| 摘要 |
A process for producing novel continuous inorganic fibers, which comprises [1] a first step of forming a modified polycarbosilane by mixing a specific polysilane with polyvanadiosiloxane or a vanadium complex having oxygen as a coordinating stem adjacent to the vanadium atom and reacting the mixture at 250 to 500 DEG C in an atmosphere inert to the reaction, [2] a second step of preparing a spinning dope of the modified polycarbosilane and spinning it; [3] a third step of rendering the resulting fibers infusible under tension or in the absence of tension; and [4] a fourth step of firing the infusible fibers at a temperature of 800 to 1800 DEG C in vacuum or in an atmosphere of an inert gas; and continuous inorganic fibers consisting substantially of Si, V and C (which may contain O as an impurity), said fibers being composed substantially of [1] an amorphus ternary carbide of the formula Si@V.C. in which 0.25 >/= x >/= 0.001and 1.50 >/= y >/= 1.00, or [2] a crystal aggregate consisting of beta -SiC substantially as a main component and vanadium carbide and graphite, the proportions of vanadium and graphite not exceeding 0.25 mole and 0.50 mole respectively per mole of beta -SiC, these crystalline compounds being in the form of ultrafine particles having a crystal grain size of not more than 500 ANGSTROM and being entangled to form an intimate composite, or [3] a mixture of the amorphous double carbide [1] and the crystal aggregate [2]. |
