Effect of Platinum on the Growth Rate of the Oxide Scale Formed on Cast Nickel Aluminide Intermetallic Alloys |
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| Authors: | Y Cadoret D Monceau M -P Bacos P Josso V Maurice P Marcus |
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| Affiliation: | (1) Département Matériaux Métalliques et Procédés, ONERA, BP 72, 29 avenue de la division Leclerc, 92322 Châtillon Cedex, France;(2) CIRIMAT (UMR5085) CNRS-INPT-UPS, ENSIACET, 31077 Toulouse Cedex 4, France;(3) Laboratoire de Physico-Chimie des Surfaces, CNRS (UMR 7045) – Université Pierre et Marie Curie, Ecole Nationale Supérieure de Chimie de Paris, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France |
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| Abstract: | 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°C and 1100°C are reported. The results show that the addition of Pt promotes the growth of the transient θ-Al2O3 oxide scale. This effect is particularly sensitive in the initial stages of oxidation at 1100°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 θ-to-α transition observed in the presence of Pt leads to an extended lifetime of the θ phase layer, which is proposed to be beneficial to the relaxation of the stresses created by the growth of α-Al2O3. |
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| Keywords: | nickel aluminide platinum sulfur effect high temperature oxidation transition alumina |
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