The Effect of Compaction Method on the Expansion and Stability of Aluminium Foams
The foam expansion and collapse behaviour for heat treated Al‐TiH2 precursors has been shown to be driven by the oxidation of the Al powder, which can, in moderation, improve the foam expansion and increase foam stability, and the premature loss of gas from the TiH2, which delays but decreases the f...
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Published in | Advanced engineering materials Vol. 8; no. 9; pp. 810 - 815 |
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Main Authors | , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.09.2006
WILEY‐VCH Verlag Wiley-VCH |
Subjects | |
Online Access | Get full text |
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Summary: | The foam expansion and collapse behaviour for heat treated Al‐TiH2 precursors has been shown to be driven by the oxidation of the Al powder, which can, in moderation, improve the foam expansion and increase foam stability, and the premature loss of gas from the TiH2, which delays but decreases the foam expansion. The evidence presented indicates that as long as theoretical precursor densities > 99 % can be achieved, simultaneous heating and compaction are not required to achieve the best foaming behaviour. Instead, the oxygen or oxide content in the powder is critical and if the oxygen content in the atomised powder is in the range 0.3–0.4 wt.%, cold compaction is sufficient to produce foams which show expansions at least as good as those for precursors made by high cost hot working processes.
The foam expansion and collapse behaviour for heat treated Al‐TiH2 precursors has been shown to be driven by the oxidation of the Al powder, which can, in moderation, improve the foam expansion and increase foam stability, and the premature loss of gas from the TiH2, which delays but decreases the foam expansion. The evidence presented indicates that as long as theoretical precursor densities >99% can be achieved, simultaneous heating and compaction are not required to achieve the best foaming behaviour. Instead, the oxygen or oxide content in the powder is critical and if the oxygen content in the atomised powder is in the range 0.3–0.4 wt.%, cold compaction is sufficient to produce foams which show expansions at least as good as those for precursors made by high cost hot working processes. |
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Bibliography: | SA is grateful for financial support from the Royal Thai Government. The supply of Al powders by the Aluminium Powder Company (ALPOCO) is also acknowledged. Royal Thai Government ArticleID:ADEM200600067 ark:/67375/WNG-793K1XHH-J istex:8C801B3046D49E3AC06D4A786780EE7BF7062F83 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1438-1656 1527-2648 |
DOI: | 10.1002/adem.200600067 |