摘要
采用超音速火焰喷涂技术(HVOF)在ZL101A铝合金表面制备WC-10Co4Cr涂层,研究了涂层经300℃×1 h、400℃×1 h和500℃×1 h真空热处理后的组织结构、硬度以及摩擦磨损性能。研究表明:经真空热处理后,涂层中的非晶相逐渐转变成CrSi_(2)相和Co_(25)Cr_(25)W_(8)C_(2)相,且热处理温度越高,涂层中上述两相含量越多;随着热处理温度的升高,涂层的显微维氏硬度逐渐增大,而微动摩擦的磨痕与体积损失逐渐下降;未热处理的涂层磨损机制主要是疲劳磨损和磨粒磨损两种,热处理后的涂层同时存在疲劳磨损、磨粒磨损和黏着磨损三种机制。
The WC-10Co4Cr coating was prepared on the surface of ZL101A aluminum alloy by hypersonic flame spraying technology(HVOF).The microstructure,hardness and friction and wear properties of the coatings after vacuum heat treatment at 300℃×1h,400℃×1h and 500℃×1h were studied.The research shows that:after vacuum heat treatment,the amorphous phase in the coating gradually transforms into CrSi_(2) phase and Co_(25)Cr_(25)W_(8)C_(2) phase,and the higher the heat treatment temperature,the more the content of the above two phases in the coating;with the increase of heat treatment temperature,the micro-Vickers hardness of the coating gradually increased,while the wear scar and volume loss of fretting friction gradually decreased;the wear mechanisms of coatings without heat treatment are mainly fatigue wear and abrasive wear,while the coatings after heat treatment have three mechanisms of fatigue wear,abrasive wear and adhesive wear.
作者
王志辉
简忠武
孙忠刚
刘国刚
WANG Zhi-hui;JIAN Zhong-wu;SUN Zhong-gang;LIU Guo-gang(College of Automotive Engineering,Hunan Industry Polytechnic,Changsha 410208,China;Vocational Secondary Vocational School in Wangcheng District,Changsha 410200,China)
出处
《机械工程与自动化》
2022年第4期127-130,共4页
Mechanical Engineering & Automation
基金
湖南省自然科学基金项目(2019JJ70082)。
