Effects of ZrC on microstructure, mechanical properties and thermal shock resistance of TiC–ZrC–Co–Ni cermets
Effects of ZrC on microstructure, mechanical properties and thermal shock resistance of TiC–ZrC–Co–Ni cermets
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DOI：
10.1016/j.msea.2012.11.003
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发表时间：
2013-01
期刊：
影响因子：
6.4
通讯作者：
Xiaobo Zhang;N. Liu
中科院分区：
文献类型：
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作者：
Xiaobo Zhang;N. Liu
采用真空烧结法制备了不同ZrC含量的TiC-ZrC-Co-Ni金属陶瓷。研究了显微组织、力学性能和耐热震性。结果表明，显微组织中观察到明亮的球形晶粒，并且其相对数量随着ZrC添加量的增加而增加。 X射线衍射和能谱分析结果表明，明亮的球形晶粒是Zr含量较高的(Zr,Ti)C固溶体。随着ZrC含量的增加，相对密度、硬度和抗弯强度降低。然而，断裂韧性先略有增加，然后又下降。添加10%ZrC的金属陶瓷的耐热震性能最好，随着ZrC添加量的增加，其耐热震性能下降。还根据成分的物理参数计算金属陶瓷的参数Rst，以解释金属陶瓷的热冲击。
TiC–ZrC–Co–Ni cermets with different ZrC contents were prepared by vacuum sintering. Microstructure, mechanical properties and thermal shock resistance were investigated. The results show that bright spherical grains in the microstructure are observed and their relative amounts increase with increasing ZrC addition. X-ray diffraction and energy-dispersive spectrometry results indicate that bright spherical grains are (Zr, Ti)C solid solution with more Zr content. The relative density, hardness and transverse rupture strength decrease with the increase of ZrC content. The fracture toughness, however, increases a little and then decreases. Thermal shock resistance of the cermets with 10%ZrC is the best and then declines with more ZrC addition. The parameter Rstof the cermets is also calculated on the basis of the physical parameters of the constituents to interpret the thermal shock of the cermets.