The service of protective coatings at high temperature will lead to interdiffusion between the coating and superalloy. The occurrence of interdiffusion not only reduces the oxidation resistance of the coating but also reduces the mechanical properties of superalloys, especially single crystal superalloys. At present, the main methods of suppressing interdiffusion are: adding a diffusion barrier layer between the coating and superalloy, a so-called “equilibrium” (EQ) coating, and a nanocrystalline coating. In the current review, the advantages and disadvantages of these three methods for suppressing interdiffusion are discussed, and an attempt is made to determine the best method for suppressing interdiffusion to improve the service life of high-temperature components.

保护涂层在高温下使用会导致涂层与高温合金之间的相互扩散。相互扩散的发生不仅降低涂层的抗氧化性能，而且降低高温合金特别是单晶高温合金的力学性能。目前抑制相互扩散的主要方法有：在涂层与高温合金之间添加扩散阻挡层、所谓的“平衡”（EQ）涂层、纳米晶涂层等。本综述讨论了这三种抑制相互扩散方法的优缺点，并试图确定抑制相互扩散的最佳方法，以提高高温部件的使用寿命。