Actions for Mechanochemical Additive-Assisted Reconditioning Effects and Mechanism on Worn Ferrous Surfaces

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Mechanochemical Additive-Assisted Reconditioning Effects and Mechanism on Worn Ferrous Surfaces / Jin Yuansheng, Yang He, Li. Shenghua

Conference Author
Automotive Lubricant Testing and Advanced Additive Development (2006 : Lake Buena Vista, Florida)
Physical Description
1 online resource (13 pages) : illustrations, figures, tables
Additional Creators
Yuansheng, Jin, He, Yang, Shenghua, Li., American Society for Testing and Materials, and ASTM International
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Summary
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 (Mg6(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 Mg6(Si4O10)(OH)8 involves three interwoven processes: oxidative mechanical polishing, lubricant carbonization and graphitization, and mechanical alloying.
Dates of Publication and/or Sequential Designation
Volume 2008, Issue 1501 (January 2008)
Subject(s)
Other Subject(s)
ISBN
9780803162525 (e-ISBN)
9780803145054
0803145055
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 16.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2008. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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