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所属单位：材料科学与技术学院

发表刊物：APPLIED SURFACE SCIENCE

关键字：NiCoCrAlY coatings Double-glow plasma alloying Oxidation behavior

摘要：The NiCoCrAlY coatings were deposited on the Inconel 718 alloy substrates by a novel method called double-glow plasma alloying (DG). The phases and microstructure of the coatings were investigated by X-ray diffraction analysis while their chemical composition was analyzed using scanning electron microscopy. The morphology of the NiCoCrAlY coatings was typical of coatings formed by DG, with their structure consisting of uniform submicron-sized grains. Further, the coatings showed high adhesion strength (critical load >46 N). In addition, the oxidation characteristics of the coatings and the substrate were examined at three different temperatures (850, 950, and 1050 degrees C) using a muffle furnace. The coatings showed a lower oxidation rate, which was approximately one-tenth of that of the substrate. Even after oxidation for 100 h, the Al2O3 phase was the primary phase in the surface coating (850 degrees C), with the thickness of the oxide film increasing to 0.65 mu m at 950 degrees C. When the temperature was increased beyond 1050 degrees C, the elemental Al and Ni were consumed in the formation of the oxide scale, which underwent spallation at several locations. The oxidation products of Cr, which were produced in large amounts and had a prism-like structure, controlled the subsequent oxidation behavior at the surface. (C) 2017 Elsevier B.V. All rights reserved.

ISSN号：0169-4332

是否译文：否

发表时间：2018-01-15

合写作者：Cui, Shiyu,Miao, Qiang,Li, Baiqiang

通讯作者：Cui, Shiyu,梁文萍