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曹将栋.包埋法Co-Cr-Y改性高温合金GH586渗铝涂层高温氧化行为[J].稀有金属材料与工程(英文),2018,47(12):3616~3623.[Cao Jiangdong.High temperature oxidation behavior of Co-Cr-Y-modified Aluminide Coatings on Ni-based superalloy by pack cementation process[J].Rare Metal Materials and Engineering,2018,47(12):3616~3623.]
High temperature oxidation behavior of Co-Cr-Y-modified Aluminide Coatings on Ni-based superalloy by pack cementation process
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Received:March 31, 2018  Revised:May 19, 2018
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Key words: Superalloy  Oxidation behavior  Surface modification  Coating.
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Cao Jiangdong  
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Abstract:
      In this work the microstructures and high temperature oxidation behaviors of Co-Cr-Y modified pack aluminide coatings on Ni-based superalloy GH586 were investigated. The results indicated that the specific Co-Cr-Y-modified aluminide coating had a mass gain of only 0.36 mg/cm2 after oxidation at 1000 °C for 100 h, it was much less than that of the substrate at 1000 °C. From the X ray diffraction the phases of the coatings were mainly AlNi, and after oxidation for 100h at 1000 °C the denser oxidation scale was composed of Al2O3, Cr2O3, and CoCr2O4. The surface and cross sectional morphologies were characterized by scanning electron microscope (SEM). The coating exhibited the better high temperature oxidation resistance, compared to the oxidation film of GH586 without coating. Moreover, the growing Cr (w) rich phase was gradually gathered in the grain boundaries during the oxidation, it is beneficial to provide more Cr element for the dense oxidation film, which is mainly attributed to the excellent high temperature oxidation resistance.