The friction and wear properties,as well as the scuffing resistance,of different piston-ring coatings mating with a chrome-plated cylinder liner were investigated.Interrupted wear tests under the lubricant starvation ...The friction and wear properties,as well as the scuffing resistance,of different piston-ring coatings mating with a chrome-plated cylinder liner were investigated.Interrupted wear tests under the lubricant starvation condition were conducted to examine the wear behavior of Cr-diamond coating(GDC)and diamond-like coating(DLC).The results indicated that the DLC coating had outstanding tribological properties(small coefficient of friction and wear loss)at 150°C,while the GDC coating exhibited better performance at an elevated temperature(240°C).The DLC coating had a better scuffing resistance;no material adhesion occurred for 70 min under the unlubricated condition.The interrupted wear behaviors revealed that the scuffing process of the GDC coating involved the consumption of lubricant oil with relatively stable wear,a reduction in the friction force,and the occurrence of scuffing,in sequence.In contrast,although the friction force also increased after a short period of weak friction,no scuffing was observed.This is attributed to the formation of a mixed oxide and graphitic C tribolayer.展开更多
The radial surface coating layer of compression piston rings is used to improve their wear resistance during the internal combustion engine operation.However,at top dead centers,the friction coefficient of the piston ...The radial surface coating layer of compression piston rings is used to improve their wear resistance during the internal combustion engine operation.However,at top dead centers,the friction coefficient of the piston ring–cylinder liner pair is detrimental to the engine’s tribological performance.In this work,dimples with different texture dimensions and densities were tested in a home-developed tribometer.The friction coefficient was measured for all samples,and for those with the best results,their wear resistance was assessed.The texture with an aspect ratio of 0.25 and a density area of 15%reported the best tribological results.展开更多
Ⅰ. Current Situation At present, there are more than 100 piston and/or piston ring manufacturers all over China, and the figure is continuously rising. Among them, some manufacturers are specialized or mainly engaged...Ⅰ. Current Situation At present, there are more than 100 piston and/or piston ring manufacturers all over China, and the figure is continuously rising. Among them, some manufacturers are specialized or mainly engaged in the production of pistons, e. g. Shanghai Piston Plant, Shandong Piston Plant, etc.; some manufacturers are specialized or展开更多
基金This research was supported by the Natural Science Foundation of Liaoning Province(2019-ZD-0165 and 2020-HYLH-47)the China Postdoctoral Science Foundation(2020M670729)the National Natural Science Foundation of China(51979018).
文摘The friction and wear properties,as well as the scuffing resistance,of different piston-ring coatings mating with a chrome-plated cylinder liner were investigated.Interrupted wear tests under the lubricant starvation condition were conducted to examine the wear behavior of Cr-diamond coating(GDC)and diamond-like coating(DLC).The results indicated that the DLC coating had outstanding tribological properties(small coefficient of friction and wear loss)at 150°C,while the GDC coating exhibited better performance at an elevated temperature(240°C).The DLC coating had a better scuffing resistance;no material adhesion occurred for 70 min under the unlubricated condition.The interrupted wear behaviors revealed that the scuffing process of the GDC coating involved the consumption of lubricant oil with relatively stable wear,a reduction in the friction force,and the occurrence of scuffing,in sequence.In contrast,although the friction force also increased after a short period of weak friction,no scuffing was observed.This is attributed to the formation of a mixed oxide and graphitic C tribolayer.
基金supported by Fundação para a Ciência e Tecnologia(FCT)and MAHLE,Componentes de Motores,S.A.through the grant SFRH/BDE/110654/2015by the project Add-Additive with the reference POCI-01-0247-FEDER-024533.
文摘The radial surface coating layer of compression piston rings is used to improve their wear resistance during the internal combustion engine operation.However,at top dead centers,the friction coefficient of the piston ring–cylinder liner pair is detrimental to the engine’s tribological performance.In this work,dimples with different texture dimensions and densities were tested in a home-developed tribometer.The friction coefficient was measured for all samples,and for those with the best results,their wear resistance was assessed.The texture with an aspect ratio of 0.25 and a density area of 15%reported the best tribological results.
文摘Ⅰ. Current Situation At present, there are more than 100 piston and/or piston ring manufacturers all over China, and the figure is continuously rising. Among them, some manufacturers are specialized or mainly engaged in the production of pistons, e. g. Shanghai Piston Plant, Shandong Piston Plant, etc.; some manufacturers are specialized or
