Isothermal oxidation tests at 1150 °C show that the commercial grade of the single-crystal Ni-based superalloy CMSX-4 is superior to that of the CMSX-10 version. Superalloy CMSX-4 is observed to undergo a shorter stage of transient oxidation and to be able to form more protective oxides during the earlier stages of the reaction as compared to superalloy CMSX-10. This behavior is correlated with the difference in chemical composition between the two superalloys. A significant improvement in oxidation resistance of both superalloys is realized after diffusing a 10 μm thick layer of Pt into their surfaces to produce a Pt-rich surface layer of γ′-phase. However, the oxidation resistance of the composite Pt/CMSX-10 system becomes superior to that of the Pt/CMSX-4 system. Most evidence indicates that this is a reflection of the higher microstructural stability of the γ′-phase in superalloy CMSX-10 and the added beneficial effect provided by Pt.

中文翻译：

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具有和不具有 Pt 改性表面层的选定单晶镍基高温合金的等温抗氧化性比较

1150℃等温氧化试验表明，单晶镍基高温合金CMSX-4的商业等级优于CMSX-10版本。据观察，与超级合金 CMSX-10 相比，超级合金 CMSX-4 经历了更短的瞬态氧化阶段，并且能够在反应的早期阶段形成更多的保护性氧化物。这种行为与两种高温合金之间化学成分的差异有关。在将 10 μm 厚的 Pt 层扩散到它们的表面以产生 γ' 相的富含 Pt 的表面层后，两种高温合金的抗氧化性都得到了显着改善。然而，复合 Pt/CMSX-10 体系的抗氧化性变得优于 Pt/CMSX-4 体系。