A study of the diffusion and pre-oxidation treatment on the formation of Al 2 O 3 ceramic scale on NiCrAlY bond-coat during initial oxidation process
Source abstract
Abstract
Abstract In this study, the formation of thermally growth ceramic oxides during initial oxidation on treated NiCrAlY bond-coat was investigated. The oxidation resistance of NiCrAlY bond-coat was enhanced by two approaches: (i) an inter-diffusion treatment in a tube furnace with flowing argon at 600 °C for 1 h, and (ii) a pre-oxidation treatment in static air at atmospheric pressure at 1000 °C for 1 h. Experimental results showed that, after diffusion treatment, the content of Al in the bond-coat increased. This led to the growth of θ-Al 2 O 3 during the pre-oxidation process, which was then helped in the formation of a dense and continuous α-Al 2 O 3 /Cr 2 O 3 multilayer on the surface of the bond-coat. Results on the cyclic oxidation at 1200 °C (for time≤204 h) showed that the treated NiCrAlY bond-coat exhibited better oxidation resistance than the NiCrAlY bond-coat samples without diffusion treatment and the samples pre-oxidized at 800 °C for 1 h. The formation of NiO, Cr 2 O 3 and NiCr 2 O 4 spinel oxides were suppressed due to the formation of α-Al 2 O 3 scale during the initial oxidation on the surface of pre-treated NiCrAlY bond-coat.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advanced ceramic materials synthesis · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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