Two-step hot pressing of bimodal micron/nano-ZrB2 ceramic with improved mechanical properties and thermal shock resistance

被引：25
作者：
He, Rujie [1 ]
Zhang, Rubing [2 ]
Pei, Yongmao [1 ]
Fang, Daining [2 ]
机构：
[1] Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
[2] Beijing Jiaotong Univ, Sch Civil Engn, Dept Mech, Beijing 100044, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2014年 / 46卷
基金：
中国博士后科学基金; 美国国家科学基金会;
关键词：
ZrB2; Hot pressing; Mechanical properties; Microstructure; Thermal shock resistance; GRAIN-GROWTH; TEMPERATURE; COMPOSITES; ZRB2; DENSIFICATION; BEHAVIOR;
D O I：
10.1016/j.ijrmhm.2014.05.016
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The densification and grain growth behaviors for micron- and nano-sized ZrB2 particles were investigated. The densification on-set temperature (Td-micron) and grain growth on-set temperature (Tg-micron) for micron-sized ZrB2 particles were about 1500 degrees C and 1800 degrees C, respectively. And the densification on-set temperature (Td-nano) and grain growth on-set temperature (Tg-nano) for nano-sized ZrB2 particles were about 1300 degrees C and 1500 degrees C, respectively. A bimodal micron/nano-ZrB2 ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 +/- 35.8 MPa and an improved fracture toughness of 7.2 +/- 0.4 MPa.m(1/2) were obtained. The measured critical thermal shock temperature difference (Delta T-c) for this bimodal micron/nano-ZrB2 ceramic was as high as 433 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：65 / 70
页数：6
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