Abstract: A metallic coating layer is removed at least partly from scrap metal pieces having a core and the coating layer on the core. The coating layer has a lower melting temperature than the core. The scrap metal pieces are agitated in a container with abrading elements so as to cause multiple collisions, whereby the coating layer is at least partly removed. During the agitating the container temperature is a temperature T in the range Ts(coat)<T<TL(core) wherein Ts(coat) is the solidus temperature of the coating layer and TL(core) is the liquidus temperature of the core. The agitation may be by rotationally tumbling or shaking the scrap metal pieces and the abrading elements.

Abstract: Disclosed is a process for making an oxide dispersion-strengthened tungsten heavy alloy by mechanical alloying that includes the steps of: adding 0.1 to 5 wt. % of Y2O3 powder to a mixed powder comprising more than 90 wt. % of tungsten powder, and nickel and iron powders for the rest; and subjecting the resulting mixture to a mechanical alloying to prepare an oxide dispersion-strengthened tungsten heavy alloy powder. The oxide dispersion-strengthened tungsten heavy alloy prepared by the mechanical alloying is characterized in that fine Y2O3 particles are uniformly dispersed in the matrix which are stable at high temperatures results in enhanced high-temperature strength and a reduction of the shearing strain of the fracture during high-speed shear deformation.

Abstract: An improved method of making submicron cemented carbide bodies include wet milling powders of WC and Co and grain growth inhibitors to a slurry, drying the slurry to a powder, uniaxial pressing of the powder to form bodies of a desired shape, and sintering. WC powder is provided with an FSSS grain size, dwc, of less than 1 &mgr;m and a Co powder with an FSSS grain size, dco, such that the ratio dwc/dco is 0.75-1.5.

Abstract: The invention according to the present application provides a high strength solidification body by solidifying a starting metallic powder of iron and the like by means of plastic working using hydrostatic pressing, which is, for instance, a high strength high toughness steel material and the like having a superfine texture comprising a crystalline texture consisting of grains 5 &mgr;m or less in average diameter, or preferably, 3 &mgr;m or less in average diameter. Furthermore, the present invention provides a steel material included in the high strength solidification body, which contains oxide grain 0.2 &mgr;m or less in diameter at a volume ratio of from 0.5 to 60%.

Abstract: A method of manufacturing a high-density titanium alloy article is disclosed. The method comprises a mixing and granulating step, a high-pressure molding step, and a high-temperature sintering step. Moreover, by means of selecting proper size of titanium raw powder and granulating the titanium raw powder and other metallic powder into titanium-based grains, a titanium alloy article having a high density is obtainable.

Abstract: A metal-matrix diamond or cubic boron nitride composite and method of making the same are disclosed. The metal-matrix/diamond composite includes grains of diamond uniformly distributed in a metal matrix. Alternatively, grains of cubic boron nitride may be used. Suitable metals for the metal matrix material may include nickel, cobalt, iron, and mixtures or alloys thereof. Other transition metals also may be used. The metal-matrix/diamond or metal-matrix/cubic boron nitride composite has high fracture toughness due to its fine microstructure. Such a metal-matrix/diamond or metal-matrix/cubic boron nitride composite is suitable for use in blanks or cutting elements for cutting tools, drill bits, dressing tools, and wear parts. It also may be used to make wire drawing dies.

Abstract: A method is provided for fabricating Cu/Cr sputter targets having a density of at least about 90% of theoretical density and an oxygen content of less than about 1000 ppm. According to the principles of the present invention, Cu and Cr powders, each having particles in the size range of about 20 &mgr;m to about 150 &mgr;m and having oxygen contents preferably less than about 1200 ppm and 600 ppm, respectively, are blended and pressed by hot pressing. A low-oxygen content, high-density Cu/Cr target is thereby achieved for the sputtering of thin films having a defect generation of about 0%.

Abstract: The present invention relates to a method of making a cemented carbide body with a bimodal grain size distribution by powder metallurgical methods including wet mixing, without milling, of WC-powders with different grain size distributions with binder metal and pressing agent, drying, pressing and sintering. The grains of the WC-powders are classified in at least two groups, a group of smaller grains and a group of larger grains. According to the method of the present invention, the grains of the group of smaller grains are precoated with a growth inhibitor with or without binder metal.

Abstract: Improved methods for coating particulate materials at low shear conditions and preferably below the melting point of the coating material are provided. In one aspect, metallurgical compositions are provided that contain a metal-based powder bound to an alloying powder or powders by way of a low melting polymer or wax binding agent, which is preferably polyethylene. The binding agent is blended with the metal-based and alloying powders at elevated temperatures preferably below the melting point of the binding agent. The bonded metallurgical composition can be used in compaction processes to manufacture compacted parts that can be sintered to impart strength.

Abstract: The invention relates to a Cr2O3-forming alloy that is resistant to oxidization and/or corrosion at high temperature, especially by glass, characterized in that it contains, in dispersion within its matrix, chromium oxide Cr2O3, or a precursor of this oxide. This alloy can be prepared by powder metallurgy using a process of hot consolidation of metallic powders, in particular by sintering. The alloy is especially suitable for articles which are to be used in a high-temperature oxidizing or corrosive environment.

Abstract: A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy mill to obtain mechanical alloying effects, then processing the resulting powder product by conventional powder metallurgy to produce an article with bulk density greater than 9.0 g/cc.

Abstract: A method of producing a silicon aluminum sputtering target is provided. The target is formed from a powder base of between about 80% to about 95% by weight silicon and about 5% to about 20% by weight aluminum which is placed in a containment unit, heated under vacuum and then sealed. The base is then subjected to a pressure greater than about 3000 psi and heated to a temperature between about 1076° F. and about 1652° F. such that some, but not more than 30%, of the resulting target is formed from liquid phase silicon-aluminum.

Abstract: The object of the present invention is to provide rare-earth system sintered magnets such as R—Fe—B system or R—Co system having excellent magnetic properties, unique configuration of a small size, thin wall thickness and intricate geometry. With the method for preparing the present invention, a granulation of alloy powders can be achieved easily, a chemical reaction between rare-earth system and binder substances can be suppressed, so that the residual oxygen and carbon levels in the sintered products can be reduced. Moreover, by this production method, the flowability and lubricant capability during the forming process can be improved. The dimension accuracy and productivity are also enhanced. A certain type of binder is added to rare-earth alloy powders and kneaded into a slurry state. The slurry is then formed into granulated powders by spray-dryer equipment. The thus granulated powders are molded, and sintered through a powder metallurgy technique.

Abstract: A method of producing an R--Fe--B-based, sintered permanent magnet, wherein R is at least one rare earth element including Y, having a small oxygen content. A coarse alloy powder prepared by a reductive diffusion method is milled and recovered into a solvent to form a slurry. The slurry is wet-compacted to form a green body which is then sintered after removing the solvent. The milling, recovering, wet-compacting, solvent-removing and sintering steps are carried out while preventing the powder, slurry and green body from being brought into contact with air to minimize the oxygen content in the final sintered permanent magnet. The sintered permanent magnet produced has a high density and a high magnetic properties due to a low oxygen content.

Abstract: A process of forming a multi-phase sintered article of powdered metal comprising: blending a mixture of copper powder, aluminum powder, iron powder, and nickel, each in their free states, with a lubricant, compacting the blended mixture into a die cavity, forming the article, and high temperature sintering the article in a reducing atmosphere comprised of 100% dissociated ammonia so as to produce the multi-phase sintered article of powdered metal; and the multi-phase sintered article of powdered metal formed thereby.

Abstract: A method of making TiC based cermets through a reaction milling process is disclosed. In the method of this invention, a particle mixture, consisting of 50-95 wt. % Ti-C particles, with Ti particles being mixed with C particles at a weight ratio of 4:1, and 5-50 wt. % Ni particles, is reaction-milled in a Spex mill, thus making TiC based particles. A preform is formed of the TiC based particles and is sintered, thus making a TiC based cermet. The Ni particles of the particle mixture may be substituted with Ni-Mo particles. In addition, the method may further comprise the steps of presintering the preform from the forming step, and intermediate-machining the presintered preform prior to finally sintering the preform, thus machining the preform more precisely. The sintering temperature preferably ranges from 1,300.degree. C. to 1,400.degree. C. In the method of this invention, the TiC particles are made through the reaction milling process, thus reducing the production cost while making the TiC based cermets.

Abstract: A method of producing Iron-Silicon high density sintered articles of intricate design comprising: (a) the blending of compressible iron or low-carbon steel powder, silicon alloyed iron or silicon powder, or combination of silicon alloyed iron and silicon powder, and lubricant, (b) cold pressing said blended mixture with pressures of less than 50 tsi to form the structure of said article with the density up to 88% of the theoretical value and with uniformly distributed hard powder consisting of silicon and/or silicon alloyed particles among ductile iron powder, (c) low temperature stress relieving heat treatment of said formed article at the temperature range of 360-800.degree. C. followed by a cooling rate of less than 120.degree. C.

Abstract: A method combining isothermal and high retained strain forging is described for Ni-base superalloys, particularly those which comprise a mixture of .gamma. and .gamma.' phases, and most particularly those which contain at least about 40 percent by volume of .gamma.'. The method permits the manufacture of forged articles having a fine grain size in the range of 20 .mu.m or less. The method comprises the selection of a fine-grained forging preform formed from a Ni-base superalloy, isothermal forging to develop the shape of the forged article, subsolvus forging to impart a sufficient level of retained strain to the forged article to promote subsequent recrystallization and avoid critical grain growth, and annealing to recrystallize the microstructure. The method permits the forging of relatively complex shapes and avoids the problem of critical grain growth. The method may also be used to produce location specific grain sizes and phase distributions within the forged article.

Abstract: A description is given of a method of manufacturing a permanent magnet on the basis of NdFeB. In this method a powder of NdFeB and a powder of a Ga alloy, consisting mainly of Ga and one or more than one rare earth metals (RE), is mixed to form a mixture which is subsequently aligned, compressed and sintered. Such alloys can be ground into homogeneous, fine-grain powders in a simple manner. The composition of the alloy preferably corresponds to the formula REGa.sub.x, where x=1 or x=2. Alloys which are very suitable contain Dy and/or Tb as the rare earth metal.

Abstract: A high performance, high density sputtering target and a method of making. An aluminum and non-aluminum reactive metal powder blend is subjected to cold pressing under pressure, machining, evacuating, and hot pressing under pressure. The aluminum and non-aluminum metal react directly to yield a high performance, high density sputter target containing greater than about 2% aluminum with substantially uniform composition across the body.

Abstract: Disclosed is a method for the preparation of a novel composite rare earth-based magnetically anisotropic sintered permanent magnet in which: (a) a base alloy consisting of a host phase of R.sub.2 T.sub.14 B (R: a rare earth element; T: iron or a combination of iron and cobalt) having a particle diameter of 2 to 10 .mu.m and containing in each particle a phase rich in the content of T and having a particle diameter not exceeding 1 .mu.m is prepared by the strip casting method; (b) the base alloy is crushed; (c) the base alloy powder is blended in a specified proportion with a powder of an auxiliary alloy of R-T or R-T-B in a specified proportion; (d) the powder blend is subjected to further comminution; (e) the comminuted powder blend is subjected to compression-molding in a magnetic field into a powder compact; and (f) the powder compact is sintered by a heat treatment.

Abstract: A pressable powder is formed by a method comprising mixing, in essentially deoxygenated water, a first powder selected from the group consisting of a transition metal carbide and transition metal with an additional component selected from the group consisting of (i) a second powder comprised of a transition metal carbide, transition metal or mixture thereof; (ii) an organic binder and (iii) combination thereof and drying the mixed mixture to form the pressable powder, wherein the second powder is chemically different than the first powder. The pressable powder may then be formed into a shaped part and subsequently densified into a densified part, such as a cemented tungsten carbide.

Abstract: A fabrication method for a molybdenum disilicide sintered body in which a molybdenum disilicide powder having excellent oxidation resistance is sintered in a low-temperature sintering method and compacted at a low temperature and under no pressure, includes carrying out a milling on a molybdenum disilicide powder at a low temperature, providing a diffusion path required to sinter the molybdenum disilicide on which a milling is performed, and sintering the resultant powder under the atmosphere of hydrogen or argon gas.

Abstract: There is now provided a roll for hot rolling comprising 70-95 weight %, preferably 85-94 weight %, WC in a binder phase consisting of only cobalt or alternatively a Co--Ni--Cr alloy containing 20-35 weight % Ni and up to 10 weight % Cr, possibly with small additions of molybdenum. The WC grains are rounded with an average grain size between 3-10 .mu.m, preferably 4-8 .mu.m. The maximum grain size should not exceed 2 times the average grain size and no more than 2% of the grains be less than half of the average grain size.

Abstract: A single phase W-Ti sputter target and a method of manufacturing the target are disclosed. The target is produced by mixing powders of tungsten and titanium and subjecting the mixed powders to a pressing operation for a time, temperature and pressure sufficient to achieve a mutual solid solution of W and Ti, forming single .beta.(Ti,W) phase. The single phase sputtering target emits much less particulate during sputtering than conventional multiphase W-Ti targets of comparable density and composition.

Abstract: A mechanochemical process for producing fine WC/Co composite powder which is so small in WC grain size and in mean free path, and contains such a uniform distribution of WC and Co that its hard metal is superior in strength, compressive strength, TRS and wear resistance and considerably free of impurities. The method comprises the steps of drying an ammonium metatungstate--Co(NO.sub.3).sub.2 solution in a spray dry manner to give initial powder of porous spheroids or in a common manner to give a cake of initial powder, removing the salts and humidity from the initial powder by a thermal treatment, mixing and milling the desalted initial powder with carbon black, and subjecting the mixed powder to reduction/carburization in a reactor.

Abstract: Powdered ferrous metal compositions are disclosed which provide for increased corrosion resistance through the admixing of powder aluminum containing compositions with standard ferrous metal compositions prior to forming the powder metal parts. In a preferred embodiment, the aluminum ranges is admixed as an FeAl alloy powder with the standard ferrous metal composition. The present invention further includes a powder metal ferrous part formed from the composition produced by a method including the steps of (i) providing a ferrous powder metal composition, (ii) admixing a powder aluminum containing composition with the ferrous composition to form a blended mixture, and (iii) forming a powder metal part from at least a portion of the blended mixture.

Abstract: A low-cost thermal decomposition degreasing method capable of drastically reducing the time required for a degreasing process which involves heating, vaporization and thermal decomposition, while assuring the shape retention property of an injection molded product during degreasing. The degreasing process comprises: (i) a first step wherein a molded product placed under a reduced pressure less than or equal to atmospheric pressure is heated at a temperature lower than the melting point of a thermoplastic binder so that the thermoplastic binder partially evaporates by 5 wt % or more, and then the molded product is further heated at a temperature lower than higher one of the melting points of a more volatile organic compound and a thermoplastic resin whereby the thermoplastic binder further evaporates by 10 wt % or more, and wherein the final temperature is set to 200.degree. C.

Abstract: A sintered friction material includes a copper alloy base and hard particles. The copper alloy base includes copper and at least one of, and preferably both, Zn and Ni within a total range of 5 to 40 wt % of the copper alloy base. The hard particles are uniformly dispersed in a matrix formed by the original composite copper alloy powder constituting the base, in a content amount within a range of 10 to 30 wt % of the friction material.

Abstract: The invention relates to an inorganic support obtained by sintering and intended to constitute a support for a filter membrane, the support comprising: an inorganic feedstock having a grain size greater than 20 .mu.m and constituted by a metal compound containing only one metal selected from the following metals: aluminum, silicon, and titanium; and an inorganic binder that reacts with the feedstock under the heat treatment conditions of the support in the range 1200.degree. C. to 1500.degree. C., so as to obtain a support having porosity greater than 25% and mechanical strength defined by ultimate bending stress for plane supports greater than 15 MPa, and by ultimate tensile stress for tubular supports greater than 5 MPa, without including a compound liable to create microcracks in the support.

Abstract: An electrical contact material for switching rated currents between 20 and 100 Ampere having improved operational life made of 3.2 to 19.9 wt-% tin oxide and 0.05 to 0.4 wt-%, in each case, of indium oxide and bismuth oxide, the remainder being silver. In the course of the manufacture of the material by powder metallurgy more than 60 wt-% of the tin oxide should exhibit a particle size of more than 1 .mu.m.

Abstract: Methods for making Cr-Me sputter targets wherein Me is a metal are disclosed. Preferably Me is a transition metal and most preferably is a member selected from the group consisting of Cu, Fe, and V. As a first step in the method, Cr and Me powder or crystals on the order of less than 100 mesh are provided. Preferably, the powders or crystals have a size of about 6-8 mesh. The Cr is present in a weight ratio amount of at least 50% Cr based upon the total combined weight of Cr and Me present. The Cr and Me components are then mechanically alloyed in a high energy ball mill or the like so as to provide an intimate mixture of powdered Cr-Me. The resulting powder is screened with, for example, a -20 -70 mesh screen, and then subjected to hot isostatic pressing (HIP) conditions to consolidate the powders at pressures of about 10,000 to 45,000 psi and temperatures of 800.degree. C. to 1500.degree. C. for about 1/4 to 5 hours.

Abstract: A process for the production of a shaped part which is produced from a high-melting point metal powder with crystalline sinter-activating additives. The process includes the steps of preparing, compressing and sintering the metal powder. Prior to the sintering step, the final contour of the shaped part is substantially shaped. The process is primarily directed for the production of shields for radiation protection, as melting crucibles or as electrodes.

Abstract: A cemented tungsten carbide body having a transition metal binder phase selected from the group consisting of iron, nickel and cobalt is formed, wherein the WC grains have an average WC grain size of at most about 0.5 micrometer in diameter and a maximum WC grain size of at most about 0.8 micrometer in diameter. Also, about 50 percent by volume of the WC grains in the body are angular grains and the body (1) contains an amount of the transition metal ranging from about 3 percent to about 18 percent by weight of the body, (2) is essentially free of grain growth inhibitors and (3) is essentially pore free.

Abstract: A sintered contact material comprising silver and nickel is characterized according to the invention in that the mass fraction of nickel is between 5 and 50%, and in that the nickel is present in the silver microstructure with average particle sizes (d) 1 .mu.m<d<10 .mu.m in largely homogeneous dispersion. A suitable method for preparing said sintered contact material is characterized in that, prior to sintering the nickel is introduced, in the way of mechanical alloying, into the silver microstructure, this operation taking place under an air atmosphere. Contact facings manufactured therefrom can be formed as strips or sections by means of extrusion, as individual contact pieces by means of a shaped part technique, and in each case as a two-layer structure.

Abstract: The present invention relates to a cemented carbide insert, comprising a cemented carbide substrate and a coating. The substrate contains WC and cubic carbonitride phase in a binder phase based of Co and/or Ni and has a binder phase enriched surface zone essentially free of cubic phase. The binder phase enriched surface zone prevails over the edge. As a result, an insert according to the invention has improved edge toughness and resistance against plastic deformation and is particularly useful for machining of sticky work piece materials such as stainless steel.

Abstract: A sintered body of titanium based carbonitride alloy containing hard constituents based on, in addition to titanium, one or more of the metals Zr, Hf, V, Nb, Ta, Cr, No or W in 5-30% binder phase based on Co and/or Ni is disclosed. The body has a binder phase enriched surface zone with a higher binder phase content than in the inner portion of the body in combination with an enrichment of simple hard constituents, i.e., the share of grains with core-rim structure is lower in the surface zone than in the inner of the body.A method of manufacturing the sintered carbonitride alloy is also provided which comprises forming a powder mixture containing binder phase containing Co and/or Ni and hard constituents of carbides and nitrides with titanium as a main component, the mixture having composition which is substoichiometric regarding an interstitial balance and sintering the mixture to completely transform the substoichiometric phases to stoichiometric by heating a) in vacuum to 1100-1200 C.

Abstract: The method of the invention is concerned with the manufacture of a molded copper-chromium family metal based alloy article which involves the steps of injection-molding a mixture of copper powder, a chromium family metal powder, an iron family metal powder and a thermoplastic organic binder made up of a polymer binder and low molecular binder in a ratio by volume of 5:1 to 1:1, dewaxing a molded body formed by the injection-molding by heating in a reducing atmosphere, and then sintering the dewaxed molded body at 1,100.degree. to 1,450.degree. C. in a reducing atmosphere. According to this method, molded articles having a high dimensional accuracy and high density can be provided.

Abstract: An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a jet mill. The resulting powder and metal powder are then mixed by blending of powder of all the various elements such as by means of a conventional blender to uniformly mix powdered substances and avoid stratification and settling. After the particles have been sufficiently mixed, they are degassed and then placed into a die and then into a cylindrical container where the particulates are subjected to extremely high pressures transforming the elements into a solid ingot. It is from these ingots that the extrusion tubes or other articles of manufacture may then be made.

Abstract: The invention has for its object the provision alloy steel powders for Cr-based high strength sintered bodies having high tensile strength, fatigue strength and toughness which are adapted for use in parts for motor vehicles and parts for OA apparatus.The composition of the alloy steel powder comprises, by wt %, not larger than 0.1% of C, not larger than 0.08% of Mn, 0.5-3% of Cr, 0.1-2% of Mo, not larger than 0.01% of S, not larger than 0.01% of P, not larger than 0.2% of O, optionally one or more of 0.2.about.2.5% Ni, 0.5.about.2.5% Cu and the balance being inevitable impurities and Fe. The sintered body has substantially the same composition provided that the content of C alone is limited to 0.2-1.2%.The manufacturing method comprises molding the above alloy steel powder, sintering the resulting green compact at a temperature of 1100.degree.-1300.degree. C. and immediately cooling at a cooling rate of 10.degree.-200.degree. C./minute.

Abstract: A method of producing a composite powder by providing particles of (I) tungsten, niobium, zirconium, titanium or mixtures thereof, (II) silicon and (III) carbon in a proportion relative to each other so as to possess an overall chemical composition in that segment of the ternary diagram of FIGS. 2(a), 2(b), 2(c) and 2(d) designated A, and subjecting the particles to a mechanical alloying process under conditions and for a time sufficient to produce the composite powder. Also disclosed is a method of forming a substantially oxygen-free composition of matter comprising a matrix substance of WSi.sub.2, NbSi.sub.2, ZrSi.sub.2, TiSi.sub.2 or alloys thereof having SiC dispersed therein, the method comprising consolidating the above-described composite powder. Also disclosed is a method of forming oxidation- and wear-resistant coatings by subjecting the composite powder whose composition lies in segment A to a metallurgical process such as plasma spraying.

Abstract: A particulate reinforced NiAl-AlN composite alloy has a NiAl matrix and greater than about 13 volume percent fine particles of AlN within the matrix. The particles preferably have a diameter from about 15 nanometers to about 50 nanometers. The particulate reinforced NiAl-AlN composite alloy may be prepared by cryomilling prealloyed NiAl in liquid nitrogen using grinding media having a diameter of from about 2 mm to about 6 mm at an impeller speed of from about 450 RPM to about 800 RPM. The cryomilling may be done for a duration of from about 4 hours to about 20 hours to obtain a cryomilled powder. The cryomilled powder may be consolidated to form the particulate reinforced NiAl-AlN composite alloy. The particulate reinforced alloy can further include a toughening alloy. The toughening alloy may include NiCrAlY, FeCrAY and FeAl.

Abstract: A composite material comprising a pure copper or dispersion strengthened copper matrix and a boron rich species, such as, but not limited to, elemental boron or boron carbide, for use in the fabrication of baskets that support spent nuclear fuel in nuclear waste containers. A method for manufacturing the composite material using powder metallurgy and hot extrusion.

Abstract: Process for producing very pure platinum materials dispersion-reinforced with Y.sub.2 O.sub.3 and having high strength and extensibility, even in the temperature range >800.degree. C., from platinum powder by mechanical alloying, which comprises the process stepspreparing platinum powder of high purity and low particle size of from 2 to 10 .mu.m,introducing and dispersing Y.sub.2 O.sub.3 particles >1 .mu.m in the platinum powder by milling in a platinum vessel using milling media of zirconium oxide,degassing the milled product under a vacuum of better than 10.sup.-3 mbar and with an increase in temperature to at least 1200.degree. C. in a platinum capsule for a period of up to 48 hours,gastight welding of the evacuated capsule and hot isostatic pressing at 1350.degree. C.

Abstract: In a method for manufacturing Nb.sub.3 Al phase by a diffusion reaction of Nb.sub.2 Al phase and Nb phase, a part of the Nb.sub.2 Al phase is remained and dispersed in the Nb.sub.3 Al phase homogeneously as for magnetic flux pinning centers for a high magnetic field. As for a method for dispersing the Nb.sub.2 Al phase homogeneously, a Nb.sub.3 Al group superconducting precursory composition obtained by dispersing Nb particles and Nb.sub.2 Al ultrafine particles by a mechanical alloying method is used, and further, by a conventional method for generating Nb.sub.3 Al phase by a diffusion reaction of Nb and an aluminum alloy, A Nb.sub.3 Al group superconductor can be achieved.

Abstract: A method of producing a molded ceramic article comprises the first step mixing powdery raw materials and a liquid additive, thereby obtaining a mixed raw material, the second step press-molding the mixed raw material obtained in the first step in a hydrostatically applied condition of pressure, thereby removing an excess of the liquid additive to obtain a preform, and the third step calcining the preform obtained in the second step to obtain a molded ceramic article. The molded ceramic article comprises, as a principal component, copper and, as essential components, Cr and Ni within composition ranges of 0.1.ltoreq.Cr<2 wt. % and 0.1.ltoreq.Ni<10 wt. % and further at least one additive component selected from the group consisting of the following composition ratios: the following composition ratios: 0<Fe<5 wt. %, 0.ltoreq.Co<5 wt. %, 0.ltoreq.Al<10 wt. %, 0.ltoreq.Ti<20 wt. %, 0.ltoreq.Mo<3 wt. %, 0.ltoreq.Si<3 wt. %, 0.ltoreq.V<3 wt. %, 0.ltoreq.Mg<1 wt. %, and 0.ltoreq.

Abstract: The invention relates to a neutron-absorbing material and to its production process.This material comprises a homogeneous, boron carbide matrix 1 in which are dispersed e.g. pseudospherical, 150 to 500 .mu.m , calibrated clusters 3 of boride such as HfB.sub.2, in order to prevent the propagation of cracks F in the material and improve its thermal shock resistance.

Abstract: A soldering tip comprising 50-95 weight percent uncoated copper particles and 5-50 weight percent iron particles is prepared by a method in which the particles are compacted, sintered and shaped into a soldering tip. The soldering tips are durable, resistant to pitting by molten solder, and thermally conductive.

Abstract: A composite, a sintered product of the composite, and a process for producing products from this composite. The composite has a very high volummetric proportion of TiC, and its remainder of a matrix. The TiC constitutes at least 70% by volume and as much as 95% by volume of the ultimate product. The process includes making a green body which can be handled and is thereafter pre-sintered to form a pre-form. The pre-form is oversized relative to the ultimate product. It is sintered and machined, again oversize. Then it is again sintered and subjected to hot isostatic compression, to assume at least a close approximation to the pre-determined dimension of the product. It is characterized by its light weight, resistance to erosion, and resistance to chemical attack.

Abstract: A nickel-base superalloy article has a coating having a composition, in weight percent, of from about 10 to about 20 percent cobalt, from about 14 to about 25 percent chromium, from about 2 to about 12 percent aluminum, from 0 to about 0.2 percent yttrium, from about 0.001 to about 3 percent boron, from about 1 to about 10 percent silicon, balance nickel and incidental impurities. The coating is preferably applied by mixing together two powders, one with a higher solidus temperature and one with a lower solidus temperature, whose net composition is that of the coating. The powder mixture is compacted with a binder, applied to a surface of the article, and heated to a temperature above the lower solidus temperature.