High temperature corrosion behavior of a multilayer CrAlN coating prepared by magnetron sputtering method on a K38G alloy |
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Authors: | Tianpeng Li Yanchun Zhou Meishuan Li |
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Affiliation: | a High-performance Ceramic Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China b Graduate School of Chinese Academy of Sciences, Beijing, 100039, China c National Key Laboratory of Advanced Functional Composite Materials, Beijing, 100076, China |
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Abstract: | A multilayer CrAlN coating of Cr0.58Al0.42N/Cr0.84Al0.16N/Cr0.51Al0.49N has been fabricated by a reactive magnetron sputtering method. It consists of a bonding layer, a Cr-rich intermediate layer and an Al-rich outer layer. The multilayer structure provides the coating with good protection against different types of high temperature corrosion, i.e., high temperature oxidation and hot corrosion. The outer Al-rich layer gives the coating good oxidation resistance at 1000 and 1100 °C due to the formation of a continuous alumina scale. The parabolic rate constants of the coated samples decrease by about 2 orders of magnitude compared with that of the bare alloy samples. The intermediate Cr-rich layer can form a Cr2O3 scale to provide good protection under the hot corrosion conditions in the Na2SO4 salt fluxing at 900, 950 and 1000 °C. The incubation period of the hot corrosion extends several times longer when the alloy was coated by the multilayer coating at the three selected temperatures. |
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Keywords: | Multilayer coating Oxidation Hot corrosion Magnetron sputtering |
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