Ta12W合金表面离子束沉积薄膜与U-Nb合金之间的摩擦性能

采用离子束沉积方法在Ta12W合金表面制备了Sn,In软金属薄膜,Al2O3陶瓷薄膜和In/Al2O3复合薄膜.利用销盘摩擦磨损试验机并结合SEM观察分析了对偶销为U-Nb合金时,试样的摩擦学性能并讨论了摩擦磨损机理.当用SiC对偶进行评价时,Sn,In软金属薄膜降低了Ta12W合金摩擦系数.然而当对偶销改为工程状态的U-Nb合金时,由于用离子束溅射沉积法制备的Sn薄膜太薄、In薄膜与U-Nb合金发生粘着,Sn,In软金属薄膜与In/Al2O3复合薄膜均未降低Ta12W合金的的摩擦系数.当Sn薄膜增加到一定厚度时,摩擦性能得到明显改善.Al2O3陶瓷薄膜与U-Nb合金对偶销摩擦时,与Ta12W合金表面直接摩擦结果一样,由于U-Nb合金容易被磨损而使磨屑转移到试样表面,摩擦系数没有下降.

Friction Characteristics between U-Nb Alloy and Film by Ion Beam Deposition on Ta12W Alloy Surface

Sn and In soft metal films, Al2O3 ceramic film and In/Al2O3 dual film were prepared with ion beam deposition technique. Sliding friction characteristics of these films against U-Nb alloy pin were evaluated by a pin-disc tribometer and Scan Electrical Microscopy (SEM). It had been found that the friction coefficients of sliding against SiC ceramics ball with smoothing surface decreased for the Sn and In films due to their very low strength, but increased against U-Nb alloy pin with engineering-coarse surface for the In film and In/Al2O3 dual film due to the adhesion between In and U-Nb alloy. Meantime, very thin Sn film resulted in increase of friction coefficient. The friction property would be improved only when the thickness of Sn film increased to a reasonable value. Otherwise, the friction coefficient of Al2O3 ceramics film against the U-Nb alloy with low strength did not decrease almost same as the results of Ta12W alloy because the U-Nb alloy was easy to be worn and transferred on the surface.