Effects of Some Light Alloying Elements on the Oxidation Behavior of Fe and Ni-Cr Based Alloys During Air Plasma Spraying |
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Authors: | Zhensu Zeng Seiji Kuroda Jin Kawakita Masayuki Komatsu Hidenori Era |
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Affiliation: | 1. Kurashiki Boring Kiko. Co., Ltd., 329-2 Ebana, Jitoukami, Kamogata-cho, Asakuchi-gun, Okayama, 719-0233, Japan 2. National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan 3. Kyushu Institute of Technology, 1-1-1, Sensui, Kitakyushu, Fukuoka, Japan
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Abstract: | The oxidation behavior of iron binary powders with addition of Si (1, 4 wt.%) and B (1, 3 wt.%) and that of a Ni-Cr based alloy powder with Si (4.3 wt.%), B (3.0 wt.%), and C (0.8 wt.%) additions during atmosphere plasma spray (APS) have been investigated. Analysis of the chemical composition and phases of oxides in the captured in-flight particles and deposited coatings was carried out. The results show that the addition of Si and B to iron effectively reduced the oxygen contents in the coatings, especially during the in-flight period at higher particles temperature. Ni-Cr based alloy powder with Si, B, and C additions reduced the oxidation of the base alloys significantly. Preferential oxidation and subsequent vaporization of Si, B, and C from the surface of the sprayed particles are believed to play a major role in controlling oxidation in the APS process. |
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