闪烧致密Al2O3-ZrO2复相陶瓷的微观结构及力学性能

姚曙; 刘佃光; 赵科; 刘金铃

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

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 5: 500 - 508

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

工艺技术

闪烧致密Al₂O₃-ZrO₂复相陶瓷的微观结构及力学性能

姚曙 ,
刘佃光 ,
赵科 ,
刘金铃

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1.西南交通大学材料科学与工程学院,成都 610031;
2.西南交通大学力学与航空航天学院,成都 610031

收稿日期: 2023-07-25

修回日期: 2023-09-07

网络出版日期: 2023-11-22

基金资助

国家自然科学基金面上项目(52272074); 四川省科技计划杰青培育项目(2021JDJQ0019); 凝固技术国家重点实验室开放课题(SKLSP202104); 中央高校基本科研业务费专项资金(2682022ZTPY076); 河南省航空材料与应用技术重点实验室开放基金(ZHKF-230102,ZHKF-230114); 广东省基础与应用基础研究基金(2019A1515110967)

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Microstructure and mechanical properties of dense Al₂O₃-ZrO₂ composite ceramic via flash sintering treatment

YAO Shu ,
LIU Dianguang ,
ZHAO Ke ,
LIU Jinling

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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

Received date: 2023-07-25

Revised date: 2023-09-07

Online published: 2023-11-22

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摘要

以α-Al₂O₃和氧化钇稳定氧化锆粉体为原料,无压烧结制备致密Al₂O₃-ZrO₂复相陶瓷,在临界电场下进行热处理后,对Al₂O₃-ZrO₂复相陶瓷的微观结构和力学性能进行研究。结果表明：在900 V/cm的电场下,烧结致密Al₂O₃-ZrO₂复相陶瓷的闪烧起始炉温为308 ℃。在炉温为1 200 ℃、电场为700 V/cm的条件下,闪烧致密Al₂O₃-ZrO₂复相陶瓷原位合成Al₂O₃-ZrO₂共晶结构。闪烧陶瓷主要分为复相区、过渡区和共晶区3个区域。复相区的微观结构与烧结陶瓷相似,形状不规则的Al₂O₃和ZrO₂相均匀分布;过渡区晶粒异常长大,粗大的Al₂O₃和ZrO₂相均匀分布;共晶区则呈现典型的Al₂O₃-ZrO₂共晶结构。共晶区的维氏硬度和韧性分别为17.94 GPa和3.51 MPa·m^1/2,与采用定向凝固技术制备的Al₂O₃-ZrO₂共晶陶瓷的力学性能相当。

关键词： 闪烧; Al₂O₃-ZrO₂; 复相陶瓷; 共晶; 硬度; 韧性

本文引用格式

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

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

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