激光与光电子学进展, 2020, 57 (17): 171408, 网络出版: 2020-09-01
激光熔覆Al2O3/CoNiCrAlY涂层的高温氧化特性 下载: 1113次
High-Temperature Oxidation Characteristics of Al2O3/CoNiCrAlY Coating Obtained via Laser Cladding
激光光学 激光熔覆 CoNiCrAlY 高温氧化 α-Al2O3; 能量密度 laser optics laser cladding CoNiCrAlY high-temperature oxidation α-Al2O3; energy density
摘要
为了提高Al2O3/CoNiCrAlY涂层的抗高温氧化能力,采用激光熔覆的方法在K438合金的表面制备Al2O3/CoNiCrAlY涂层,并研究不同的能量密度对其微观结构及材料的高温氧化行为的影响。实验结果表明:在由α-Co、γ-Ni/Cr、Al2O3、Ni3Al以及Ni2Cr3组成的Al2O3/CoNiCrAlY涂层中,Al2O3的加入可以有效细化涂层的显微结构,且涂层经过1100 ℃高温氧化后晶界处形成AlN,涂层表面形成的氧化膜分为内层α-Al2O3氧化物和外层Cr2O3与(Co,Ni)(Al,Cr)2O4的混合氧化物。不同的能量密度下,涂层的高温氧化动力学曲线均符合抛物线规律,当能量密度为64.97 J/mm 3时,涂层的抗高温氧化性能最好。
Abstract
To improve the high-temperature oxidation characteristics of the Al2O3/CoNiCrAlY coatings, they are prepared on the surface of the K438 alloy via laser cladding. In addition, the effects of different energy densities on the microstructure and high-temperature oxidation behavior of materials are studied. The experimental results indicate that the Al2O3/CoNiCrAlY coatings comprise α-Co, γ-Ni/Cr, Al2O3, Ni3Al, and Ni2Cr3. The coating will exhibit an appropriate microstructure after the addition of Al2O3. Further, the coating is oxidized at 1100 ℃ to obtain AlN at the grain boundary. The oxide films form on the coating surface comprise an inner layer of α-Al2O3 oxide and an outer layer of Cr2O3 and (Co,Ni)(Al,Cr)2O4 mixed oxide. All the kinetic curves of the high-temperature oxidation of the coating under different energy densities conform to the parabolic law. The coating exhibits optimal high-temperature oxidation resistance when the energy density is 64.97 J/mm 3.
张瑞, 任昐, 阳颖飞, 杨胶溪, 周圣丰. 激光熔覆Al2O3/CoNiCrAlY涂层的高温氧化特性[J]. 激光与光电子学进展, 2020, 57(17): 171408. Rui Zhang, Pan Ren, Yingfei Yang, Jiaoxi Yang, Shengfeng Zhou. High-Temperature Oxidation Characteristics of Al2O3/CoNiCrAlY Coating Obtained via Laser Cladding[J]. Laser & Optoelectronics Progress, 2020, 57(17): 171408.