Mechanical Properties and Thermal Shock Resistance Analysis of BNNT/Si3N4 Composites

被引：8
|
作者：
Wang, Shouren [1 ]
Wang, Gaoqi [1 ]
Wen, Daosheng [1 ]
Yang, Xuefeng [1 ]
Yang, Liying [1 ]
Guo, Peiquan [1 ]
机构：
[1] Univ Jinan, Sch Mech Engn, Jinan 250022, Shandong, Peoples R China
来源：
APPLIED COMPOSITE MATERIALS | 2018年 / 25卷 / 02期
关键词：
Microstructure; BNNT; Si3N4; Mechanical property; Thermal shock resistance; CERAMICS;
D O I：
10.1007/s10443-017-9627-3
中图分类号：
TB33 [复合材料];
学科分类号：
摘要：
BNNT/Si3N4 ceramic composites with different weight amount of BNNT fabricated by hot isostatic pressing were introduced. The mechanical properties and thermal shock resistance of the composites were investigated. The results showed that BNNT-added ceramic composites have a finer and more uniform microstructure than that of BNNT-free Si3N4 ceramic because of the retarding effect of BNNT on Si3N4 grain growth. The addition of 1.5 wt.% BNNT results in simultaneous increase in flexural strength, fracture toughness, and thermal shock resistance. The analysis of the results indicates that BNNT brings many thermal transport channels in the microstructure, increasing the efficiency of thermal transport, therefore results in increase of thermal shock resistance. In addition, BNNT improves the residual flexural strength of composites by crack deflection, bridging, branching and pinning, which increase the crack propagation resistance.
引用
收藏
页码：415 / 423
页数：9
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