Patent ID: 7303704

Claim:
A method of manufacturing lightweight ceramics, comprising the steps of: A. mixing a powdered glass material, a powdered alkali silicate, and a water-soluble polymer according to a fixed proportion to produce a dry substrate; B. adding water to the dry substrate and molding the substrate into a desired shape to produce a molded substrate; C. removing part of the water; and D. heating the molded substrate to a predetermined temperature to form a ceramic; wherein, in the heating step D, oxide and hydroxide in the alkali silicate being used to lower the softening point to the powdered glass material, and when the powdered glass material being in a semi fluid state, air and crystal water brought by the alkali silicate being expanded and forming air bubbles, the water-soluble polymer being converted into a gas and forming close pores inside the ceramic, pores with open passages on the surface of the ceramic.