The halogen effect for Ni-base alloys – A new method for increasing the oxidation protection at high temperatures

✍ Scribed by Hans-Eberhard Zschau; Daniel Renusch; Patrick J. Masset; Michael Schütze

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 698 KB
• Volume: 267
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2009.01.098

✦ Synopsis

A new method for oxidation protection of Ni-base alloys is presented. The method is based on the halogen effect. Thermodynamic calculations show the preferred formation of gaseous Al-halogenides within a certain region of fluorine partial pressures. Ion implantation has been chosen for fluorine treatment. The implantation parameters are defined by using the T-DYN simulation software. Based on these results fluorine implantations of the Ni-base alloy IN 738 are performed to meet the required fluorine content near the surface. The fluorine depth profiles are analyzed by using the PIGE-technique. After oxidation at 1050 °C a dense protecting external alumina scale is formed on the surface.