抄録
The crystallization of high purity amorphous polymer-derived Si3N4 fiber, which was heat-treated with and without BN powders, was investigated. In the case without BN powder, the crystallization proceeds by vapor phase growth mechanism through SiO gas. The activation energy of 602kJ/mol was calculated. In the case with BN powder, the crystalline growth and crystallization through vapor phase was fairly suppressed. The crystallization proceeds by solid phase growth mechanism. The activation energy of 1273kJ/mol was calculated.
Durability of Si3N4 fiber in a ceramic matrix composite was estimated. Si3N4 fiber may remain amorphous at 1300°C for 5×104h and at 1400°C for 6×10h, respectively.
