Effect of WC on Microstructure and Mechanical Properties of TiC-based Cermets
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摘要: 结合BSE显微组织观察、EDS能谱分析、XRD物相分析和力学性能测试,研究了WC添加剂含量对TiC基金属陶瓷显微组织和力学性能的影响规律。结果表明,添加WC后TiC基金属陶瓷的硬质相包括白芯—灰环结构和黑芯—灰环结构,均为面心立方晶体结构。WC含量的增加有利于促进TiC基金属陶瓷显微组织中白芯—灰环结构的形成,进而提高材料的力学性能。但是随着WC含量的增加,溶解到粘结相中的碳化物含量增多,降温阶段析出的灰色环相厚度增加明显,脆性包覆环相不利于材料力学性能的提高。当WC含量为6%时TiC基金属陶瓷的力学性能最佳。Abstract: The effect of WC addition amount on the microstructure and mechanical properties of the TiC-based cermet was investigated using BSE,EDS and XRD.The results show that the hard phase of the cermet with WC added is constituted of white core-grey rim phase and black core-grey rim phase,both of which are face-centered cubic structure.Increase in the WC addition favors the formation of white core–gray rim phase in the cermet,enhancing the mechanical properties of the cermet.However,with increase of the WC addition,the carbides dissolved in the binder phase increase,and grey rim phases which are formed during the cooling process tend to be coarse in the cermet.The coated grey rim phases are brittle and are not conducive to the improvement of mechanical properties of the cermet.TiC-based cermet with the optimum mechanical properties can be obtained with 6% of WC addition.
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Key words:
- cermet /
- TiC /
- WC addition /
- microstructure /
- mechanical properties
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