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friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES

friction 2020年第5期8卷 874-881页

作者： Ganlin ZHENG Tongmei DING Songhong PANG Lei ZHENG Tianhui REN Key Laboratory for Thin Film and Microfabrication of the Ministry of Education School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100039China

The effects of friction conditions, such as rotational speed, frictional time, and applied load, on the evolution mechanism of sulfide and sulfate on the top and bottom layers of tribofilm were investigated by total electron yield (TEY) and fluorescence yield (FY) mode X-ray absorption near-edge structure (XANES) spectra in the same beam line (4B7A). The results demonstrated that the top and bottom layers of tribofilms were covered by sulfide and sulfate. The addition of dialkylpentasulfide (DPS) could form complex nonuniform tribofilm. In addition, the friction condition (speed, load, or time) has its unique role in the generation of sulfide and sulfate at a specific depth on the tribofilm surface. The enhancement of friction conditions could promote the sulfur tribochemical reaction in a comparatively large range and alter the relative intensity of sulfurization and the sulfur-oxidizing process.

关键词： sulfur X-ray absorption near-edge structure(XANES) friction condition tribochemical process

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Variation of the friction conditions in cold ring compression tests of medium carbon steel

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friction 2020年第2期8卷 311-322页

作者： Dawei ZHANG Bingkun LIU Jingxiang LI Minchao CUI Shengdun ZHAO School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Lubrication and friction conditions vary with deformation during metal forming *** macro-variations can be observed when a threshold of deformation is *** study shows that during the cold compression processing of#45(AISI 1045)steel rings,the magnitude of friction and surface roughness(Ra)changes significantly upon reaching a 45%reduction in ring *** example,the Ra of compressed ring specimens increased by approximately 55%immediately before and after reaching this threshold,compared to an 18% or 25%variation over a 35%-45%or a 45%-55%reduction in height,*** ring compression test conducted by this study indicates that the Coulomb friction coefficient and Tresca friction factor mare 0.105 and 0.22,respectively,when the reduction in height is less than 45%;and 0.11 and 0.24,respectively,when the reduction in height is greater than 45%.

关键词： friction condition ring compression test friction calibration curve surface topography

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