Abstract
The thermal oxidation properties of Al-ion-implanted, Ni-based alloys used for thermocouples of Inconel 600, alumel, chromel and constantan have been studied in humid O 2 atmospheres at 970 K for 50 h. The Al ion implantation was performed with doses ranging from 1 × 10 16 to 2 × 10 17 ion cm -2 at an energy of 50 keV. The depth profiles measured by Auger electron spectroscopy showed that the concentrations of Al and O were higher near the surface of the alloys after implantation. The implanted alumel and constantan exhibited no effect on the suppression of oxidation. However, implantation above a dose of 1 × 10 17 Al ion cm -2 significantly slowed the oxidation of the Inconel 600 and chromel alloys containing Cr. The thermoelectric properties of the actual thermocouples modified by Al ion implantation are discussed.
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