Study on Preparation of Foamed Zn-Al Eutectoid Alloy by Air Pressure Infiltration Process

Jian-Ning Wei, Zhang-Yong Chang, Gen-Mei Li


This work reports the technology of preparation about foamed Zn-Al eutectoid alloy, which were prepared by an air pressure infiltration process using NaCl crystals as place holders. The method consists of five sequential processes: particles preprocessing, preparing preform, preheating, infiltration casting, machining and cleaning. The porosity of foamed Zn-Al eutectoid alloy is 61%. The mean diameter of macroscopic pore is on the order of a millimeter (1.0 mm) in the foamed Zn-Al eutectoid alloy with open-pore structure.


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