Oxidation behavior of a Re-base diffusion-barrier/β-NiAl coating on Nb-5Mo-15W at high temperatures

被引：46
作者：
Matsumura, Y
Fukumoto, M
Hayashi, S
Kasama, A
Iwanaga, I
Tanaka, R
Narita, T
机构：
[1] Hokkaido Univ, Grad Sch Engn, Res Grp Interface Control Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[2] Japan Ultrahigh Temp Mat Res Inst, Ube, Yamaguchi 5070801, Japan
来源：
OXIDATION OF METALS | 2004年 / 61卷 / 1-2期
关键词：
niobium alloy (based on Nb-5Mo-15W); coatings; diffusion-barrier coating; high-temperature oxidation;
D O I：
10.1023/B:OXID.0000016279.88052.d9
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A beta-NiAl coating with or without a Re-base alloy layer was formed on a Nb-5Mo-15W alloy. The coated alloys were oxidized isothermally in air at 1373 and 1473 K. Electroplating of a high ( more than 70 at .%)- Re-Ni film, Cr-pack cementation, Ni plating, and then Al-pack cementation, in this sequence, formed a coating structure with Re-base alloy and beta-NiAl layers. The Re-base alloy layers were comprised of an outer sigma-phase in the Re-Cr(Ni) system and an inner chi-phase in the Re-Nb(Cr) system. It was found that reaction between the beta-NiAl and the alloy substrate was significantly suppressed when the Re-base alloy layers were present. The Re-base sigma and chi phases were found to be good candidates for a diffusion barrier against inward-Al diffusion because they have very low solubilities for Al.
引用
收藏
页码：105 / 124
页数：20
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