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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%。
The precursor polycarbosilane (PCS) was melt-infiltrated by the negative pressure thermal oxidation method. The effects of the atmosphere pressure and the treatment temperature on the weight gain rate, the degree of hydrosilation reaction, the gel content, the chemical structure, Effect of pyrolysis characteristics. The results showed that under negative pressure thermal oxidation, the weight gain rate, hydrosilylation degree, gel content and ceramic yield of precursor silk decreased with the decrease of atmosphere pressure and treatment temperature. When the atmosphere pressure is -0.02 MPa, the weight gain rate of the precursor silk decreases from 9.98% to 2.80% and the hydrosilylation degree decreases from 63.62% to 21.85% as the treatment temperature decreases from 195 ℃ to 175 ℃. The gel content From 73.53% to 1.98%, the ceramic yield decreased from 87.81% to 81.29%.