MECHANICAL PROPERTIES OF TiC-Ni PRODUCED BY SHS AT ROOM AND HIGH TEMPERATURES
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摘要: 研究了燃烧合成新工艺制备的TiC-Ni金属陶瓷材料的力学性能。结果表明:TiC-Ni金属陶瓷硬度值和抗弯强度在Ni含量为20 wt%时达到最高值,断裂韧性在Ni含量为30 wt%时达到最大值,TiC-Ni材料在室温下具有无宏观塑性变形的脆性断裂特征。随着温度的升高,TiC-Ni材料弯曲强度下降,温度超过1000℃开始发生塑性变形。其强度与传统方法生产的相近成分材料相比比较接近。Abstract: In this paper, mechanical properties of TiC-Ni cermets were investigated, which were produced by new technique——self-propagating high-temperature combustion synthesis combined with forced compaction. The results showed that HRA hardness and bending strength reached the maximum values when Ni content was 20 wt%, and a fracture toughness maximum was obtained when Ni content was 30 wt%. At room temperature, the fracture of TiC-Ni cermets is characterized as brittle fracture. At high temperature, bending strength of TiC-Ni cermets decreased with temperature increasing and plastic distortion took place beyond 1000℃. The strength of TiC-Ni cermets is close to that of the materials with similar composition prepared by traditional powder metallurgy process.
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Key words:
- hardness value /
- fracture toughness /
- bending strength /
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