초록 ▼

Continuous inorganic fibers consisting substantially of Si, Zr and C and optionally of O, said fibers being composed of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or (2) an aggregate consisting substantially of ultrafine crystalline particles of bb1-x whe

Continuous inorganic fibers consisting substantially of Si, Zr and C and optionally of O, said fibers being composed of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or (2) an aggregate consisting substantially of ultrafine crystalline particles of bb1-x wherein O2 and ZrO2 sometimes exist in the neighborhood of these ultrafine crystalline particles, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. The aforesaid continuous inorganic fibers can be produced by the following steps: a first step of preparing a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton composed mainly of carbosilane units of the formula －Si－CH2 －, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the class consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula －Sr-O－; a second step of preparing a spinning dope of said semi-inorganic block copolymer and spinning the dope; a third step of subjecting the resulting fibers to a treatment of rendering them infusible under tension or under no tension; and a fourth step of firing the infusible fibers at a temperature of 800°to 1800°C. in a vacuum or in an atmosphere of an inert gas or a reducing gas.

대표청구항 ▼

Novel continuous, fired, infusible inorganic fibers made from a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton consisting essentially of carbosilane units of the formula －Si－CH2－, each silicon atom of said carbosilane units having bonded thereto a side-

Novel continuous, fired, infusible inorganic fibers made from a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton consisting essentially of carbosilane units of the formula －Si－CH2－, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the group consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula －Zr－O－, said fibers being composed of (1) an amorphous material consisting essentially of Si, Zr and C, or (2) an aggregate consisting essentially of ultrafine crystalline particles of bb1-x wherein 0x1 and having a particle diameter of not more than 500 Å, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. Novel continuous, fired, infusible inorganic fibers made from a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton consisting essentially of carbosilane units of the formula －Si－CH2－, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the group consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula －Zr－O－, said fibers being composed of (1) an amorphous material consisting essentially of Si, Zr, and C and O, or (2) an aggregate consisting essentially of ultrafine crystalline particles of bb1-x wherein 0x1 and having a particle diameter of not more than 500 Å, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. Novel continuous, fired, infusible inorganic fibers made from a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton consisting essentially of carbosilane units of the formula －Si－CH2－, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the group consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula －Zr－O－, said fibers being composed of (1) an amorphous material consisting essentially of Si, Zr, and C and O, or (2) an aggregate consisting essentially of amorphous SiO2 and ZrO2, ultrafine crystalline particles of bb1-x wherein 0x1 and having a particle diameter of not more than 500 Å, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles.