A promising new bond coat using CuAlNiCrFe high-entropy alloy was proposed in this paper. The difference in pre-oxidation conditions between the traditional thermal-sprayed MCrAlY bond coat and CuAlNiCrFe high-entropy alloy bond coat deposited using high-speed laser cladding was investigated. The result confirmed that the CuAlNiCrFe high-entropy alloy bond coat deposited using high-speed laser cladding can complete the pre-oxidation faster and form a continuous α-Al₂O₃ thermally grown oxide (TGO), which shortens the initial oxidation stage, thereby avoiding the formation of other oxides and spinel structures. In the subsequent isothermal oxidation process, the block-like structure of the high-speed laser cladding layer and the sluggish diffusion effect of the high-entropy alloy work together to ensure the slow and continuous supply of aluminum element to TGO layer and obtain a low growth rate. Also, the diffusion between the bonding layer and the substrate is controlled at a low level, and the new CuAlNiCrFe bond coat exhibits excellent oxidation and diffusion resistance. With the consumption of aluminum, the phase structure of the high-entropy alloy bond coat changed from BCC to FCC, but it still maintained a stable simple solid solution structure.

本文提出了一种有希望的新型CuAlNiCrFe高熵合金涂层。研究了传统的热喷涂MCrAlY键合涂层与使用高速激光熔覆沉积的CuAlNiCrFe高熵合金键合涂层在预氧化条件上的差异。结果证实，CuAlNiCrFe高熵合金粘结涂层使用高速激光熔覆可以完成预氧化更快，形成连续沉积的α-Al ₂ ö ₃热生长氧化物（TGO），可缩短初始氧化阶段，从而避免形成其他氧化物和尖晶石结构。在随后的等温氧化过程中，高速激光熔覆层的块状结构和高熵合金的缓慢扩散作用共同作用，以确保缓慢且连续地向TGO层供应铝元素并获得较低的增长率。而且，将粘结层和基底之间的扩散控制在较低水平，并且新的CuAlNiCrFe粘结涂层表现出优异的抗氧化性和抗扩散性。随着铝的消耗，高熵合金粘结涂层的相结构从BCC变为FCC，但仍保持稳定的简单固溶体结构。