Abstract：CoCrAlYTa coatings were prepared by means of detonation gun spraying.The influence of oxygen/fuel in-gun ratio on the structure and oxidation resistance of the as-prepared coatings was investigated by SEM, EDS, XRD and high-temperature oxidation test. The results revealed that the detonation temperature and bombardment velocity increased with the increased of oxygen/fuel in-gun ratio, which induced the transformation of coating structure from uniform structure to lamellar structure and the decreased of the coating porosity. Meanwhile, the continuous oxide scale was prone to being formed earlier if the coating was more compactness, which decreased the parabolic rate constant kP of the coating. The critical concentration of Al element in the coating to form Al2O3 declined consequently and the selective oxidation of Al was promoted. The formed Al2O3 layer can further suppress the diffusion of oxygen into the coating and result in the enhancement of oxidation resistance with the increase of oxygen/fuel in-gun ratio.
高俊国, 陆峰, 王长亮, 郭孟秋, 崔永静. 氧燃充枪比对爆炸喷涂CoCrAlYTa涂层抗氧化性能的影响[J]. 材料工程, 2013, 0(4): 28-33.
GAO Jun-guo, LU Feng, WANG Chang-liang, GUO Meng-qiu, CUI Yong-jing. Influence of Oxygen/Fuel In-gun Ratio on Oxidation Resistance of CoCrAlYTa Coating Prepared by Detonation Gun Spraying. Journal of Materials Engineering, 2013, 0(4): 28-33.
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