Improving oxidation resistance of ZrB2-based ceramics by LaF3 doping via oxidation-induced self-healing mechanism

被引：8

作者：

Hu, Jing ^{[1
]}

Xie, Jianliang ^{[1
]}

Jiang, Xianyu ^{[1
]}

Li, Qi ^{[1
]}

Wang, Xin ^{[1
]}

Zhang, Li ^{[1
]}

Yin, Liangjun ^{[2
]}

Deng, Longjiang ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Ma, State Key Lab Elect Thin Film & Integrated Device, 2006 Xiyuan Rd, Chengdu 611731, Peoples R China

[2] Univ Elect Sci & Technol China, Sch Mat & Energy, 2006 Xiyuan Rd, Chengdu 611731, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2021年 / 47卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Pore filling; Dense layer; Oxidation resistance; Self-healing mechanism;

D O I：

10.1016/j.ceramint.2020.12.084

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZrB2-based ceramics are important materials for a variety of applications. However, their low oxidation resistance above 1000 degrees C limits their high-temperature applications. Herein, we report the utilization of LaF3 as a unique oxidation retardant to significantly improve the oxidation resistance of ZrB2-10 vol%LaF3 ceramics in the temperature range of 1000-1400 degrees C. Moreover, we present the densification of the oxide layer via oxidation-induced self-healing mechanism of ZrB2-LaF3 ceramics for the first time. The incorporation of LaF3 into ZrB2 matrix was achieved by using spark plasma sintering at 1800 degrees C. Furthermore, the oxidation behavior of pure ZrB2 and ZrB2-10 vol%LaF3 ceramics was systematically investigated by analyzing the thicknesses of oxide layers and the weight gains. Both the thicknesses and weight gain were significantly reduced after adding 10 vol. % LaF3, which can be mainly attributed to the synergistic influence of pore filling and healing by LaB3O6/LaBO3 phases and corresponding volumetric expansions.

引用

页码：9504 / 9512

页数：9

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