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	Mechanochemical additive-assisted reconditioning effects and mechanism on worn ferrous surfaces
	Jin Yaansheng ; Yang He ; Li Shenghua
	2010-05-10 ; 2010-05-10
会议名称	AUTOMOTIVE LUBRICANT TESTING AND ADDITIVE DEVELOPMENT ; Symposium on Automotive Lubricant Testing and Advanced Additive Development ; Lake Buena Vista, FL ; Web of Science
关键词	lubricant additives nanocrystalline layer surface modification catalysis mechanical alloying mechanochemical reaction CRYSTAL-CHEMICAL APPROACH LUBRICATION Engineering, Mechanical Materials Science, Characterization & Testing
中文摘要	An additive package of reconditioning functionality for worn ferrous surfaces has been designed in light of the mechanochemical reaction principle. The package is formulated from a fine-powdery multicomponent mixture of Serpentine minerals, surfactants, and catalysts. The main reconditioning component in the package is magnesium silicate hydroxide (Mg-6(Si4O10)(OH)(8)), with the surfactants for dispersing the main component into bulk lubricant and the catalysts for facilitating interfacial mechanochemical reactions, particularly oil pyrolysis and carbonization. With commercial fully-formulated engine oils as benchmark, the reconditioning effects of the reconditioner package have been demonstrated in both laboratory tribotestings and in real-world heavy-duty (locomotive diesel engine) scenarios. Surface examination of sampled worn surfaces on both laboratory test specimens and cylinder bore of locomotive diesel engine has shown that a nano-crystalline layer has been generated which possesses nanometric roughness, higher surface hardness, and proper H/E ratio. Advanced analyses have indicated that the layer is composed of Fe3O4 and FeOOH nanoparticles which are dispersed on the Fe-C matrix. The smoother surface mitigates asperity interlocking which would otherwise induce high friction; the high surface hardness and appropriate H/E ratio result in less elastic deformation within nanocrystalline contact regions, which effectively lessens friction and wear arisen from plastic plowing and adhesion. Further characterization of sampled worn cylinder bore surface and analysis of used oils have suggested that generation of the nanocrystalline layer in presence of Mg-6(Si4O10)(OH)(8) involves three interwoven processes: oxidative mechanical polishing, lubricant carbonization and graphitization, and mechanical alloying.
会议录出版者	AMERICAN SOCIETY TESTING AND MATERIALS ; W CONSHOHOCKEN ; 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 USA
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/19162]
专题	清华大学
推荐引用方式 GB/T 7714	Jin Yaansheng,Yang He,Li Shenghua. Mechanochemical additive-assisted reconditioning effects and mechanism on worn ferrous surfaces[C]. 见:AUTOMOTIVE LUBRICANT TESTING AND ADDITIVE DEVELOPMENT, Symposium on Automotive Lubricant Testing and Advanced Additive Development, Lake Buena Vista, FL, Web of Science.

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