Effect of Pre-Heat-Treatment on the Oxidation Resistance of MCrAlY Coatings: A Review

Abstract

High-performance gas turbines and aircraft engines necessitate MCrAlY (M = Ni, Co, or Ni/Co) coatings with exceptional oxidation resistance. Pre-heat-treatment can enhance the performance of MCrAlY bond coatings in the following ways: First, it reduces the porosity of the bond coating and promotes the diffusion of elements within it. Second, pre-heat-treatment allows for the formation of a continuous, dense, and moderately thick layer of pure Al2O3 scale, which helps to delay the formation of mixed oxides. Lastly, proper pre-heat-treatment can increase the grain size of the Al2O3 scale, leading to a lower growth rate of the oxide scale. Additionally, this article proposes new directions for developing more reasonable and effective pre-heat-treatment methods, laying the foundation for the creation of thermal barrier coatings (TBCs) with greater durability and higher performance.

The Impact of Various Superalloys on the Oxidation Performance of Nanocrystalline Coatings at High Temperatures

“…The constant demand for improving engine efficiency has led to high temperature protective coatings becoming a hot research topic [1][2][3][4][5][6]. As the most widely used traditional high-temperature protective coatings, aluminide and MCrAlY coatings exhibit excellent oxidation resistance.…”