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Abstract
• Abrasive coating was produced by arc ion plating, electroplating and above-pack aluminisation. • The abrasive coating consisted of a NiCrAlYSi layer, a β-NiAl diffusion layer and cBN particles. • The abrasive coating showed lower oxidation rate and degradation rate at 900 °C. • B 2 O 3 , oxidation product of cBN, could prevent further oxidation of cBN at 900 °C. • The oxidation and corrosion mechanisms of the abrasive coating were investigated. In order to improve the oxidation and hot corrosion resistance of blades tip as well as the sealing performance of gas turbine engine, a NiCrAlYSi + NiAl/cBN abrasive coating was prepared by combining arc ion plating, electroplating and above-pack aluminisation. Oxidation and hot corrosion behavior of the abrasive coating were investigated. Results indicated that the abrasive coating showed lower oxidation and degradation rate at 900 °C. NaCl aggravated the corrosion extent via cyclic chlorination/oxidation reaction, and the cBN/metallic coating interface also played a crucial role as a shortcut of the corrosive media. Besides, the oxidation and hot corrosion mechanisms were discussed.
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