引用本文:勾俊峰,杨鑫,张世宏,杨阳,张小锋,王冠,刘江文,王铀,张永康.Cr2O3对Al2O3-Cr2O3涂层干滑动摩擦磨损行为的影响*[J].中国表面工程,2022,34(2):176~186
GOU Junfeng,YANG Xin,ZHANG Shihong,YANG Yang,ZHANG Xiaofeng,WANG Guan,LIU Jiangwen,WANG You,ZHANG Yongkang.Dry Sliding Wear Behaviour of Al2O3-Cr2O3 Coatings with Different Contents of Cr2O3[J].China Surface Engineering,2022,34(2):176~186
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Cr2O3对Al2O3-Cr2O3涂层干滑动摩擦磨损行为的影响*
勾俊峰1, 杨鑫1, 张世宏2, 杨阳2, 张小锋3, 王冠1, 刘江文4, 王铀5, 张永康1
1.广东工业大学机电工程学院 广州 510006;2.安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室 马鞍山 243000;3.广东省科学院新材料研究所现代材料表面工程技术国家工程实验室 广州 510650;4.广东工业大学省部共建精密电子制造技术与装备国家重点实验室 广州 510006;5.哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
摘要:
Cr2O3对 Al2O3-Cr2O3复合涂层与高硬度陶瓷接触时的摩擦磨损行为及磨损机制的影响尚未揭示。采用大气等离子喷涂的方法制备 Cr2O3含量不同的 Al2O3-Cr2O3复合涂层以研究 Cr2O3的影响机制。试验结果表明：Cr2O3明显减少了涂层的微观孔隙；复合涂层中 α-Al2O3 / γ-Al2O3的相对含量比明显高于 Al2O3 层中的 37%；Al2O3-40%Cr2O3涂层的硬度与 Al2O3涂层相比提高了 48%，断裂韧性是 Al2O3涂层的 2 倍多；当载荷为 5 N、10 N 和 15 N 时，Al2O3-40%Cr2O3复合涂层的摩擦因数最低，磨损率依次降低 60%、85% 和 79%。但是当载荷为 20 N 时，Al2O3-20%Cr2O3复合涂层的摩擦因数最低，磨损率降低了 50%。微观脆性断裂是涂层的主要磨损机制。复合涂层耐滑动磨损性能与 Cr2O3含量及磨损条件是密切相关的。微观结构、硬度、断裂韧性、导热系数等是影响 Al2O3-Cr2O3 复合涂层耐磨损性能的重要因素。研究结果可为高耐磨性 Al2O3基涂层的设计和应用提供指导。
关键词:  大气等离子喷涂  Al2O3-Cr2O3复合涂层  摩擦因数  耐磨损性能
DOI：10.11933/j.issn.1007-9289.20211019002
分类号:TG174
基金项目:国家自然科学基金(52175387)；广东省科学院百名青年(2020GDASYL-20200104030)；防城港科技计划(AB20014009)资助项目
Dry Sliding Wear Behaviour of Al2O3-Cr2O3 Coatings with Different Contents of Cr2O3
GOU Junfeng1, YANG Xin1, ZHANG Shihong2, YANG Yang2, ZHANG Xiaofeng3, WANG Guan1, LIU Jiangwen4, WANG You5, ZHANG Yongkang1
1.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006 , China;2.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education,Anhui University of Technology, Ma’ anshan 243002 , China;3.National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute ofNew Materials, Guangdong Academy of Sciences, Guangzhou 510650 , China;4.State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment,Guangdong University of Technology, Guangzhou 510006 , China;5.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 , China
Abstract:
The effect of Cr2O3 on the friction and wear behaviour and wear mechanism of Al2O3-Cr2O3 composite coating sliding against ceramic ball with high hardness is still unknown. Atmospheric plasma spraying is used to deposit Al2O3-Cr2O3 composite coatings with different contents of Cr2O3 to reveal its influential mechanism. The experimental results show that Cr2O3 decreases the voids in the coating obviously. The relative α-Al2O3 / γ-Al2O3 content ratios in the composite coatings are larger than 37%. The micro-hardness of Al2O3-40%Cr2O3 composite coating increases by 48% compared with Al2O3 coating, the fracture toughness of which is twice as large as that of Al2O3 coating. Al2O3-40%Cr2O3 composite coating has lower friction factor and wear rates when the wear loads are 5 N, 10 N and 15 N than Al2O3 coating, their wear rates decrease by 60%, 85% and 79% compared with those of Al2O3 coating. But when the wear load is 20 N, Al2O3-20%Cr2O3 composite coating has lower friction factor than Al2O3 coating, its wear rate decreases by 50% compared with that of Al2O3 coating. The main wear mechanism of the coatings is micro-fracture. The wear resistance of the composite coating is determined by the content of Cr2O3 and wear condition. Microstructure, hardness, fracture toughness and coefficient of thermal conductivity are important factors affecting the wear resistance of Al2O3-Cr2O3 composite coating. The research results can provide guidance for the design and application of Al2O3-based coating with high wear resistance.
Key words:  atmospheric plasma spraying  Al2O3-Cr2O3 composite coatings  friction factor  wear resistance
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