空间原子氧辐照对电刷镀Ni/MoS_2-C镀层组织结构及摩擦学性能的影响
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摘要
研究了空间原子氧对电刷镀Ni/MoS2-C固体润滑镀层的影响,通过SEM,EDS以及TEM观测了镀层的微观结构及成分,采用XRD确定了镀层的相结构,并利用MSTS-1多功能摩擦磨损试验机对比原子氧辐照不同时间后镀层摩擦学性能的变化情况。结果表明:原子氧对电刷镀Ni/MoS2-C复合镀层的氧化腐蚀作用明显,镀层中氧化产物MoO3增加,同时镀层表面氧化膜的存在使得其摩擦因数在实验初期阶段相对较低,镀层表面经一定能量的原子氧高速轰击后材料表面结构分布不均,进而在真空吸气作用下造成的应力变化导致微观裂纹数量增加且镀层致密性遭到一定程度的破坏,但氧化膜的存在有效地降低了镀层起始摩擦因数,原子氧的能量还不足以完全破坏Ni/MoS2-C镀层的摩擦学性能。
The effects of space atomic oxygen(AO)on the electricity Ni/MoS2-C lubricating coating by electricity brush plating were discussed.The microstructures,compositions and phase structures of the coating were analyzed by SEM,EDS,TEM and XRD.The tribological properties of the coating under different time of AO irradiation were tested by MSTS-1ultra-functional attrition testing machine.The results show that the AO has an obvious oxidation corrosion effect on the coating and the content of MoO3in the coating increases.Simultaneously,the friction coefficient is relatively low because of the existence of thin oxide film in the early stage of experiment.The structure of the coating surface is inhomogeneity due to the high speed impact of AO.In such a case,the cracks of coating surface increase and the density of the coating gets some degree of damage due to the variation of stresses caused by vacuum suction effect.However,the friction coefficient is reduced effectively because of the presence of thin oxide film.The energy of AO is not sufficient to completely destroy the tribological properties of Ni/MoS2-C coating.
The effects of space atomic oxygen(AO)on the electricity Ni/MoS2-C lubricating coating by electricity brush plating were discussed.The microstructures,compositions and phase structures of the coating were analyzed by SEM,EDS,TEM and XRD.The tribological properties of the coating under different time of AO irradiation were tested by MSTS-1ultra-functional attrition testing machine.The results show that the AO has an obvious oxidation corrosion effect on the coating and the content of MoO3in the coating increases.Simultaneously,the friction coefficient is relatively low because of the existence of thin oxide film in the early stage of experiment.The structure of the coating surface is inhomogeneity due to the high speed impact of AO.In such a case,the cracks of coating surface increase and the density of the coating gets some degree of damage due to the variation of stresses caused by vacuum suction effect.However,the friction coefficient is reduced effectively because of the presence of thin oxide film.The energy of AO is not sufficient to completely destroy the tribological properties of Ni/MoS2-C coating.
引文
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[2]沈志刚,赵小虎,王鑫.原子氧效应及其地面模拟试验[M].北京:国防工业出版社,2006.
[3]都亨,叶宗海.低轨道航天器空间环境手册[M].北京:国防工业出版社,1996.
[4]云海涛,梁波,季珩,等.离子喷涂铜-石墨复合涂层结构与干摩擦磨损性能研究[J].航空材料学报,2012,32(5):60-65.YUN Hai-tao,LIANG Bo,JI Heng,et al.Structure and dry tribology performance of plasma sprayed copper-graphite composite coating[J].Journal of Aeronautical Materials,2012,32(5):60-65.
[5]司洪娟,徐滨士,王海斗,等.纳米电刷镀In真空辐照环境下摩擦学性能研究[J].材料工程,2011,(2):79-86.SI Hong-juan,XU Bin-shi,,WANG Hai-dou,et al.Tribological properties research of nano-electro-brush plating in layer in vacuum radiation environment[J].Journal of Materials Engineering,2011,(2):79-86.
[6]闫来成,谭华玉,韩欢庆,等.一种低摩擦系数复合润滑膜的结构与性能研究[J].航空材料学报,2011,31(5):58-61.YAN Lai-cheng,TAN Hua-yu,HAN Huan-qing,et al.Study on property and structure of duplex lubricating film with lower friction coefficient[J].Journal of Aeronautical Materials,2011,31(5):58-61.
[7]DONNET C,MARTIN J M.Super-low friction of MoS2coating in various environments[J].Tribology International,1999,2(9):123-128.
[8]张森,李国禄,王海斗,等.电刷镀MoS2-C复合镀层摩擦学性能研究[J].材料工程,2013,(1):85-90.ZHANG Sen,LI Guo-lu,WANG Hai-dou,et al.Tribological properties of electric brush MoS2-C combination plating[J].Journal of Materials Engineering,2013,(1):85-90.
[9]刘秀波,刘海青,孟祥军,等.激光熔覆NiCr/Cr3-WS2自润滑耐磨涂层的高温摩擦学行为[J].材料工程,2013,(11):26-31.LIU Xiu-bo,LIU Hai-qing,MENG Xiang-jun,et al.High temperature tribological behaviors of laser cladding NiCr/Cr3C2-WS2secf-lubrication wear-resistant coating[J].Journal of Materials Engineering,2013,(11):26-31.
[10]DONNET C,MARTIN J M.Super-low friction of MoS2coating in various environments[J].Tribology International,1992,(2):66-71.
[11]章硕,胡树兵,陈文旗,等.灰铁基Cr-n-Al2O3复合电刷镀层的性能[J].材料工程,2012,(9):23-27.ZHANG Shuo,HU Shu-bing,CHEN Wen-qi,et al.Properties of Cr-n Al2O3composite coatings grown on grey cast iron substrates[J].Journal of Materials Engineering,2012,(9):23-27.
[12]LI Tao,LI Xiang,FENG Wei-quan.The effects of space atomic oxygen erosion on epoxy and silicone adhesives in LEO spacecraft[J].Spacecraft Environment Engineering,2009,6(3):222-224.
[13]SILVER E M.Space environment effect on spacecraft[J].LEO Material Selection Guide,1989,8(9):124-132.
[14]马国政,徐滨士,王海斗.多功能真空摩擦磨损试验机[P].中国专利:201110106243.X,2011-04-27.
[15]薛群基,徐兆,高玲.二硫化钼表面氧化行为的研究[J].摩擦学学报,1992,(2):66-71.XUE Qun-ji,XU Zhao,GAO Ling.Study on the surface oxidation behavior of MoS2[J].Tribology International,1992,(2):66-71.