Corrosion-wear mitigation: are metallic glass coating deposited by cold spray good candidates?

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FY2019 was dedicated to elaborate stainless steel metal glass powders. In order to use them for Cold spray, a large quantity (at about 3 kg) was made at the lab scale. The glassy state of ores was confirmed by X-ray diffraction. Atomisation of ores was contracted out a company. Size distribution at about 20-30 micronmeter was requested and confirmed by laser scattering granulometry. X-ray diffraction patterns were recorded to check the glassy state. SEM observations shown a mix of spherical and elongated particles suitable of cold spray.FY2020. High pressure cold spray deposition were performed. Agglomeration of particles was solved by a dispersant addition. However high deposition rate was no achieved because of maximum temperature allowed by cold spray setup.Therefore, Metallic glass samples were produced by Spark Plasma Sintering. The results show that the heating rate has a direct effect on the crystallinity but reduces the densification. A first paper in writting deals with this point and the corrosion resistance of these materials.Ceramic particles were also added to SPS samples. Higher density were achieved because the voids between metal glass particules was also filled by the ceramic. Wear tests were carried out and a second paper is under consideration.