激光熔覆Al2O3/CoNiCrAlY涂层的高温氧化特性  

High-Temperature Oxidation Characteristics of Al2O3/CoNiCrAlY Coating Obtained via Laser Cladding

作　　者：张瑞 任昐 阳颖飞 杨胶溪[3] 周圣丰 Zhang Rui;Ren Pan;Yang Yingfei;Yang Jiaoxi;Zhou Shengfeng(School of Physical science and Technology,Tianjin Polytechnic University,Tianjin 300387,China;Institute of Advanced Wear&Corrosion Resistance and Functional Materials,Jinan University,Guangzhou,Guangdong 510632,China;Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]天津工业大学物理科学与技术学院,天津300387 [2]暨南大学先进耐磨蚀及功能材料研究院,广东广州510632 [3]北京工业大学激光工程研究院,北京100124

出　　处：《激光与光电子学进展》2020年第17期227-236,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51261027);江西省杰出青年基金(20162BCB23039);天津市自然科学基金京津冀专项(17JCZDJC40500)。

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。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 compriseα-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 ofα-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.

关 键 词：激光光学 激光熔覆 CONICRALY 高温氧化 Α-AL2O3 能量密度 

分 类 号：TG174[金属学及工艺—金属表面处理]