碳氮化硅(SiCN)和含硼的碳氮化硅(SiBCN)在1400℃以上的高温仍保持非晶态结构,具有比SiC、Si3N4更好的高温性能.SiCN的玻璃转变温度Tg大于1400℃,在此温度以上开始有晶体析出,最终为多晶SiC和Si3N4.SiBCN在1700℃仍保持非晶态,于1800℃以上开始析晶.这两种材料在1600℃表现出极好的抗氧化性能.按照高温材料的要求,论述了这两类材料的高温热稳定性、抗氧化性以及抗蠕变性能.展望了该材料作为高温陶瓷材料的发展趋势.
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