Preform made of aggregate elements such as balls and kaolin useful as destructible core for manufacturing an aluminum or aluminum alloy foam with open cells by foundry, where the elements are defined between gaps with a sufficient size

摘要

The preform (10) made of aggregate elements (12) such as balls and kaolin useful as destructible core for manufacturing an aluminum or aluminum alloy foam with open cells by foundry, is claimed. The elements are defined between gaps (13) with sufficient size to allow insertion of smelted metal or alloy, are aggregated with a polyurethane binder, and are made of sodium chloride. A mass of the binder is 1-3%, and a size of the elements is = 1 mm. A diameter of the balls is = 4 mm. An independent claim is included for a process for fabricating a metal or alloy foam with open cells.