High Temperature Oxidation Behavior of Co-Cr-Y2O3 Modified Aluminide Coatings on Ni-based Superalloy by Pack Cementation Process

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-12-01 DOI:10.1016/S1875-5372(19)30007-4
Cao Jiangdong , Gong Shaojun , Zhong Chonggui , Yao Yanbin
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引用次数: 3

Abstract

The microstructure and high temperature oxidation behavior of Co-Cr-Y2O3 modified pack aluminide coatings on Ni-based superalloy GH586 were investigated. The results show that the specific Co-Cr-Y2O3 modified aluminide coating has a mass gain of only 0.36 mg/cm2 after oxidation at 1000 °C for 100 h, which is much less than that of the substrate at 1000 °C. From X-ray diffraction, the phase of the coatings is mainly AlNi, and after oxidation at 1000 °C for 100 h the denser oxidation scale is composed of Al2O3, Cr2O3, and CoCr2O4. Surface and cross sectional morphologies were characterized by scanning electron microscope (SEM). The coating exhibits a better resistance to high temperature oxidation, compared to the oxidation film of GH586 without coating. Moreover, the growing Cr (W) rich phase is gradually gathered at the grain boundaries during the oxidation, and it is beneficial to providing more Cr element for the dense oxidation film, which is mainly attributed to the excellent high temperature oxidation resistance.

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Co-Cr-Y2O3改性铝化物涂层在ni基高温合金上的高温氧化行为
研究了ni基高温合金GH586表面Co-Cr-Y2O3改性包铝化物涂层的显微组织和高温氧化行为。结果表明,在1000℃氧化100 h后,Co-Cr-Y2O3改性铝化物涂层的质量增益仅为0.36 mg/cm2,远低于基体在1000℃氧化后的质量增益。x射线衍射结果表明,涂层的相主要为AlNi,在1000℃氧化100 h后,较致密的氧化层由Al2O3、Cr2O3和CoCr2O4组成。采用扫描电镜(SEM)对其表面形貌和横截面形貌进行了表征。与未涂覆的GH586氧化膜相比,涂层具有更好的耐高温氧化性能。在氧化过程中,生长的富Cr (W)相在晶界处逐渐聚集,有利于为致密氧化膜提供更多的Cr元素,这主要归功于优异的耐高温氧化性。
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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
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High Temperature Oxidation Behavior of Co-Cr-Y2O3 Modified Aluminide Coatings on Ni-based Superalloy by Pack Cementation Process First-principles Study on Effect of Pressure and Temperature on Mechanical, Thermodynamic Properties, and Electronic Structure of Ni3Al Alloy Numerical Simulation of the Influence of Electrode Shrinkage Cavity on ESR Process of IN718 Alloy Friction and Wear Performance of in-Situ (TiC+TiB)/Ti6Al4V Composites Effect of Benzotriazole on Corrosion Resistance of Al2O3/Cerium Oxide Composite Films on the Al Surface
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