不同环境气氛中NiAl-2.5Ta-7.5Cr-1B-5Co-2.5Re合金的摩擦磨损特性

Friction and Wear Characteristics of NiAl-2.5Ta-7.5Cr-1B-5Co-2.5Re Alloy in Different Ambient Atmospheres

本工作研究了空气、真空以及氮气环境中NiAl-2. 5Ta-7. 5Cr-1B-5Co-2. 5Re合金的磨损特性。采用XRD、SEM、EDS分析了合金的相组成与磨损机制。结果表明:真空与氮气中,合金磨损表面没有形成氮化物以及化学吸附层,合金与对磨件直接接触磨损;空气的氧化作用导致部分合金磨损表面生成了氧化膜,产生一定程度的氧化磨损。不同环境气氛中,合金的磨损率主要受控于磨损表面接触状态和磨损机制;当载荷为3～5 N时,磨损表面呈弹性接触状态,磨损率主要受控于粘着磨损机制;当载荷为10～20 N时磨损表面呈塑性接触状态,磨损率主要受控于磨粒磨损机制。真空与氮气中,合金的摩擦系数主要受控于摩擦力的剪切作用;空气中,磨损表面的氧化膜对摩擦系数产生重要影响。

The wear characteristics of NiAl-2.5Ta-7.5Cr-1B-5Co-2.5Re alloy in different ambient atmospheres were studied.The phase composition and wear mechanism of the alloy were analyzed by XRD,SEM and EDS.The results showed that the wear surface of the alloy does not form nitride and its chemical adsorption layer in the vacuum and nitrogen,the alloy is in direct against Si3N4,The oxidation of the air causes the surface of the alloy with oxide film.In different ambient atmosphere,the wear rate of the alloy are mainly controlled by the contact state and wear mechanism,the friction surface is in elastic contact state at 3~5 N,and the wear rate is mainly influenced by the adhesive wear mechanism.10~20 N,the friction surface is in plastic contact state,and its wear rates are mainly controlled by the abrasive wear.In the vacuum and nitrogen,the friction coefficients are mainly controlled by the shear force of the friction.In the air environment,the oxide film on the wear surface have a great influence on friction coefficients.