Synergistic strengthening and toughening of oscillatory pressure sintered WC-ZrO2-Al2O3 ceramics

被引：30

作者：

Cheng, Yong ^{[1
,2
]}

Zhu, Tianbin ^{[1
,2
]}

Sun, Nanjie ^{[1
,2
]}

Li, Yawei ^{[1
,2
]}

Xie, Zhipeng ^{[3
]}

Liao, Ning ^{[1
,2
]}

Sang, Shaobai ^{[1
,2
]}

Liang, Xiong ^{[1
,2
]}

Dai, Jinning ^{[4
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China

[2] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Linin, Wuhan 430081, Peoples R China

[3] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[4] Zhuzhou Wanrong New Mat Technol Co Ltd, Zhuzhou 412000, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 922卷

基金：

中国国家自然科学基金;

关键词：

WC-ZrO2-Al2O3; ceramics; Oscillatory pressure sintering; Microstructure; Mechanical properties; MECHANICAL-PROPERTIES; TUNGSTEN CARBIDE; TRIBOLOGICAL PROPERTIES; PHASE-TRANSFORMATION; BINDERLESS WC; MICROSTRUCTURE; TEMPERATURE; COMPOSITES; WEAR; DENSIFICATION;

D O I：

10.1016/j.jallcom.2022.166133

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

WC-ZrO2-Al2O3 ceramics with high performance were prepared by oscillatory pressure sintering, and their densification behavior, microstructure and mechanical properties were investigated. The results showed that addition of ZrO2-Al2O3 composite powder can reduce the sintering temperature (from 1900 ? to 1760 ?) and promote densification of the ceramics. When the ZrO2-Al2O3 composite powder content was 8 wt%, it exhibited the best mechanical properties including Vickers hardness of 24.95 GPa, fracture toughness of 7.74 MPamiddotm(1/2) and flexural strength of 1329 MPa. The main strengthening and toughening mechanisms included the phase transformation of zirconia, crack deflection, crack bridging and the presence of many dislocation defects. Also, the formation of well-matched coherent interfaces of WC/ZrO2 and WC/Al2O3 contributed to a synergistic improvement in strength and toughness of WC-ZrO2-Al2O3 ceramics. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：11

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