Abstract
Pt-diffused coatings were synthesized on Ni10Al alloy by electroplating a thin layer of Pt (1–5 μm) followed by a diffusion treatment in vacuum at 1000–1100 °C. Effects of processing parameters (Pt thickness and vacuum diffusion temperature) on the microstructures and chemical composition of Pt-diffused coatings were investigated. Also, the oxidation behavior of the coatings was studied at 1100 °C. Pt film reveals nano-sized grain size of 93–113 nm. Vacuum diffusion treatment leads to the grain growth. 1-μm Pt film with 1000 °C/1 h vacuum diffusion fabricates nano-sized Pt-diffused coating which exhibits the best oxidation resistance. And a single continuous Al2O3 scale forms on the coating with low Al (~ 9 at%) and Pt (~ 6 at%) contents. Increasing initial Pt thickness would introduce more defects and cracks, leading to a duplex scale and decreasing the oxidation resistance of Pt-diffused coatings.
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