Abstract: PURPOSE:To obtain the title capacitor having very small change in the value after leaving it at high temperature against the initial value of leakage current characteristics and also having excellent heat resisting property by a method wherein a coating material, consisting of vinyl resin material containing particulates of an inorganic substance or an inorganic compound, is firmly formed on the circumference of a capacitor element consisting of a valve-acting metal sintered body. CONSTITUTION:A coating material consist of vinyl resin containing particulates of inorganic substance or inorganic compound. Flakelike or spherical material is preferable as the particulates of inorganic substance or inorganic compound, and its average grain diameter is 30mum or smaller. As the inorganic substance, the metalloid such as carbon, boron, silicon and the like are used, and as the inorganic compound, the oxide such as silica and the like, the nitride such as silicon nitride and the like, the carbide such as silicon carbide and the like, the boride such as zirconium boride and the like are used. Then, the vinyl fundamental resin such as vinyl chloride resin, polyvinyl acetate resin and the like are used as resin. Pertaining to the compounding ratio of the particulates and the resin, the quantity of the particulates is set at 10 to 99%. The coating material, formed by compounding the above- mentioned material, is adhered entirely to a tantalum capacitor element as the prime coating resin, it is hardened by heating, and an outer covering is provided using epoxy resin.

Abstract: A dispersion strengthened Cu (copper)-base alloy for a wear-resistant overlay formed on a metal substrate consists essentially of, by weight %, Ni: 5 to 30%; B: 0.5 to 3%; Si: 1 to 5%; Fe: 4 to 30%; Sn: 3 to 15% and/or An: 3 to 30%; and the remainder being Cu and unavoidable impurities, and has a structure in which particles of boride and silicide of the Fe-Ni system are dispersed in a Cu-base matrix, and Cu-base primary crystals contain Sn and/or Zn in a solid solution state. If necessary, 0.1 to 5% of Al, 0.1 to 5% of Ti, and/or 1 to 10% of Mn may be added. 0.02 to 2% of C, and 0.1 to 10% of Cr and/or 0.3 to 5% of Ti may be further added. Instead of or along with Sn and/or Zn, 2 to 20% of Pb can be used, and nonsoluble Pb particles are uniformly dispersed between Cu-base α phase dendrites and serve as a solid lubricant.

Abstract: A TiAl alloy base melt including at least one of Cr, C, Ga, Mo, Mn, Nb, Ni Si, Ta, V and W and at least about 0.5 volume % boride dispersoids is investment cast to form a crack-free, net or near-net shape article having a gamma TiAl intermetallic-containing matrix with a grain size of about 10 to about 250 microns as a result of the presence of the boride dispersoids in the melt. As hot isostatically pressed and heat treated to provide an equiaxed grain structure, the article exhibits improved strength.

Abstract: This invention relates generally to a novel method of preparing self-­supporting bodies and to the novel products made thereby. In its more specific aspects, this invention relates to a method of producing self-­supporting bodies comprising one or more boron-containing compounds, e.g., a boride or a boride and a carbide, by reacting, in one embodiment, a powdered parent metal, in molten form, with a bed or mass comprising a boron carbide material and, optionally, one or more inert fillers, to form the body. In another embodiment, both of a powdered parent metal and a body or pool of molten parent metal are induced to react with a bed or mass comprising a boron carbide material, and, optionally, one or more inert fillers.

Abstract: The present invention provides a diamond coated sintered body characterized by having a diamond film formed by a gas phase synthesis method on the surface of a sintered body obtained from a mixture of tungsten carbide and at least one compound selected from the group consisting of carbide and nitride of silicon or boron and, if necessary, additionally at least one compound selected from the group consisting of carbide, oxide, nitride, carbonitride, carbonate, boride and organic compound of at least one element selected from the group consisting of metals and rare earth elements belonging to Groups Ia, IIa, IIIa, IVa, Va, IIIb and IVb of the Mendelejeff's periodic table

Abstract: Disclosed are coated metal articles having protective coatings which are applied to substrate metals by coating the metal surface, e.g. by dipping the substrate metal 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. The coating material is a mixture of the metals M 1 and M 2 , M 1 being zirconium and/or titanium, which forms a stable oxide, nitride, carbide, boride or silicide under the prevailing conditions. The metal M 2 does not form a stable oxide, nitride, carbide, boride or silicide. M 2 serves to bond the oxide, etc. of M 1 to the substrate metal. Mixtures of M 1 and/or M 2 metals may be employed. Eutectic alloys of M 1 and M 2 which melt substantially lower than the melting point of the substrate metal are preferred.

Abstract: Disclosed is an Al-Ti-B master alloy especially designed to grain refine cast aluminum alloys containing silicon. The alloy composition goes contrary to present known art. Present commerical master alloys contain a ratio of Ti to B exceeding 2.2 to promote a mixture of TiB2 and TiAl3 crystals. This invention provides an Al-Ti-B alloy wherein the Ti to B ratio is 1. It contains a preponderance of mixed boride crystals. The optimum composition of the alloy of this invention is Al-3Ti-3B.

Abstract: The distribution of boron in 10 p.p.m. B-doped Fe-30 wt% Ni austenitic alloy was investigated by means of particle tracking autoradiography (PTA). It was shown that when quenched from a certain temperature between 750° C and 1220° C with medium cooling rates, both equilibrium and non-equilibrium grain boundary segregation of boron appeared in the alloy. The degree of segregation represented the sum of the two kinds of segregation of boron. A transition temperature, of approximately 950° C, was found below which the equilibrium grain-boundary segregation was dominant and above which the non-equilibrium grainboundary segregation was dominant. For the degree of segregation achieved by these two types of segregation of boron there exists a temperature from 1000° C to 1050° C at which a minimum amount of segregation is obtained. It was also shown that non-equilibrium segregation of boron can considerably promote the precipitation of boride at grain boundaries.

Abstract: This invention relates generally to a novel method of manufacturing a composite body and to novel products made thereby. More particularly, the invention relates to a method of producing a self-supporting body comprising one or more boron-containing compounds, e.g., a boride or a boride and carbide, by reactive infiltration of molten parent metal into a bed or mass containing boron carbide, and, optionally, one or more inert fillers and permitting residual or excess parent metal, to remain bonded to the formed self-supporting body. Excess metal is used to form a bond between the reactively infiltrated body and another body (e.g., a metal or a ceramic body).

Abstract: A wear-resistant member formed comprises a sintered ceramic body essentially consisting of 0.1 to 15% by weight of at least one material selected from the group comprising molybdenum carbide, niobium carbide, hafnium carbide, tantalum carbide, tungsten carbide, molybdenum silicide, niobium silicide, hafnium silicide, tantalum silicide, tungsten silicide, molybdenum boride, niobium boride, hafnium boride, tantalum boride, and tungsten boride, 2 to 20% by weight of a boundary phase selected from the group consisting of Si--Y--Al--O--N and Si--Y--Al--O--N--B, and a balance of β-silicon nitride. The wear-resistant member preferably has a metal member bonded to the sintered ceramic body. The wear-resistant member can perform high-load work such as high-speed cutting.

Abstract: The structure of the new boride Ta5B6 has been determined and refined using single-crystal X-ray diffraction techniques. The structure is described in the space group Cmmm with a = 22.602(8) A , b = 3.1385(7) A and c = 3.2895(4) A . The refinement is based on 408 non-equivalent reflections and the final, conventional R value for these reflections is 2.34%. The structure is of the V5B6 type. The present structure refinement is the first single-crystal study of a phase crystallizing in the V5B6-type structure.

Abstract: A capacitor which includes a dielectric layer, a metal electrode and a capacity adjusting electrode erodable by exposure to light energy, the capacity adjusting electrode being a film made of at least one selected from metallic oxides, metallic nitride and metallic boride.

Abstract: A method for forming a dense metal boride composite article having a predetermined shape in which the method comprises blending a metal boride and a nitride to form a mixture of particles, milling the particles to a desired size, coating the particles with a lubricant formed from a polyvinyl acetate, cold forming the particles into an article of desired shape and pressureless sintering the cold formed article.

Abstract: Nickel-based metallic glass powder has been successfully consolidated using high energy, high rate (HEHR) processing. Processing involved compaction pressures of 250–400 MPa and electrical energy densities of 1830–2460 J g −1 . Over 95% of the energy was deposited in less than 1 s. Consolidates were structurally inhomogenous, with fine borides near the surface and coarse borides in a central sample nugget zone. Microhardness tests correlated with boride particle size. All compacts crystallized during HEHR consolidation, forming a fine NiMoFe f.c.c. solid solution, Mo 2 NiB 2 and, in some cases, a CuPt-type structure of unidentified composition. The thermal stability of HEHR processed consolidates was assessed by annealing for up to 100 h at 650°C. New phases appeared, including Ni 2 Mo, M 23 C 6 -type boride and M 6 C-type boride. On monotonic heating, the crystallization sequence for Ni 56.5 Mo 23.5 Fe 10 B 10 was determined to be amorphous phase→ phase separation → glass transition of a high temperature amorphous phase → partial crystallization of the NiMoFe f.c.c. solid solution → complete crystallization (Mo 2 NiB 2 ). The activation energy for the low temperature crystallization, 290 kJ mol −1 , equals the interdiffusion value for molybdenum in nickel. The activation energy for the high temperature crystallization, 390 kJ mol −1 , compares favorably with the activation energy for molybdenum self-diffusion. Two peaks on the HEHR power curves during processing are interpreted to reflect changes in powder resistivity associated with the crystallization events.

Abstract: The subject invention relates to a coated reinforcement material comprising a SiC-based reinforcement having a rare earth boride coating preferably of the general formula: R.sub.x B.sub.1-x wherein R is selected from the group consisting of Y, Sc, Gd, Tb, Dy, Ho, Er and combinations thereof; and x is from about 0.05 to about 0.66. The invention further relates to a high strength, high temperature performance composite comprising a SiC-based reinforcement material having a coating comprising a rare earth boride, said coated reinforcement material disposed in a metal matrix material.

Abstract: PURPOSE: To improve the service life of a member and the quality of a hot-dip galvanized steel sheet to be obtained by using a Zn bath containing prescribed percentages of Al and a member coated with a thermal spraying material of cermet or boride at the time of applying hot-dip galvanizing to a steel material. CONSTITUTION: A thermal spraying material of cermet or a thermal spraying material of boride, such as TiB 2 and ZrB 2 , is thermally sprayed on a steel material, by which a member coated with sprayed deposit for use in hot-dip galvanizing, e.g. a roll can be obtained. The above thermal spraying material of cermet can be formed by incorporating metal components, such as Co, Ni, and Ni-Cr, into carbides, such as Cr 2 C 3 , TiC, ZrC, WC, WTiC, B 4 C, and NbC. At the time of using the above member with sprayed deposit for galvanizing, a molten Zn bath containing Al by 0.01-10wt.% is used. COPYRIGHT: (C)1992,JPO&Japio

Abstract: PURPOSE:To prevent the generation of a crack in the moldings by heat-treating granulated particles in an oxidizing atmosphere and removing the binder for granulation prior to the molding of the granulated particles. CONSTITUTION:For example, in the case of manufacturing a sintered body suitable for the base of heater for heating the wafer of semiconductor, a carbide, nitride and boride of a metal and more than on kind of metals are added and mixed into the particles of silicon nitride raw material. Into this mixed particles, a granulation binder is added and granulated and heated in an oxidizing atmosphere and the granulation binder is removed. The granulated powder post heat treatment is molded and the molded body is sintered. By this means, since the oxidations of carbide, nitride and boride of the metal together with the metals can be proceeded previously, the generation of crack caused by the volume expansion is prevented even if the molding of the granulated particles and the operation of the heat treatment in the oxidizing atmosphere are executed.

Abstract: of EP0423996Silicon carbide filaments (31) are coated to protect them from attack by a titanium matrix material when incorporating them into a metal matrix composite. The coating method comprises coating the filaments firstly with a carbon layer (32) and then with a titanium carbide or boride layer (33) whose carbon or boron content decreases progressively from its interface with the carbon layer to its exterior surface. A layer of titanium or a titanium based alloy (34) may be provided on the titanium carbide or boride layer (33) to facilitate incorporation into a metal matrix. Preferably, the layers (32-34) are applied by sputter ion plating.

Abstract: Methods for selectively forming titanium silicide and titanium boride by vapor phase reaction of titanium chloride precursors with silicon or boron substrate surfaces are examined. By passing TiCl 4 through a heated chamber packed with titanium metal turnings within the reactor tube, a reduced titanium halide is generated. It was found that the silicide or boride formation in the reactor can thus be controlled at a much lower temperature. Characterization of the resulting films was conducted by use of scanning and transmission electron microscopy, sheet resistance measurements, and x-ray diffraction

Abstract: PURPOSE:To improve calcinability and readily enable obtaining of a high-density calcined compact having a high strength at high temperatures, etc., by providing a coating layer composed of one of metal carbide, nitride and boride formed by dipping on the surface of hardly calcinable powder. CONSTITUTION:Hardly calcinable powder, e.g. diamond, boron nitride, silicon carbide, zirconium boride or boron carbide, is dipped in a molten salt bath prepared by blending a molten halide containing at least a fluoride with the objective coating metal component, preferably a bath composed of an alkali metal chloride-alkaline earth metal chloride-alkaline earth metal fluoride to initiate disproportionation reaction on the surface of the hardly calcinable powder and form a nearly amorphous coating layer of the metal carbide, nitride, boride, etc., rich in activity. The resultant coated powder is then calcined by a dynamic or static ultrahigh pressure method to afford a calcined compact, which is subsequently bound with a binder to provide abrasive grains, grindstones, etc.

Abstract: Process for production of a ceramic material, e.g. a carbide, nitride, boride or silicide, by reacting at least one compound of a metallic or non-metallic element having two or more groups reactive with hydroxyl groups with at least one organic compound having two or more hydroxyl groups to form an oxygen-containing polymeric product, heating the polymeric product to produce a coked product containing carbon and an oxide of the metallic or non-metallic element, and heating the coked product to produce a ceramic material, in which the proportion by weight of carbon to the oxide of the metallic or non-metallic element in the coked product is in the range from 50% to 150% of the proportion which is theoretically required to produce the ceramic material.

Abstract: This invention relates generally to a novel method of preparing self-supporting bodies, and to novel products made thereby. In its more specific aspects, this invention relates to a method of producing self-supporting bodies comprising one or more boron-containing compounds, e.g., a boride or a boride and a carbide, by reactive infiltration of a molten parent metal actinide into (1) a bed or mass containing boron carbide and, optionally, (2) at least one of a boron donor material (i.e., a boron-containing material) and a carbon donor material (i.e., a carbon-containing material), (3) a bed or mass comprising a mixture of a boron donor material and a carbon donor material and, optionally, (4) one or more inert fillers in any of the above masses, to form the body.

Abstract: Boron ions are universally used as a p‐type dopant for ion implantation of silicon wafers. In today’s technology, ions are produced from gases in a hot filament magnetron plasma, known as the Freeman ion source, using BF3 as a feedstock. Two problems are that the hot filament corrodes in the fluoride environment and the BF3 is quite toxic. In order to overcome these limitations, we have developed a cold cathode magnetron source which uses a conductive boride cathode liner (B4C and B6Si have been used successfully), and a nontoxic gas feed (such as CF4 or SF6), which produces boron ion fraction yields as high as 15% in beam extraction experiments performed on a low voltage ion source test stand. This is comparable to the performance obtained using a Freeman source and BF3 feed gas.

Abstract: PROBLEM TO BE SOLVED: To lengthen the service life of a discharge tube by preventing clouding of a light projecting part of the discharge tube by restraining evaporation of alkaline metal being an electron emitting material at high output operation time by constituting a cathode by pressurizing/sintering it by mixing high melting point powder being the electron emitting material by wt.% of a specific range with high melting point metallic powder. SOLUTION: A cathode support part 3 composed of high melting point metal such as molybdenum and tungsten is fixed by sintering/forming it after pressurization/molding by being uniformly mixed in a 5 to 50 wt.% range at a mixing rate of tungsten boride 1 to high melting point metal. Therefore, the cathode service life can be lengthened by restraining evaporation because of lowness of vapor pressure of the tungsten boricle 1 being an electron emitting material, and reduction in the cathode service life by the fluctuation of an arc can also be prevented without strengthening ion bombardment to a cathode tip part to a degree of melting/recrystallizing the tip by local heating because the tungsten boride 1 existing in the cathode tip part has a comparatively low work function in high melting point metal.