Comparison of thermal expansion and oxidation behavior of various high-temperature coating materials and superalloys

被引:125
作者
Haynes, JA [1 ]
Pint, BA [1 ]
Porter, WD [1 ]
Wright, IG [1 ]
机构
[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA
关键词
thermal expansion; oxidation; coatings; superalloys;
D O I
10.3184/096034004782749944
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The thermal expansion mismatch between a metallic substrate and its external oxide scale generates a strain on cooling that is a primary cause of spallation of protective oxide scales. This study compares thermal expansion behavior and cyclic oxidation performance of the two major composition classes of high-temperature commercial coatings for protection of single-crystal superalloys. The thermal expansion of cast MCrAlY (M = Ni and/or Co) alloys and cast aluminides (NiAl, (Ni,Pt)Al and Ni3Al) was measured at temperatures up to 1300degreesC and compared to that of a single-crystal Ni-base superalloy. The tendency for scale spallation from each alloy was evaluated by cyclic oxidation testing at 1150degreesC. The coefficients of thermal expansion for the aluminides were lower than those of the MCrAlY-based alloys at all temperatures and scale adherence to the Hf-doped aluminides was generally superior. Scale adherence to the various compositions of MCrAlY-type alloys did not directly correlate to their thermal expansion behavior or substrate strength. For both types of materials, the presence of a reactive element (Y,Hf, etc.) had no detectable effect on thermal expansion but a major effect on scale adherence. There was no obvious influence of At content on the thermal expansion of beta phase Ni-Al compositions. The addition of Pt resulted in a lower average thermal expansion for hyperstoichiometric (Ni,Pt)AI at temperatures above 930degreesC, but this effect was not observed in hypostoichiometric (Ni,Pt)AI.
引用
收藏
页码:87 / 94
页数:8
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