闪烧致密Al2O3-ZrO2复相陶瓷的微观结构及力学性能

doi:10.19976/j.cnki.43-1448/TF.2023065

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Abstract Dense Al₂O₃-ZrO₂ composite ceramics were prepared by pressureless sintering using α-Al₂O₃ and yttria stabilized zirconia powders as raw materials, conducting heat treatment under critical electric field, and the microstructure and mechanical properties of the composite ceramics were investigated. Results indicate that the onset temperature of flash sintering for sintered dense Al₂O₃-ZrO₂ composite ceramic is 308 ℃ under an electric field of 900 V/cm. Al₂O₃-ZrO₂ eutectic zone is in-situ synthesized in the dense Al₂O₃-ZrO₂ composite ceramic using flash sintering at 1 200 ℃ and 700 V/cm. The flash sintered ceramic is divided into three zones: composite zone, transition zone, and eutectic zone. In the composite zone, the Al₂O₃ and ZrO₂ phases are irregular shapes and uniformly distributed, where there is similar microstructure to the sintered ceramic. In the transition zone, the abnormal grain growth is observed, and the coarse Al₂O₃ and ZrO₂ phases are evenly distributed. In the eutectic zone, it possesses the typical microstructure of Al₂O₃-ZrO₂ eutectic ceramic. The Vickers hardness and toughness of eutectic zone are 17.94 GPa and 3.51 MPa·m^1/2, respectively, which are comparable to those of Al₂O₃-ZrO₂ eutectic ceramic fabricated by directional solidification technique.

Key words： flash sintering Al₂O₃-ZrO₂ composite ceramic eutectic hardness toughness

Received: 25 July 2023 Published: 22 November 2023

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	YAO Shu
	LIU Dianguang
	ZHAO Ke
	LIU Jinling

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YAO Shu,LIU Dianguang,ZHAO Ke, et al. Microstructure and mechanical properties of dense Al₂O₃-ZrO₂ composite ceramic via flash sintering treatment[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 500-508.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023065 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I5/500

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