Effect of the content of magnesium silicate hydroxide/supramoly in lubricant on tribological behavior of chromium-plated steel ball-grey cast iron friction pair
[Introduction]The service environment of piston rings in combustion engine is harsh,so it is necessary to provide good lubrication conditions to reduce their wear loss.[Method]A hard chromium coating was electroplated on 2Cr13 steel ball,and its morphology,microhardness,and thickness were examined.Friction and wear tests of the chromium-plated steel ball against gray cast iron were conducted to simulate the service environment of piston rings.The tribological behaviors of chromium-plated steel ball and gray cast iron in presence of lubricant with different mass concentrations of magnesium silicate hydroxide/supramoly(MSH/MoS2)as additive were studied.[Result]The hard chromium coating had some microcracks with a high microhardness up to(1013.7±32.4)HV and an average thickness of(84.2±3.6)μm.The lubricant containing MSH/MoS2 nanoparticles 1.0%by mass showed the best anti-friction and anti-wear performance on the chromium-plated steel ball-gray cast iron friction pair.As compared with the friction under pure lubricant,the average friction coefficient of chromium-plated steel ball and the diameter of wear spot on it were decreased by 28.2%and 24.2%,respectively,while the wear rate of gray cast iron was also decreased by 23.1%.[Conclusion]The addition of an appropriate amount of MSH/MoS2 nanoparticles to lubricant has good anti-friction and anti-wear effect on the chromium-plated steel ball-gray cast iron friction pair.
piston ringhard chromium electroplatingservice environmentmagnesium silicate hydroxidesupramolylubricantanti-friction and anti-wear
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