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利用大气等离子喷涂的方法制备8YSZ热障涂层,将涂层进行高温时效处理。采用X射线衍射技术和Rietveld全谱拟合相结合的方法,研究8YSZ涂层在高温时效条件下的相演化规律。结果表明,8YSZ原始态粉末主要为稳定四方相(t-ysz)结构,而喷涂态涂层则以亚稳态四方相(t'-ysz)为主。高温时效后,随温度的升高和时效时间的延长,t'-ysz逐渐分解形成t-ysz和c-ysz,各相含量在高温时效处理前10 h变化显著,10 h以后趋于平缓。随相变的进行,t'-ysz的微应变也不断变化。当温度高于1200℃时,相变加剧,t'-ysz的微应变也随之急剧上升。高温时效过程中,涂层未发生t-ysz→m-...
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热加工工艺
Year: 2015
Issue: 18
Volume: 44
Page: 156-159,163
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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