Magnetron Sputtering Preparation Of MAX Phase Coating And Its Antigen Oxygen Performance

The preparation of a suitable coating is the key to improving the oxygen erosion performance of the spacecraft material antigens.Due to theirs unique layered structure,MAX phase materials have very good mechanical properties,oxidation resistance and high damage tolerance,and have great potential in the field of space protective coatings.MAX phase are alternative material for spacecraft material protective coatings.On the one hand,we must continue to explore the preparation methods of new MAX phase coating materials.On the other hand,we need to conduct space environment simulation experiments on existing MAX phase materials and evaluate theirs protective effect on spacecraft in the space environment.This article focuses on these two aspects,using magnetron sputtering to successfully prepare V₂Sn C,Nb₂Al C,Zr-Al-C,（Ti Cr VNb Ta）₂Al C coatings and（Ti Cr VNb Ta）₂Al C and（Ti VCr）₂Al C coatings with preferred orientation.The focus is on the composition,macroscopic morphology and phase composition of the prepared coating.The results showed that all the coatings prepared had MAX phase formation,and the MAX phase crystal grains randomly nucleated at the interface,and then competitively grew to form the preferred orientation of the coating.On the other hand,this article focuses on the mechanical properties of the MAX phase coating and the oxygen erosion performance of the antigen.The nano-hardness of the prepared coating is in the range of 12-20 GPa,and the Young’s modulus is in the range of 280-330 GPa.Compared with the bulk materials reported in the literature and prepared in the laboratory,the prepared MAX phase coating has higher nano-hardness and Young’s modulus.In addition,this article studies the antiprotonic oxygen erosion performance of Zr-Al-C coatings.The adhesion force between the Zr-Al-C coating and the substrate is estimated to be 18 N through the scratch test.After 30 hot and cold shock tests,the Zr-Al-C coating is intact,and there is no cracking or peeling.The oxidation rate of ZIRLO/Zr-Al-C in an atomic oxygen environment within 30 h is lower than that of Zr alloy.Under a certain amount of atomic oxygen,Zr-Al-C coating can protect Zr alloy.The atomic oxygen exposure time is further increased,and Zr O,Zr O₂,and Al₂O₃ are formed on the Zr-Al-C coating.At the same time,the carbon element on the surface of the Zr-Al-C coating is oxidized to form volatile oxides,such as CO and CO₂,forming more pores so that atomic oxygen can further penetrate into the interior of the Zr-Al-C coating,continuing the erosion of atomic oxygen effect.Considering the protective effect of the Zr-Al-C coating on the Zr alloy under a certain atomic oxygen exposure dose,the protection time can be calculated according to the linear law of the obtained Zr-Al-C coating thickness,and the experiment can be designed.In summary,these results have certain reference significance for the application of MAX phase in the spacecraft environment.