聚碳硅烷先驱体交联后热处理对陶瓷转化的影响

Effects of Heat-treatment Following Crosslinking of Polycarbosilane on Ceramic Conversation

将聚碳硅烷交联产物在裂解前,先在200～400℃进行不同温度下的热处理,研究其对陶瓷转化过程的影响。结果表明,经400℃/2h热处理后,其裂解产物的陶瓷产率达到73 9%;裂解产物结构的主要缺陷为气孔,而未经热处理样品裂解产物结构的主要缺陷为裂纹。如果用该结构的陶瓷为基体,可以减少纤维损伤。

The crosslinked products of polycarbosilane were heated between 200-400℃ before pyrolysis in order to investigate their effects on conversation of ceramic. It was shown that 73.9% ceramic yield was raised when heated two hours at 400℃.The dominating defects in structure of its product pyrolysed were pores,not cracks in structure of that without heattreatment.The damage of fiber could be decreased significantly if such ceramic were used as base.