Preparation and characterization of continuous high-temperature resistant Si-Al-C fibers by one-step method  

作　　者：ZHENG ChunMan LI XiaoDong WANG Hao ZHAO DaFang HU TianJiao 

机构地区：[1]School of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073,China

出　　处：《Science China(Technological Sciences)》2008年第9期1425-1432,共8页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 59972042)

摘　　要：Using polymer-derived technology, continuous high-temperature resistant Si-Al-C fibers were prepared by one step method, which included melt-spinning of polyaluminocarbosilane (PACS), curing of continuous PACS fibers, and sintering of the cured products. The results show that the average diameter and tensile strength of continuous Si-Al-C fibers are 11 to 12 μm and 1.8 to 2.0 GPa, respectively. The chemical formula of Si-Al-C fibers is SiC1.01O0.0400Al0.024, which is nearly stoichometric. The fibers are mainly composed of β-SiC crystalline, small amount of α-SiC, and amorphous SiC. Continuous Si-Al-C fibers exhibit excellent thermal stability. When the fibers were exposed in argon for 1 h, the tensile strength did not decrease until 1500°C. After heat treatment at 1800°C in argon for 1 h, the fibers maintained about 80% of the initial strength. It was higher than that of Nicalon and Hi-Nicalon fibers.

关 键 词：high-temperature RESISTANT CONTINUOUS Si-Al-C fibers one STEP method polymer-derived technology 

分 类 号：TQ343[化学工程—化纤工业]