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Comparison of microstructure and oxidation behavior of CoNiCrAlY coatings produced by APS, SSAPS, D-gun, HVOF and CGDS techniques
Vacuum ( IF 4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.vacuum.2020.109609
Abdullah Cahit Karaoglanli , Yasin Ozgurluk , Kadir Mert Doleker

Abstract MCrAlY coatings are widely preferred in materials used at high temperature applications exposed to oxidation and hot corrosion. The coating process used in the production of thermal spray coatings directly affects the microstructure and lifetime of the coating. In this study, a CoNiCrAlY metallic bond coat was deposited on Inconel 718 superalloy substrate material using APS, SSAPS, D-gun, HVOF and CGDS spraying techniques. The produced coatings were subjected to isothermal oxidation tests at 1000 °C for different exposure times. Porosity, surface roughness, XRD, SEM, EDX-elemental mapping analysis were used to investigate and determine the microstructures and the changes in the dimensions of thermally grown oxide (TGO) layer as a function of time and temperature. The obtained data were compared before and after the oxidation tests, and the findings were evaluated considering other related studies within the literature. The results show that CGDS CoNiCrAlY coatings exhibited better oxidation resistance than the coatings produced by the other techniques.

中文翻译:

APS、SSAPS、D-gun、HVOF和CGDS技术生产的CoNiCrAlY涂层的微观结构和氧化行为比较

摘要 MCrAlY 涂层广泛用于暴露于氧化和热腐蚀的高温应用中使用的材料。热喷涂涂层生产中使用的涂层工艺直接影响涂层的微观结构和寿命。在这项研究中,使用 APS、SSAPS、D 枪、HVOF 和 CGDS 喷涂技术在 Inconel 718 高温合金基材上沉积 CoNiCrAlY 金属粘合涂层。制备的涂层在 1000 °C 下进行了不同暴露时间的等温氧化试验。孔隙率、表面粗糙度、XRD、SEM、EDX 元素映射分析用于研究和确定热生长氧化物 (TGO) 层的微观结构和尺寸随时间和温度的变化。将所得数据对比氧化试验前后,并考虑了文献中的其他相关研究对结果进行了评估。结果表明,CGDS CoNiCrAlY 涂层表现出比其他技术生产的涂层更好的抗氧化性。
更新日期:2020-10-01
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