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The oxide content in Al powders has been found to have a significant effect on the expansion and stability of foams made via a PM route. With low oxide contents (O<0.3 wt%) expansion is moderate and the foam structure is unstable. Larger expansions, improved foam stability and more homogeneous foam structures are achieved if the amount of oxide in the powder is moderate (O=0.3–0.6 wt%). Foaming...
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