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面发生较严重的磨粒磨损,摩擦系数和磨损率很高.
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