Abstract: In a brief study of the feasibility of welding sintered alpha-SiC, solid-state welding and brazing were investigated Joint quality was determined solely by microstructural examination Hot-pressure welding was shown to be feasible at 1950 C Diffusion welding and brazing were also successful under hot isostatic pressure at 1950 C when boride, carbide, and silicide interlayers were used Furnace brazing was accomplished at 1750 C when a TiSi2 interlayer was introduced

Abstract: Boron-containing transition metal alloys based on one or more of iron, cobalt and nickel, and containing at least two metal components, are characterized by being composed of ultrafine grains of a primary solid-solution phase randomly interspersed with particles of complex borides which are predominantly located at the junctions of at least three grains of the primary solid-solution phase. These alloys are obtained by devitrification of the solid, amorphous state under specific heat-treatment conditions. These alloys can be consolidated into three-dimensional bodies.

Abstract: A zinc-plated steel strip having enhanced corrosion resistance, workability, and weldability comprising a steel strip substrate, at least one surface coating layer formed on at least a portion of the substrate surface, and, optionally, at least an intermediate coating layer formed between the substrate and the surface coating layer and consisting of zinc or a zinc alloy, the surface coating layer consisting essentially of a zinc or zinc alloy matrix and fine dispersoid particles dispersed in the matrix and consisting an oxide, carbide, nitride, boride, phosphide, or sulfide of AI, Fe, Ti, Mo, Cu, Zn, Ni, Co, La, Ce, or Si.

Abstract: The crystals of a new boride Cr2B3 have been prepared from high temperature Al-Cr-B melts, and the optimum conditions for obtaining the single crystals of this compound in a pure form containing no extra phases were examined. The crystals are orthorhombic with space group either Cmcm, C2cm or Cmc21 and lattice constants a = 3.027(1) A , b = 18.119(1) A , c = 2.954(1) A . The Vickers microhardness measured in the {010} planes is in the range 2110 – 2450 kg mm−2. The oxidation of the crystals in air is examined by thermogravimetric and differential thermal analyses up to 1250 °C.

Abstract: High density composites consisting of graphite and metal borides by pressing blended powders of pitch-free coke and boride powder. The pressing may be hot pressing at temperatures of about 2200° C. and pressure of about 1500 psi or cold pressing at about room temperature followed by high temperature sintering. Some of the boron from the boride diffuses substitutionally into the structure at the processing temperatures promoting graphitization; whereby densification and bonding the resulting degree of graphitization of the shapes is comparable to that of conventional graphite articles processed at temperatures in excess of 2800° C. The mechanical strength of these composites is equivalent to and often exceeds the strength of conventional graphites and the oxidation resistance in dry air is much superior at temperatures as high as 800° C. Overall processing time is reduced from months to days thus improving the economics of the process.

Abstract: Refractory borides or carbides are prepared by contacting an alkali-metal ducible metal chloride or silicon tetrachloride with boron trichloride or carbon tetrachloride in an inert solvent in the presence of an alkali metal, the metal chloride or silicon tetrachloride and the boron trichloride or carbon tetrachloride being present in an amount about stoichiometrically equivalent to the boride or carbide to be prepared and the alkali metal being present in an amount about stoichiometrically equivalent to the amount of chloride in the metal chloride or silicon tetrachloride and the boron trichloride or carbon tetrachloride, until all chloride present has reacted with the alkali metal to form alkali metal chloride, separating the inert solvent to leave a solid residue containing a metal boride, silicon carbide or metal carbide precursor together with the alkali metal chloride, and calcining the residue while separating the alkali metal chloride until the precursor is converted to the refractory boride or carbide.

Abstract: Novel methods of bonding solid carbide, boride, nitride, silicide or sulfide bodies are disclosed which comprise the laminating of mixtures of selected precursors between portions of those bodies to form intermediate laminates which are then heated to initiate exothermic joining reactions. Using these methods it is possible to produce end products from difficult to join materials. The methods are particularly useful for joining TiB 2 /Al composite materials to form current collectors for Hall-Heroult cells, and for other arplications.

Abstract: A process for the preparation of boron carbide/transition metal boride mod articles comprising hot pressing a mixture of from 25 to 75% by weight of boron carbide, from 15 to 40% by weight of boron, from 0 to 8% by weight of silicon, from 10 to 50% by weight of tungsten and/or titanium carbide, and from 0 to 6% by weight of cobalt.

Abstract: Ceramic body formed by reaction sintering at pressures ranging from subatmospheric to superatmospheric of admixed and shaped reactants, which can be elements, compounds, intermetallic compounds and/or alloys, in stoichiometric proportions to substantially form 10-90 mole percent of boride phase or phases of one or more of elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and 10-90 mole percent of oxide phase or phases of one or more of elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8, and which phases have a maximum grain size substantially not greater than 15 μm. Body in a form for wear resistance and corrosion-erosion resistance has a virtual absence of open porosity, e.g. not greater than 5% or less than about 3%, and a Rockwell A hardness of greater than 90.

Abstract: Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-metal borides showing a friction coefficient of 0.01 to 0.09 and a specific amount of abrasion of 1.0 to 4.0×10 -8 mm 2 /kg under the measuring conditions of a load of 20 kg/cm 2 and a sliding velocity of 5 m/min at an atmosphere temperature of 300° C., a bending strength of 230 to 900 kg.f/cm 2 and a Shore hardness of 28 to 45, produced by sintering (a) 70 to 93% by weight of amorphous carbon powder, (b) 5 to 20% by weight of at least one boride of a metal of IVa group, Va group of VIa group of the periodic table and (c) 2 to 10% by weight of powdery natural graphite, powdery Kish graphite or a mixture thereof.

Abstract: 1. The characteristic boride phases in multi-alloyed nickel-base alloys are M3B2 and M5B3. 2. The type of boride phase is determined by the chromium, molybdenum, and tungsten content in the alloy. 3. In alloys in which borides of two types are observed a type M5B3→M3B2 boride reaction is possible during heat treatment and subsequent aging.

Abstract: Using optical and electron metallography, the composition, morphology, and distribution of M3B2 borides in as–hipped (hot isostatically pressed) samples of the powder metallurgy superalloy Nimonic AP1 have been determined. Two types of boride are present depending on the HIP temperature. Hipping below the boride solvus results in low–aspect ratio particles, distributed both inter– and intragranularly. Hipping above the boride solvus produces high–aspect ratio particles which are exclusively intergranular. A small difference in both lattice parameter and composition has been measured. Electron energy loss spectroscopy of the particles has confirmed the presence of boron, and laser ion–induced mass analysis has indicated a low carbon level. The higher susceptibility to edge cracking during forging of material hipped above the boride solvus is related to the boride morphology. Studies of the subsequent recrystallization of the forged samples have indicated that necklace formation is neither inhibited...

Abstract: PURPOSE:To obtain an Al alloy having superior heat resistance, wear resistance and lubricity by adding oxide, carbide, boride, nitride or carbon to an Al alloy having a specified composition, melting the alloy, and rapidly cooling the molten alloy. CONSTITUTION:An Al alloy consisting of, by weight, 0 =about 10 deg.C/sec rate to obtain the desired Al alloy in the form of a ribbon, powder or flakes. The Al alloy can be formed into an article by sintering, extrusion, hot pressing or hot hydrostatic pressing, and it is most suitable for use as a material for various machine parts.

Abstract: PURPOSE:To produce a titled composite sintered structural body having excellent hardness, mechanical strength and toughness by mixing cubic BN powder, cermet powder consisting of ceramics and metal and Al powder at a specific ratio and sintering the mixture under adequate conditions. CONSTITUTION:A powder mixture consisting of 40-80wt% cubic BN particle powder, 52-10% cermet particle powder which is a sintered alloy consisting of ceramics of carbide, boride, nitride, silicide, etc. and metal of >=1 kind among Ni, Co, Cr and Si and 8-10% Al particle powder is used as a raw material for sintering. Such powder mixture is subjected to hot press sintering under the conditions of 1,100-1,250 deg.C sintering temp. and 20,000-30,000kg/cm sintering pressure. Then the Al powder melts to fill the gaps among the particles and at the same time the cubic BN particles and the metallic parts of the cermet particles are subjected to liquid phase sintering. The composite sintered structural body consisting of the cubic BN and cermet is thus obtd. at a low cost.

Abstract: Small single crystals of RRh 4 B 4 compounds where R = Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y have been prepared by precipitation from a molten copper flux. Measurements of the low frequency ac electrical resistance R are reported with particular emphasis on the behavior of R for temperatures T less than the magnetic ordering temperature. The upper critical magnetic field of ErRh 4 B 4 determined from R ( T ) measurements in applied magnetic fields is presented for parallel and perpendicular orientations of the tetragonal c -axis of the sample with respect to the applied magnetic field. Comparisons are made with previous work on polycrystalline samples of all the compounds as well as single crystals of ErRh 4 B 4 .

Abstract: PURPOSE:To provide a surface hardened Ag alloy member having high surface hardness and excellent resistance to corrosion by forming a surface hardened layer constituted of manganese boride which is hard and highly resistant to corrosion on the surface of an Ag alloy member contg Mn at a specified rate CONSTITUTION:A surface hardened Ag alloy member having excellent resistance to wear and corrosion is constituted by forming a surface hardened layer consisting essentially of manganese boride on the surface of an Ag alloy member contg 05-35wt% Mn and consisting of the balance Ag and unavoidable impurities If necessary, >=1 kind among 05-35% Cu, 01-10% Cr, 01-10% Fe, 01-10% Ni, 01-10% Co, 01-5% Zn and 01-5% Cd by weight can be further incorporated into said Ag alloy member Since the surface hardened Ag alloy member has the above-mentioned characteristic, the member exhibits excellent resistance to wear and corrosion and can maintain the beautiful surface characteristic for an extremely long period of time when said alloy is applied for ornaments, vessels and further as a member for electrical parts, etc

Abstract: PURPOSE:To produce a ceramic-metal composite body having excellent resistance to thermal impact by coating a metal having specific porosity around a ceramic core material and converging said metal to an oxide, nitride, carbide, silicide, boride, sulfide, etc. then subjecting the same to insert-casting into a metal. CONSTITUTION:A metal such as Al, Zr, Si, Cr, Ti, Mo, etc. is thermally sprayed by gaseous acetylene/oxygen onto the surface of a core material 1 made of ceramics such as alumina, zirconia, magnesia silicate, silicon nitride, titanium silicide, Sialon, etc. or the material 1 is enveloped by said metallic powder and is sintered to form a metallic layer having 5-85% porosity to about 0.5mm. thickness. Such porous metallic layer is chemically treated to form a metallic compd. layer 11 composed of one or >=2 kinds among the oxide, nitride, carbide, silicide, boride and sulfide of said metal. The core material is then put into a casting mold and a molten metal such as ''Inconel'' or the like is poured into the mold to form insert-casting layers 2, 3 having respectively about 5mm. wall thickness. The composite body which obviates cracking of the ceramic core material 1 by thermal impact is obtd.

Abstract: 1. A process of producing porous filter bodies from metal powder, which is heated to a sintering temperature and sintered in a mould or as a moulded compact and an oxygenfree boron compound in the form of a powder is bonded at least to those powder particles which have an oxide layer before the metal powder is introduced into the mould or before the metal powder is compression-moulded, characterized in that an oxygenfree boron compound consisting of boron nitride or of a boride in a quantity amounting to 1 % by weight, at most, is admixed to the metal powder and the mixed powders are then sintered at a temperature in degree C between T1 = 950 + 450 d**1/2 - 150 g and T2 = 1 100 + 450 d**1/2 - 150 g where boron nitride is used and between T1' = 1 080 + 250 d**1/2 - 250 g and T2' = 1 200 + 250 d**1/2 - 250 g if a boride is used, wherein d is the average particle size of the metal powder in millimetres and g is the quantity in which the oxygen-free boron compound is added in % by weight.

Abstract: Protective coatings are applied to substrate metals by coating the metal surface, e.g. by dipping the substrate metal (10) in a molten alloy of the coating metals, and then exposing the coating at an elevated temperature to an atmosphere containing a reactive gaseous species which forms an oxide, a nitride, a carbide, a boride or a silicide (13). The coating material is a mixture of the metals M1 and M2 of which M1 forms a stable oxide, nitride, carbide, boride or silicide (13) under the prevailing conditions and of which M2 (12) does not form a stable oxide, nitride, carbide, a boride or silicide. M2 (12) serves to bond the oxide, etc. of M1 (13) to the substrate metal (10). Mixtures of M1 and/or M2 metals may be employed. This method is much easier to carry out than prior methods.

Abstract: PURPOSE:To obtain a high-strength sintered hard material with superior wear resistance, corrosion resistance and heat resistance by adding a mixture of powder of a composite boride consisting of B, Mo and Fe, Co, Ni or the like with TiH2 powder as a binding material to TiB2 powder as a hard material and by carrying out sintering CONSTITUTION:To hard TiB2 powder of =100kg/cm pressure in vacuum or an inert gaseous atmosphere A green compact of the mixture may be sintered at 1,700-2,000 degC and hot-pressed under hydrostatic pressure

Abstract: PURPOSE:To develop a Cu alloy member having a surface hardened layer which has excellent thermal and electrical conductivities and excellent toughness, corrosion resistance and wear resistance by diffusing and penetrating boride of Cr and Al into the surface of a high-strength Cu alloy consisting of Cu-Cr CONSTITUTION:Al is first diffused and penetrated into the surface of a high- strength Cu alloy member contg 02-15% Cr or further 0003-025% P and 001-15% Zr respectively independently or in combination, then Cr and finally B are diffused and penetrated therein Or Al and Cr are simultaneously diffused and penetrated, then B is diffused and penetrated or after Al is first diffused and penetrated, Cr and B are simultaneously diffused and penetrated The Cu alloy having the body heating excellent strength and excellent conductivity to heat and electricity intrinsic thereto and the boride layer of Cr and Al having excellent toughness, corrosion resistance and wear resistance is obtd by such treatment

Abstract: PURPOSE:The titled electrodeposition coating material, containing a nitride, carbide or boride of a ceramic having a specified specific resistance or below, having a very low variation in film thickness, and improved safety, nonpollution and economic efficiency, and suitable to highly electrically conductive films. CONSTITUTION:An electrodeposition coating material obtained by incorporating 100pts.wt. solid of a binder resin, e.g. a cationic or anionic resin, in an electrically conductive electrodeposition coating material, with preferably 50-400pts.wt. one or more of a nitride, e.g. TiN, carbide, e.g. NbC, and boride, e.g. WB, of a ceramic having OMEGA.cm specific resistance and preferably <=5mu particle diameter.

Abstract: PURPOSE:To selectively and partially modify a sintered alloy so as to make anti- wear property, impact resistance and coagulation resistance excellent, in a sintered alloy having a surface bonding phase such as a tool, by securing a substance having strength higher than that of the bonding phase and an inert substance to said surface bonding phase part CONSTITUTION:A sintered alloy for a cutting tool is formed of a hard phase comprising one or more of carbide, nitride, boride, silicide and oxide of a metal belonging to the Groups 4a, 5a, 6a or a mutual solid solution thereof, and a bonding phase comprising one or more of Co, Ni, Fe, Mo, Cr or W A substance having hardness higher than that of the bonding phase and an inert substance are secured to the bonding phase part present in the surface layer of said sintered alloy by an ion injection method or a mechanical method to selectively and partially modify the surface of the sintered alloy The substance to be secured is selected from high density boron nitride, boron carbide, silicon nitride, silicon carbide, aluminum oxide and aluminum nitride

Abstract: PURPOSE:To produce a vane which stirs a molten metal of a high temp by compounding a specific amt of ceramics powder with coke powder, sintering the powder mixture and forming a composite carbon-ceramics material having specific bending strength CONSTITUTION:A composite carbon-ceramics material having >=200kg/cm bending strength is prepd by compounding 10-50vol% ceramics powder with coke powder and sintering the powder mixture in an about 1,000-2,300 degC range under pressure or atm pressure Only the boron carbide is used or the boron carbide and further >=1 kind selected from carbide such as silicon carbide, boride such as titanium boride and oxide such as aluminum oxide are used as the ceramics powder The vane obtd by using such composite material withstands substantially stirring of a molten metal having a high temp of about 300-1,200 degC

Abstract: PURPOSE: To obtain a lightweight and heat resistant coating having superior heat insulation, thermal shock resistance, airtightness and mechanical strength by thermal spraying powder of a sublimable material such as a carbide, nitride or boride and oxide powder on the surface of a substrate to form a porous coating. CONSTITUTION: Powder of a carbide, nitride or boride sublimable readily during thermal spraying such as Si 3 N 4 , SiC or BN is mixed with powder of an oxide such as Al 2 O 3 or stabilized ZrO 2 . This powdery mixture is thermally sprayed on the surface of a heat resistant alloy substrate to form a thermally sprayed porous layer. By this method, a lightweight and heat resistant coating having a long service life can be formed. COPYRIGHT: (C)1986,JPO&Japio

Abstract: PURPOSE:To improve machining property and durability against abration by combining stabilized zirconia and a boride of transition elements of IV-a, V-a, VI-a groups. CONSTITUTION:A principal component of 95-50vol% consisting of 80-94mol% ZrO2 and 6-20mol% Y2O3 is added with one or more borides of transition elements of IV-a, V-a, VI-a groups except TiB2 of 5-50vol% and 1-5wt% of these total quantity aluminum oxide as a sintering assistant. For example, a substrate for thin film magnetic head is manufactured by hotpressing the above- mentioned composite material at 1,400-1,600 deg.C. If the content of the above- mentioned boride is 5vol% or less, it is not effective as a composite material and if the content is 50vol% or more, the hardness and the durability against abration are good but the sliding characteristic of stabilized zirconia is lost.