Patent ID: 7727637

Claim:
A coating layer structure for aluminum heat-cookers having a corrugated pattern ( 2 ) formed on an inner surface of a body ( 1 ) of said cookers wherein an aluminum oxide layer ( 3 ) is formed on said corrugated pattern by anodic oxidation, characterized in that said structure has an anion and far infrared ray-emitting inorganic ceramic coating layer ( 4 ) formed on said aluminum oxide layer ( 3 ), wherein said inorganic ceramic coating layer ( 4 ) comprises in admixture the following components: 40-50 wt % of a binding agent, which is silane or an oligomer derived therefrom, as a binder; 27-34 wt % of a silicon mixture which chemically binds said silane or an oligomer derived therefrom as a binding agent and consists of a mixture of 20-40 wt % of powdered silicon oxide having a particle size of 0.1-1.0 μm and 60-80 wt % of water; 10-19 wt % of powdered functional filler which prevents the crack of a film between said binding agent and said silicon mixture and controls the viscosity such that the physico-chemical properties of the film are improved, said filler being comprised of one or more of natural stone material selected from the group consisting of tourmaline, yellow ocher, sericite, amethyst, bamboo charcoal, obsidian, elvan and lava; 5-15 wt % of ceramic powder consisting of a far infrared ray-emitting material and an anion-emitting material wherein said far infrared ray-emitting material comprises one or more natural mineral materials selected from the group consisting of quartz, monzonite, gneiss and rhyolitic tuff, and said anion-emitting material is one stone material selected from the group consisting of strontium, vanadium, zirconium, cerium, neodymium, lanthanum, barium, rubidium, cesium and gallium; and 1-2 wt % of pigment which produces color.