Formation of a protective alumina scale on Ni-base superalloys by using the halogen effect

被引：1

作者：

Zschau, Hans-Eberhard ^{[1
]}

Renusch, Daniel ^{[2
]}

Masset, Patrick J. ^{[3
]}

Schuetze, Michael ^{[1
]}

机构：

[1] DECHEMA EV, Karl Winnacker Inst, Theodor Heuss Allee 25, D-60486 Frankfurt, Germany

[2] Alstom, CH-5401 Baden, Switzerland

[3] Tech Univ Bergakad Freiberg, Inst Energieverfahrenstechn & Chemieingenieurwese, D-09596 Freiberg, Germany

来源：

EURO SUPERALLOYS 2010 | 2011年 / 278卷

关键词：

Ni-base superalloys; oxidation protection; halogen effect; ion implantation; alumina scale; ALLOYS;

D O I：

10.4028/www.scientific.net/AMR.278.485

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A new method is proposed to achieve a dense protective alumina scale for Ni-base superalloys with an Al-content lower than 10 wt.% at temperatures above 1000 degrees C. The method is based on the halogen effect. Thermodynamical calculations show the existence of a region for a positive fluorine effect at temperatures between 900-1200 degrees C for the alloys IN738 and IN939. By using fluorine ion implantation in combination with Monte Carlo simulation of the fluorine profiles these results were transformed into a region of F-concentrations at the metal surface. A dense protective alumina scale was formed for IN738 after oxidation at 1050 degrees C. Due to the very low Alcontent no alumina scale was found for IN939.

引用

页码：485 / +

页数：2

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