In situ fabrication of highly-dense Al₂O₃/YAG nanoeutectic composite ceramics by a modified laser surface processing

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• 作者：Haijun Su ; Jun Zhang ; Weidan Ma ; Kaichen Wei ; Lin Liu ; Hengzhi Fu ; Shien-Ping Feng ; A.K. Soh
• 关键词：Rapid solidification ; Composites ; Laser surface processing ; Ceramics ; Fracture toughness
• 刊名：Journal of the European Ceramic Society
• 出版年：March, 2014
• 年：2014
• 卷：34
• 期：3
• 页码：739-744
• 全文大小：2588 K

文摘

Alumina-matrix eutectic in situ composite ceramics present excellent high-temperature mechanical properties, which have been considered as promising next-generation ultra-high temperature structural materials. A modified laser surface processing is developed to in situ fabricate highly-dense Al₂O₃/YAG bulk nanoeutectic ceramics with large size and homogeneous three-dimensional network of nanoeutectic microstructure by introducing two-side remelting and high-temperature preheating. The crack and porosity are avoided, and the eutectic structure achieves a good continuous growth between two solidified layers. The eutectic phases show sharp interface bonding with a defined orientation relationship. The dislocations and crack deflection at high-density phase interfaces importantly contribute to the enhanced fracture toughness.