Mechanical properties of the low-temperature reactive melt infiltrated ZrB2-ZrC based composites

被引：17

作者：

Zhang, Shouming ^{[1
]}

Wang, Song ^{[1
]}

Li, Wei ^{[1
]}

Zhu, Yulin ^{[1
]}

Chen, Zhaohui ^{[1
]}

机构：

[1] Natl Univ Def Technol, Natl Key Lab Sci & Technol Adv Ceram Fibers & Com, Changsha 410073, Hunan, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 78卷

基金：

中国国家自然科学基金;

关键词：

Zirconium diboride; Zirconium carbide; Reactive melt infiltration; High temperature treatment; Mechanical property; DIRECTED REACTION; MICROSTRUCTURE; ZIRCONIUM; DENSIFICATION; CERAMICS; KINETICS; ZRC;

D O I：

10.1016/j.matlet.2012.03.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Zirconium diboride-zirconium carbide based composites were fabricated by reactive melt infiltration with boron carbide and Zr2Cu at 1200 degrees C. Mechanical properties of the composites before and after high temperature treatments were investigated. The presence of elongated ZrB2 grains and amorphous residual alloy provided the composites with an excellent fracture toughness of 12.1 MPa m(1/2). High temperature treatments could improve the density of sintered composite and increase the bonding strength between ZrB2 and ZrC grains. This resulted in a flexural strength of 469.7 MPa and an excellent fracture toughness of 13.6 MPa m(1/2) was obtained after a treatment at 1600 degrees C in argon. The evaporation of copper at 1600 degrees C in vacuum during heat treatment caused degradation in the mechanical properties. However, at a higher temperature of 1800 degrees C, the composite showed the highest flexural strength of 484.1 MPa and the highest flexural modulus of 282.2 GPa, apparently counterbalanced the Cu-loss effect. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：81 / 84

页数：4

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