摘要
采用电弧离子镀方法在镍基高温合金DZ125上沉积NiCrAlYSi涂层,通过对不同氧化时间后Al和Cr原子浓度分布曲线的分析,运用Boltzmann-matano方法,计算了Al和Cr元素在1373K分别加热0.5,2h和5h的互扩散系数,并拟合了这三个时间段的计算结果。结果表明:相同温度下,Al和Cr的互扩散系数分别随Al和Cr的原子浓度增加而增大。随氧化时间的延长,Al的互扩散系数随原子浓度的变化先增大然后基本不变,Cr的互扩散系数则逐渐减小;伴随着元素间互扩散行为的增强,涂层中的Al和Cr向基体扩散,基体合金元素Ni,Co,Mo,Ti和W则向涂层扩散,但涂层中Mo和Ti的含量相对较少。由于元素间互扩散行为,涂层中各元素的含量将趋向于更加均匀。
The NiCrAlYSi coating was deposited on Ni-based superalloy DZ125 by Arc-Ion Plating （AIP）. The concentration profiles of Al and Cr in the samples with different oxidation time were analyzed. The interdiffusion coefficients of Al and Cr were calculated by using Boltzmann（Matano method and the fitted curves at 1373K for the oxidation time of 0. 5, 2h and 5h. The results indicate that the interdiffusion coefficients of Al and Cr increase with the atomic contents of Al and Cr under the same temperature. Along with the increment of the oxidation time, the interdiffusion coefficient of Al increases first with the variety of atomic content and then basically keeps constant, while the interdiffusion coefficient of Cr gradually decreases. The elemental interdiffusion between the coating and the substrate occurs as Al and Cr diffuse inward from the coating to the substrate and Ni, Co, Mo, Ti and W diffuse outward from the substrate to the coating, but the contents of Mo and Ti in the coating are comparatively less. According to the elements interdiffusion behavior, the coating composition would tend to become more uniformly distributed.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第2期67-73,共7页
Journal of Materials Engineering
