WC含量对TiB<sub>2</sub>基金属陶瓷微观组织与力学性能的影响

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摘要采用粉末冶金法制备w(WC)为0~20%的TiB₂-WC-0.8Cr₃C₂-20(Co/Ni) (质量分数,%)金属陶瓷,研究WC含量对TiB₂基金属陶瓷微观组织与力学性能的影响。结果表明,随WC含量增加,TiB₂在黏结相中的溶解度降低,TiB₂/黏结相界面减少,使得TiB₂基金属陶瓷晶粒细化,晶粒尺寸更加均匀。此外,添加WC可显著改善TiB₂基金属陶瓷的力学性能。当w(WC)为15%时,金属陶瓷的性能最佳,硬度(HRA)、抗弯强度以及相对密度分别达到92.6±0.2、(1256±30) MPa和(99.65±0.20)%。但添加过量WC(w(WC)=20%)时部分WC相发生团聚并生成脱碳相W₂C,使得TiB₂基金属陶瓷的力学性能降低。

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	王帅
	汪建英
	娄嘉
	汪炯
	张翔
	杨海林

关键词 ：力学性能, 微观组织, TiB₂基金属陶瓷, WC添加, 晶粒细化

Abstract：The TiB₂-WC-0.8Cr₃C₂-20(Co/Ni) (mass fraction, %) cermets (w(WC) are 0-20%) with high-density were prepared by powder metallurgy (P/M) method. The effects of WC content on the microstructure and mechanical properties of TiB₂-based cermets were investigated. The results indicate that with the increase of WC content, the solubility of TiB₂ in the bonded phase decreases, and the TiB₂/ bonded phase interface decreases, which makes the grains of TiB₂ based cermets finer and more uniform. In addition, the addition of WC can significantly improve the mechanical properties of TiB₂ based cermets. When w (WC) is 15%, the properties of cermets are the best, and the hardness (HRA), bending strength and relative density reach 92.6±0.2, (1 256±65) MPa and (99.65±0.20)%, respectively. However, the addition of excessive WC (20%) will lead to the partial agglomeration of WC phase and the formation of decarburized phase W₂C, which will reduce the mechanical properties of TiB₂ based cermets.

Key words： mechanical properties microstructure TiB₂-based cermet WC addition grain refinement

收稿日期: 2021-02-22 出版日期: 2021-09-26

ZTFLH:

TG148

通讯作者: 杨海林,副教授,博士。E-mail: y-hailin@csu.edu.cn

引用本文:

王帅, 汪建英, 娄嘉, 汪炯, 张翔, 杨海林. WC含量对TiB₂基金属陶瓷微观组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2021, 26(4): 298-305.
WANG Shuai, WANG Jianying, LOU Jia, WANG Jiong, ZHANG Xiang, YANG Hailin. Effects of WC content on the microstructure and mechanical properties of TiB₂-based cermets. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 298-305.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I4/298

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