微织构光固化填充h-BN的巴氏合金表面摩擦学性能

为了提高巴氏合金在油润滑条件下的摩擦学性能，在巴氏合金表面加工凹坑微织构并利用光固化填充方法填充六方氮化硼(h-BN)固体润滑剂，制备出h-BN与表面微织构相结合的复合润滑结构。研究复合润滑结构在油润滑条件下的摩擦学性能及其减摩润滑机制。结果表明：复合润滑结构的摩擦学性能远高于未织构面和纯织构面；当凹坑微织构直径较小时，织构密度为10%～20%时，复合润滑结构摩擦因数较小，而凹坑直径较大时，随着织构密度的增加，复合润滑结构摩擦因数逐渐减小；当织构密度小于20%时，凹坑直径较小的复合润滑结构摩擦因数小，当织构密度达到30%时，随着凹坑直径的增加，复合润滑结构摩擦因数减小。复合润滑结构能够改善巴氏合金表面摩擦学性能，是因为h-BN固体润滑剂的释放在巴氏合金表面形成了固体润滑薄膜，避免了润滑油膜较薄处的巴氏合金表面直接与45钢表面接触，且释放h-BN固体润滑剂后的微织构凹坑可以起到收集磨粒，储存润滑油的作用。

Tribological Properties of Micro-texture Babbitt Alloy Surface with Light Curing h-BN

In order to improve the tribological properties of Babbitt alloy under oil lubrication condition,a composite lubrication structure composed of hexagonal boron nitride(h-BN) solid lubricant and surface micro-texture was prepared by filling h-BN solid lubricant into the micro-textured dimples on the surface of Babbitt alloy by light curing method.The tribological properties of the composite lubrication structure and the mechanism of antifriction and lubrication under the condition of oil lubrication were studied.The results show that the tribological properties of the composite lubrication structure are much higher than that of the untextured and pure textured surfaces.When the dimple diameter is small and the micro-texture is between 10% to 20%,the friction coefficient of the composite lubrication structure is low.When the dimple diameter is large,the friction coefficient of the composite lubrication structure decreases gradually with the increase of dimple density.When the dimple density is less than 20%,the friction coefficient of the composite lubrication structure with smaller dimple diameter is low.As the dimple density reaches 30%,the friction coefficient of the composite lubrication structure decreases with the increase of dimple diameter.The composite lubrication structure can greatly improve the tribological properties of Babbitt alloy surface because the release of h-BN solid lubricant forms a solid lubricant film on the surface of Babbitt alloy,which avoids the direct contact between the Babbitt alloy surface at the thinner part of the lubricating oil film and the surface of 45 steel,and the micro-textured dimples after the release of h-BN play the role of collecting abrasive particles and storing lubricating oil.