Crystallisation of Grain Boundary Phases in Silicon Nitride and SiAlON Ceramics
Crystallisation of Grain Boundary Phases in Silicon Nitride and SiAlON Ceramics
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氮化硅和 SiAlON 陶瓷中晶界相的结晶
DOI：
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发表时间：
1993
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通讯作者：
M. Lewis
中科院分区：
文献类型：
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作者：
M. Lewis
本文综述了在氮化硅和赛隆陶瓷中调整烧结液成分和工艺周期以实现晶间相结晶的原理和实践。Sialon陶瓷的关键特征是残余玻璃中的O/N平衡和烧结后的热处理温度，以使恒定组成的中间相或氧化物相的成核以及β'或α'固溶体中的非化学计量组分的重新分配。非赛隆组合物中二硅酸盐相的结晶化在控制具有不同原子体积的多晶型物方面提出了一个问题。晶间相的结晶主要影响这些陶瓷的高温力学和环境行为。
A survey is presented of the principles and practice of tailoring sintering liquid composition and processing cycle to enable crystallisation of intergranular phases in silicon nitride and sialon ceramics. Critical features in sialon ceramics are the O/N balance in residual glasses and post-sintering heat-treatment temperatures to enable nucleation of either intermediate phases at constant composition or oxide phases with re-partitioning of non stoichiometric components in β’ or α’ solid solutions. Crystallisation of disilicate phases in non-sialon compositions exemplifies a problem in control of polymorphs with differing atomic volumes. Crystallisation of intergranular phases has an influence mainly on high-temperature mechanical and environmental behaviour of these ceramics.