polysilan - polycarbosilan copolymer solutions and the resulting anaerobic ceramic formku00f6rper with compositions close to you

摘要

The invention relates to a method for producing a polysilane-polycarbosilane copolymer solution. Said method comprises the preparation of a polysilane, obtained by the disproportionation of a methylchlorodisilane or a mixture of methylchlorodisilanes of formula Si2MenCl6-n with a Lewis base as the catalyst, a subsequent thermal cross-linking of the polysilane to form an infusible polysilane-polycarbosilane copolymer that is soluble in inert solvents, in addition to the production of said solution by the dissolution of the polysilane-polycarbosilane copolymer in an inert solvent. The invention also relates to a method for producing oxygen-depleted ceramic fibres and other moulded bodies with a composition similar to that of SiC. Said method comprises the production of a polysilane-polycarbosilane copolymer solution, the spinning of said solution to obtain green fibres according to the dry spinning method and the pyrolysis of the dried green fibres in an inert gas atmosphere or a reductive atmosphere.