Fabrication, mechanical properties and thermal shock resistance of a ZrB2-graphite ceramic

被引：50
|
作者：
Wang Zhi [1 ]
Wu Zhanjun [1 ]
Shi Guodong [1 ]
机构：
[1] Dalian Univ Technol, Fac Vehicle Engn & Mech, Sch Aeronaut & Astronaut, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2011年 / 29卷 / 03期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Ceramics; Microstructure; Mechanical properties; Thermal shock resistance; HIGH TEMPERATURE CERAMICS; MATRIX COMPOSITES; FRACTURE; DIBORIDES; ZIRCONIUM; TOUGHNESS;
D O I：
10.1016/j.ijrmhm.2010.12.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A ZrB2 ceramic containing 25 vol.% graphite flake (ZrB2-graphite) ceramic was fabricated by hot-pressing at 1950 degrees C. It was shown that the fracture toughness was significantly improved due to the addition of graphite flake whereas the flexure strength and hardness were slightly reduced. The increase in fracture toughness was attributed to the presence of soft graphite flake and weaker interface bonding. The decrease in the flexural strength was due to the increase in weakening factors such as the weaker bonding within the ZrB2-graphite ceramic and lower load transfer since the lower mechanical property of the graphite flake as well as graphite flakes acted as flaws in the ZrB2-graphite ceramic. The thermal shock resistance was significantly improved and the improvement mechanism in thermal shock resistance was analyzed by Griffith fracture criterion and finite element analysis. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：351 / 355
页数：5
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