|
个人信息Personal Information
副教授
博士生导师
硕士生导师
性别：女
毕业院校：哈尔滨工业大学
学位：博士
所在单位：材料科学与工程学院
学科：航空宇航制造工程. 航空航天力学与工程. 应用与实验力学. 材料学
办公地点：大连理工大学三束实验室4号楼308
联系方式：0411-84706791
电子邮箱：liuxindlut@dlut.edu.cn
Fabrication and properties of HfB2 ceramics based on micron and submicron HfB2 powders synthesized via carbo/borothermal reduction of HfO2 with B4C and carbon
点击次数：
论文类型：期刊论文
发表时间：2015-07-01
发表刊物：INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
收录刊物：SCIE、EI
卷号：51
页面范围：130-136
ISSN号：0263-4368
关键字：Ceramic; Microstructure; Properties
摘要：The two batches of commercially available powders were used as raw materials to synthesize HfB2 powders. The synthesized HfB2 powders were heated at 450 degrees C for 10 mm in the flow of nitrogen and then quenched into liquid nitrogen. The results indicated the refinement effect of liquid nitrogen quenching on synthesized HfB2 powders was very obvious. The relative density values of HfB2 ceramics fabricated using micron and submicron HfB2 powders were less than 89.5% due to the presence of trace carbonaceous compound and more than 98.1% due to higher driving force for densification, respectively. The microstructure, mechanical properties and thermal shock resistance of HfB2 ceramics fabricated using micron and submicron HfB2 powders were investigated in detail. In particular, finite element analysis was used to explore the temperature and thermal stress distribution in the specimen in the course of thermal shock. (C) 2015 Elsevier Ltd. All rights reserved.