Abstract: The present invention relates to a sinter and a casting comprising a high-hardness glassy alloy containing at least Fe and at least a metalloid element and having a temperature interval &Dgr;Tx of a supercooled liquid as expressed by &Dgr;Tx=Tx−Tg (where, Tx is a crystallization temperature and Tg is a glass transition temperature) of at least 20° C., which permit easy achievement of a complicated concave/convex shape.

Abstract: A cermet tool is made up of a binder metallic phase forming component of Ni or Ni and Co and a hard phase including a hard phase metallic element component of Ti as its main part and one or more of an additional metallic compound selected from V, Cr, Zr, Nb, Mo, Hf, Ta and W. A surface coating layer is formed on the surface of the cermet. The surface coating layer satisfies at least one of the appearance lightness Vs of 6 or more and the saturation Cs of 4 or more. When wear of a tip of a cermet tool proceeds, that part changes its color to a blackish tone (corresponding, for example, to Vs of from 4 to 1 and Cs of from N to 3). By adjusting the appearance lightness and the saturation of the surface coating layer to the ranges described above, a worn part and a non-worn part are easily distinguished by the naked eyes based on the difference in lightness or hue. As a result, distinction of a spent tool and judgement of the life of the tool can be easily conducted.

Abstract: A method comprising incorporation of an inorganic polymer precursor of a grain growth inhibitor into superfine materials or intermediates useful for the production of superfine materials. The precursor/nanostructured material composite is optionally heat treated at a temperature below the grain growth temperature of the superfine material in order to more effectively disperse the precursor. The composites are then heat treated at a temperature effective to decompose the precursor and to form superfine materials having grain growth inhibitors uniformly distributed at the grain boundaries. Synthesis of the inorganic polymer solution comprises forming an inorganic polymer from a solution of metal salts, filtering the polymer, and drying. Alloying additives as well as grain growth inhibitors may be incorporated into the superfine materials.

Abstract: A process for producing a ceramic-metal composite, includes (1) mixing TiO2, and optionally Ti, with at least one of a boron-containing or carbon-containing material to give a green body mix; (2) heat treating the green body mix to a temperature from 900° C. to 1900° C. and below a temperature which leads to an autocatalytic reaction; (3) carrying out an exchange reaction between the material and the TiO2 to give a reaction product comprising at least one of TiBx and TiCy, wherein 0≦x 23 2 and 0≦y≦1; (4) producing a porous green body from the reaction product; (5) filling the porous green body with liquid aluminum after the exchange reaction; and (6) carrying out a reaction between the reaction product in the green body and the aluminum to form the ceramic-metal composite comprising a ceramic phase selected from the group consisting of TiBx-, TiCy-, TiCN- and Al2O3 and a comprising a metallic phase comprising an intermetallic compound of Ti and Al.

Abstract: Permanent rare-earth magnets containing Ce are fabricated with coercivity greater than 4 kOe. One composition for such magnets is [CeyR1−y]z(F1−vBv)1−z, where R is one or more rare-earth elements, F is Fe or Fe—Co, and the relative elemental atomic composition is 0.0<y≦0.3, 0.04≦z≦0.25, and 0.01≦v≦0.30. Another composition is [(CexLa1−x)yR1−y]z(F1−vBv)1−z, with the relative elemental atomic composition x<0.4 or 0.9<x≦1.0 and 0.2≦y≦0.8, 0.04≦z≦0.25, and 0.01≦v≦0.30.

Abstract: A permanent magnet has a base composition of SE—Fe—B, wherein SE is at least one rare earth element, including Y, and having the tetragonal phase SE2Fe14B as the principal phase, and additionally having an iron-free and boron-free phase of the general formula SE5(Co, Ga), as a binder alloy. In a method for making such a permanent magnet, a powder of a base ally having the tetragonal phase composition, and a binder alloy having the aforementioned general formula composition, are mixed in a weight ration between 99:1 and 90:10.

Abstract: A powder metallurgy article formed of a sulfur-containing, precipitation-hardenable, stainless steel alloy is described. The article has a unique combination of strength, ductility, processability, and machinability. The powder metallurgy article is formed of a stainless steel alloy having the following composition in weight percent. C 0.03 max. Mn 1.0 max. Si 0.75 max. P 0.040 max. S 0.010-0.050 Cr 10-14 Ni 6-12 Ti 0.4-2.5 Mo 6 max. B 0.010 max. Cu 4 max. Co 9 max. Nb 1 max. Al 1 max. Ta 2.5 max. N 0.03 max. The balance of the alloy is iron and the usual impurities. The powder metallurgy article according to this invention is characterized by a fine dispersions of titanium sulfides that are not greater than about 5 &mgr;m in major dimension. A method of preparing the powder metallurgy article is also described.

Abstract: A hard magnetic material contains Co as a main component, at least one element Q of P, C, Si and B, and Sm, and an amorphous phase and a fine crystalline phase. The texture of the hard magnetic material contains 50% by volume or more of fine crystalline phase having an average crystal grain size of 100 nm or less, and has a mixed phase state containing a soft magnetic phase and a hard magnetic phase. Further, anisotropy is imparted to the crystal axis of the hard magnetic phase.

Abstract: A composite body of a microwave sintered composition of a cermet or hard metal as a modified surface layer which can promote the microwave sintering and can be of a thickness of 0.01 to 1 mm with a density gradually decreasingly inwardly or a thickness up to 1 mm and having locally distributed compacts therein or which can be a layer of a thickness of 1 to 10 mm of a substantially pure metal or which can have a binder metal removed to a depth of about half the grain thickness of a hard material such as WC.

Abstract: A method of producing high coercivity FePt—Si3N4 granular composite thin films for magnetic recording media is invented. The method includes magnetron co-sputtering of FePt and Si3N4 targets at controlled sputtering power and sputtering argon gas pressure to form a selective composition of granular FePt—Si3N4 thin film on a low temperature substrate, then post-annealed in vacuum at selective time period and temperature. Two kinds of FePt targets can be used. One is the FePt alloy target. The other one is a composite target consisting of an iron disk overlaid with small Pt pieces. This arrangement provides a wide range of effective target compositions and therefore film compositions. FePt—Si3N4 films were deposited on natural oxidized silicon wafer or quartz glass substrate at room temperature. The as-deposited film has soft magnetic properties and granular structure with soft magnetic &ggr;-FePt particles dispersed in amorphous Si3N4 matrix.

Abstract: Disclosed is a high nitrogen stainless steel alloy and alloy powder comprising chromium (Cr), molybdenum (Mo), manganese (Mn), nickel (Ni), nitrogen (N) and iron (Fe). The composition of the stainless steel alloy and powder comprises between about 27 and about 30% by weight Cr, between about 1.5 and about 4.0% by weight Mo, Mn present and is present in an amount up to 15% by weight, at least about 8% by weight Ni, and about 0.8 to about 0.97% by weight N with the balance being iron. It has been discovered that forming an alloy of this chemistry using nitrogen gas atomization process, followed by a consolidation process, the alloy is less likely to form detrimental ferrite, stable nitride and sigma (&sgr;) phases, without the need for further processing, such as solution treating and quenching. This allows for the formation of stainless steel articles having a thicker cross-section with reduced processing cost.

Abstract: The invention relates to a steel having the following alloy composition in weight-%: 1.4-1.6 (C+N), max. 0.6 Mn, max. 1.2 Si, 3.5-4.3 Cr, 1.5-3 Mo, 1.5-3 W, wherein 6<W.sub.eq <9, and W.sub.eq =% W+2.times.% Mo, 3.5-4.5 V, max. 0.3 S, max. 0.3 Cu, max. 1 Co, a total amount of max. 1.0 of Nb+Ta+Ti+Zr+Al, a total amount of 0.5 of other elements, including impurities and accessory elements in normal amounts, balance iron, and with a microstructure substantially consisting of a martensitic matrix and in the matrix 2-15, preferably 5-10 volume-% undissolved hard products having the particle size 0.1-3 .mu.m, said hard products being of MX-type, where M is V and X is C and/or N, wherein 40-60% of the C and N content of the alloy is bound to vanadium as carbides and/or as carbo-nitrides, and a functional amount of hard products precipitated in the martensitic matrix after solution heat treatment of the steel at a temperature between 1000 and 1225.degree. C. and tempering at least twice for at least 0.

Abstract: A corrosion resistant sintered body having excellent ductility is provided by sintering, at temperatures of not less than 1050 to less than 1300.degree. C., powders which are composed by adding metal compound of B to and mixing with powders of ferrite stainless steel containing C.ltoreq.0.1 wt %, Si.ltoreq.3.0 wt %, Mn.ltoreq.0.30 wt %, Ni.ltoreq.2.0%, 11 wt %.ltoreq.Cr.ltoreq.22 wt %, Mo.ltoreq.3.0%, and the rest being substantially Fe, at an amount of B in the mixed powders being between more than 0.03 wt % and less than 0.2 wt % based on the weight of the powder.

Abstract: A powdered metal blend mixture for making a powdered metal part especially a valve seat insert. The mixture includes 15 to 30 wt. % of a valve steel powder, 0 to 10 wt. % nickel, 0 to 5 wt. % copper, 5 to 15 wt. % of a ferro-alloy powder, 0 to 15 wt. % of a tool steel powder, 0.5 to 5 wt. % of a solid lubricant, 0.5 to 2 wt. % graphite, 0.3 to 1.0% of a temporary lubricant, and the balance being substantially a low alloy steel powder containing 0.6 to 2.0 wt. % molybdenum, 0 to 5 wt. % nickel, and 0 to 3.0 wt. % copper. The present invention provides improved high temperature wear and corrosion resistance over prior art materials as well as improved machinability. The blend of the present invention provides a relatively high density material that allows for a single press and sinter technique.

Abstract: A method of producing a composite material, in particular for sintered slide bearings and slide bearings.Composite materials for sintered slide bearings consist of at least one ceramic sintered material and at least one metallic sintered material and have a short service life during operation at low speeds of the shaft and in the case of a simultaneously high radial load because the lubricant stored in the bearing cracks. The novel sintered bearing is to have a long service life under such operating conditions.In the novel bearing use is made of ceramic sintered materials which have a high thermal conductivity, e.g. boron nitride.The novel composite material and the novel slide bearing are particularly suited for electric miniature motors comprising a ceramic shaft.

Abstract: A permanent magnet having substantially stable magnetic properties is disclosed having as the active magnetic component a sintered product of compacted particulate iron-boron-rare earth intermetallic material, said sintered product having pores which are substantially non-interconnecting, a density of at least 87 percent of theoretical and a composition consisting essentially of in atomic percent about 13 to about 19 percent rare earth elements, about 4 to about 20 percent boron and about 61 to about 83 percent of iron with or without impurities; where the rare earth content is greater than 50 percent praseodymium with an effective amount of a light rare earth selected from the group consisting of cerium, lanthanum, yttrium and mixtures thereof, and balance neodymium.

Abstract: A sintered Ti alloy material and a process for producing the same, which comprises a matrix mainly comprising a Ti alloy, and TiB dispersed and maintained in said matrix, wherein a composition of the sintered Ti alloy material at least comprises from 0.1 to 8.0% by weight of B, from 3.0 to 30.0% by weight of Mo, 50% by weight or more of Ti, and the balance of unavoidable impurities.

Abstract: Powder is composed of ferrite stainless steel containing: C: .ltoreq.0.1 wt %, Si: .ltoreq.3.0 wt %, Mn: .ltoreq.0.30 wt %, Ni: .ltoreq.2.0 wt %, Cr: 11 to 22%, Mo: .ltoreq.3.0 wt %, and the rest being substantially Fe. The metal compound of B, preferably CrB, is added to the powder as the amount of B being between more than 0.03 wt % and less than 0.2 wt % based on the amount of the powder.

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: The invention concerns a nickel free stainless steel alloy having a ferritic and magnetic structure, characterised in that it contains at least 0.4% in weight of nitrogen, and at most 0.5% in weight of nickel, the remainder being formed of iron and the inevitable impurities. The invention also concerns an external part for a watch made of such a steel alloy.

Abstract: The invention relates to bullets having increased frangibility (or which can be easily fragmented) and to materials and processes for the manufacture of such bullets. The bullets of the present invention are typically made from copper or copper alloy powders (including brass, bronze and dispersion strengthened copper) which are pressed and then sintered under conditions so as to obtain bullets with the desired level of frangibility. In preferred embodiments of the invention, the bullets also contain several additives that increase or decrease their frangibility.

Abstract: An AlN dispersed powder aluminum alloy with a particular composition and structure has excellent wear resistance, seizure resistance, heat resistance, toughness and machinability. In the structure of the alloy, AlN layers are discontinuously dispersed along some of the grain boundaries of former aluminum alloy particles in the matrix of an aluminum alloy sintered body. Diffusion and sintering progresses between non-nitrided grains at areas of grain boundaries not having AlN layers, to attain strong bonding between the grains. A nitriding accelerative element such as Mg, Ca or Li is provided in some of the grains to promote the discontinuous formation of the AlN layers. Additionally, layers of a nitriding suppressive element such as Sn, Pb, Sb, Bi or S may be discontinuously dispersed at regions along some of the grain boundaries, and bonding between grains is achieved at these regions as well.

Abstract: A hard sintered alloy having not only a wear resistance, a high corrosion resistance and a heat resistance but also a sufficiently high strength and a high tenacity in a wide temperature region from normal temperature to a high temperature is provided. In a sintered alloy comprising a hard phase containing mainly 35-95% of Mo.sub.2 NiB.sub.2 type complex boride, and a binding phase of hard phase binding Ni group constituting the rest, 0.1-8% of Mn with respect to the whole composition is. added, whereby a hard sintered alloy having a high strength, a high tenacity and a high corrosion resistance is obtained.

Abstract: A new family of chromium boride coatings having excellent adhesive wear and corrosion resistance is disclosed. The coatings comprise hard, ultrafine, chromium boride particles dispersed in a metal matrix, the particles having an average particle size of less than one micron and constituting less than about 30 volume percent of the coating, the balance being metal matrix. The metal matrix may be composed of nickel or a nickel base alloy containing a metal selected from the group consisting of chromium, silicon and iron. The coatings may be prepared by a process which comprises depositing a mechanically blended powder mixture of chromium metal or a chromium alloy or mixture of both, and a boron-containing alloy onto a substrate and then heat treating the as-deposited coating. The heat treatment effects a diffusion reaction between the deposited elements resulting in the formation of ultrafine particles of chromium boride dispersed in a metal matrix.

Abstract: The present invention relates to particle agglomeration of aluminum powder using a lubricating binder. The resulting powder has improved flowability and can be shaped easily. The aluminum particles are admixed with a lubricant, e.g. polyethylene, and are held together by the lubricant. To agglomerate the aluminum powder, the lubricant is melted and is then solidified to form solid bridges between the aluminum powder particles. The lubricant may be burned out cleanly at temperatures lower than 450.degree. C.

Abstract: A slide member of a sintered aluminum alloy includes a matrix (1) formed of an aluminum alloy powder, and aluminum nitride films (2) dispersed along old, i.e. former original, powder grain boundaries of this matrix. When a state in which the aluminum nitride films (2) completely continuously enclose the peripheries of the old powder grain boundaries is defined as a dispersion ratio of 100%, the present aluminum nitride films (2) are discontinuously dispersed at a dispersion ratio of not more than 80%. A powder compact consisting of rapidly solidified aluminum alloy powder is heated and held in a nitrogen gas atmosphere, thereby facilitating reaction between aluminum and nitrogen through an exothermic phenomenon following deposition of elements solidly dissolved in the aluminum alloy, for forming aluminum nitride films dispersed on the aluminum alloy powder grain surfaces.

Abstract: An extruded metal matrix composite incorporates boron carbide in fine particulate form. The composition is useful as a radiation shield.

Abstract: An improved coldforming tool made of a zone in a tungsten carbide-cobalt cemented carbide is disclosed. The tool, preferably a wire drawing nib, contains WC with a mean grain size of 1.5-2 .mu.m and 5-7 weight % Co and with a carbon content close to saturation level and sufficient to exhibit cobalt magnetic measurements of 92%-98% of that of pure cobalt.

Abstract: A disclosed gradient function material is produced by molding and thereafter firing a slurry which contains a plurality of groups of particles having different specific gravities. The plurality of groups of particles include at least a first group of particles and a second group of particles. The first group of particles comprises a group of non-metal particles having a specific gravity ranging from about 3 to 7 and a maximum particle diameter equal to or smaller than a deflocculation limit, said non-metal particles being made of one or more materials selected from the group consisting of an oxide, a carbide, a nitride, and an oxynitride. The second group of particles comprises a group of metal particles having a specific gravity which is about 1.5 times the specific gravity of said first group of particles, and particle diameters distributed across the deflocculation limit.

Abstract: An iron based powder mixture for powder metallurgy is provided which can produce a sintered material having by far higher machinability and sliding properties than conventional sintered materials, and also a sintered material containing alloy elements but having adaptability to sizing even after sintering; it comprises an atomized iron powder comprising S in a content of 0.03 to 0.30 wt %, Mn in a content of 0.05 to 0.40 wt % and the balance Fe and incidental impurities, to which is added one or more than one B-containing compound powder selected from boron nitride (BN), boric acid (H.sub.3 BO.sub.3), boron oxide (B.sub.2 O.sub.3) and the like in an amount of 0.001 to 0.3 wt % expressed as B, and incorporated with an MnS powder in an amount of 0.05 to 1.0 wt %, optionally alloyed partially with or prealloyed with Ni, Mo and Cu.

Abstract: A titanium carbonitride-based alloy which is excellent in chipping resistance and wear resistance is disclosed. A hard phase is a carbide (TiMC), a nitride (TiMN) or a carbonitride (TiMCN) of Ti and at least one metal (M), other than Ti, selected from those belonging to the groups IVa, Va and VIa of the periodic table. A binder phase contains Co and Ni as main components. When the structure of the titanium-based alloy is observed with a scanning electron microscope, particles forming the hard phase in the alloy have black core parts which are located on core portions to appear black and peripheral parts which are located around the black core parts to appear gray. Assuming that A and B represent particles having the black core parts occupying areas of at least 30% of the overall particles A and those having the black core parts occupying areas of not more than 30% of the overall particles B respectively, the area ratio of the particles A to the particles B satisfies a condition of 0.3.ltoreq.A/(A+B).ltoreq.0.

Abstract: A high vanadium, powder metallurgy cold work tool steel article and method for production. The nickel, chromium, vanadium, and carbon plus nitrogen contents of the steel are controlled during production to achieve a desired combination of corrosion resistance, metal to metal wear resistance, and hardenability.

Abstract: A blend of pre-alloyed stainless steel powder for use in producing sintered stainless steel, said powder consisting essentially of, by weight, up to 0.05% carbon, 22% to 26% chromium, 10% to 24% nickel, 2.7% to 5% molybdenum, 0.1% to 1% boron, up to 2.0% manganese, up to 2.0% silicon, balance iron and residuals, together with manganese sulfide particles added thereto until they comprise up to 4%, by weight, of the overall blend, experimental results having shown that the blend offers significant improvements in the machinability of the resulting steel. The patent also claims a method for making sintered steel using the blend, as well as the sintered steel resulting from the process.

Abstract: The invention relates to ZrB.sub.2 /Cu composites, and more specifically to methods of making ZrB.sub.2 /Cu composite electrodes and methods of using ZrB.sub.2 /Cu composite electrodes. ZrB.sub.2 powder is contacted with a polymer and shaped to a desired form. The polymer is vaporized and the ZrB/.sub.2 powder is sintered. The sintered ZrB.sub.2 is contacted with Cu and heated above the melting point of Cu which causes the Cu to infiltrate the ZrB.sub.2, forming the ZrB.sub.2 /Cu composite electrode.

Abstract: A method of producing a radially anisotropic sintered R-Fe-B-based magnet wherein R is at least one rare earth element including Y, in which a green body stack comprising a plurality of compact bodies are formed in series by the same die. The density of the compact body is regulated to 3.1 g/cm.sup.3 or more, and increased at the final compacting step to a density at least 0.2 g/cm.sup.3 higher than that before the final compacting step. By so regulating the density of the green body, the cracking during the sintering process at the binding portion, an interface between the stacked compact bodies, can be minimized while retaining high magnetic properties of the resulting magnet.

Abstract: A high vanadium, powder metallurgy cold work tool steel article and method for production. The nickel, chromium, vanadium, and carbon plus nitrogen contents of the steel are controlled during production to achieve a desired combination of corrosion resistance, metal to metal wear resistance, and hardenability.

Abstract: A sintered Fe alloy for a valve seat is made of a prepared powdery alloy which comprises C of from 0.3 wt. % to 1.6 wt. %, Cu of from 5 wt. % to 20 wt. %, hard particle of from 5 wt. % to 40 wt. % which consists of at least one species selected from ferroalloy, ceramic and intermetallic compound, and a balance which is a powdery Fe atomizing alloy containing at least one species of from 1 wt. % to 8 wt. % selected from Cr and Mo. The prepared powdery alloy containing the above-mentioned component and content is subject to a press forming process by a compression molding to form a green compact body which is then sintered. The sintered Fe alloy has a high thermal conductivity, a high strength at a high temperature and an excellent abrasion resistance, and, moreover, can be used for a valve seat provided in a high function engine.

Abstract: Double cemented carbide composites comprise a plurality of first regions and a second ductile phase that separate the first regions from each other. Each first region comprises a composite of grains and a first ductile phase bonding the grains. The grains are selected from the group of carbides consisting of W, Ti, Mo, Nb, V, Hf, Ta, and Cr carbides. The first ductile phase is selected from the group consisting of Co, Ni, Fe, alloys thereof, and alloys with materials selected from the group consisting of C, B, Cr, Si, and Mn. A preferred first region comprises tungsten carbide grains that are cemented with a cobalt first binder phase and which are in the form of substantially spherical pellets. The second ductile phase is selected from the group consisting of Co, Ni, Fe, W, Mo, Ti, Ta, V, Nb, alloys thereof, and alloys with materials selected from the group consisting of C, B, Cr, and Mn. A preferred second ductile phase is cobalt.

Abstract: A method and system for synthesizing nanocrystalline material. A system includes a chamber, a nonconsumable cathode shielded against chemical reaction by a working gas not including an oxidizing gas, but including an inert gas, a consumable anode vaporizable by an arc formed between the cathode and the anode, and a nozzle for injecting at least one of a quench and reaction gas in the boundaries of the arc.

Abstract: A cermet including a cermet core zone in which the content of a binder amounts to at most 90% by mass in relationship to a cermet hard phase is formed with a 0.01 to 3 um deep surface layer having an increased resistance to wear compare to the cermet core zone.

Abstract: A high-modulus iron-based alloy containing at least one boride dispersed in an iron or iron-alloy matrix. The boride may be one of a Group IVa element, or a complex boride of at least one Group Va element and iron. A mixture of an iron or iron-alloy powder and a powder of at least one boride containing a Group IVa or Va element is compacted and sintered to make a shaped high-modulus iron-based alloy product.

Abstract: A consolidated, fully dense, high yield strength, austenitic stainless steel and article produced therefrom having improved pitting resistance and a low sigma solvus temperature. The article is produced from nitrogen gas atomized prealloyed particles. The steel and article have a high nitrogen content for increased strength and corrosion resistance.

Abstract: In the manufacture of a rare earth sintered magnet of the Nd.sub.2 Fe.sub.14 B system, closed voids are formed in the magnet in a predetermined fraction to minimize shrinkage. Unlike open voids or pores in conventional semi-sintered magnets, the closed voids do not incur magnet corrosion since they do not communicate to the magnet exterior. By minimizing shrinkage during sintering in this way, a ring or plate-shaped thin wall anisotropic magnet can be prepared without machining for shape correction, achieving a cost reduction and a productivity improvement. Since a high density compact has a high deflective strength, it is easy to handle, minimizing cracking and chipping between the compacting and sintering steps.

Abstract: Improved nickel-base alloys of enhanced strength and corrosion resistance, produced by atomization of an alloy melt under an inert gas atmosphere and of composition 0-20Fe, 10-30Cr, 2-12Mo, 6 max. Nb, 0.05-3 V, 0.08 max. Mn, 0.5 max. Si, less than 0.01 each of Al and Ti, less than 0.05 each of P and S, 0.01-0.08C, less than 0.2N, 0.1 max. 0, bal. Ni.

Abstract: The present invention provides an alumina-aluminum nitride-nickel (Al.sub.2 O.sub.3 -AlN-Ni) composite which can be prepared by pressureless sintering Al.sub.2 O.sub.3 and NiAl alloy powders or by pressureless sintering Al.sub.2 O.sub.3, Ni and Al powders in a nitrogen-containing atmosphere. The mechanical properties and the thermal conductivity of the obtained composite are better than those of alumina alone, while the electrical resistivity of the composite remains high. The composite thus is suitable for use as an electronic substrate or package.

Abstract: A powdered metal piston ring includes a structure of predominantly pearlite with a dispersion of metallic particles having an element with a high affinity for nitrogen. The ring is nitrided to form a hard surface layer at an outer periphery of the ring. The layer includes a first iron nitrided region and an adjacent region having greater hardness because of a reaction between the metallic particles and nitrogen. Preferred metallic particles include a high chromium steel alloy which forms part of the original powder metal of the piston ring.

Abstract: The present invention provides a vane material having an excellent scuffing resistance in a compressor employing an alternative Freon gas as a cooling medium and a process for the preparation thereof. In accordance with the present invention, a vane material is provided having a structure comprising a base material consisting essentially of 1.0 to 4.5% by weight of carbon, not more than 1.5% by weight of silicon, not more than 1.0% by weight of manganese, 3 to 6% by weight of chromium, not more than 30% of tungsten and/or not more than 20% by weight of molybdenum provided that (W+2Mo) is not more than 45% by weight, 2 to 10% by weight of vanadium and/or niobium, not more than 20% by weight of cobalt, and a balance of iron and inavoidable impurities with additive particles of a carbide and additive particles of a nitride and/or a carbonitride, sintered thereto in an amount of more than 0% to not more than 25% by weight and 2 to 25% by weight based on the total weight of the vane material, respectively.

Abstract: Composite materials are disclosed comprising a continuous matrix with composite reinforcements therein. The composite materials may include a continuous metal, metal alloy or intermetallic matrix with intermetallic matrix composite reinforcements dispersed therein. Suitable metals for the continuous matrix include Al, Ti, Cu and Fe, and alloys and intermetallics thereof. The composite reinforcements comprise ceramic particles dispersed in a continuous intermetallic matrix. Suitable intermetallics include alumnides of Ti, Cu, Ni, Mg and Fe, while suitable ceramics include refractory metal borides, carbides, nitrides, silicides and sulfides. In one embodiment, the ceramic particles are formed in-situ within the intermetallic matrix of the composite reinforcements. The composite materials are produced by powder metallurgical techniques wherein powders of the continuous matrix component and powders of the composite reinforcement are blended and consolidated.

Abstract: An Fe-based soft magnetic alloy having a high saturated magnetic flux density and having a composition represented by formula (I) below:(Fe.sub.1-a Q.sub.a).sub.b B.sub.x T.sub.y T'.sub.z (I)wherein Q represents at least one element selected from the group consisting of Co and Ni; T represents at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W, with Zr and/or Hf being always included; T' represents at least one element selected from the group consisting of Cu, Ag, Au, Ni, Pd and Pt; a, b, x, y and z are real numbers satisfying relationships below:0.ltoreq.a.ltoreq.0.05,0.ltoreq.b.ltoreq.93 atomic %,0.5.ltoreq.x.ltoreq.16 atomic %,4.ltoreq.y.ltoreq.10 atomic %,0.ltoreq.z.ltoreq.4.5 atomic %provided that when 0<z.ltoreq.4.5 atomic %, Q represents Co and 0<b.ltoreq.92 atomic %; and when z=0, 0.5.ltoreq.x.ltoreq.8 atomic % and 4.ltoreq.y.ltoreq.9 atomic %.

Abstract: Aluminum nitride powder, aluminum nitride platelets, powdered solid solutions of aluminum nitride and at least one other ceramic material such as silicon carbide, and composites of aluminum nitride and transition metal borides or carbides are prepared by combustion synthesis at low gaseous nitrogen pressures. Porous bodies of aluminum nitride or composites of aluminum nitride and transition metal borides or carbides are also prepared by combustion synthesis at these pressures. The porous bodies are suitable for infiltration, either as formed or after being coated with at least one layer of a silicate material, by polymers or metals. The powders are also suitable for preparing dense sintered bodies. The aluminum nitride powder is also used to prepare AlN sintered bodies.