Microstructure and Mechanical Properties of In-situ Al<sub>2</sub>O<sub>3</sub>/YSZ Composites Ceramics Prepared by Combustion Synthesis under High Gravity

Pan Chuanzeng; Zhao Zhongmin; Zhang Long; Zhang Jing; Song Yalin

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Microstructure and Mechanical Properties of In-situ Al₂O₃/YSZ Composites Ceramics Prepared by Combustion Synthesis under High Gravity
Issue 1, Pages: 47-50(2008)
Published： 2008 ，
DOI：

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[1]潘传增,赵忠民,张龙,张靖,宋亚林.超重力下合成Al_2O_3/YSZ复合陶瓷的组织与性能[J].特种铸造及有色合金,2008(01):47-50+2.

Pan Chuanzeng, Zhao Zhongmin, Zhang Long, et al. Microstructure and Mechanical Properties of In-situ Al₂O₃/YSZ Composites Ceramics Prepared by Combustion Synthesis under High Gravity. [J]. Special Casting & Nonferrous Alloys (1):47-50(2008)
[1]潘传增,赵忠民,张龙,张靖,宋亚林.超重力下合成Al_2O_3/YSZ复合陶瓷的组织与性能[J].特种铸造及有色合金,2008(01):47-50+2. DOI：

Pan Chuanzeng, Zhao Zhongmin, Zhang Long, et al. Microstructure and Mechanical Properties of In-situ Al₂O₃/YSZ Composites Ceramics Prepared by Combustion Synthesis under High Gravity. [J]. Special Casting & Nonferrous Alloys (1):47-50(2008) DOI：

摘要

通过在铝热剂中引入ZrO2（4Y）粉末

进行超重力下燃烧合成

制备出Al2O3/YSZ系列成分自生复合陶瓷板材

并对陶瓷结构转变与力学性能进行了研究。共晶成分自生复合陶瓷基体主要是以亚微米ZrO2纤维镶嵌于Al2O3上的共晶团构成

亚共晶成分自生复合陶瓷因发生离异共晶生长

其基体为ZrO2相分布于其边界上的Al2O3晶构成

过共晶成分自生复合陶瓷基体则为ZrO2正方相细小球晶构成。共晶成分的自生复合陶瓷因共晶团基体上高残余压应力与小尺寸共晶团边界

其硬度达至最高值16.7GPa;而过共晶成分的自生复合陶瓷因ZrO2正方相球晶相变增韧及相变诱发微裂纹增韧

其断裂韧度达至最大值14.6MPa.m21。

Abstract

By introducing ZrO2（4Y）powder into the thermit

/YSZ composite ceramic plates were prepared through combustion synthesis under high gravity

and microstructure and mechanical properties of the composite ceramics were investigated.The eutectic in-situ composite ceramics consist of the Al

matrix colonies in which t-ZrO2 submicron fibers are embedded

surrounded by the boundary region with t-ZrO2 and Al

irregular particles

and the hypoeutectic ceramics are composed of Al

grain surrounded by ZrO2 bands due to the divorced eutectic growth while the hypereutectic ceramics are mainly made up of fine isolated t-ZrO2 spherical grains.Vickers hardness of the eutectic composite ceramics were reached up to the maximum value of 16.7GPa due to high residual stress in the colony matrix and fine boundary regions of eutectic colony

while fracture toughness can reach up to 14.6 MPa·m1/2 in the hypereutectic composite ceramics due to toughening mechanism involving stress induced t-ZrO2 transformation toughening and transformation induced by micro-crack toughening.