Effect of Pt additions on the sulfur segregation, vold formation and oxide scale growth of cast nickel aluminides

被引：30

作者：

Cadoret, Y

Bacos, MP

Josso, P

Maurice, V

Marcus, P

Zanna, S

机构：

[1] Off Natl Etud & Rech Aerosp, Dept Mat Metall & Procedes, F-92322 Chatillon, France

[2] Univ Paris 06, CNRS, UMR 7045, Lab Physico Chim Surfaces,Ecole Natl Super Chim P, F-75231 Paris 05, France

来源：

HIGH TEMPERATURE CORROSION AND PROTECTION OF MATERIALS 6, PRT 1 AND 2, PROCEEDINGS | 2004年 / 461-464卷

关键词：

nickel aluminide; platinum; sulfur segregation; isothermal oxidation; spallation; void formation; oxide growth mechanism; reactive element (RE); theta-alpha phase transformation;

D O I：

10.4028/www.scientific.net/MSF.461-464.247

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The addition of Pt in cast and diffusion nickel aluminide is known to improve the oxide scale adhesion, but the positive effects of this element remain still imprecise. This present study reports experimental results concerning the diminution of sulfur segregation in the presence of platinum (10% at.) in beta-NiAl, at 750degreesC. However, Pt did not completely prevent sulfur from segregating to a free surface. It was also shown that the addition of Pt in the alloy decreased the formation of voids at the oxide/metal interface after isothermal oxidation at 900degreesC. The ratio of the oxide thickness to cavity depth strongly decreases in Pt modified nickel aluminide. Lastly, thermogravimetric investigations revealed that Pt increased the oxide growth rate at 1100degreesC.

引用

页码：247 / 254

页数：8

共 21 条

[1] OXIDATION BEHAVIOR OF NIAL .2. CAVITY FORMATION BENEATH THE OXIDE SCALE ON NIAL OF DIFFERENT STOICHIOMETRIES [J].