High-temperature flexural creep of ZrB2-SiC ceramics in argon atmosphere

被引：17

作者：

Guo, Wei-Ming ^{[1
]}

Zhang, Guo-Jun ^{[1
]}

Lin, Hua-Tay ^{[2
]}

机构：

[1] Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

来源：

CERAMICS INTERNATIONAL | 2012年 / 38卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Creep; ZrB2-SiC; Four-point flexure; Microstructure; Cavitations; DIBORIDE-SILICON CARBIDE; ZIRCONIUM; DEFORMATION; ALUMINA; OXIDATION; COMPOSITE; BEHAVIOR; NITRIDE; AIR;

D O I：

10.1016/j.ceramint.2011.06.046

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：

Four-point flexure creep deformation of ZrB2-30 vol% SiC ceramics in argon atmosphere under a static load of 19 MPa for 0-100 h at 1500 and 1600 degrees C was investigated. The strain rate at 1600 degrees C was 3.7 times higher than that at 1500 degrees C. Microstructural evolution during creep consisted of nucleation and growth of triple-point cavitations which were always associated with SiC particles. Due to the low stress, only isolated cavitations were nucleated, and no microcracks were formed. For up to 100 h at 1500 and 1600 degrees C, the grains maintained their size and shape. The cavitations in both size and number showed no obvious difference from 26 to 100 h at 1500 degrees C, whereas that showed a significant increase from 26 to 100 h at 1600 degrees C. Present study suggested that ZrB2-30 vol% SiC exhibited relatively good microstructural stability and creep resistance at 1500 degrees C in argon atmosphere. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：831 / 835

页数：5

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