先驱体转化法制备连续SiC(OAl)纤维  

Continuous SiC(OAl) Fiber from Polymer Precursor

作　　者：余煜玺[1] 李效东[1] 曹峰[1] 郑春满[1] 王应德[1] 王军[1] 

机构地区：[1]国防科技大学陶瓷纤维及其复合材料重点实验室,湖南长沙410073

出　　处：《稀有金属材料与工程》2006年第4期665-668,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(59972042)

摘　　要：先驱体聚铝碳硅烷经熔融纺丝、空气预氧化处理、1300℃烧成制得连续的含有少量铝和较多氧的SiC(OAl)纤维,即KD-A纤维。通过元素分析、拉伸强度测试及SEM,AFM,HRTEM,XRD等分析对纤维进行了表征。结果表明:连续KD-A纤维是非晶型的含铝SiC纤维,直径为12μm^14μm,具有较高的抗拉伸强度(2.6GPa)和弹性模量(210GPa),其耐高温和抗氧化性能明显优于Nicalon纤维,达到了Hi-Nicalon纤维的水平。Continuous SiC(OAl) fibers, named KD-A fibers, were prepared by the melt-spinning of ceramic precursor polyalumino-carbosilane, air-curing, and pyrolizing at 1300 degrees C. These fibers contain small amount of aluminum and 7wt% oxygen. The fibers are characterized by chemical analysis, tensile strength test, scanning electron microscope, atomic force microscope, high resolution transmission electron microscope, X-ray diffraction. The tensile strength, Young's modulus and diameter of the KD-A fiber are 2.6 GPa, 210 GPa, 12 mu m similar to 14 mu m, respectively. The KD-A fibers have higher thermal stability, more excellent oxidation resistance than the Nicalon fibers. The properties of the KD-A fibers have reached the level of Hi-Nicalon fibers.

关 键 词：连续碳化硅纤维 聚铝碳硅烷 先驱体转化法 耐高温 

分 类 号：TQ343.6[化学工程—化纤工业]