Impact of Si on the high-temperature oxidation of AlCr(Si)N coatings
| Autor: | Martin Rosenthal, Jaakko Julin, Rostislav Daniel, Christian Mitterer, Stefan Spor, Farwah Nahif, Nikolaus Jäger, Michael Meindlhumer, Hynek Hruby, Jozef Keckes, Michal Zítek |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Technology
Thermogravimetric analysis STRESS Materials science Polymers and Plastics Annealing (metallurgy) Materials Science nanomateriaalit Oxide THERMAL-STABILITY Materials Science Multidisciplinary engineering.material oxidation behaviour chemistry.chemical_compound Differential scanning calorimetry Coating Residual stress Materials Chemistry komposiitit pinnoitteet Science & Technology AlCrSiN Nanocomposite nanocomposite Mechanical Engineering hapettuminen Metals and Alloys MECHANICAL-PROPERTIES EVOLUTION cross-sectional X-ray nanodiffraction AL Chemical engineering chemistry Mechanics of Materials Ceramics and Composites engineering Metallurgy & Metallurgical Engineering Atomic ratio ALCRN COATINGS RESISTANCE BEHAVIOR SYSTEM NANOCOMPOSITE COATINGS cathodic arc |
| Zdroj: | 'Journal of Materials Science & Technology ', vol: 100, pages: 91-100 (2022) |
| ISSN: | 1005-0302 |
| Popis: | The resistance of wear protective coatings against oxidation is crucial for their use at high temperatures. Here, three nanocomposite AlCr(Si)N coatings with a fixed Al/Cr atomic ratio of 70/30 and a varying Si-content of 0 at.%, 2.5 at.% and 5 at.% were analyzed by differential scanning calorimetry, thermogravimetric analysis and X-ray in order to understand the oxidation behavior depending on their Si-content. Additionally, a partially oxidized AlCrSiN coating with 5 at.% Si on a sapphire substrate was studied across the coating thickness by depth-resolved cross-sectional X-ray nanodiffraction and scanning trans-mission electron microscopy to investigate the elemental composition, morphology, phases and residual stress evolution of the oxide scale and the non-oxidized coating underneath. The results reveal enhanced oxidation properties of the AlCr(Si)N coatings with increasing Si-content, as demonstrated by a retarded onset of oxidation to higher temperatures from 1100°C for AlCrN to 1260°C for the Si-containing coatings and a simultaneous deceleration of the oxidation process. After annealing of the AlCrSiN sample with 5 at.% Si at an extraordinary high temperature of 1400°C for 60 min in ambient air, three zones developed throughout the coating strongly differing in their composition and structure: (i) a dense oxide layer comprising an Al-rich and a Cr-rich zone formed at the very top, followed by (ii) a fine-grained transition zone with incomplete oxidation and (iii) a non-oxidized zone with a porous structure. The varying elemental composition of these zones is furthermore accompanied by micro-structural variations and a complex residual stress development revealed by cross-sectional X-ray nanodiffraction. The results provide a deeper understanding of the oxidation behavior of AlCr(Si)N coatings depending on their Si-content and the associated elemental, microstructural and residual stress evolution during high-temperature oxidation. peerReviewed |
| Databáze: | OpenAIRE |
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