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

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• 作者：Shouming Zhang ; ^{shoumzh@163.com} ; Song Wang ; Wei Li ; Yulin Zhu ; Zhaohui Chen
• 关键词：Zirconium diboride ; Zirconium carbide ; Reactive melt infiltration ; High temperature treatment ; Mechanical property
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 July, 2012
• 卷：78
• 期：Complete
• 页码：81-84
• 文件大小：615 K

摘要

Zirconium diboride-zirconium carbide based composites were fabricated by reactive melt infiltration with boron carbide and Zr₂Cu at 1200 掳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 掳C in argon. The evaporation of copper at 1600 掳C in vacuum during heat treatment caused degradation in the mechanical properties. However, at a higher temperature of 1800 掳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.