聚碳硅烷纤维成形过程的稳定性研究  

Studies on the Spinning Stabilities of Continuous Polycarbosilane Fibers Formation

作　　者：王应德[1] 蓝新艳[1] 王鲁[1] 薛金根[1] 姜勇刚[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2004年第6期21-24,共4页Journal of National University of Defense Technology

基　　金：湖南省自然科学基金资助项目(02JJY2083);国家自然科学基金资助项目(50082007);国家863高技术资助项目(2002AA305101)

摘　　要：通过改变不同的熔融纺丝工艺研究了聚碳硅烷纤维熔融纺丝时纺丝稳定性的影响因素。研究表明:提高介质温度到180～200℃、采用向下的环形吹风、控制成形区气流的大小与流向、纺程控制在90cm左右、加强集束与控制外部条件的稳定性等有利于提高纺丝稳定性。A continuous polycarbosilane(PCS) multifilament was melt spun at≈300℃. Spinning was performed with a laboratory scale extrusion apparatus equipped with a multi-hole spinneret. The filament was drawn down to a diameter of 10～25μm, the mechanical stretching being applied to the filament via the take-up reel. The spinning stability was investigated by introducing the ringy spinning channel and mobile take-up reel and changing the melt spinning processing, in order to obtain continuous PCS-derived silicon carbide fiber with fine diameter,lower diameter's dispersion rate and higher tensile strength. The results show that increasing the cooling temperature within the 180～200℃ range, introducing ringy and downward airflow by a special spinning channel, controlling a proper spinning line of about 90cm in length, enhancing fibers' gathering and controlling the stabilities of spinning conditions can improve the spinning stability availably.

关 键 词：聚碳硅烷 碳化硅 纤维 成形 纺丝稳定性 

分 类 号：V221[航空宇航科学与技术—飞行器设计]