高水基液压阀陶瓷摩擦副摩擦学性能研究

为选择适合的高水基乳化液液压阀摩擦副材料,探讨ZrO2与不同结构陶瓷组成的摩擦副在高水基乳化液润滑状态下的摩擦磨损特性。采用摩擦磨损试验机,在不同载荷和滑动速度下,研究在高水基乳化液介质中4种不同陶瓷材料（ZrO2、Al2O3、Si3N4和SiC）分别与ZrO2配副的摩擦学性能,并探讨不同组合陶瓷摩擦副的磨损机制。结果表明：在高水基乳化液中,各陶瓷的摩擦因数均随着滑动速度的增大而降低,其中Al2O3陶瓷的摩擦因数最小;ZrO2、Al2O3和Si3N4陶瓷的摩擦因数受载荷的影响较小,SiC陶瓷的摩擦因数则随着载荷的增大而骤增;各陶瓷的磨损体积都随着速度和载荷的增大而增大,其中Al2O3/ZrO2陶瓷摩擦副的磨损体积最小,其磨损机制以磨粒磨损和微疲劳磨损为主。研究表明,在不同工况下,Al2O3与ZrO2陶瓷配副的摩擦因数和磨损体积均为最低值,更适合作为高水基乳化液液压阀的摩擦副材料。

Study on Tribological Properties of Ceramic Friction Pair for High Water-based Hydraulic Valve

To select suitable friction pair materials for high water-based emulsion hydraulic valves,the friction and wear characteristics of the friction pairs composed of ZrO2 and different structural ceramics under high water-based emulsion lubrication were investigated.By using friction and wear tester,the tribological properties of four different ceramic materials (ZrO2,Al2O3,Si3N4,and SiC) sliding against ZrO2 ceramic in a high water-based emulsion medium were studied under different loads and sliding speeds.The wear mechanism of different combinations of ceramic friction pairs was analyzed.The results show that the friction coefficient of each ceramic decreases with the increase of sliding speed in a high water-based emulsion,and the friction coefficient of Al2O3 ceramic is the smallest.The friction coefficient of ZrO2,Al2O3,and Si3N4 is less affected by the load,while the friction coefficient of SiC ceramic increases sharply with the increase of load.The wear volume of each ceramic increases with the increase of velocity and load,among which the wear volume of Al2O3/ZrO2 ceramic friction pair is the smallest,and its wear mechanism is mainly abrasive wear and micro fatigue wear.Research shows that under different working conditions,Al2O3 and ZrO2 ceramic pairs have the lowest friction coefficient and wear volume,which are more suitable as friction pair materials for high water-based emulsion hydraulic valves.