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Cyclic oxidation behaviour of plasma sprayed metallic coatings

机译:等离子喷涂金属涂层的循环氧化行为

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High temperature Co- and Ni-based metallic coatings of various compositions were applied on SS-310 samples using plasma spray technique. The coated samples were exposed to air under cyclic conditions at 900 degrees C for upto 100 h. Adhesion of coatings was measured using standard ASTMC 633-79 method. Scanning electron microscopy coupled with energy dispersive X-ray spectroscopy was used to determine the surface morphology and microchemical constitution of coatings. X-ray diffraction was used to identify different phases formed during oxidation. Experimental results indicated that high temperature oxidation of SS-310 alloy was greatly reduced by all coatings. The plasma sprayed metallic coatings on SS-310 alloy performed better than that of bare SS-310 under the selected test conditions. Moreover, when compared among the selected metallic coatings used in the study, the Co-based coatings with higher Cr concentration exhibited superior performance compared to Ni-based coating with lower Cr concentration during the reported cyclic exposure.
机译:使用等离子喷涂技术在SS-310样品上涂覆各种成分的高温Co和Ni基金属涂层。将涂覆的样品在循环条件下于900摄氏度的空气中暴露100小时。使用标准ASTMC 633-79方法测量涂层的附着力。扫描电子显微镜结合能量色散X射线光谱法用于确定涂层的表面形态和微观化学组成。 X射线衍射用于鉴定氧化过程中形成的不同相。实验结果表明,所有涂层均可大大降低SS-310合金的高温氧化。在选定的测试条件下,SS-310合金上的等离子喷涂金属涂层的性能优于裸SS-310。此外,当在研究中使用的选定金属涂层之间进行比较时,在报告的循环暴露过程中,具有较高Cr浓度的Co基涂层与具有较低Cr浓度的Ni基涂层相比,表现出优异的性能。

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