Friction-Induced Transformation of Monoalcohols to Amorphous Carbon and Its Friction-Reducing and Wear-Resistant Properties
[Objective]In order to investigate the lubricity of methanol and isopropanol under the same load and the different rotational speed,and the effect of rotational speed on the lubricity is mainly emphasize investigated.[Method]The tribological properties of methanol and isopropanol under 98 N,400,500 r/min and 600 r/min are conducted using four-ball wear machine.[Result]The experimental results show that in terms of lubrication sys-tem of methanol,the run-in stage is shortened with increasing rotational speed,and the smallest wear scar diame-ter is obtained at 500 r/min.In terms of the lubrication system of isopropanol,friction coefficient is kept the con-stant with increasing the rotational speed,but the wear scar diameter initially decreases and then increases with increasing rotational speed,and the smallest one is obtained at 500 r/min.[Conclusion]The low friction and wear of the lubrication system of methanol is attributed to the micro-bearing consisting of tungsten oxide(WO2 and WO3),methanol,friction-induced amorphous carbon and tribo-pairs.And the excellent tribological perfor-mance of the tribosystem of isopropanol is assigned to the effect of amorphous carbon with lubricity that induced by tribochemistry.Combination of optical microscope,Raman spectra,transition electron microscope,the lubri-cation mechanism of methanol and isopropanol is well investigated.The research results can provide references for the application of alcohols in the field of precision equipment.
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