纳米Al_(2)O_(3)水雾射流下陶瓷和钛合金的摩擦磨损研究

Study on Friction and Wear of Ceramics and Titanium Alloy under Nano-Al_(2)O_(3) Water Mist Jet

纳米流体因润滑减摩性能优异而得到广泛应用,但纳米粒子水雾射流下摩擦副的摩擦磨损研究较少。本文开展纳米粒子水雾射流润滑下陶瓷和钛合金的摩擦磨损研究,分别制备0.10%,0.25%,0.50%,0.75%四种不同浓度的纳米Al_(2)O_(3)水溶液,进行两种线速度下纳米粒子水雾射流摩擦磨损对比实验,测试比较摩擦系数、磨损面积和磨痕形貌,并探讨摩擦磨损机理。实验结果表明,0.50%纳米Al_(2)O_(3)水雾射流表现出最优的减摩润滑性能。相比于干摩擦,0.50%纳米Al_(2)O_(3)水雾射流在两种不同线速度(10m/min和45m/min)下的摩擦系数分别降低了87.68%和82.81%。在纳米粒子水雾射流下,氧化锆陶瓷与钛合金的主要磨损形式为磨粒磨损,纳米Al_(2)O_(3)发挥的类轴承和保护膜作用是降低摩擦磨损的主要原因。过量的纳米粒子易发生积聚,增大磨粒磨损及微剥落。

Nanofluids have been widely used in lubrication and friction reduction due to their excellent performance.However,there is relatively little research on the frictional study of nanoscale particle water mist jets.In this study,the friction and wear of ceramics and titanium alloys under the lubrication of nanoscale particle water mist jets are investigated.Four different concentrations(0.10%,0.25%,0.50%,and 0.75%)of nanoscale Al_(2)O_(3) aqueous solution are prepared.A comparative experiment on the friction and wear of nanoscale particle water mist jets is conducted at two different linear speeds.The friction coefficient,wear area,and wear morphology are tested and compared.Furthermore,the mechanism of friction and wear is discussed.The experimental results showed that the 0.50%nanoscale Al_(2)O_(3) water mist jet exhibited the best friction reduction and lubrication performance.Compared to dry friction,the friction coefficient under the 0.50%nanoscale Al_(2)O_(3) water mist jet decreased by 87.68%and 82.81%at two different linear speeds(10m/min and 45m/min),respectively.Under the nanoscale particle water mist jet,the wear forms of zirconia ceramics and titanium alloys are mainly abrasive wear caused by abrasive particles.The bearing-like and protective film effects of nanoscale Al_(2)O_(3) are the main reasons for reducing friction and wear.Excessive nanoscale particles were prone to aggregation,leading to increased abrasive wear and micro-flaking.