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Yan, H. Y.
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article
Effect of alloying on the oxidation behaviour of Co-Al-W superalloys
Abstract
<p>The 800°C isothermal and cyclic oxidation of alloys based on Co-7Al-7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (>100μm thick). In these layers, the outer was Co<sub>3</sub>O<sub>4</sub> and the inner, a porous Co<sub>3</sub>O<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub> mixture. 10at.% Cr substitution for Co was sufficient to produce a protective, ~1μm thick scale which contained an outer layer of Al<sub>2</sub>CoO<sub>4</sub>, a very thin (100nm) middle layer of Cr<sub>2</sub>O<sub>3</sub> and an inner layer of Al<sub>2</sub>O<sub>3</sub>. Therefore protective oxide scales are possible in γ/γ<sup>'</sup>, Co-Co<sub>3</sub>(Al,W) superalloys.</p>