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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%.

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%.

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