Stability of Pore Structure of ZL102 Al-alloy Foam Prepared by Secondary Foaming Method
SiC/ZL102 Al-alloy composite foam was prepared via secondary foaming process in the temperature range of 660℃～700℃,by taking the prepared SiC/ZL102 Al-alloy composites with addition of appropriate foaming agent and various SiC amount as precursors.The influence of viscosity of melt composites on the stability of ZL102 Al-alloy foam was studied by revealing the relation between the SiC content with the density of precursor,the variation of porosity,pore number,average pore size and pore wall thickness of the prepared ZL102 Al-alloy foams at different temperatures.The acquired foams were characterized by means of EDS,SEM and super deep field microscope.The results show that with the in-creasing SiC content the density of the precursors is increased,whilst,the density,precursor with 6wt.％ SiC is the highest.The suitable secondary foaming temperature is 680℃.With the increasing foaming temperature,the average pore size and pore wall thickness of low viscosity Al-alloy foam decrease,while the average pore size of high viscosity Al-alloy foam increases and the pore wall thickness decreases.The high viscosity Al-alloy foam has stable pore structure and higher porosity.
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