Multilayer and high-entropy alloy-based protective coatings for solving the issue of critical raw materials in the aerospace industry

Abstract

Aerospace is an actively developing industry that continuously requires the implementation of modern technologies. The rapid growth in new vehicle production demands much support. Hence, the problem of resources with complicated supply and distribution is always of current interest. These critical raw materials (CRMs) are involved in almost all areas of aerospace manufacturing and service. An efficient and profitable solution to the problem of critical materials can be found in protective coatings, especially in such advanced concepts as multilayer and high-entropy alloy (HEA)-based coatings. In this paper, we study both ways of manufacturing effective coatings. We have shown that multilayer CrN/MoN coatings with exceptional toughness and hardness could find promising applications in the aerospace industry. The developed strategy for the novel materials screening based on the prediction of their properties has been demonstrated on the example of the refractory HEA-based coatings. A brief state of the art of the EU critical raw materials and their place in the aerospace/defence industry has been given.

Optimization of cold spray process parameters to maximize adhesion and deposition efficiency of Ni+Al2O3 coatings

“…Ni+Al 2 O 3 powder in accordance with the developed experiment design was deposited on prepared samples made of VT3-1 titanium alloy using a DYMET-405 low-pressure cold spraying machine. Sample of the microstructure of the deposited coating is shown in figure 5, and the results of calculations of adhesion strength and deposition efficiency are shown in table 4.…”

“…Corrosion and wear of working surfaces often lead to the need for a complete replacement of parts. High operating temperatures and operations in aggressive environments significantly reduce the service life of parts, and coating in these cases is a possible protection method [1][2][3][4]. Spraying coatings using thermal spray methods reduces metal losses and replacement costs, and improves the quality, reliability, and durability of parts and machines.…”

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

“…It is very likely, however, that HEAs may contain many critical raw elements. Appropriate screening methods could allow the selection of HEAs with a reduced CRM content [8,62,63] and AM optimized processes may provide further CRMs saving.…”

Atomistic evaluation of tension–compression asymmetry in nanoscale body-centered-cubic AlCrFeCoNi high-entropy alloy

“…[12] Because of their unique performances, HEAs have been widely applied in many advanced technology fields, such as hydrogen storage materials, [13] radiation resistant materials, [14] coating materials, [15] and aerospace industry. [16] Among the numerous outstanding performances of HEAs, their mechanical performance is critically important for the engineer application and has attracted increasing attention in the past decade. A great number of experimental studies have been conducted to investigate the mechanical behavior and deformation mechanism of HEAs.…”