摘要
为了降低WC-12Co耐磨涂层的摩擦系数,采用4种制粉工艺(湿法球磨、湿法搅拌、烧结破碎、喷雾造粒)将石墨烯复合于WC-12Co粉末中,采用爆炸喷涂技术制备了石墨烯自润滑耐磨涂层。利用SEM、EDS、Raman等分析了不同制粉工艺获得粉末及涂层中石墨烯的组织形貌、物相组成。利用显微硬度计、万能拉伸机研究了涂层的力学性能。利用UMT-3摩擦磨损试验机研究了涂层的摩擦磨损性能。结果表明,喷雾造粒工艺制备的复合粉末中石墨烯在WC-12Co颗粒表面均匀、紧密粘附,涂层内部石墨烯含量较高,且仍以透明状、薄层状态嵌合在组织内部,结合强度约68 MPa,硬度HV0.3约9400 MPa,相比原始WC-12Co涂层,石墨烯改性涂层摩擦系数降低约25%,石墨烯在摩擦过程中不断裸露于磨痕表面,在微区内形成润滑膜,起到较好的自润滑、减磨效果。
Aiming to reduce the friction coefficient of WC-12 Co wear-resistant coating, a self-lubricating coating was developed by adding graphene to WC-12 Co coating deposited via detonation gun spraying. In this study, four powder processes, including wet ball milling, wet mixing, spray granulation, and sintering and crushing, were used to obtain graphene/WC-12 Co composite powders. The microstructure and phase composition of graphene in powder and coating were analyzed by SEM, EDS and Raman. The mechanical properties of the coating were studied by the microhardness tester and the universal tensile machine. Results show that the spray granulation process is used to prepare the composite powder, a greater amount of graphene covers the surface of the WC-12 Co powder, and the transparent thin-layered structure of the graphene remains unchanged. The bonding strength and hardness(HV0.3) of the resultant coating are approximately 68 MPa and 940, respectively. Graphene modification causes a 25% reduction in the friction coefficient. During the friction process, the graphene constantly forms a lubricating film that serves as an excellent self-lubricating layer.
作者
田浩亮
王长亮
郭孟秋
汤智慧
高俊国
崔永静
梁义
童辉
魏世丞
徐滨士
Tian Haoliang;Wang Changliang;Guo Mengqiu;Tang Zhihui;Gao Junguo;Cui Yongjing;Liang Yi;Tong Hui?;Wei Shicheng;Xu Binshi(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Av iation Material Beijing,Beijing Institute of Aeronautical Materials,Beijing 100095,China;National Key Laboratory for Remanufacturing,Academy of PLA Armored Forces Engineering,Beijing 100072,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第3期1058-1067,共10页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51605455)。
关键词
制粉工艺
爆炸喷涂
石墨烯
自润滑
耐磨性能
powder milling process
detonation gun spraying
graphene
self-lubricating
wear resistance
作者简介
田浩亮,男,1986年生,博士,高级工程师,中国航发北京航空材料研究院,航空材料先进腐蚀与防护航空科技重点实验室,北京100095,电话:010-62496449,E-mail:haoliangtian@163.com。
