Effect of platinum on the growth rate of the oxide scale formed on cast nickel aluminide intermetallic alloys

被引：64

作者：

Cadoret, Y

Monceau, D ^{[1
]}

Bacos, M

Josso, P

Maurice, V

Marcus, P

机构：

[1] UPS, CNRS,UMR 5085, INPT, ENSIACET,CIRIMAT, F-31077 Toulouse, France

[2] Off Natl Etud & Rech Aerosp, Dept Mat Met & Proc, F-92322 Chatillon, France

[3] Univ Paris 06, Ecole Natl Super Chim Paris, CNRS,UMR 7045, Lab Physicochim Surfaces, F-75231 Paris, France

来源：

OXIDATION OF METALS | 2005年 / 64卷 / 3-4期

关键词：

nickel aluminide; platinum; sulfur effect; high temperature oxidation; transition alumina;

D O I：

10.1007/s11085-005-6558-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Thermo-Gravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) data of the initial stages of oxidation of Ni50Al50 and Ni40Pt10Al50 alloys of low and high sulfur content at 900 degrees C and 1100 degrees C are reported. The results show that the addition of Pt promotes the growth of the transient theta-Al2O3 oxide scale. This effect is particularly sensitive in the initial stages of oxidation at 1100 degrees C where Pt considerably increases the total mass gain. It is attenuated in the presence of a high sulfur content in the alloy, indicating a competitive effect of Pt and S on the segregation of Al. The slower theta-to-alpha transition observed in the presence of Pt leads to an extended lifetime of the theta phase layer, which is proposed to be beneficial to the relaxation of the stresses created by the growth of alpha-Al2O3.

引用

页码：185 / 205

页数：21

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