Multilayer antioxidant high-temperature-resistant SiC/Ta/C/Ta/SiC coating and preparation method thereof

Abstract

The invention discloses a multilayer antioxidant high-temperature-resistant SiC / Ta / C / Ta / SiC coating and a preparation method thereof. The multilayer antioxidant high-temperature-resistant SiC / Ta / C / Ta / SiC coating is formed by laminating SiC layers, Ta layers and C layers, and is characterized in that the laminating sequence is the SiC layer, the Ta layer, the C layer, the Ta layer and the SiC layer, or SiC layer, the Ta layer, the C layer, the Ta layer, the SiC layer, SiC layer, the Ta layer, the C layer, the Ta layer, and the SiC layer, or SiC layer, the Ta layer, the C layer, the Ta layer, the SiC layer, SiC layer, the Ta layer, the C layer, the Ta layer, the SiC layer, SiC layer, the Ta layer, the C layer, the Ta layer and the SiC layer; both sides of the C layer are Ta layers; the innermost layer and the outermost layer are SiC layers; and the Ta layer, the C layer, the Ta layer and the SiC layer are sequentially deposited on the prepared SiC layer with a chemical vapor deposition method so as to obtain the multilayer antioxidant high-temperature-resistant SiC / Ta / C / Ta / SiC coating. According to the coating and the preparation method thereof, the outer SiC layer forms a layer of SiO2 film in a high-temperature aerobic environment, so that diffusion of oxygen atoms can be prevented effectively, and meanwhile, a TaC layer can be formed on a contact surface of the Ta layer and the C layer to further improve the antioxidation performance. Alternate deposition of coatings can effectively relieve differences of coefficients of thermal expansion of the coatings and improve the thermal shock performance of the coatings remarkably, the thickness and lay number of a matrix can be controlled by controlling deposition time and deposition times, and the microstructure of the composite coating can be controlled.

Description

technical field [0001] The invention relates to an anti-oxidation and high-temperature resistant coating and a preparation method thereof, in particular to a SiC / Ta / C / Ta / SiC multilayer anti-oxidation and high-temperature resistance coating and a preparation method thereof. technical background [0002] Structural materials such as aero-engines, turbine blades, industrial turbines, aerospace engines, and thermal generators operate at high temperatures and are subject to high-temperature oxidation and corrosion. In order to protect these hot-end parts from oxidation corrosion at high temperature and prolong their life, a lot of research has been done on high-temperature structural materials and high-temperature coatings. In recent years, high-temperature structural materials have made great progress, but it is not enough to improve the high-temperature oxidation resistance of materials only from the material itself. Practice has proved that it is very difficult for high-tempe...

AI Technical Summary

Problems solved by technology

However, a serious defect of the anti-oxidation coating provided in the literature is that the thermal expansion coefficient of the coating and the substrate does not match, and the bonding strength of the coating is weak. protection, resulting in a serious decline in the performance of C / SiC composites