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论文类型：期刊论文

发表时间：2013-09-01

发表刊物：CERAMICS INTERNATIONAL

收录刊物：SCIE、EI、Scopus

卷号：39

期号：7

页面范围：7445-7452

ISSN号：0272-8842

关键字：Eutectic ceramic; Melt superheating treatment; Microstructure evolution; Melt undercooling; Microstructure refinement

摘要：Microstructure developments of melt-grown Al2O3/YAG/ZrO2 ceramic bulks were investigated by controlling composition, cooling rate, heterogeneous nucleation sites and melt superheating treatment. The solidification microstructure of sample with hypereutectic composition (ZrO2 20 mol%) is finer than that with hypoeutectdc or eutectic ones. With increasing the cooling rate, microstructure of melt-grown samples develops from colony to dendrite and finally to cell. The microscopy and the components of samples vary with the melt superheating temperature and the type of heterogeneous nucleation sites. The microstructure evolutions of melt-grown Al2O3/YAG/ZrO2 eutectic relate to the melt undercooling level and the solid-liquid interfaces stability. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.