Microstructural Evolution of SAPS/HVOF CoNiCrAlY Alloy Coating During Thermal Cycling Test

作者：Tang, J. J.; Bai, Y.^*; Liu, K.; Zhang, P.; Li, B. Q.; Yang, J. F.

来源：Oxidation of Metals, 2016, 86(1-2): 75-87.

DOI：10.1007/s11085-016-9621-4

• Alloy coating
• Unmelted particles
• Thermal cycling
• Microstructural evolution
• TGO growth

In this paper, CoNiCrAlY alloy coatings were deposited by high-efficiency supersonic atmospheric plasma spraying (SAPS) and high-velocity oxygen fuel (HVOF) spraying. The microstructural evolution of coatings during thermal cycling test was investigated. The results suggested that the as-sprayed SAPS coating consisted of lamellar structures and unmelted particles. However, the as-sprayed HVOF coating primarily consisted of the unmelted particles. The beta-NiAl phase mainly existed in the unmelted particles, and its content increased with the increase of unmelted particles. The thermal cycling life of SAPS coating was 258 cycles, about 117 % higher than that of HVOF coating. During thermal cycling, significant internal oxidation and large cracks formed in the HVOF coating, which was one of the reasons that led to the spallation of HVOF coating.

• 出版日期2016-8
• 单位西安交通大学