干摩擦下铸钢表面Ni/Al_2O_3渗层摩擦磨损性能研究

Study on Friction and Wear Properties of Ni/Al_2O_3 Infiltrated Layer on Cast Steel Under Dry Sliding Condition

以铸渗工艺制备出的Ni/Al2O3复合功能渗层作为研究对象,采用MM-200摩擦磨损试验机,摩擦副采用GCr15钢环,在干摩擦条件下考察其摩擦磨损性能;使用扫描电子显微镜观察磨痕形貌。结果表明:Ni/Al2O3复合功能渗层的耐磨性能随氧化铝的加入量增加而增加,载荷和滑动线速度对复合渗层的摩擦磨损性能影响也很大,随载荷与滑动线速度的增加,其磨损率持续增加,而摩擦系数则随载荷增加逐渐降低。Ni/Al2O3复合渗层的磨损机理主要为疲劳磨损、脆性断裂和磨粒磨损。

Ni/Al2O3 composite infiltrated layer was fabricated with cast infiltrate process.The friction and wear experiment was tested on MM-200 tribometer under dry sliding condition.GCr15 steel loop was used as counterpart.Friction and wear properties were measured and the worn surface of the composite layer was observed by SEM.The results show that the anti-wear property of Ni/Al2O3 composite infiltrated layer has relation with the addition of Al2O3 content under room temperature and none-lubrication.The wear rate increases with the increase of load and slid speed,but the friction coefficient decreases with the increase of load.The wear mechanism of Ni/Al2O3-based composite infiltrated layer are fatigue wear,brittle fracture and abrasive wear.