【摘要】 研究了由聚硅氮烷（PSZ）和聚碳硅烷（PC）热解制得的三种陶瓷的组成、结构与特性。PC热解到1250℃产生Si-C陶瓷,其结晶相是β-SiC微晶,PSZ在N₂或N₂+NH₃中热解分别产生Si-N-C与Si-N无定形陶瓷。这三种陶瓷在Ar气中处理到1500℃以研究其热稳定性。结果表明,Si-C陶瓷从微晶变为β-SiC结晶态,Si-N陶瓷从无定形变为α-Si₃N₄并伴随着可观测到的重量损失,而Si-N-C陶瓷维持其元素组成及β-SiC微晶态直到1500℃。更多还原

【Abstract】 The composition, structure and properties of three kinds of ceramics obtained by pyrolysis ofpolysilazane （PSZ） and polyearbosilane （PC） are studied. The pyrolysis of PC to 1250℃ yields Si-Cceramic which is β-SiC microcrystal, while the pyrolysis of PSZ in N₂ or N₂+NH₃ atmosphere yields Si-N-C and Si-N amorphous ceramics. The three kinds of ceramics are heat-treated between 1300℃ and 1500℃in Ar gas to have their thermal stability examined. The result shows that Si-C ceramic changes frommicrocrystal to β-SIC crystalline, Si-N ceramic from amorphous to α-Si₃N₄, accompained by the observableweight loss, while Si-N-C ceramic retaines its elemental composition and β-SiC microcrystalline state up to1500℃更多还原