Synthèse et caractérisations structurale, physicochimique et de résistance à l'oxydation à chaud de revêtements de nitrures de chrome enrichis en silicium obtenus par un procédé hybride arc-magnétron en condition réactive

Abstract : IIn this study, Cr-Si-N coatings are synthesized by an arc-magnetron hybrid process. In spite of a lower hardness of Cr-Si-N coatings in comparison with Ti-Si-N ones synthesised in a preliminary study performed to validate the deposition device, Cr-Si-N coatings present a higher resistance to high temperature oxidation. The Cr2N-based coatings are softer than those based on CrN. Si addition yields an increase of the lattice constant attributed to the substitution of N by Si. In CrN-based coatings, the maximum hardness of about 50-60 GPa is obtained for 6-8 at. % Si. For Cr2N-based coatings, the hardness decreases linearly with the Si content. Si addition improves both hardness stability and oxidation resistance at high temperature for both coatings. Grains growth, CrN destabilisation into Cr2N and interdiffusion of Fe and Si are the main parameters which govern the loss of hardness after annealing at high temperature of the coatings
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Vishnu Rachpech. Synthèse et caractérisations structurale, physicochimique et de résistance à l'oxydation à chaud de revêtements de nitrures de chrome enrichis en silicium obtenus par un procédé hybride arc-magnétron en condition réactive. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL052N⟩. ⟨tel-01752897⟩

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