Abstract
Co-deposition of aluminide coatings on the inner and outer surfaces of turbine blades using chemical vapor deposition (CVD) technology is a major challenge in the field of advanced materials engineering. To overcome this challenge, a sub-aluminum generator device was designed and Co-Al coatings with typical β-NiAl microstructure were successfully obtained on the inner and outer surfaces of the turbine blades in the present study. In addition, the effects of different heat treatment processes on the microstructures of the Co-Al coatings were also investigated, and the results show that the addition of heat treatment process can easily lead to the thinning of Co-Al coating thickness, the increase of oxidation degree as well as the emergence of different types of topological close packing (TCP) phases. The serious loss of Al would also lead to the occurrence of transition from β-NiAl phase to γʹ-Ni3Al phase. This study not only breaks through the limitations of conventional CVD equipment, but also provides valuable insights into the microstructural evolution of Co-Al coatings under different heat treatment conditions, and provides necessary conditions for further exploration of co-deposition technology for different types of coatings.
Published Version
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