Effect of superalloy substrate and bond coating on TBC lifetime

被引：44
|
作者：
Pint, B. A. [1 ]
Haynes, J. A. [1 ]
Zhang, Y. [2 ]
机构：
[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[2] Tennessee Technol Univ, Cookeville, TN 38505 USA
来源：
SURFACE & COATINGS TECHNOLOGY | 2010年 / 205卷 / 05期
关键词：
TBC lifetime; Pt diffusion coating; Pt aluminide coating; Scale adhesion; Oxidation; THERMAL BARRIER COATINGS; SINGLE-CRYSTAL SUPERALLOYS; GAMMA' NIPTAL COATINGS; NI-BASED SUPERALLOYS; OXIDATION BEHAVIOR; ALUMINIDE COATINGS; WATER-VAPOR; PLATINUM; SYSTEMS; PERFORMANCE;
D O I：
10.1016/j.surfcoat.2010.08.154
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Several different single-crystal superalloys were coated with different bond coatings to study the effect of composition on the cyclic oxidation lifetime of an yttria-stabilized zirconia (YSZ) top coating deposited by electron beam physical vapor deposition from a commercial source. Three different superalloys were coated with a 7 mu m Pt layer that was diffused into the surface prior to YSZ deposition. One of the superalloys, N5, was coated with a low activity, Pt-modified aluminide coating and Pt-diffusion coatings with 3 and 7 mu m of Pt. Three coatings of each type were furnace cycled to failure in 1 h cycles at 1150 degrees C to assess average coating lifetime. The 7 mu m Pt diffusion coating on N5 had an average YSZ coating lifetime >50% higher than a Pt-modified aluminide coating on N5. Without a YSZ coating, the Pt-modified aluminide coating on N5 showed the typical surface deformation during cycling, however, the deformation was greatly reduced when constrained by the YSZ coating. The 3 mu m Pt diffusion coating had a similar average lifetime as the Pt-modified aluminide coating but a much wider scatter. The Pt diffusion bond coating on superalloy X4 containing Ti exhibited the shortest YSZ coating lifetime, this alloy-coating combination also showed the worst alumina scale adhesion without a YSZ coating. The third generation superalloy N6 exhibited the longest coating lifetime with a 7 mu m Pt diffusion coating. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1236 / 1240
页数：5
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