Research Status and Prospect of High Entropy Alloy Coating Prepared by Electrospark Deposition
TIAN Haoliang1, ZHANG Xiaomin2, JIN Guo2, PIAO Zhongyu3, WANG Changliang1, GUO Mengqiu1, DU Xiuxin1, WANG Tianying1, ZHANG Ang1, XIAO Chenbing1
1 Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 Institute of Surface Science and Technology, Harbin Engineering University, Harbin 150001, China 3 School of Mechanical Engineering, Zhejiang University of technology, Hangzhou 310014, China
Abstract: The multi-principal component alloy based on high entropy effect overcomes the disadvantages of traditional high entropy alloy and forms a simple solid solution with excellent comprehensive properties. At first, the design concept of high entropy alloy is mainly realized through the block high entropy alloy. With the in-depth research of high entropy alloy, the concept of high performance high entropy alloy coating is put forward. However, the existing techniques of magnetron sputtering, thermal spraying and laser cladding to prepare high entropy alloy coatings have many problems, such as low thickness, high porosity and poor accessibility to special-shaped key parts, which seriously hinder the application of high entropy alloy coatings in aerospace field. EDM deposition technology not only has the advantages of green, energy saving and material sa-ving, but also has the advantages of uniform thickness and good accessibility for the key parts of the structure characteristics such as the inner wall of long and thin pipe and curved cambered surface. In addition to the exploration of coating preparation process, many scholars also through the high entropy alloy coating design one of the five effects of the “cocktail effect” to change the composition of mixing, and the addition of WC and other hard particles and rare earth elements to achieve the required structure and properties of the coating. Finally, researchers often optimize the process parameters of high entropy alloy coating preparation by means of orthogonal test before coating preparation, so as to improve the performance required by the coating. In this paper, the design principle of high entropy alloy and the research progress of preparing high entropy alloy coatings by different technologies are introduced in detail, the relationship between the structure and properties of different high entropy alloy coa-tings is summarized, and the development prospect of electrospark deposition of high entropy alloy coatings as surface modification means is pointed out.