Abstract
A nanocrystalline NiCrAlYHfSi coating was prepared by magnetron sputtering. The coating after post-annealing comprised matrix γ′-Ni3Al and α-Cr precipitates. No coating spallation was observed after 100 cycles of 1000–25°C water-quenching test. A continuous Cr23C6 interlayer between the coating and the substrate was spontaneously formed during high temperature exposure, and exhibited good performance in suppressing the coating/substrate interdiffusion. The α-Cr precipitates in the coating disappeared gradually as Cr in the coating was consumed to form the Cr23C6 interlayer. Its growth rates can be fitted into a law controlled by two completing processes: a parabolic growth and a linear decomposition.
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