摘要
目的研究Al2O3含量对Al2O3-Ni复合涂层摩擦磨损性能的影响。方法采用大气等离子喷涂技术,在6082-T6铝合金基体表面分别制备Al2O3含量为30%、50%和70%的30%Al2O3-70%Ni、50%Al2O3-50%Ni、70%Al2O3-30%Ni复合涂层。对三种涂层的显微硬度和摩擦磨损性能进行对比研究,并分析原始粉末和涂层的相组成、涂层组织结构、磨损形貌和磨损机制。结果原始粉末中的部分α-Al2O3相在急冷条件下转变成γ-Al2O3新相,涂层中各衍射峰出现明显的宽化现象,有Al2O3非晶相生成。三种试样均由基体、打底层、涂层组成,基体与打底层之间有明显的分界面,打底层因与涂层化学成分相似使分界面不明显,层与层之间结合良好。涂层的显微硬度明显高于基体,约为基体硬度的4~5倍,且其随着Al2O3含量的增加而增加。在试验条件下,涂层的摩擦系数、磨痕宽度、磨损率均随着Al2O3含量的增加而减小,相较于30%Al2O3-70%Ni涂层,70%Al2O3-30%Ni涂层的摩擦系数降低了13%,磨损率降低了66.7%。30%Al2O3-70%Ni涂层磨损最严重,磨痕表面剥落明显,而50%Al2O3-50%Ni涂层与70%Al2O3-30%Ni涂层磨损后,磨痕表面产生大量即将剥落的"橘皮状"氧化物,磨损机制均为氧化磨损与粘着磨损的混合。结论 Al2O3-Ni复合涂层中增加Al2O3含量可以提高复合涂层的耐磨性。
The purpose of this paper is to study the effect of Al2O3 content on friction and wear properties of Al2O3-Ni composite coating.The 30wt.%Al2O3-70wt.%Ni,50%wt.Al2O3-50wt.%Ni,70wt.%Al2O3-30wt.%Ni composite coatings which contained 30%,50%and 70%Al2O3 were deposited on the 6082-T6 aluminum alloy surface by air plasma spraying.The microhardness,friction and wear properties of the three coatings were compared and the phase composition of the original powder and the coating,the coating microstructure,wear morphology and wear mechanism were analyzed.Part of the original powder ofa-Al2O3 phase were transformed into a new phase ofγ-Al2O3 under quench condition.Various diffraction peaks in the coating showed obvious broadening phenomenon.Meanwhile,the amorphous phase of Al2O3 generated.The three kinds of samples were composed of the substrate,the priming coating and the coating.There was an obvious interface between the substrate and the priming coating.While the interface between the priming coating and the coating was not obvious because of its similar chemical composition.The good bonding formed between the layers.The microhardness of the coating was significantly higher than the substrate,which was about 4~5 times of the substrate.What’s more,it increased with the increase of Al2O3 content.The friction coefficient,wear width and wear rate decreased with the raising of Al2O3 content under the test condition.Compared to the 30wt.%Al2O3-70wt.%Ni coating,the friction coefficient and the wear rate of the 70wt.%Al2O3-30wt.%Ni coating reduced by 13%and 66.7%,respectively.The 30wt.%Al2O3-70wt.%Ni coating had the most serious wear,which with obvious peeling on the surface of wear scar,while 50wt.%Al2O3-50wt.%Ni coating and 70wt.%Al2O3-30wt.%Ni coating produced a large number of"orange dermatoid"oxide.The wear mechanism was a mixture of oxidation wear and adhesive wear.The wear resistance of Al2O3-Ni composite coating can be improved by increasing Al2O3 content.
作者
邵若男
贺甜甜
杜三明
王家威
蔡宏章
张永振
SHAO Ruo-nan;HE Tian-tian;DU San-ming;WANG Jia-wei;CAI Hong-zhang;ZHANG Yong-zhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第4期173-179,共7页
Surface Technology
基金
国家自然科学基金(51905153)
清华大学摩擦学国家重点实验室开放基金资助项目(SKLTKF18B14)。
