The effect of yttrium content on the oxidation-induced degradation of NiCoCrAlY coatings and the influence of surface roughness on the oxidation of NiCoCrAlY and platinum aluminide coatings

被引：3
|
作者：
Yanar, N. M. [1 ]
Meier, E. M. [1 ]
Pettit, F. S. [1 ]
Meier, G. H. [1 ]
机构：
[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
来源：
MATERIALS AT HIGH TEMPERATURES | 2009年 / 26卷 / 03期
关键词：
yttrium; NiCoCrAlY coatings; platinum aluminide coatings; cyclic oxidation; surface roughness; INSTABILITY; BEHAVIOR; FAILURE;
D O I：
10.3184/096034009X472231
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It has been found that the yttrium content of NiCoCrAlY coatings affects the useful lives of such coatings during cyclic oxidation. In particular, NiCoCrAlY coatings with 0.1wt% yttrium have more than twice the lifetime at 1100 degrees C compared to NiCoCrAlY coatings with 0.5wt% yttrium. The mechanism by which the yttrium concentration influences the degradation of NiCoCrAlY coatings will be described. It has also been observed that the adverse effect of yttrium can be inhibited by reducing the roughness of the coating surface. The influence of surface condition on the oxidation of yttrium in NiCoCrAlY coatings will be examined in detail and the effects of surface roughness on the oxidation of NiCoCrAlY and platinum aluminide coatings will be compared. Finally the effects of yttrium in the substrate alloy on the oxidation of platinum aluminide coatings will be discussed.
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页码：331 / 338
页数：8
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