超音速火焰喷涂WC-10Co-4Cr涂层的微观组织与摩擦磨损性能

doi:10.11868/j.issn.1001-4381.2016.000770

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摘要

采用超音速火焰（High Velocity Oxygen Fuel，HVOF）喷涂技术在Q235钢基体上制备WC-10Co-4Cr涂层。利用透射电子显微电镜、扫描电子显微电镜、X射线衍射仪、显微硬度计、摩擦磨损试验机等手段对涂层的微观组织结构和摩擦磨损性能进行研究。结果表明：采用HVOF喷涂技术制备的WC-10Co-4Cr涂层结构致密，与基体结合良好，孔隙率为0.67%。涂层中的物相以WC为主，此外还含有少量W₂C相和非晶相。涂层的平均显微硬度为1230HV_0.3。WC-10Co-4Cr涂层具有良好的耐摩擦磨损性能，累计磨损量（14.4mg）仅为Cr12MoV冷作模具钢的2/5。磨粒磨损为WC-10Co-4Cr涂层的主要磨损机制。

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关键词 ：超音速火焰喷涂, WC-10Co-4Cr涂层, 组织, 摩擦磨损性能

Abstract：

WC-10Co-4Cr coating was prepared on Q235 steel substrate by high velocity oxygen fuel (HVOF) spray process. The microstructure and wear properties of the WC-10Co-4Cr coating were investigated by transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD), microhardness tester and friction-abrasion testing machine. The results show that the coating exhibits dense structure with the porosity of 0.67% and compact bonding with the substrate. The coating is mainly composed of WC, and a small amount of W₂C and amorphous phases as well, and the average microhardness of the coating is 1230HV_0.3. The cumulative mass loss of WC-10Co-4Cr coating is only 2/5 of the cold work die steel Cr12MoV, which indicates the WC-10Co-4Cr coating exhibits better abrasive properties. The abrasive wear is the main wear mechanism for the coating.

Key words： high velocity oxygen fuel spray WC-10Co-4Cr coating microstructure friction and wear property

收稿日期: 2016-06-22 出版日期: 2018-05-16

中图分类号:

TG174.44

基金资助:国家自然科学基金资助项目(51579087);国家自然科学基金资助项目(51609067);江苏省自然科学基金资助项目(BK20150806)

通讯作者: 吴玉萍 E-mail: wuyphhu@163.com

作者简介: 吴玉萍(1964-), 女, 教授, 博士, 研究方向为金属材料及表面工程, 联系地址:江苏省南京市江宁区佛城西路8号河海大学力学与材料学院(211100), E-mail:wuyphhu@163.com

引用本文:

杨伟华, 吴玉萍, 洪晟, 李佳荟, 李柏涛. 超音速火焰喷涂WC-10Co-4Cr涂层的微观组织与摩擦磨损性能[J]. 材料工程, 2018, 46(5): 120-125.
Wei-hua YANG, Yu-ping WU, Sheng HONG, Jia-hui LI, Bo-tao LI. Microstructure, Friction and Wear Properties of HVOF Sprayed WC-10Co-4Cr Coating. Journal of Materials Engineering, 2018, 46(5): 120-125.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000770 或 http://jme.biam.ac.cn/CN/Y2018/V46/I5/120

Fig.1 WC-10Co-4Cr粉末显微组织形貌

Table 1 HVOF喷涂工艺参数

Fig.2 WC-10Co-4Cr粉末和涂层的XRD谱图

Fig.3 WC-10Co-4Cr涂层的截面形貌

Fig.4 WC-10Co-4Cr涂层截面形貌(a)及A点和B点的能谱分析(b)

Fig.5 WC-10Co-4Cr涂层的TEM图像及选区衍射花样
(a)TEM图；(b), (c)A，B区的选区电子衍射花样

Fig.6 WC-10Co-4Cr涂层截面显微硬度

Fig.7 WC-10Co-4Cr涂层和Cr12MoV冷作模具钢摩擦因数

Fig.8 WC-10Co-4Cr涂层和Cr12MoV冷作模具钢累计磨损量

Fig.9 Czichos模型拟合曲线

Fig.10 WC-10Co-4Cr涂层(a)和Cr12MoV冷作模具钢(b)磨损后的表面形貌

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