a superior combination of strength, ductility and corrosion resistance.

Abstract: Tools for machining etc can according to the invention be made better and cheaper by being composed of a compound material forming core and cover resp of the tool. The core consists thereby of a material which is situated in the gap between cemented carbide and high speed steel regarding its properties and which contains 30-70 vol % hard constituents in the form of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and/or W in a matrix based on Fe, Ni, and/or Co and that the cover comprises an alloy based on Fe, Co and/or Ni generally steel and preferably tool steel or stainless steel.

Abstract: Disclosed is a nickel-base alloy eminently suited for use as a welding filler material. The alloy contains over 40% molybdenum with an effective content of silicon to provide a valuable combination of engineering properties which includes the combination of high strength, excellent corrosion resistance and welding characteristics. Commercial production of the alloy may be in many forms, for example, castings, powder metallurgy articles, wrought products and the like. A typical alloy of this invention contains about 42% molybdenum, 0.25% silicon and the balance nickel plus modifying elements and impurities.

Abstract: Silicon carbide particles are produced by reacting a gaseous silicon compound or granular silicon with a carbon compound at a high temperature. In the reaction, the amount of free carbon content in the resultant silicon carbide particles can be controlled by monitoring the amount of unsaturated hydrocarbon such as acetylene, as a by-product. Moreover, silicon carbide particles can contain boron dispersed uniformly in the particles by a two step process comprising first reacting a silicon source and a boron source without a carbon source in a first reaction zone, to form boron-containing silicon particles, and second, reacting the resultant particles with a carbon source in a second reaction zone.

Abstract: A carbide-dispersed type Fe-base sintered alloy which has excellent wear resistance and consists essentially of: 4-6.5% by weight C; 10-40% by weight Cr; 2-25% by weight Mo; 0.1-5% by weight at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, and Ta; and the balance of Fe and inevitable impurities. If required, the alloy may further contain 0.1-15% by weight at least one element selected from the group consisting of Co and Ni, and/or 0.1-10% by weight W. The alloy has a structure wherein carbides are dispersed throughout the matrix in an amount of at least 71% by volume, and the alloy has at least 97% theoretical density ratio.

Abstract: A mixture of two powdered alloys of the M, Cr, Al type, M being Co and/or Ni, is disclosed, in one form, for use in providing an abradable surface of an article and is characterized by the substantial absence of B. The first alloy has substantially no Si and has a higher melting range than that of the second alloy. The second alloy has substantially no Y and consists essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr, with the balance M and incidiental impurities. The total mixture composition consists essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities.

Abstract: A wear-resistant sintered iron-based alloy and a process for producing the alloy are described, wherein the alloy comprises a first phase having a martensite composition which comprises from 0.5 to 3.0 wt % of Cr, from 0.4 to 1.0 wt % of Mn, from 0.1 to 0.4 wt % of Mo, and the balance of Fe, based on the total amount of said first phase; a second phase having a martensite and Cr carbide composition which comprises from 10 to 20 wt % of Cr and the balance of Fe, based on the total amount of said second phase; and from 1.0 to 2.5 wt % of C, based on the total amount of said alloy; wherein said first phase and said second phase are present as a mixture containing from 10 to 80% by volume of said second phase, based on the total volume of said alloy; and said alloy is substantially free from any residual austenite.

Abstract: A powder metallurgy produced high speed tool steel article comprising a mixture of prealloyed high speed tool steel particles coated with a hard, wear resistant material, such as a carbide or nitride, mixed with prealloyed high speed tool steel uncoated particles; the particles are compacted to essentially full density and the hard, wear resistant material is at the boundaries of the coated particles and contained in a continuous matrix of the high speed tool steel. The article is produced by hot compacting a particle charge to essentially full density of a mixture of the coated and uncoated particles.

Abstract: An Fe-base sintered alloy for valve seats for use in internal combustion engines and a method of manufacturing the same are provided. The alloy consists essentially of 0.6 to 1.3% C, 1 to 5% Cr, 4 to 15% Mo, 0.5 to 2% Ni, 2 to 8% Co, 0.2 to 2% Nb, 0.2 to 2% at least one lubricating component selected from the group consisting of a CaF.sub.2 and BaF.sub.2 and the balance of Fe and inevitable impurities. Starting powders are blended into the same composition as above, and mixed into a mixed powder. The mixed powder is pressed into a green compact. Then, the green compact is presintered, hot forged, sintered, and, if required, further heat treated, in sequence to be formed into an Fe-base sintered alloy having a structure wherein particles of the at least one lubricating component and hard particles of other components are dispersed in a matrix formed principally of a pearlite phase. The resulting alloy possesses a density of at least 7.3 g/cm.sup.

Abstract: Disclosed is a mixture of about 55% to about 90% by volume powdered niobium alloy and about 10% to about 45% by volume powdered intermetallic compound selected from the group consisting of NbAl.sub.3, NbFe.sub.2, NbCo.sub.2, NbCr.sub.2, and mixtures thereof. The mixture is mechanically alloyed to intermix the intermetallic compound with the particles of the niobium alloy. A shape is made by consolidating the mechanically alloyed powder.

Abstract: A high temperature-resistant aluminum alloy is disclosed, comprising an aluminum matrix containing a dispersion mixture of reinforcing aluminum-iron particles with 2-16% nickel and/or cobalt, 1-6% copper and 1-3% manganese. The weight ratio of the copper to manganese is between about 2:1 and 1:1, and the intermetallic phases of the type AlCuMn, Al.sub.3 Ni and/or Al.sub.9 Co.sub.2 are present in spherical forms.

Abstract: Silicon carbide particles are produced by reacting a gaseous silicon compound or granular silicon with a carbon compound at a high temperature. In the reaction, the amount of free carbon content in the resultant silicon carbide particles can be controlled by monitoring the amount of unsaturated hydrocarbon such as acetylene, as a by-product. Moreover, silicon carbide particles can contain boron dispersed uniformly in the particles by a two step process comprising first reacting a silicon source and a boron source without a carbon source in a first reaction zone, to form boron-containing silicon particles, and second, reacting the resultant particles with a carbon source in a second reaction zone.

Abstract: A composition for fixing a metal powder molding at sintering, which is used, in the case of disposing a metal powder molding formed by rolling a mixture of a metal powder and a synthetic resin-based binder on a metal base material and sintering the metal powder molding in a non-oxidizing atmosphere, to adhere and fix the metal powder molding onto the base material until the metal powder molding is sintered interposing between the metal powder molding and the base material, comprising a polyimide liquid composition containing a polyimide precursor and an organic solvent as the essential components.

Abstract: Diffusion aluminizing with chromium or silver chloride, bromide or iodide that is not significantly soluble in or reactive with water. Hydrogen can be excluded from diffusion aluminizing atmosphere when aluminizing maraging steels or other substrates sensitive to hydrogen. Aluminized iron powders can be boronized to increase their exothermic heat upon exposure to air after leaching out aluminum.

Abstract: A cemented carbide cutting tool substrate has enhanced surface toughness due to binder enrichment and depletion of aluminum nitride near the peripheral surface.

Abstract: Herein is disclosed a high hardness sintered diamond compact and a process for the production of the same.The high hardness sintered diamond compact comprises 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (Mo,W)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron.The ratio by volume of the amount of the diamond particles having a diameter from 1 to 2 micron to that of the diamond particles having a diameter from 0.1 to 1 micron ranges from 4 to 1.The high hardness sintered diamond compact according to the present invention is preferably usable as a drawing die for drawing a high hardness plated-steel wire and as a tool bit.

Abstract: A method for making seamless, porous metal articles comprising:(a) rotating a mold containing a stabilized suspension of a metal particulate at a rate and for a time such that the particulate is separated from the suspension and distributed on the interior wall of the mold, thereby forming a structure conforming to the interior wall of the mold, the rate of rotation being sufficiently high that, preferably, at least about 65 Gs up to 100 Gs of centrifugal acceleration is achieved at the interior wall of the structure,(b) drying the formed structure to provide a structure having green or unsintered strength, and(c) sintering the dried structure to remove volatile material and fuse the individual particles of the particulate to each other to form the seamless, porous metal article.Metal articles in accordance with the invention have substantially uniform diameters, thicknesses and pore structurs, have Bubble Point ratios of greater than 1.5 up to 2.5, and find particular use as filters.

Abstract: There is described a coating providing an anti-oxidant barrier for carbon based material against oxidation at high temperature (temperature higher than 500.degree. C.), more particularly for graphite electrodes used in electric arc furnaces. The coating comprises at least a first layer of metallic titanium or titanium alloy which is applied directly on the carbon-based material, e.g. graphite, and a second layer which comprises a mixture of silicon carbide and aluminum alloy, the second layer being applied on the first layer. This coating substantially extends the life of the carbon-based material. There is also disclosed a method of producing this coating by applying the two layers onto a carbon-based material such as graphite.

Abstract: The invention is a method of predicting ductility of a metallic cast eutectic alloy; the discovery of a microstructural function based upon manufacturing steps that influence ductility; and including the microstructural characteristics of the number of cells of a primary metal of the alloy such as aluminum in an aluminum silicon magnesium alloy, the silicon eutectic, and the lack of soundness, i.e., porosity; and the discovery of a ductility prediction equation.

Abstract: A process for making titanium nitride powder by reaction of titanium phosphates with sodium cyanide.