Carbonates as Foaming Agent in Chip-based Aluminium Foam Precursor

Replacement of TiH2 as foaming agent by CaCO3（lime） and CaMg（CO3）2（dolomite） for AlMg4.5-and AlSi9Cu3-foams was investigated considering inluences on foaming capability and cellular structure.Precursor materials were produced from alloy chip and powder mixtures by means of the thixocasting process.A...

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Published inJournal of materials science & technology Vol. 26; no. 9; pp. 845 - 850
Main Authors Haesche, Marco, Lehmhus, Dirk, Weise, Jörg, Wichmann, Manfred, Mocellin, Irene Cristina Magnabosco
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2010
Subjects
Aluminium foam
Calcium carbonate
Dolomite
Foaming agent
Stabilisation
化学剂
发泡剂
合金材料
泡沫铝
碳酸盐
碳酸钙分解
Aluminium foam
Foaming agent
Dolomite
Stabilisation
Calcium carbonate
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Summary:Replacement of TiH2 as foaming agent by CaCO3（lime） and CaMg（CO3）2（dolomite） for AlMg4.5-and AlSi9Cu3-foams was investigated considering inluences on foaming capability and cellular structure.Precursor materials were produced from alloy chip and powder mixtures by means of the thixocasting process.AlSi9Cu3 variants showed expansion levels suffcient for commercial use.Variations in expansion observed when CaCO3 and CaMg（CO3）2 were compared as foaming agent are explained based on the course of decomposition.Improved performance of dolomite-based foams relies on formation of stabilizing MgO phases,which do not develop during decomposition of CaCO3 in Al-Si-Cu alloys
Bibliography:TQ314.259
21-1315/TG
Dolomite
P578.6
Calcium carbonate
Aluminium foam
Foaming agent
Stabilisation
Aluminium foam; Foaming agent; Calcium carbonate; Dolomite; Stabilisation
ISSN:1005-0302
1941-1162
DOI:10.1016/S1005-0302(10)60135-1