新一代高温耐磨材料的设计与开发

A New Generation of High Temperature Wear-Resistant Material

针对中国大推比飞机发动机叶冠表面强化用高温耐磨材料的迫切需求,设计热硬度高和抗氧化性优异的碳化铬作为硬质增强相,以高温强度高、抗氧化性和高温耐磨性优良的Ni3Al合金为基体,通过碳化铬和Ni3Al的复合实现优势互补,获得了一种新型的高温耐磨Ni3Al基复合材料MX25C。与现役高温耐磨材料T800合金相比,MX25C材料的服役温度更高、综合性能更优异,其850℃时的高温耐微动磨损性能和1000℃时的高温抗氧化性分别是T800合金的6.4倍和5.3倍,有望成为新一代高温耐磨材料。

According to the high temperature wear-resistant requirement of the components such as new generation of areo-engine blade, a new high temperature wear-resistant chromium carbide /Ni3 Al composite named as MX25 C was designed based on good high temperature wear resistance, mechanical properties and oxidation resistance of Ni3 Al intermetallics and high hot hardness, good oxidation resistance of chromium carbide. Compared with T800 alloy, the best conventional high-temperature wear-resistant material, MX25 C composite possessed higher wear resistance and oxidation resistance. The fretting wear resistance at 850℃ of MX25 C composite was 6.4 times of that of T800 alloy. The oxidation rate of T800 alloy was 5.3 times of that of MX25 C composite after 1000℃/100 h oxidation in air. All of these showed that MX25 C composite was able to become an attractive potential candidate for high-temperature wear-resistant material.