【作者】 薛金根； 王应德； 宋永才；

【Author】 XUE Jin-gen,WANG Yin-de,SONG Yong-cai (Key Lab.of New Ceramic Fibers & Composites,National University of Defense Technology, Changsha 410073,China)

【机构】 国防科技大学CFC国防科技重点实验室；

【摘要】 高分子量聚碳硅烷通过溶液纺丝后,可以无需不熔化处理过程而直接进行高温烧成制备得到低氧含量的SiC纤维。通过TG-DTA、IR等手段研究了高分子量聚碳硅烷纤维的热分解特性。结果表明,高分子量聚碳硅烷纤维在750～1250℃完成无机化,陶瓷产率高达87%;在无机化过程中,高分子量聚碳硅烷纤维在250℃开始发生自交联反应形成凝胶,在烧成温度超过550℃后形成完全"不熔不溶"的网状结构。更多还原

【Abstract】 Preparation of SiC fiber by dry spinning could decrease oxygen content of the SiC fiber,because it could be pyrolyzed at high temperature directly without curing process.The thermolysis process of of PCS fiber with high molecule weight was studied by TG—DTA and IR techniques in details.The results showed that the PCS fiber with high molecule weight completed inorganic process at 750～1250℃,its’ceramic yield was 87%. Self crosslinking of the dry spinning derived PCS fibers starts to take place at 250℃during pyrolysis process,and crosslinked completely at 550℃to form a network structure which cannot be melted or dissolved.更多还原