Abstract: A sintered ceramics for cutting tools having a relative apparent density of not less than 98% is obtained by sintering a mixture substantially consisting of 80-95% by volume alumina and the balance of titanium nitride and Zr-containing component(s) such as Zr, ZrC and/or ZrN wherein the volumetric ratio of TiN /Zr-containing component(s) ranges 95/5-50/50 in vacuum and/or vacuum inert atmosphere. Although the present invention does not need any application of hot pressing or HIP process, the resultant ceramics has an improved abrasion resistance comparable to those obtained by the latter processes.

Abstract: A process for machine cutting of cast iron with a shaped tool which is a ceramic having as constituent ingredients about 4 to about 12% by weight Y.sub.2 O.sub.3 and a balance consisting essentially of Si.sub.3 N.sub.4 and which has a density of at least 3.25 gm./cm.sup.3.

Abstract: Ceramic materials intended for cutting and consisting of aluminum oxide with additives of hard carbides or nitrides, particularly titanium carbide, have up to now, because of their sintering inertia, in general been pressure sintered to obtain satisfactory properties. According to the present invention a ceramic alloy of excellent technological properties has been formed and comprises principally Al.sub.2 O.sub.3 and hard nitrides or carbonitrides, such as TiN or Ti(C,N) in which the alloy contains from 2 to 95 v/o of an Al--O--N-compound, such as nitrogen stabilized aluminum oxide with cubic or nearly cubic structure.

Abstract: An ultrasharp diamond edge or point, which may be a monocrystalline diamond cut and ground to provide an ultrasharp edge or point or a polycrystalline diamond molded from ultrafine diamond or graphite powder to form an ultrasharp edge or point is irradiated with an electron microbeam and preferably simultaneously is subjected to a controlled jet of highly purified gas in an enclosure at low temperature and low pressure to smooth out any minute irregularities and to obtain an atomic smoothness, glazing and annealing. By selectively masking the surface of the diamond edge or point or facet planes, the effect of the irradiation or jet can be confined to well defined areas.

Abstract: Lead and carbon deposits are removed from the chambers and barrels of firearms by applying thereto a liquid composition having from 45 to 55 weight percent aluminum oxide, from 40 to 50 weight percent of a hydrocarbon oil boiling in the range of about 150 degrees to 350 degrees centigrade, from 3.5 to 4.5 weight percent of lemon oil, and from 0.5 to 1.5 weight percent of ammonium chloride. The liquid composition is impregnated onto a woven web, such as a cotton cloth.

Abstract: The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of .alpha.-alumina and a secondary phase, to a method of making the same employing chemical ceramic technology, and to abrasive articles made with the abrasive mineral.

Abstract: Disclosed is an improved process for preparing a composite compact wherein a mass of abrasive crystals, a mass of metal carbide, and a bonding medium are subjected to a high-temperature/high pressure process for providing a composite compact. The sintered carbide mass supports the mass of abrasive crystals and bonding or catalyst metal, and the abrasive crystal grains are directly bonded to adjacent crystal grains in the mass thereof. Such improved process comprises disposing the mass of abrasive crystals in layers wherein the coarsest layer is closest to the carbide mass and is composed of crystals having a largest dimension of between about 75 and 500 microns and the finest layer is disposed farthest away in the carbide mass and is composed of crystals having a largest dimension of less than 10 microns.

Abstract: A method for producing hexagonal, laminar, alpha aluminum oxide monocrystals having a grain size of about 16 to about 250 microns, and a diameter to thickness ratio of about 3:1 to about 7:1. Aluminum hydroxide of particle size greater than 60 microns is calcined in the presence of a fluorine-containing mineralizer at a temperature of greater than 1200.degree. C. but no more than 1450.degree. C., and the desired grain size is separated from the calcinate.

Abstract: A silicon nitride based ceramic tool is disclosed which is prepared from the starting powder compositions surrounded by and including the lines defined by the points A, B, and C and preferably D, E, and F in the FIGURE.

Abstract: Ceramic materials for use in high-speed cutting, comprising Al.sub.2 O.sub.3, ZrO.sub.2 and at least one alkali earth oxide selected from CaO and MgO, the weight ratio of Al.sub.2 O.sub.3 /ZrO.sub.2 is in the range from about 95/5 to 99.5/0.5, the molar ratio of (CaO+MgO)/ZrO.sub.2 is in the range from about 0.05/1 to 0.2/1, and at least 50% of the ZrO.sub.2 in the material is cubic ZrO.sub.2, and the remainder is monoclinic ZrO.sub.2.

Abstract: Cubic boron nitride has been made from powdered hexagonal boron nitride by a process which comprises vacuum firing of the HBN and conversion by high pressure-high temperature processing at 55-80 kilobars and 1600.degree. C. to the reconversion temperature.The high pressure reaction cell has a special design which prevents the entrance of impurities into the sample. This cell, referring to FIG. 2, comprises, for example, a carbon tube (8) enclosing concentric titanium sleeve (9). Within the cylinder defined by the tube and sleeve are: the HBN sample (4), carbon filler (3), shielding tantalum foil discs (2) and carbon end plugs (10).The vacuum firing is done at pressures of 10.sup.-5 --10.sup.-10 mm Hg, 1400.degree.-1900.degree. C., for 5 minutes--4 hours, and is believed to form a thin, free-boron coating on the HBN particles.The process works on both pyrolytic (turbostratic) and graphitic hexagonal boron nitride.

Abstract: A method is disclosed for removing stock from a metal part comprised of steel, malleable cast iron or nodular cast iron. A moving relationship is established between the part and a cutting tool formed of a substantially full dense hot pressed ceramic material consisting essentially of a generally uniform mixture of 50-70% by weight Al.sub.2 O.sub.3 and the remainder substantially Si.sub.3 N.sub.4. The tool is advanced into the surface of the part at a predetermined depth of cut and feed rate which results in the removal of stock from the part during periods of relative movement. A portion of the Al.sub.2 O.sub.3 may be replaced by up to 15% stabilized ZrO.sub.2 or HfO.sub.2 to further improve strength at higher temperatures.

Abstract: The present invention relates to compositions for the manufacture of abrasive tools which can be most effectively used for the manufacture of tools employed for machining of articles made of sitals, hard alloys and other difficultly machinable materials. This composition contains, as a binding agent, compounds selected from the group of caustic alkalis in combination or separately, the composition components having the following proportions, percent by volume:______________________________________ abrasive powders 12.5 to 37.5 metal powders 25.0 to 62.5 caustic alkalis 12.5 to 50.

Abstract: A friction material of the present invention is directed to secure a required value of an initial effect and the following effects after a friction hysteresis during a brake operation by adding 20-60 wt. % of a high carbon iron powder instead of a ceramic powder in the conventional friction material and also succeed in improving a wear resistance at a high temperature by further adding 0.5-10.5 wt. % of antimony trioxide as a flame retarding material.

Abstract: The corrosion and staining of unlined aluminum tube surfaces by dentifrices such as toothpastes, particularly when the dentifrices contain therapeutic agents, is substantially prevented by incorporation into the dentifrice of a controlled amount of an alkaline earth metal ion such as calcium ion, in the range of 0.005-0.2 weight percent, and preferably in the range of 0.005-0.070 weight percent of the dentifrice. The alkaline earth metal may be provided from any water soluble alkaline earth metal salt or as a reaction product of the alkaline earth metal salt with an amorphous silica abrasive and/or thickener.

Abstract: Cordierite ceramic honeycomb structural bodies having a high thermal shock resistance and a high water absorption are produced by adding the defined amount of starch powder, a binder and water to a ceramic starting material to crystallize cordierite upon firing.

Abstract: This invention relates to a process for producing crystallized glass having superior mechanical properties and thermal properties, which comprises (1) coating glass in the form of a powder or molded article with an organometallic polymer, said polymer being soluble in an organic solvent and having a skeleton comprising (a) titanoxane linkages --Ti--O-- or zirconoxane linkages --Zr--O-- or both and (b) siloxane linkages --Si--O-- in which most of the silicon atoms have as a side chain at least one organic group selected from alkyl and phenyl groups, and optionally (c) boroxane linkages --B--O-- or aluminoxane linkages --Al--O-- or both; and (2) firing the resulting polymer-coated glass in an oxidizing atmosphere to crystallize at least a part of the glass. This invention also pertains to a process for producing a ceramics-crystallized glass composite article using the aforesaid crystallized glass.

Abstract: Abrasive grain, corundum (Al.sub.2 O.sub.3) comprising titanium oxide, preferably Ti.sub.2 O.sub.3, is provided with a ceramic coating. The abrasive grain is subjected to a heat treatment whereby the Ti-oxides change from the trivalent into the quadrivalent degree of oxidation. The coating and the change of the degree of oxidation are effected simultaneously.

Abstract: An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy, comprising a grinding wheel comprising a resinoid binding wheel and synthetic diamond abrasive grits held therein, said grits being characterized by selected combinations of grit size, bulk density and grit strength.

Abstract: A wear insert for earth boring tools, such as drill bits, has diamonds imbedded in a sintered matrix of tungsten-carbide and Invar. The matrix prior to sintering has a particle size of from about 0.5 to about 10 microns. Invar represents from about 3% to about 20% by weight of the matrix. The diamonds are arrayed in a desired pattern in a matrix preform; compression of the resultant preform at pressures of from about 10 to about 20 tons per square inch consolidates preform. The consolidated preform is sintered at a temperature just below the melting point of Invar in a neutral atmosphere of nitrogen and hydrogen formed of dissociated ammonia. Nitrogen results in the wetting of the diamonds. Hydrogen presents a reducing atmosphere.

Abstract: Ultrasharp polycrystalline diamond edges, points, and improved diamond composites of predetermined configuration usable as cutting instruments, as high intensity sources for the emission of electrons, ions, neutrons, x-rays, coherent and incoherent light and high frequency electromagnetic radiation, and as ultraprecision molded mechanical and optical parts, or as high field permanent magnets or electrets, are produced by preparing and classifying natural and synthetic ultrafine uniform graphite particles, preferably of the rhombohedral phase, which are directly converted into diamond particles having a particle size of 3 to 100 angstroms, placing the ultrafine powder, either before or after the synthesis, with or without suitable additives, in a diamond mold defining the ultrafine edge or form to be produced, and applying a pressure of the order of 80 to 90 kb, preferably dynamic or static ultrahigh pressures of 100 to about 1000 kb, while heating the powder to a temperature of the order of 2440.degree. K.

Abstract: The invention relates to the polishing of silver-plated, in particular electro-plated silver. The feature of the invention is the provision of a formulation which in the dry, solid state has a high storage life and is free of any toxic components and therefore usable in the home in hotels and in like establishments. The formulation comprises in powdered form at least one silver generating component such as a silver salt or silver oxide and at least one reducing component for the salt or oxide. When water is added to this dry powdered composition to form a paste as needed, and the paste is used on a plated base metal or alloy for cleaning and/or restoration purposes, silver is both deposited and polished by the use of the composition. Different qualities of finish may be obtained depending upon whether the solid formulation also comprises in powdered form either one of the conventional relatively harsh abrasives such as rouge or a very mild agent such as one of the conventional fillers, e.g.

Abstract: In one embodiment, a compact for tools, such as cutting, drilling, wire drawing and shaping tools, consists essentially of a porous mass of self-bonded, boron-doped diamond particles and a catalyst-solvent material. The method for making such a compact comprises the steps of bonding a mass of boron-doped diamond particles, aided by a catalyst-solvent material, under high temperatures and high pressures (HP/HT).In another embodiment, a composite compact, which is made in a similar manner to the first embodiment, consists essentially of (i) a layer of a porous mass of self-bonded, boron-doped diamond particles and catalyst-solvent material; and (ii) a substrate layer of cemented carbide bonded to the diamond layer.

Abstract: A method of making a unitary silicon nitride comprising object and tool is disclosed. A uniform powder mixture of Si.sub.3 N.sub.4 containing SiO.sub.2 as an oxide coating, 4-12% by weight Y.sub.2 O.sub.3, and 0.50-2.5 Al.sub.2 O.sub.3 is prepared. The mixture is hot pressed at a temperature of 1,680.degree.-1,750.degree. C. under a pressure and for a period of time sufficient to produce at least 99.0% (preferably at least 99.5%) of full theoretical density in the mixture to form a pressed object. The heating and pressure is then relieved and the object cooled. The object is heat treated by holding at a temperature in the range of 1,000.degree.-1,400.degree. C. without mechanical pressure for at least 5 minutes but for a time sufficient to provide a nucleating reaction in secondary phases formed as a result of hot pressing. The heat treatment can take place either as an interruption of the cooling cycle or as a subsequent reheat cycle after cooling to room temperature.

Abstract: A method of making a unitary silicon nitride comprising object is disclosed. A uniform powder mixture is prepared of Si.sub.3 N.sub.4 containing SiO.sub.2 as an oxide surface coating, 4-12% by weight Y.sub.2 O.sub.3, and 0.50-2.5% Al.sub.2 O.sub.3. The mixture is heated to 1000.degree.-1400.degree. C. under a pressure of at least 2,000 psi for a time of at least one minute but sufficient to permit a nucleating reaction to take place in secondary phases. Heating is then increased to a temperature of 1680.degree.-1750.degree. C. under a pressure and for a period of time sufficient to produce 99.0% or more of full theoretical density in the pressed object.

Abstract: In grinding disks, toxic lead chloride and antimony sulfide may be replaced by non-toxic alkali metal chloroferrates (II,III) produced by melting together alkali metal chloride, anhydrous ferric chloride and iron powder.

Abstract: An improvement for making polycrystalline compacts containing single crystal diamonds embedded therein is disclosed. Cracking of such compacts is minimized by isolating the diamond in a relatively compressible matrix before exposing the sample to high pressure-high temperature sintering conditions. This may be done, for example, by mixing the diamond crystals with graphite or amorphous carbon powder. Useful devices which can be made from such compacts are cutting tools and wire drawing dies.A sectional view of a wire die blank of this invention is depicted in FIG. 3. One single crystal diamond 12 is embedded in polycrystalline diamond matrix 14 which has been sintered within cemented tungsten carbide ring 16. The wire is drawn through aperture 18. It is felt that this type of die would improve the wire finish while helping to prevent the failure of the single crystal through cleavage. It is useful in drawing wires made of such materials as tungsten, copper coated steel, copper and nickel.

Abstract: An improvement in the manufacture of diamond compacts is disclosed in which a cylindrical mass of polycrystalline diamond is surrounded by and bonded to an outer mass of metal which provides support for the diamond. The improvement comprises the use of seed diamond to grow the polycrystalline mass under high pressure-high temperature (HP/HT) conditions from non-diamond carbon, utilizing a catalyst metal contained in the outer metal annulus. Preferably, this improved process is carried out using a cup-shaped metal mass having a stable carbide content of at least 10% and a coefficient of thermal expansion slightly higher than diamond. It is also preferred to heat the sample (the outer metal mass and the inner graphite mass) directly by passing an electric current through the outer metal mass in the HP/HT process during which the polycrystalline compact is formed.

Abstract: A flexible abrasive member is formed by applying a layer of metal (13;15,16) to mesh material (12). Abrasive material (14) is embedded in the metal layer during the deposition of the layer by an electrodeposition process. The mesh material may be electrically non-conducting woven material and the metal layer is deposited through the mesh material.In making the member the mesh material is laid on a smooth, preferably curvilinear, surface (10) formed with areas (11) for receiving the metal layer. Abrasive material is introduced onto the surface at the beginning of the metal deposition process or towards the end of the deposition process.

Abstract: One or more masses of bonded particles of diamond, cubic boron nitride (CBN), and wurtzite boron nitride (WBN) are sandwiched between or encapsulated by two masses of cemented carbide bonded to the particle masses. In the preferred embodiment, the particle masses are comprised of (1) at least 70% by volume of said particles, and (2) a metallic phase comprised of the cementing agent of the carbide mass. The composite compacts find utility in drill bit, mining tool and wear part applications.A method for making such a composite compact comprises (1) placing within a reaction cell masses of abrasive particles and at least two carbide masses interleaved with the abrasive particle masses, (2) the masses are placed in the cell in such a manner to allow for the accommodation of pressure and (3) simultaneously subjecting the cell and the contents thereof to temperature and pressure conditions at which the particles are stable.

Abstract: Alumina abrasive grains having a density of more than 3.75 g/cm.sup.3 and a hardness (Knoop) higher than 1,900 Kg/mm.sup.2 are disclosed as useful in manufacturing a grinding wheel with which sharp grinding is carried out under heavy loads. The grains are characterized in that the grain structure thereof is constructed of electrofused or high temperature calcined alumina coarse crystal particles and alumina fine crystal particles which are located between said alumina coarse crystal particles, the latter having particle sizes smaller than that of the former and being processed at a calcination temperature lower than that of the former, wherein said fine crystal particles are sintered integrally with said coarse crystal particles. The method of making the grains is also disclosed.

Abstract: The powder mixture consisting of 0.5 to 5 percent by weight of TiN and 99.5 to 95 percent by weight of Al.sub.2 O.sub.3 is first presintered and is subsequently subjected to a hot isostatic pressing so as to produce a sintered product which has the maximum grain size of 2 .mu.m and the hardness of more than H.sub.R A 94.Such sintered product is used as a cutting tool for a high-speed continuous cutting operation.

Abstract: Disclosed is an improved abrasive material particularly useful as a dispersoid in metal matrices to provide articles of use having superior abrasive properties, especially at elevated temperatures. The improved abrasive material typically comprises silicon carbide particulate, the individual particles of which have a predominantly alumina coating thereon to inhibit dissolution of the particles in the metal matrix at high temperatures. The invention finds special application in abrasive blade tips for service in gas turbine engines, the tips comprising a nickel base or cobalt base superalloy having the alumina coated silicon carbide particles dispersed therein.

Abstract: A flowable material, or slurry, comprising a liquid vehicle and solid particulate material dispersed therein which will flow out flat in the form of a sheet. The material, upon exposure to the atmosphere, and either with or without the application of heat, will set up in a dimensionally stable form and can, thereafter, be sintered to form a solid article. The fraction of the vehicle of the composition which remains after the solvent evaporates, vaporizes during sintering and the final product consists only of the particulate material in sintered form.

Abstract: A method of producing electrochemical-abrasive machining tools in which the abrasive body, e.g. a wheel, is impregnated with a chemical plating solution from which a metal is deposited in the interstices of the tool between the abrasive grains. Instead of the usual practice of forcing the chemical plating solution through the tool continuously so that only part of the metal is depleted from the solution, the invention provides for forcing the solution into the interstices and retaining it there for a predetermined time sufficient, preferably, to chemically plate all of the metal from the solution onto the walls of the interstitial spaces of the tool.

Abstract: Composite compacts comprising a cluster of abrasive particles selected from among diamond, cubic boron nitride and wurtzite boron nitride on a support medium, are securely bonded to metal tool parts by a process comprising providing a bond initiator between, and in contact with, a surface of the composite compact and a surface of the tool part, passing a short duration, high electrical current pulse through the contacting surfaces sufficient to cause melting of the bond initiator without raising the temperature of the abrasive particles to their decomposition temperature, forcing the composite compact and tool part together under an applied magnetic force pulse while the bond initiator is molten, and recovering the article.

Abstract: A method of making aggregated diamond abrasive particles comprising forming a mixture of diamond abrasive particles and a powdered metal, heating the mixture to sinter the metal followed by cooling to produce a mass and crushing the mass to obtain the aggregated particles, characterized in that the particles are selected from Types A, B and C, as hereinafter defined, and mixtures thereof:Particles of Type A have the following characteristics:1. A Friatest Index of about 70 to 90 for those particles of size 74 to 88 microns.2. Medium metal content.3. Predominantly translucent color with the occasional transparent white, grey and yellow particle.4. Predominantly blocky shape tending towards elongate particles.5. Predominantly rough and undulating surface.Particles of Type B have the following characteristics:1. Weak, having a Friatest Index of about 65 to 88 for those particles of size 74 to 88 microns.2. A high metal content.3. Predominantly dark in color.4. A blocky and irregular shape.5.

Abstract: A process for producing diamond aggregate abrasive material for resin bonded applications, which process comprises:combining a plurality of seed diamond microcrystallites with a non-diamond carbon nutriment;subjecting the combination, in the presence of at least one metal functionable as catalyst for conversion from non-diamond carbon to diamond, to a pressure-temperature condition within the diamond thermodynamical stability region of carbon phase diagram;maintaining the condition to grow the seed microcrystallites and unite thus grown-up seed crystallites together; andrecovering aggregates thus produced.

Abstract: A segment for use in the manufacture of the working portion of an abrasive tool, e.g. a grinding wheel, comprising needle-shaped abrasive particles such as diamond or cubic boron nitride, each having a long axis and a short transverse axis, held in a bonding matrix, a substantial portion of the particles being so aligned that their long axes are substantially normal to the face of the segment which will provide the working face on the tool. The invention further provides a method of making such a segment and a method of making an abrasive tool utilising such segments in which the bonding matrix is only partially set.

Abstract: The corrosion and staining of unlined aluminum tube surfaces by dentifrices such as toothpastes, particularly when the dentifrices contain therapeutic agents, is substantially prevented by incorporation into the dentifrice of a controlled amount of an alkaline earth metal ion such as calcium ion, in the range of 0.005-0.2 weight percent, and preferably in the range of 0.005-0.070 weight percent of the dentifrice. The alkaline earth metal may be provided from any water soluble alkaline earth metal salt or as a reaction product of the alkaline earth metal salt with an amorphous silica abrasive and/or thickener.

Abstract: A permanent precision liquid polishing suspension, and a method for making same, comprising fine abrasive polishing powders held in a suspension medium comprising an aqueous glycerine based composition thickened by a carboxy polymethylene polymer.

Abstract: A metal abrading material formed from acid etching with a resist pattern comprising a plurality of polygonal shapes with accentuated corners dispersed in a pattern chosen to intermix cutting points with planing edges.

Abstract: A mass of diamond crystals in contact with a mass of eutectiferous silicon-rich alloy and a silicon carbide ceramic substrate are disposed in a container and placed within a pressure transmitting powder medium. Pressure is applied to the powder medium resulting in substantially isostatic pressure being applied to the container and its contents sufficient to dimensionally stabilize the container and its contents. The resulting shaped substantially isostatic system of powder-enveloped container is hot-pressed whereby fluid eutectiferous silicon-rich alloy is produced and infiltrated through the interstices between the diamond crystals and contacts the contacting face of the silicon carbide substrate sufficiently producing, upon cooling, an adherently bonded integral composite.

Abstract: A silver-manganese-zirconium brazing alloy with a high percentage of silver at least exceeding 80 percent is used in a process for fabricating strong, high thermal conductivity bonds between diamond or cubic boron nitride (CBN) and a molybdenum or tungsten support member. Typical diamond or CBN-alloy-metal products with the improved alloy bond are semiconductor device heat sinks, grinding wheels and tools.

Abstract: A grinding and cutting process and articles employing an effective amount of a grinding aid, typical of which is sodium nitrite which, when applied to the abradant or cutting edge of a tool, accelerates the modification of a metal workpiece and prolongs the useful life of the tool. The grinding aids of this invention are compounds free of sulfur and/or halogen and having a melting point in the range of 70.degree. F. to 1000.degree. F., a decomposition temperature at least 100.degree. F. above the melting temperature and a latent heat of melting greater than 10 cal/gm.

Abstract: An etched metal abrasive formed from a laminated sheet of steel having a top layer of high carbon steel and a base layer of low carbon steel.

Abstract: A mass of diamond crystals in contact with a mass of eutectiferous silicon-rich alloy and a silicon nitride ceramic substrate are disposed in a container and placed within a pressure transmitting powder medium. Pressure is applied to the powder medium resulting in substantially isostatic pressure being applied to the container and its contents sufficient to dimensionally stabilize the container and its contents. The resulting shaped substantially isostatic system of powder-enveloped container is hot-pressed whereby fluid eutectiferous silicon-rich alloy is produced and infiltrated through the interstices between the diamond crystals and contacts the contacting face of the silicon nitride substrate sufficiently producing, upon cooling, an adherently bonded integral composite.

Abstract: Improved cutting teeth for etched abrading material and process for etching the abrading material are provided wherein the improved teeth comprise substantially flat top posts having substantially straight or vertical sides. In addition, selected dimensional ratios are maintained between the etched teeth and the thickness of the base material to provide a flexible etching abrasive that has long life and will smoothly and efficiently abrade the surface of an article.

Abstract: A mass of cubic boron nitride (CBN) crystals, aluminum or aluminum alloy and a silicon carbide ceramic substrate are disposed in a container which is placed within a pressure-transmitting powder medium. Pressure ranging from about 20,000 psi to about 200,000 psi is applied to the powder medium resulting in substantially isostatic pressure being applied to the container and its contents. To the resulting shaped substantially-isostatic system of powder-enveloped container, heat and pressure are applied simultaneously whereby the aluminum or aluminum alloy is liquefied and infiltrated through the interstices between the CBN crystals and diffused into the contacting face of the silicon carbide substrate sufficiently to produce, upon cooling, an adherently bonded integral composite.

Abstract: A method of on-the-job installation of a coating having high resistance to wear caused by impact, abrasion, erosion and corrosion and a composition for use in performing the method. The method includes the preparation of a trowelable composition containing high alumina ceramic particles and a co-abrasive filler of smaller particles of inorganic and/or metallic origin in a polymer matrix and the application of this material to the surface to be repaired or protected.