MANUFACTURE OF ALUMINUM CLOSED-CELL FOAM BY ARB PROCESS USING CaCO3AS THE BLOWING AGENT

Abstract: the aim of the present study is to fabricate aluminum closed-cell foamviaaccumulative roll-bonding (arb) technique using calcium carbonate (caco3)as the blowing agent.calcium carbonate is an inexpensive material and imparts relatively high porosity to the produced foam. the effects of heating rate,foaming temperature and time on percentageofporosity havebeeninvestigated. the results show that increasing thefoaming temperature and timeresults improvements in the foaming process. it is also shown that the heating rate does not any effecton the percentage of porosity. pores havespherical shape and they form in a regular structure by use of caco3 as the blowing agent. sample should be heated up abruptly using tih2 as the blowing agent from decomposition temperature of tih2 to foaming temperature in order to gain high porosity foam. it is found that increasing the numbers of accumulative rolling cycle causes uniform distribution of calcium carbonate powder and increases porosity in the final foam by up to 55%.