等离子体喷涂Sn和ZrO2涂层／U-Nb合金摩擦副的摩擦性能

Friction Characteristics of Plasma-Sprayed Sn and ZrO2 Coatings against U-Nb Alloy

摘要:

探讨了用等离子体喷涂方法制备改善与U-Nb合金之间摩擦性能的减摩层的可行性。比较了U-Nb合金在涂层表面滑动时Sn软涂层，Sn／ZrO2双涂层，ZrO2硬涂层和ZrO2中加入Sn的混合涂层的摩擦特性。结果表明，表层为Sn的单涂层和Sn／ZrO2双涂层的摩擦性能相近，Sn单涂层的摩擦系数最低。ZrO2硬涂层一直保持着较高的摩擦系数，在ZrO2中加入Sn后，涂层的摩擦系数没有得到有效改善。用等离子体喷涂方法制备的ZrO2硬涂层不适合作U-Nb合金的减摩层。切削是Sn、Sn／ZrO2、Sn ZrO2、ZrO2的涂层与U-Nb合金之间主要的摩擦机理。

Abstract:

The feasibility of reduced-friction coating against U-Nb alloy made by plasma spray technique was investigated. Sn soft coating, Sn/ ZrO2 dual coating, Sn and ZrO2 mixing coating and ZrO2 hard coating were prepared by plasma spray technique. The sliding friction behavior of these coatings against U-Nb alloy was evaluated. The friction characteristic of Sn coating is similar to Sn/ ZrO2 dual coating and its friction coefficient is the lowest among the four coatings. Friction coefficient of ZrO2 coating, into which Sn was added, is decreased little, while friction coefficient of ZrO2 hard coating is stabilized at high value with the increase of sliding number of cycles. ZrO2 coating by plasma spray technique plays no role in reducing friction against U-Nb alloy. Plough is the main friction mechanism of these coatings.