Zirconia-toughened WC with/without VC and Cr3C2
Zirconia-toughened WC with/without VC and Cr3C2
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DOI：
10.1016/j.ceramint.2013.07.111
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发表时间：
2014
影响因子：
5.2
通讯作者：
Donghai Zheng;Xiaoqiang Li;Yuanyuan Li;S. Qu;Chao Yang
中科院分区：
文献类型：
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作者：
Donghai Zheng;Xiaoqiang Li;Yuanyuan Li;S. Qu;Chao Yang
研究了Cr 3C 2和VC对WC-8wt%ZrO2复合材料的致密化行为、晶粒长大和力学性能的影响，并研究了力学性能与显微组织的关系。VC和Cr 3C 2的加入不仅延缓了WC-ZrO 2材料的致密化，而且显著抑制了WC晶粒和ZrO 2颗粒的长大。对于不含VC和Cr 3C 2的WC-ZrO 2复合材料，在高温下显微组织粗化导致硬度下降，而对于含有VC和Cr 3C 2添加剂的复合材料，由于显微组织保持精细，硬度保持在~22 GPa的高值。8wt%ZrO2增韧WC基材料的断裂韧性对显微组织的粗糙度不敏感，当添加VC和Cr 3C 2时，材料的断裂韧性可达11 MPa m1/2左右。
The effects of Cr3C2and VC on densification behavior, grain growth and mechanical properties of the WC-8 wt% ZrO2composites were investigated, and the relationship between the mechanical properties and microstructure was studied. The addition of VC and Cr3C2not only retarded densification of the WC–ZrO2material, but also significantly suppressed the growth of WC-grains and ZrO2-particles. For the WC–ZrO2composite without VC and Cr3C2, microstructure coarsening at elevated temperatures caused degradation in hardness, whereas the hardness maintained a high value of ~22 GPa for the composite with VC and Cr3C2additives as the microstructure remained fine. The fracture toughness of the WC-based materials toughened by 8 wt% ZrO2seemed insensitive to the coarseness of microstructure, and achieved a value of ~11 MPa m1/2when VC and Cr3C2were added.