Microstructure and mechanical properties of al2o3/y3al5o12/zro2 hypereutectic directionally solidified ceramic prepared by laser floating zone

Kan Song, Jun Zhang, Xin Lin, Lin Liu, Weidong Huang

科研成果: 期刊稿件文章同行评审

44 引用 (Scopus)

摘要

Al2O3/Y3Al5O12/ZrO2 directionally solidified ceramic has been considered as a promising candidate for ultrahigh temperature structural materials due to its excellent performance even close to its melting point. In this work, laser floating zone (LFZ) solidification experiments were performed on Al2O3/Y3Al5O12/ZrO2 hypereutectic with the solidification rates between 2μm/s and 30μm/s. The full eutectic lamellar microstructure is obtained with hypereutectic composition. The solid/liquid interface morphology is investigated. The microstructure characteristic is discussed based on the solid/liquid interface. The variation of lamellar spacing with different compositions and solidification rates was reported and discussed by considering an irregular eutectic growth model. The maximum hardness and fracture toughness are 19.06GPa and 3.8MPam1/2, respectively. The toughening mechanism of ZrO2 is discussed based on the scenario of the crack propagation pattern.

源语言英语
页(从-至)3051-3059
页数9
期刊Journal of the European Ceramic Society
34
12
DOI
出版状态已出版 - 10月 2014

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