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.
作者
张瑞
任昐
阳颖飞
杨胶溪
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)
出处
《激光与光电子学进展》
CSCD
北大核心
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)。
