Al掺杂CoCrNiAlY金属黏结层的高温抗氧化行为研究

High temperature oxidation behaviors of Al doped CoCrNiAlY metal bonding layers

采用电弧离子镀技术在GH4169高温合金表面制备CoCrNiAlY和Al掺杂CoCrNiAlY涂层,系统开展涂层的高温抗氧化行为与机理研究,利用XRD、SEM和EDS等微尺度分析表征方法,全面解析涂层的物相结构特征、氧化反应产物及表/截面微观形貌。研究结果表明,未掺杂CoCrNiAlY涂层表现较差的结构稳定性和抗氧化性能,涂层呈持续氧化增重趋势,200 h涂层质量增重达0.38 mg/cm^(2)。然而,Al掺杂显著提升CoCrNiAlY涂层的高温抗氧化性能与结构稳定性,质量增重率先迅速增大后趋于稳定,200 h涂层的质量增重约0.30 mg/cm^(2)。本研究结果充分证实Al元素掺杂可显著改善CoCrNiAlY金属黏结层抗氧化性能。

CoCrNiAlY and Al-doped CoCrNiAlY coatings were prepared on the surface of GH4169 high-tem-perature alloy by arc ion plating technology,and the high-temperature antioxidant behaviour and mechanism of the coatings were systematically investigated,and the physical structure characteristics,oxidation reaction products,and the surface/sectional microscopic morphology were comprehensively analyzed by using mi-croscale analytical characterization methods such as XRD,SEM and EDS.The results show that the undoped CoCrNiAlY coatings exhibit poor structural stability and antioxidant properties,and the coatings show a con-tinuous oxidation weight gain trend,with the mass gain of the coatings reaching 0.38 mg/cm^(2) at 200 h.How-ever,Al doping significantly improves the high temperature antioxidant properties and structural stability of the CoCrNiAlY coatings,and the mass gain increases rapidly and then tends to be stabilised,with the mass gain of the coatings reaching approximately 0.5 mg/cm^(2) at 200 h.The mass gain of the coating is about 0.30 mg/cm^(2).The results of this study fully confirm that Al doping can significantly improve the antioxidant property of CoCrNiAlY metal bonded layer.