WC-Ni/SiC摩擦副滑动摩擦性能

Sliding friction properties of WC-Ni/SiC friction couple

以WC-(5,7,9)Ni硬质合金与SiC陶瓷材料为摩擦副,在MMU-10型屏显式材料端面摩擦磨损试验机上,研究该摩擦副材料在干摩擦条件下,不同压强、不同滑动速度时的摩擦磨损行为,利用扫描电子显微镜观察磨损后的表面形貌。结果表明:当压强一定时,随着滑动速度的增加,WC-Ni/SiC摩擦副的摩擦因数逐渐下降,并趋于平稳;当滑动速度一定时,随着试验压强p的增加,摩擦因数逐渐减小;摩擦因数还随合金中Ni含量的增加而增大;硬质合金的磨损量随材料的硬度降低而增大;当滑动速度0.95m/s时,摩擦副材料的磨损机制与合金成分和试验压强p有关,当p=0.15MPa时,WC-5Ni/SiC为粘着磨损,WC-7Ni/SiC和WC-9Ni/SiC表现为粘着和磨粒磨损综合作用机制;当p=0.60MPa时,3种摩擦副的磨损机制主要是磨粒磨损。

The friction and wear behaviors of WC-（5, 7, 9）Ni/SiC friction couples were tested by a MMU-10 frictional tester at different applied pressures and speeds under dry sliding condition, and the morphologies of worn surface were observed by scanning electron microscopy （SEM）. The results show that the friction coefficients of these friction couples decrease as the sliding speed increases when pressures are unaltered, and reach stable value eventually. With the increase of test pressure when speed is unaltered, the friction coefficients decrease gradually. The friction coefficients also increase with the increases of nickel content of these hard-materials. The wear loss increases as the hardness decreases. The wear mechanism is connected with the alloying component and test pressure when sliding speed is 0.95 m/s, the WC-5Ni/SiC couple is adhesive wear mechanism when p is 0.15 MPa, WC-7Ni/SiC and WC-9Ni/SiC couples are adhesion and abrasive wear mechanism; but whenp is 0.60 MPa, there was abrasive wear mechanism for these WC-Ni/SiC couples.