采用滑动磨损实验测试了NiAl--28Cr--5.6Mo--0.25Ho--0.15Hf(原子分数, %)共晶合金与SiC陶瓷配副在600---1000 ℃下的摩擦磨损特性. 结果表明, 在700---900 ℃下合金表现出优异的自润滑耐磨性能, 这种特性源于共晶合金摩擦表面生成了1---3 μm厚的玻璃陶瓷润滑膜, 该润滑膜可向SiC表面转移, 形成玻璃陶瓷/玻璃陶瓷的摩擦状态. 随着温度的升高, 共晶合金与润滑膜的强度降低, SiC微粒压入润滑膜, 导致润滑膜的剥落加剧、共晶合金磨损率升高. 共晶合金在600 ℃下由于未形成润滑膜而发生较严重的磨粒磨损, 摩擦系数和磨损率很高.
The wear behaviors of NiAl--28Cr--5.6Mo--0.25Ho--0.15Hf eutectic alloy against SiC ceramic under dry sliding from 600 to 1000 ℃ were investigated on a pin--on--disc test rig. The results show that the eutectic alloy exhibits excellent self--lubricating properties in the temperature range of 700---900 ℃, which is attributed to the formation of 1---3 μm thick glass--ceramic lubricant film. During wear testing the lubricant film was partially transferred to the SiC counterface, which avoided the direct tribo--contact between the alloy and SiC ceramic. At temperatures above 900 ℃ or below 700 ℃ the friction coefficient and wear rate are higher, owing to the adhesion between matrix and film weakening or no film forming.
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