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The thermal stability and tribological properties of cadmium dithiomolybdenate at evaluated temperature

Science China Mathematics 2001年第S1期44卷 163-170页

作者： LIU Weimin FENG Dapeng State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China Chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Solid Lubricat Lanzhou 730000 Peoples R China

CdMoO_2S_2 H_2O was synthesized in laboratory. Its thermal stability was investigated by means of Th ermog ravimetric analysis (TGA), and its tribological characteristics at temperatures up to 500℃ were examined by sliding a Sialon ceramic and GCr15(AIS152100) steel ball against a W18Cr4V(AISI T1) steel disc on a high temperature ball-on-disc tribometer. The morphologies of and the elemental distributions in the worn surfaces of the ceramic and GCr15 ball were observed and determined by scanning electron microscopy (SEM) equipped with energy dispersion spec- trometry (EDS). The chemical states of some typical elements in the worn surfaces of the ceramic ball and steel ball were explored with X-ray photoelectron spectroscopy (XPS). As the results, CdMoO_2S_2 showed good lubricity for Sialon ceramic/W18Cr4V steel and GCr15/W18Cr4Vpair from room temperature to 400℃. The XPS analytical results indicate that CdMoO_2S_2 experienced tribochemical reactions during the friction process at 300℃, thereby generating S and Mo of higher valence for both pair. While for GCr15/W18Cr4V pair, produced MoS_2. SEM observations of the worn surfaces of the Sialon ceramic and GCr15 ball show that a surface protective film composed of the lubricants and their decomposed products was formed thereon, which contributes to keep the sliding surfaces off contact and abate the adhesion and scuffing on the lubricated surfaces, therefore to decrease the friction coefficients.

关键词： cadmium dithiomolybdenate high temperature tribochemical reaction transfer film

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