Abstract: A process for manufacturing SiC-based ceramic precursors by curing a polycarbosilane shaped body while it is in contact with vapor of at least one hydrocarbon selected from the group consisting of halogenated hydrocarbons and unsaturated hydrocarbons of ethylene series and acetylene series. This process can cure polycarbosilane shaped bodies without introducing oxygen thereinto and requires no special apparatuses. The obtained precursor is suited for synthesizing SiC-based ceramics efficiently without deteriorating characteristics thereof, particularly excellent in high-temperature strength.

Abstract: An organic silazane polymer is prepared by passing a silazane compound in por form through a hollow tube heated at 400.degree. to 700.degree. C. for activation and thermally polymerizing the silazane compound in a liquid phase. Inorganic fibers can be prepared from the organic silazane polymer by melt spinning, infusibilizing, and sintering. An apparatus for preparing an organic silazane polymer is also provided, comprising a heated reactor vessel for evaporating and thermally polymerizing a silazane compound, a heated hollow tube in flow communication with said reactor vessel for receiving the silazane compound vapor and heating it at 400.degree. to 700.degree. C. for activation, and a conduit, with a condenser for condensing the vapor, for feeding the condensed silazane compound back to the reactor.

Abstract: The invention relates to an organopolyarylsilane which comprises aromatic ring segments having a skelton mainly comprising an aromatic condensed ring structure derived from an organic solvent soluble pitch and organosilane segments randomly bonded thereto with an Si--C linkage intervening therebetween and is soluble in an organic solvent, and further relates to an SiC--C based continuous inorganic fiber exhibiting excellent heat resistant strength, oxidation resistance and electro-conductivity, which is obtained by spinning the above organopolyarylsilane into fiber, and after infusibilizing, heat-treating said fiber under a nonreactive atmosphere at a high temperature. The above organopolyarylsilane can be efficiently obtained in extremely high yields, by a process wherein low boiling substances produced by pyrolysis of the starting material, i.e.

Abstract: A molded product consisting mainly of silicon carbide and a process for mfacturing the same. This invention is to provide a product having a desired or complicated shape and a process which enables the manufacture of any such product at a drastically lower temperature than any conventional process. This object is attained by applying an organic silicon polymer having a skeleton composed mainly of carbon-silicon bonds by impregnation or adherence to a base material having a desired shape, and by burning the base material at a temperature of 700.degree. C. to 2,000.degree. C. in a vacuum or in a nonoxidizing gas atmosphere. The product of this invention has a fibrous, granular and/or firmly carbon structure in the matrix consisting mainly of SiC. The product of this invention is useful for a wide variety of applications, for example, for making heat-resistant structural members of electronic devices.

Abstract: A molded product consisting mainly of silicon carbide and a process for mfacturing the same. This invention is to provide a product having a desired or complicated shape and a process which enables the manufacture of any such product at a drastically lower temperature than any conventional process. This object is attained by applying an organic silicon polymer having a skeleton composed mainly of carbon-silicon bonds by impregnation or adherence to a base material having a desired shape, and by burning the base material at a temperature of 700.degree. C. to 2,000.degree. C. in a vacuum or in a nonoxidizing gas atmosphere. The product of this invention has a fibrous, granular and/or filmy carbon structure in the matrix consisting mainly of SiC. The product of this invention is useful for a wide variety of applications, for example, for making heat-resistant structural members of electronic devices.

Abstract: An organosilicon polymer whose main-chain skeleton is composed mainly of following structural units (A), (B), (C), (D), (E) and (F) ##STR1## wherein R represents CH.sub.3 or H, said structural units forming linear, branched and cyclic structures, and said main-chain skeleton further having a polysilane skeleton ##STR2## (2.ltoreq.n.ltoreq.10). The said organosilicon polymer can be produced by adding at least one anhydrous metal halide to a polysilane having the structure ##STR3## the amount of the metal halide being 0.5 to 10% by weight based on the weight of the polysilane; and heating the mixture in an atmosphere inert to the reaction.

Abstract: A process for producing a thermal-resistant ceramic fired body is disclos As an additive for ceramic powder is used at least one specified organosilicon polymer selected from the group consisting of [I] organopolysiloxanes, [II] organosiloxane copolymers, [III] polycarbosiloxanes and [IV] nitrogen-containing organosilicon polymers.

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: A method for producing a corrosion-, heat- and oxidation-resistant material hich comprises coating a substrate composed of at least one material selected from metals, carbonaceous substances and ceramics with a semi-inorganic compound, and heat-treating the coated substrate; said semi-inorganic compound being either(1) a modified organoborosiloxane compound obtained by reacting an organoborosiloxane compound with at least one organic compound selected from the group consisting of polyhydric aliphatic alcohols, aromatic alcohols, phenols and aromatic carboxylic acid at a temperature of from 250.degree. to 450.degree.

Abstract: A process for producing a corrosion-, heat- and oxidation-resistant shaped rticle which comprises coating a shaped article composed of at least one material selected from metals, carbonaceous substances and ceramics with a coating composition comprising a semi-inorganic compound, and heat-treating the coated article, said semi-inorganic compound being at least one polymer selected from the group consisting of polycarbosilanes and polycarbosiloxanes.

Abstract: This invention relates to a heat-resistant composite magnet comprising 2 to 30% by weight of an organic-inorganic compound binder containing boron and silicon and 70 to 98% by weight of the powder of one or more permanent magnets.This invention further relates to a method for producing a heat-resistant composite magnet, which comprises the steps of (a) adding the powder of one or more permanent magnets to a solution of an organic-inorganic compound binder containing boron and silicon dissolved in an organic solvent; (b) evaporating said solvent; (c) molding the resultant permanent magnet powder covered with said binder under a pressure of 0.1 to 5 tons/cm.sup.2 in the presence or in the absence of a magnetic field of 12,000-5,000 oersted, the molded product being heated at 200.degree.-450.degree. C. during the molding or after the molding; and (d) cooling the molded product.

Abstract: A process for producing a heat-resistant ceramic sintered body, which comses preparing polycarbosilane partly containing siloxane bonds by adding 0.01 to 15% by weight of polyborosiloxane containing phenyl groups in at least a part of the side chains of Si and having a skeletal structure composed of B, Si and O to a polysilane having the structure ##STR1## wherein n is at least 3, and R.sub.1 and R.sub.2, independently from each other, represent methyl, ethyl, phenyl or hydrogen, and heating the polymer mixture in an atmosphere inert to the reaction thereby polymerizing it; mixing said polycarbosilane with a ceramic powder composed of at least one member selected from the group consisting of oxides, carbides, nitrides, borides and silicides; shaping the resulting mixture; and simultaneously with, or after, the shaping of the mixture, sintering the mixture at a temperature of from 800.degree. C. to 2,000.degree. C.

Abstract: A heat-resistant semi-inorganic compound useful as a material for various at-resistant materials is produced by reacting an organoborosiloxane compound with at least one of aliphatic polyhydric alcohols, aromatic alcohols, phenols and aromatic carboxylic acids at 250.degree. to 450.degree. C. in an inert atmosphere.

Abstract: A process for producing polycarbosilane partly containing siloxane bonds, ich comprises adding 0.01 to 15% by weight of polyborosiloxane having phenyl groups in at least a part of the side chains of Si with its skeletal structure being composed of B, Si and O to a polysilane having the structure ##STR1## wherein n is at least 3, and R.sub.1 and R.sub.2, independently from each other, represent methyl, ethyl, phenyl or hydrogen; and heating the polymer mixture in an atmosphere inert to the reaction thereby to polymerize it. The polycarbosilane has excellent properties, and is especially suitable as a raw material for the production of silicon carbide fibers.

Abstract: Molybdenum base composite materials having high tensile strength and oxidon resistance at high temperatures are produced by piling in parallel and embedding silicon carbide fibers containing 0.01-20% by weight of free carbon, which have been produced by the specific method already disclosed in U.S. patent application Ser. No. 677,960, in molybdenum base metallic powders and by compressing and sintering the assembly.

Abstract: Novel borosiloxane polymers are produced by heating at least one of a boric cid compound with phenylsilane to effect polycondensation reaction.

Abstract: Heat resistant and super hard composite materials are produced by mixing more than 60% by weight of an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon or an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon and which contains foreign elements other than silicon, carbon, hydrogen and oxygen with not less than 40% by weight of metal material powders consisting mainly of at least one metal element, molding the mixture into a shaped article and baking the shaped article under a non-oxidizing atmosphere at a temperature of lower than the semi-melting point of the above described metal powders.

Abstract: Chromium base alloy composite materials having high corrosion resistance, idation resistance and tensile strength at high temperatures are produced by laminating and arranging silicon carbide fibers containing 0.01-20% by weight of free carbon, which have been produced by the specific method already disclosed in U.S. patent application Ser. No. 677,960, in volume fraction of 2-50% in chromium base alloy and by compressing and sintering the assembly.