中文摘要：

采用粉末冶金工艺制备一种Ni-Co-Al系高温合金，研究了该合金的室温力学性能和高温（800℃）摩擦学性能与热压温度的关系。结果表明：合金的密度、硬度、抗压强度随着热压温度的提高而提高，但是热压温度高于1200℃后提高不大；随着热压温度的提高合金的高温摩擦学性能有所改善，磨痕表面形成了保护性的氧化物“釉质层”，“釉质层”与基体的结合强度影响了合金的高温摩擦性能，而结合强度又可能与热压烧结试样的致密度有关。磨痕表面犁沟的深浅与热压温度有很大关系。

英文摘要：

A Ni-Co-Al superalloy was prepared by powder metallurgy（mechanical alloying ＋ hot- press sintering）. Then the effect of hot-press sintering temperature on the mechanical property of the alloy at ambient temperatures and the tribological performance at 800℃ were investigated. Results show that the density, hardness and compressive strength of the alloy increase with the increase of sintering temperature, while these properties change little when the sintering temperature above 1200℃. As the sintering temperature increases, the tribological performance of the alloy at 800℃ gets better. The examination of the worn surface morphology by SEM and XPS found that a glaze-like oxide scale formed on the worn surface, which seemed to be beneficial to the tribological performance. The adhesive strength between the oxide scale and the substrate affects the tribological performance of the alloy, which may relate to higher density induced by higher sintering temperature. The examination of the worn surface with 3D non-contact surface mapping profiler exhibits that the depth of abrasion grooves is dependent on the hot-pressing temperature.