Abstract:This paper takes turbine guide blade as the research object, aluminizing coating were prepared by CVD. By means of SEM, EDS to analysis of the thickness and chemical composition, the effect on size, flow rate and mechanical properties were also analyzed. High-temperature oxidation behaviors were investigated after oxidation at 1000 ℃ for 100 h. The results showed that the coating was external diffusion type. The coatings in the flow channel surface, inner cavity and air film porous layer area were completely uniform, which can protect the base material. The size effect of aluminized coating has little effect on the blade, and the thermal process of CVD has no obvious effect on the mechanical properties of the blade material. The aluminizing coating exhibited good oxidation resistance. The oxidation kinetics curves of the aluminizing coating was in accordance with parabolic rule after oxidation at 1000 ℃ for 100 h.