原料中C/N原子比对TiCN基金属陶瓷组织结构和性能的影响

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摘要分别以Ti(C_0.4,N_0.6),Ti(C_0.5,N_0.5)和Ti(C_0.7,N_0.3)等3种TiCN粉末为原料,制备TiCN-25WC-10TaC-2Mo₂C- 7Ni-7Co金属陶瓷,研究TiCN原料中C/N原子比对TiCN基金属陶瓷组织结构、硬度、抗弯强度、韧性、磁学性能以及耐腐蚀性能的影响。结果表明,以Ti(C_0.4,N_0.6)为原料制备的TiCN基金属陶瓷中出现M₆C型脱碳相(η相),导致材料的抗弯强度和韧性显著降低。以Ti(C_0.7,N_0.3)为原料制备的金属陶瓷为典型的弱芯环结构,具有最佳的力学性能,硬度(HV30)、抗弯强度和Palmqvist韧性分别为15.61 GPa,2 294 MPa和11.29 MN•m^-3/2。随TiCN原料中C/N原子比降低,金属陶瓷的矫顽磁力和相对磁饱和均大幅降低。在pH=1的H₂SO₄溶液中的电化学腐蚀实验结果表明,采用Ti(C_0.4,N_0.6)和Ti(C_0.5,N_0.5)原料制备的金属陶瓷的耐腐蚀性能相近,采用Ti(C_0.7,N_0.3) 原料制备的金属陶瓷的耐腐蚀性能显著降低。

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	崔焱茗
	张立
	黄龙
	刘涛
	梁艳
	吴厚平
	熊湘君

关键词 ： TiCN基金属陶瓷, C/N原子比, 微观组织结构, 力学性能, 磁学性能, 电化学腐蚀

Abstract：Three kinds of TiCN-25WC-10TaC-2Mo₂C-7Ni-7Co cermets were prepared from TiCN powders with different C/N ratio, i.e., Ti(C_0.4,N_0.6), Ti(C_0.5, N_0.5) and Ti(C_0.7,N_0.3). The effects of C/N atomic ratio on the microstructure, hardness, transverse rupture strength, Palmqvist toughness, magnetic properties and corrosion resistance of TiCN-based cermets were investigated. The observation and analysis results show that there is a M₆C type decarburization phase (η phase) in the cermet with Ti(C_0.4,N_0.6) as the raw material, which results in a substantially decrease in transverse rupture strength and toughness. Microstructure of the cermet prepared from Ti(C_0.7,N_0.3) raw material shows a typical weak core-rim structure, which is accompanied by the best mechanical properties, i.e., 15.61 GPa for HV30, 2 294 MPa for transverse rupture strength and 11.29 MN•m^-3/2 for Palmqvist toughness. With the decrease of C/N ratio in the TiCN raw material, the coercivity force and relative magnetic saturation of cermet decrease rapidly. The results of electrochemical corrosion experiments in H₂SO₄ solution with pH=1 show that the corrosion resistance of cermets prepared from Ti(C_0.4,N_0.6) and Ti(C_0.5,N_0.5) is similar, and the corrosion resistance of cermets prepared from Ti(C_0.7,N_0.3) is significantly decreased.

Key words： Ti(C,N)-based cermet C/N atomic ratio microstructure mechanical property magnetic property electrochemical corrosion

收稿日期: 2019-10-08 出版日期: 2020-06-19

ZTFLH:

TG178

基金资助:湖南省自然科学基金资助项目(2019JJ40373); 国家自然科学基金资助项目(51574292); 粉末冶金国家重点实验室资助项目(2019zzkt05)

通讯作者: 张立,教授,博士。电话：0731-88876424;E-mail: zhangli@csu.edu.cn

引用本文:

崔焱茗, 张立, 黄龙, 刘涛, 梁艳, 吴厚平, 熊湘君. 原料中C/N原子比对TiCN基金属陶瓷组织结构和性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(1): 58-64.
CUI Yanming, ZHANG Li, HUANG Long, LIU Tao, LIANG Yan, WU Houping, XIONG Xiangjun. Effects of C/N atomic ratio in raw materials on the microstructure and properties of Ti(C,N)-based cermets. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 58-64.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I1/58

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