Patent ID: 6478993
Filing Date: 2002-11-12
Classification: C03C,C04B

Abstract:
A method of forming foamed structural articles comprising:a) preparing a homogenous mixture of at least one inorganic oxygen-containing, water-insoluble raw material having a particle size <60 microns and at least one gas forming reagent having a particle size <30 microns, wherein the homogeneous mixture is prepared to include 99.0-99.95 wt % raw material and 0.05-1.0 wt % gas forming reagent; b) humidifying and shaping the mixture; c) heating the shaped mixture to a formation temperature sufficient to melt the raw material to provide an oxygen-containing molten liquid phase; d) at the formation temperature, reacting the gas forming reagent with the oxygen-containing molten liquid phase to produce a molten liquid foamed material; and e) cooling the resultant foamed material to a solid state.