In situ (Al,Cr)2O3-Cr composite coating fabricated by reactive plasma spraying |
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| Affiliation: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;3. A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk 90, Russia;2. Novosibirsk State University, Pirogova, 2. 630090 Novosibirsk. Russia;3. Helmholtz Center Potsdam GFZ, 4.3, Telegrafenberg, 144482 Potsdam, Germany |
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| Abstract: | In situ (Al,Cr)2O3-Cr composite coating was fabricated by reactive plasma spraying Al-Cr2O3 composite powder. Phase composition and microstructure of the as-sprayed coating was characterized by X-ray diffractometer, scanning electron microscope and transmission electron microscope. Indentation fracture behavior of the coating was investigated. It is found that the microstructure of the coating consists of (Al,Cr)2O3+Cr] eutectic and Cr+(Al,Cr)2O3+Cr] hypoeutectic. The eutectic microstructure of the coating shows the characteristic of nano structure, in which Cr particles with size less than 40 nm distribute in (Al,Cr)2O3 solid solution matrix. The hypoeutectic microstructure of the coating consists of Cr particles with size larger than 1 µm and (Al,Cr)2O3+Cr] divorced eutectic. The toughness of the (Al,Cr)2O3-Cr composite coating is significantly improved compared with that of the conventional Al2O3 coating. |
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| Keywords: | A Solid state reaction B Nanocomposites B Microstructure-final Thermit reaction Nanostructured coating |
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