HVOF制备纳米WC-10Co4Cr涂层的微观组织及抗冲蚀性能

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摘要为提高水轮机表面抗泥沙冲蚀性能,本实验采用超音速火焰喷涂技术(HVOF)在不锈钢(0Cr13Ni5Mo)基体上分别制备微米和纳米结构的WC-10Co4Cr涂层。通过扫描电子显微镜(SEM)分析不同结构WC-10Co4Cr粉末和涂层的微观组织结构,并对涂层的显微硬度、结合强度和抗冲蚀性能进行对比,探讨涂层泥沙冲蚀机理。结果表明：HVOF制备的纳米结构 WC-10Co4Cr涂层组织致密,涂层的显微硬度、结合强度高于微米涂层,冲蚀质量损失远小于微米涂层;纳米结构可细化涂层晶粒,增强涂层的显微硬度和韧性,提高涂层的抗微切削和抗疲劳剥落性能,有利于涂层的抗泥沙冲蚀性能。

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	周夏凉
	陈小明
	吴燕明
	赵坚
	刘伟
	毛鹏展
	王莉容

关键词 ：超音速火焰喷涂, WC-10Co4Cr, 微米结构涂层, 纳米结构涂层, 泥沙冲蚀

Abstract：To improve the slurry erosion resistance of turbine surface, nano-structured and micro-structured WC- 10Co4Cr coatings were prepared on stainless steel (0Cr13Ni4Mo) surface by HVOF. Microstructure of powders and coatings with different structure were characterized by scanning electron microscopy (SEM). The micro-hardness, bonding strength and erosion resistance were compared. Erosion failure mechanism in the sandy stream was analyzed as well. The results show that the microstructure of nano-structured WC-10Co4Cr coating prepared by HOVF is dense. Its microhardness and bond strength are higher than that of conventional coating. As well, it is found that nano-structured coating exhibits lower erosion mass loss than that of micro-structure coating. Nano-structure coating has finer grains, higher microhardness and toughness, and better micro-cutting resistance and anti-fatigue spalling properties, and can enhance the slurry erosion resistance of the coating.

Key words： HVOF WC-10Co4Cr micro-structured coating nano-structured coating slurry erosion

收稿日期: 2017-09-26 出版日期: 2019-07-12

ZTFLH:

TG174.442

基金资助:浙江省科技计划项目(2017C37048,2016C37091); 杭州市科技发展计划项目(20162231E10)

通讯作者: 周夏凉,工程师。电话：071-88082819;E-mail: xlzhou16@126.com

引用本文:

周夏凉, 陈小明, 吴燕明, 赵坚, 刘伟, 毛鹏展, 王莉容. HVOF制备纳米WC-10Co4Cr涂层的微观组织及抗冲蚀性能[J]. 粉末冶金材料科学与工程, 2018, 23(2): 124-129.
ZHOU Xialiang, CHEN Xiaoming, WU Yanming, ZHAO Jian, LIU Wei, MAO Pengzhan, WANG Lirong. Microstructure and erosion resistance of nanostructured WC-10Co4Cr coating sprayed by HVOF. Materials Science and Engineering of Powder Metallurgy, 2018, 23(2): 124-129.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I2/124

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