초록 ▼

The invention provides a novel inorganic fiber composed of the elements of silicon, carbon, boron and nitrogen of which the Si/B molar ratio is 2:1 to 200:1. The inorganic fiber is obtained by a method comprising the steps of: (a) preparing an organoborosilicon polymer by heating a mixture of an org

The invention provides a novel inorganic fiber composed of the elements of silicon, carbon, boron and nitrogen of which the Si/B molar ratio is 2:1 to 200:1. The inorganic fiber is obtained by a method comprising the steps of: (a) preparing an organoborosilicon polymer by heating a mixture of an organopolysilane and an organoborazine compound, e.g. B-trimethyl-N-triphenyl borazine, to effect thermal decomposition and polycondensation reaction; (b) spinning the polymer into a fibrous form; (c) infusibilizing the fiber of the polymer by thermally oxidizing in an oxidizing atmosphere or by irradiating with ionizing radiations; and (d) calcining the infusibilized fiber at 900°to 1800°C. The inventive inorganic fiber is more stable at high temperatures than conventional silicon carbide fibers.

대표청구항 ▼

A method for the preparation of an inorganic fiber comprising the elements of silicon, carbon, boron and nitrogen which comprises the steps of: (a) heating a reaction mixture composed of an organosilicon compound having, in a molecule, at least one silicon-to-silicon linkage and at least one group d

A method for the preparation of an inorganic fiber comprising the elements of silicon, carbon, boron and nitrogen which comprises the steps of: (a) heating a reaction mixture composed of an organosilicon compound having, in a molecule, at least one silicon-to-silicon linkage and at least one group denoted by R1, R1 being a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, vinyl and phenyl groups, bonded to the silicon atom and an organoboron compound represented by the unit formula －BR2－NR3－, in which R2 is a monovalent group selected from the class consisting of monovalent hydrocarbon groups, trihydrocarbylsilyl-substituted alkyl groups of the formula －CH2)nSiR43, R4 being a monovalent hydrocarbon group and n being a positive integer, and substituted or unsubstituted amino groups of the formula －NR52, R5 being a hydrogen atom or a monovalent hydrocarbon group, and R3 is a monovalent hydrocarbon group, in the molar ratio of silicon to boron in the range from 2:1 to 200:1 at a temperature in the range from 250°to 500°C. in an inert atmosphere to effect the thermal decomposition and polycondensation reaction of the reactants forming an organoborosilicon polymer having a number-average molecular weight in the range from 1,000 to 50,000; (b) spinning the organoborosilicon polymer into a fibrous form; (c) infusibilizing the thus formed fiber of the organoborosilicon polymer; and (d) calcining the infusibilized fiber of the organoborosilicon polymer at a temperature in the range from 900°to 1800°C. in an atmosphere of vacuum or an inert gas.