Formation of self-lubricating PEO coating via in-situ incorporation of PTFE particles

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	Formation of self-lubricating PEO coating via in-situ incorporation of PTFE particles
	Chen, Y; Lu, XP; Blawert, C; Zheludkevich, ML; Zhang, T; Wang, FH; Lu, XP (reprint author), Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany.; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Corros & Protect Div, Wencui Rd 62, Shenyang 110016, Liaoning, Peoples R China.
刊名	SURFACE & COATINGS TECHNOLOGY
	2018-03-15
卷号	337 页码:379-388
关键词	Plasma Electrolytic Oxidation Magnesium Alloy Az31 Mg Alloy Tribological Properties Ceramic Coatings Ti6al4v Alloy Behavior Wear Improvement Composites
ISSN号	0257-8972
英文摘要	Self-lubricating plasma electrolytic oxidation (PEO) coatings have been fabricated on AZ91 magnesium alloy via in-situ incorporation of PTFE particles. Surfactants are used to improve dispersion stability of the particles in aqueous solution and relatively low energy input is applied to ensure the particles are inertly incorporated into the coating. It was found that the porous layer has been sealed significantly and PTFE-enriched ridge-like protrusions can be obtained on the coating surface after sufficient treatment time. 3D surface micro-topography was reconstructed to disclose the uptake of the particles and wear mechanisms of the coatings. The particle containing protrusions can act as lubricant reservoirs, leading to ultra-low and stable friction coefficient between the coating and its counterpart during entire dry sliding wear test. The formation of the ridge-like protrusions is related to micro-sized gas bubbles adherence to the coating surface due to high viscosity of the electrolyte. As a consequence, the intensity of electric field at the edge of the bubbles increases, which could facilitate rapid sintering and accumulation of PTFE particles at the electrolyte/gas/coating interface.; Self-lubricating plasma electrolytic oxidation (PEO) coatings have been fabricated on AZ91 magnesium alloy via in-situ incorporation of PTFE particles. Surfactants are used to improve dispersion stability of the particles in aqueous solution and relatively low energy input is applied to ensure the particles are inertly incorporated into the coating. It was found that the porous layer has been sealed significantly and PTFE-enriched ridge-like protrusions can be obtained on the coating surface after sufficient treatment time. 3D surface micro-topography was reconstructed to disclose the uptake of the particles and wear mechanisms of the coatings. The particle containing protrusions can act as lubricant reservoirs, leading to ultra-low and stable friction coefficient between the coating and its counterpart during entire dry sliding wear test. The formation of the ridge-like protrusions is related to micro-sized gas bubbles adherence to the coating surface due to high viscosity of the electrolyte. As a consequence, the intensity of electric field at the edge of the bubbles increases, which could facilitate rapid sintering and accumulation of PTFE particles at the electrolyte/gas/coating interface.
学科主题	Materials Science, Coatings & Films ; Physics, Applied
语种	英语
资助机构	Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]; National Program for Young Top-notch Professionals; National Natural Science Foundation of China [U1737102, 51531007, 51771050]; Chinese Academy of Sciences; German Academic Exchange Service
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79426]
专题	金属研究所_中国科学院金属研究所
通讯作者	Lu, XP (reprint author), Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany.; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Corros & Protect Div, Wencui Rd 62, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Chen, Y,Lu, XP,Blawert, C,et al. Formation of self-lubricating PEO coating via in-situ incorporation of PTFE particles[J]. SURFACE & COATINGS TECHNOLOGY,2018,337:379-388.
APA	Chen, Y.,Lu, XP.,Blawert, C.,Zheludkevich, ML.,Zhang, T.,...&Zhang, T .(2018).Formation of self-lubricating PEO coating via in-situ incorporation of PTFE particles.SURFACE & COATINGS TECHNOLOGY,337,379-388.
MLA	Chen, Y,et al."Formation of self-lubricating PEO coating via in-situ incorporation of PTFE particles".SURFACE & COATINGS TECHNOLOGY 337(2018):379-388.