Microstructure and mechanical properties of dense Al2O3-ZrO2 composite ceramic via flash sintering treatment
YAO Shu1, LIU Dianguang1, ZHAO Ke2, LIU Jinling2
1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031, China
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·m1/2, respectively, which are comparable to those of Al2O3-ZrO2 eutectic ceramic fabricated by directional solidification technique.
姚曙, 刘佃光, 赵科, 刘金铃. 闪烧致密Al2O3-ZrO2复相陶瓷的微观结构及力学性能[J]. 粉末冶金材料科学与工程, 2023, 28(5): 500-508.
YAO Shu, LIU Dianguang, ZHAO Ke, LIU Jinling. Microstructure and mechanical properties of dense Al2O3-ZrO2 composite ceramic via flash sintering treatment. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 500-508.
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