Comparative Structure, Oxidation Resistance and Thermal Stability of CoNiCrAlY Overlay Coatings With and Without Pt and Their Performance in Thermal Barrier Coatings on a Ni-Based Superalloy

被引：0
|
作者：
H. M. Tawancy
机构：
[1] King Fahd University of Petroleum and Minerals,Center for Engineering Research, Research Institute
来源：
Oxidation of Metals | 2018年 / 90卷
关键词：
Oxidation; Superalloys; Bond coatings; Thermal barrier coatings; Electron microscopy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
It is demonstrated that the addition of Pt to CoNiCrAlY overlay coating can significantly improve its oxidation resistance and thermal stability as well as its performance in thermal barrier coatings. The addition of Pt is found to stabilize a surface layer with composition based upon NiAlPt2 with L1o superlattice in addition to enhancing a more favorable distribution of Y and restricting the outward diffusion of detrimental substrate elements particularly Ta and Ti. Due to these beneficial effects, utilizing the Pt-modified bond coating in a TBC system with top coating of zirconia stabilized by yttria is found to extend its lifetime from 410 ± 42 h to 956 ± 48 h as determined from cycling oxidation tests at 1150 °C. However, spallation of the top coatings in the two systems has been correlated with loss of oxide adherence to the bond coatings.
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页码：383 / 399
页数：16
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