초록 ▼

Silicon nitride based ceramic fibers containing Si, N, O and at least one metal M in amounts providing the atomic ratios N/Si of 0.3 to 3, O/Si of 0.0001 to 15 and M/Si of 0.001 to 5 and exhibiting an X-ray small angle scattering such that the ratio of the intensity of the small angle scattering of

Silicon nitride based ceramic fibers containing Si, N, O and at least one metal M in amounts providing the atomic ratios N/Si of 0.3 to 3, O/Si of 0.0001 to 15 and M/Si of 0.001 to 5 and exhibiting an X-ray small angle scattering such that the ratio of the intensity of the small angle scattering of the fibers to that of air is 1 to 20. The ceramic fibers are produced by spinning of a polymetallosilazane into fibers and calcining the spun fibers and are useful as reinforcing fibers for composite artices having a metal or resin matrix.

대표청구항 ▼

A ceramic silicon nitride fiber containing Si, N, O and at least one metal M in amounts providing the following atomic ratios: N/Si: 0.3 to 3, O/Si: 0.001 to 15, M/Si: 0.01 to 5, said ceramic exhibiting an X-ray small angle scattering such that the ratio of the intensity of the small angle scatter

A ceramic silicon nitride fiber containing Si, N, O and at least one metal M in amounts providing the following atomic ratios: N/Si: 0.3 to 3, O/Si: 0.001 to 15, M/Si: 0.01 to 5, said ceramic exhibiting an X-ray small angle scattering such that the ratio of the intensity of the small angle scattering of the fibers to that of air is 1 to 20, said fiber being produced by a process comprising: providing a polymetallosilazane having a number molecular weight of 200-500,000 and which is a product obtained by reacting a polysilazane having a number average molecular weight of 100-50,000 and having a main skeletal structure containing the following recurring unit: [Figure] wherein R1, R2 and R3 represent independently from each other hydrogen, hydrocarbyl, a group other than hydrocarbyl having a carbon atom bonded to the silicon atom of the above formula, alkylsilyl, alkylamino or alkoxy, with a metal alkoxide of the formula: M(OR4)n wherein M is a metal, R4 is hydrogen, alkyl having 1-20 carbon atoms or aryl and n is the valence of the metal M with the proviso that at least one of the n number of the R4 is alkyl or aryl; spinning said polymetallosilazane into fibers; and calcining said fibers.