Densification and characterization of hot-pressed ZrC-based composite doped with Nb and CNT

被引：12
|
作者：
Li, Jian [1 ]
Zhang, Zhaofu [1 ]
Wang, Shouhao [1 ]
Wang, Yongchang [1 ]
Dai, Jixiang [1 ]
Zu, Yufei [1 ]
Sha, Jianjun [1 ]
机构：
[1] Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 104卷
基金：
高等学校博士学科点专项科研基金;
关键词：
ZrC; Nb; CNT; Microstructure; Mechanical properties; MECHANICAL-PROPERTIES; ENVIRONMENT; STRENGTH; BEHAVIOR; KINETICS; POWDERS;
D O I：
10.1016/j.matdes.2016.05.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
ZrC-based composite doped with 20 vol.% niobium (Nb) and 3 vol.% carbon nanotubes (CNT) was prepared by hot pressing. Due to the addition of Nb and CNT, the sinterability of ZrC was significantly improved, resulting in highly dense matrix (99.28%) at reduced sintering temperature (1600 degrees C). The flexural strength was 590 MPa at room temperature and 563 MPa at 800 degrees C, respectively. The fracture toughness was 7.23 MPa.m(1/2), which increased by 80% compared with the monolithic ZrC (4 MPa.m(1/2)). In addition, the work of fracture was calculated to be 267 J/m(2). Based on the microstructure characterizations, the improved fracture properties could be attributed to crack deflection, crack bridging and crack branching, which consumed more fracture energy during the fracture process. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：43 / 50
页数：8
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