METHOD FOR FORMING A QUICKLY HARDENING INORGANIC FOAM

摘要

The invention relates to a method for forming a quickly hardening inorganic foam on the basis of the reaction of two components: a) a solid component in the form of a reactive powder which simultaneously has both framework forming properties and pore forming properties and b) a liquid component in the form of an alkali metal silicate (water glass) wherein the reactive powder contains 45 65 wt% of aluminum oxide 10 20 wt% of aluminum nitride and 5 15 wt% of metal aluminum as essential constituents the alkali metal silicate has a molar ratio of silicon oxide to metal oxide of 1.0 2.2 and the two components are mixed at a weight ratio of powder to liquid component of 0.5 2 to form a paste from which a foam body having a bulk density less than 0.7 g/cm3 is then formed in an exothermic reaction in less than 10 minutes.