Effect of boron nitride nanotubes content on mechanical properties and microstructure of Ti(C,N)-based cermets

被引：24
|
作者：
Liu, Hanlian [1 ,2 ]
Chai, Yacong [1 ,2 ]
Huang, Chuanzhen [1 ,2 ]
Liu, Huahe [1 ,2 ]
Wang, Jun [1 ,2 ]
机构：
[1] Shandong Univ, Ctr Adv Jet Engn Technol CaJET, Sch Mech Engn, Jinan 250061, Peoples R China
[2] Shandong Univ, Minist Educ, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2015年 / 41卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Ti(C; N) based cermets; BNNTs; Mechanical properties; Microstructure; WALLED CARBON NANOTUBES; FABRICATION; COMPOSITES; CERAMICS;
D O I：
10.1016/j.ceramint.2014.10.101
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：
Boron nitride nanotubes (BNNTs) reinforced Ti(C,N)-based cermets were fabricated by hot-pressing, and the effect of BNNTs content on their mechanical properties and microstructure was investigated. The composite containing 0.5 wt% BNNTs showed a flexural strength of 1785 MPa. Compared with monolithic Ti(C,N)-based cermets, the Ti(C,N)/BNNTs composite exhibited a significant increase in flexural strength and a slight increase in Vickers hardness and fracture toughness. The added BNNTs could refine matrix grains significantly; however, the excessive content of BNNTs aggregated in the matrix and resulted in a decline in the mechanical properties of the composites. The strengthening and toughening mechanisms of Ti(C,N)/BNNTs composite were discussed, including crack deflection, crack branching, grain bridging and transformation of fracture mode. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：2813 / 2818
页数：6
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