Abstract
The paper studies a heat-resistant two-layer coating based on the Y-Al-O and Ti-Al-C systems, obtained by vacuum- arc deposition on a heat-resistant nickel alloy Inconel 738 by depositing first a Ti-Al-C layer, then a Y-Al-O layer. After vacuum heat treatment, carried out in order to crystallize the coating, the samples were tested for heat resistance in an oven at a temperature of 1000 °C, structural-phase transformations in the coating after the test were studied using scanning electron microscopy and X-ray diffraction. After testing, the oxide layer of the coating collapsed, and the diffusion layers underneath prevented further oxidation.
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