Black phosphorus(BP)with a layered structure has been used gradually as a lubrication additive in the tribological area.In this study,BP powders are produced via an easy method of high-energy ball milling using red ph...Black phosphorus(BP)with a layered structure has been used gradually as a lubrication additive in the tribological area.In this study,BP powders are produced via an easy method of high-energy ball milling using red phosphorus as a raw material.Subsequently,BP nanosheets are prepared via liquid exfoliation in N-methyl pyrolidone solvent.The tribological behavior of BP nanosheets as water-based lubrication additives(BP-WL)is evaluated under Ti6Al4V(TC4)/GCr15 contact.The results suggest that the 70 mg/L BP-WL sample exhibits excellent lubrication performance,whose coefficient of friction(COF)and ball wear rate reduced by 32.4%and 61.1%,respectively,compared with those of pure water.However,as the load increased,the tribological properties of BP-WL reduced gradually because of the agglomeration of BP nanosheets.Based on tribological experiments and worn surface analysis,boundary lubrication mechanisms are proposed.The friction reduced,which is primarily attributed to the low interlaminar shear and adsorption of BP nanosheets.In addition,a tribochemical reaction film comprising TiO_(2),Al_(2)O_(3),and Fe_(2)O_(3)effectively protects the surface of titanium alloy/steel from wear.This new water-based lubrication additive can be used to process titanium alloys.展开更多
A S-containing additive, sulfuration modified rapeseed oil （named as SRO）, was prepared by chemical modification of rapeseed oil with sulfur compounds. The results indicate that the friction and wear of the magnesiu...A S-containing additive, sulfuration modified rapeseed oil （named as SRO）, was prepared by chemical modification of rapeseed oil with sulfur compounds. The results indicate that the friction and wear of the magnesium alloy-steel tribomates could be effectively reduced by formulating SRO into rapeseed oil lubricant. The friction coefficients and the wear volumes of magnesium alloy decrease with increasing contents of SRO. The surface lubricated with SRO-doped rapeseed oil was characterized by less wear as compared with that lubricated with neat rapeseed oil. The enhanced anti-wear and friction-reducing abilities of rapeseed oil by SRO in the lubrication of magnesium alloy against steel were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of SRO and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with magnesium alloy.展开更多
基金The authors gratefully thank the financial support from the Research Fund of the National Natural Science Foundation of China(Grant Nos.51975450 and 51705277).
文摘Black phosphorus(BP)with a layered structure has been used gradually as a lubrication additive in the tribological area.In this study,BP powders are produced via an easy method of high-energy ball milling using red phosphorus as a raw material.Subsequently,BP nanosheets are prepared via liquid exfoliation in N-methyl pyrolidone solvent.The tribological behavior of BP nanosheets as water-based lubrication additives(BP-WL)is evaluated under Ti6Al4V(TC4)/GCr15 contact.The results suggest that the 70 mg/L BP-WL sample exhibits excellent lubrication performance,whose coefficient of friction(COF)and ball wear rate reduced by 32.4%and 61.1%,respectively,compared with those of pure water.However,as the load increased,the tribological properties of BP-WL reduced gradually because of the agglomeration of BP nanosheets.Based on tribological experiments and worn surface analysis,boundary lubrication mechanisms are proposed.The friction reduced,which is primarily attributed to the low interlaminar shear and adsorption of BP nanosheets.In addition,a tribochemical reaction film comprising TiO_(2),Al_(2)O_(3),and Fe_(2)O_(3)effectively protects the surface of titanium alloy/steel from wear.This new water-based lubrication additive can be used to process titanium alloys.
基金Project (50975282) supported by the National Natural Science Foundation of China
文摘A S-containing additive, sulfuration modified rapeseed oil （named as SRO）, was prepared by chemical modification of rapeseed oil with sulfur compounds. The results indicate that the friction and wear of the magnesium alloy-steel tribomates could be effectively reduced by formulating SRO into rapeseed oil lubricant. The friction coefficients and the wear volumes of magnesium alloy decrease with increasing contents of SRO. The surface lubricated with SRO-doped rapeseed oil was characterized by less wear as compared with that lubricated with neat rapeseed oil. The enhanced anti-wear and friction-reducing abilities of rapeseed oil by SRO in the lubrication of magnesium alloy against steel were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of SRO and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with magnesium alloy.
