聚碳硅烷先驱丝的负压氧化特性研究

硅酸盐通报 ›› 2017, Vol. 36 ›› Issue (3): 878-882.

聚碳硅烷先驱丝的负压氧化特性研究

杨连;黎阳

贵州师范大学材料与建筑工程学院,贵阳,550025

出版日期:2017-03-15 发布日期:2021-01-18
基金资助:
Postgraduate Innovation Foundation of Guizhou Normal University(201524)%National Natural Science Foundation of China(51462004)

Thermal Oxidation Characteristics of PolycarbosilanePrecursor Fibers under Negative Pressure

YANG Lian;LI Yang

Online:2017-03-15 Published:2021-01-18

摘要/Abstract

摘要： 采用负压热氧化法对聚碳硅烷(PCS)先驱丝进行不熔化处理,并研究了气氛压力和处理温度对PCS先驱丝的增重率、硅氢反应程度、凝胶含量、化学结构及其热解特性的影响.结果表明:在负压热氧化作用下,先驱丝的增重率、硅氢反应程度、凝胶含量以及陶瓷产率均随气氛压力和处理温度的降低而降低.当气氛压力为-0.02 MPa时,随着处理温度从195 ℃降低到175 ℃,先驱丝的增重率从9.98%降低到2.80%,硅氢反应程度从63.62% 降低到21.85%,凝胶含量从73.53%降低到1.98%,陶瓷产率从87.81% 降低到81.29%.

关键词: 聚碳硅烷先驱丝;负压;热氧化

Abstract: Polycarbosilane (PCS) precursor fibers were thermal oxidation treated under negative pressure.The effect of atmosphere pressure and heating temperature on weight gain, Si-H bond reaction degree, gel content, chemical structure and pyrolysis characteristics of the PCS precursor fibers were studied.The experimental results show that the weight gain, gel content, Si-H bond reaction degree and ceramic yield of the fibers are all decreased with decreasing atmosphere pressure and heating temperature.Under the atmosphere pressure of-0.02 MPa, with the temperature descended from 195 ℃ to 175 ℃, the weight gain was decreased from 9.98% to 2.80%, the Si-H bond reaction degree was decreased from 63.62% to 21.85%, the gel content was decreased from 73.53% to 1.98% and the ceramic yield was decreased from 87.81% to 81.29%.

Key words: polycarbosilane precursor fiber;negative pressure;thermal oxidation

中图分类号:

TQ343+.6

杨连;黎阳. 聚碳硅烷先驱丝的负压氧化特性研究[J]. 硅酸盐通报, 2017, 36(3): 878-882.

YANG Lian;LI Yang. Thermal Oxidation Characteristics of PolycarbosilanePrecursor Fibers under Negative Pressure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2017, 36(3): 878-882.