Study on the Oxidation Resistance of GH 783 Alloy and NiCoCrAlYTa Coating
CHEN Xiaoping1,2, TAO Xiancheng3, BAO Ting1,2, ZHAO Ningning1,2, LOU Yumin1,2, YUE Jianling3,*
1 Zhejiang Energy Technology Research Institute Co., Ltd., Hangzhou 311121, China 2 Key Laboratory of Energy Conservation & Pollutant Control Technology for Thermal Power of Zhejiang Province, Hangzhou 311121, China 3 Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
Abstract: This work innovatively utilized multi arc ion plating technology to prepare NiCoCrAlYTa coatings on GH 783 alloy. The microstructure of the coatings was characterized by SEM, XRD, and EDX detection methods, and the effect of NiCoCrAlYTa coatings on the high-temperature oxidation behavior of GH 783 alloy was studied. The results show that the prepared NiCoCrAlYTa coating has a dense structure and a thickness of about 30 μm, the main reinforcing phase is Ni3Al, and the coating structure is rich in Al on the outer layer and Cr on the inner layer. The enrichment of trace element Y in the coating on the surface is beneficial for improving the adhesion of the oxide film, while the enrichment of Ta at the interface between the coating and the substrate is beneficial for enhancing the adhesion of the coating. After adding NiCoCrAlYTa coating, the weight gain trend of GH 783 sample during oxidation at 1 000 ℃ can be slowed down, and the oxidation rate is relatively stable. It can effectively reduce the amount of oxide skin detachment, and improve the overall antioxidant performance of the material from secondary to antioxidant le-vels. The reason why NiCoCrAlYTa coating has excellent high-temperature oxidation resistance is that during the preparation process of NiCoCr-AlYTa coating, Al2O3 thin films are generated on the coating surface, which can maintain the presence of the reinforcing phase Ni3Al in the NiCoCrAlYTa coating.
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2025, Vol. 39 
