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首页> 外文会议>International Symposium on Sialons and Non-oxides >Controlled crystallisation of a Y-Si-AI-O-N glass typical of grain boundary glasses formed in silicon nitride - based ceramics
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Controlled crystallisation of a Y-Si-AI-O-N glass typical of grain boundary glasses formed in silicon nitride - based ceramics

机译：在氮化硅陶瓷中形成的晶界玻璃典型的Y-Si-Ai-N-N玻璃的晶体化结晶

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This paper provides an overview of the crystallisation of an oxynitride glass likely to remain in a silicon nitride ceramic following firing. The crystallisation process was studied using both differential thermal analysis (DTA) and separate isothermal heat treatments in a tube furnace under nitrogen. The activation energy for the crystallisation process was determined by DTA. The nucleation temperature, Tg + 40°C, which corresponded to the maximum volume fraction of crystalline phases, agreed closely with the optimum nucleation temperature of Tg + 35°C, found from DTA. The optimum crystal growth temperature was observed to be 1210°C and yielded the α-and β-polymorphs of yttrium disilicate. Heat treatments at other temperatures indicated the development of phase assemblages which contained different polymorphs of yttrium disilicate as well as silicon oxynitride. Not all of the polymorphic transformations of yttrium disilicate were observed by DTA unless some crystallisation exotherms were deconvolved, indicating that DTA analysis of the crystallisation of complex systems requires careful interpretation. It is, however, possible to simplify the system by substituting some yttrium by lanthanum. This stabilises the α-polymorph of yttrium disilicate. The activation energy for crystallisation was observed to be similar to that for viscous flow of Y-Si-Al-O-N glasses.
机译：本文提供的氧氮化物玻璃的结晶的概述可能留在一个氮化硅陶瓷烧成以下。使用氮气下的管式炉都差热分析（​​DTA）和单独的等温热处理结晶过程进行了研究。用于结晶过程的活化能是通过DTA测定。成核温度Tg + 40℃，其对应于结晶相的最大体积分数，与最佳成核温度Tg + 35℃的，从DTA发现密切一致。最佳晶体生长温度被观察到1210℃，并产生二硅酸钇的α和β多晶型物。在其他温度下的热处理所指示其含有二硅酸钇的不同晶型以及氮氧化硅相组合的发展。不是所有的二硅酸钇的多晶型转变都是由DTA观察，除非一些结晶放热进行反褶积，表明复杂系统的结晶DTA分析需要谨慎解读。然而，有可能通过用镧代替一些钇以简化系统。这稳定二硅酸钇的α多晶型物。观察到结晶的活化能是类似于对的Y型的Si的Al-O-N眼镜粘性流动。

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