Patent Number: 6,251,814

Title: Light-weight pottery article

Abstract: This invention provides a light-weight pottery article with lower specific gravity than that of general pottery as well as a process for producing the same. The light-weight pottery article of the invention is produced by adding a lightening agent to clay based on silica and alumina, forming the resulting kneaded material into a desired form and calcinating the formed material, wherein the lightening agent is microspherical hollow ceramic powder having a hollow structure based on silica and alumina, the surface of said hollow ceramic powder is coated with an inorganic coating layer based on a silicate compound (e.g. sodium silicate, potassium silicate etc.), said hollow ceramic powder is contained in such a state as to be uniformly dispersed at a proportion of 20 to 80% by weight in the base materials, and in said base materials there is a structure in which the neighboring hollow ceramic powders have been integrated with one another via said inorganic coating layer. The present process for producing said pottery article comprises mixing said clay with hollow ceramic powder, further adding water to knead the mixture, drying and calcination thereof.

Inventors: Kawai; Tadashi (Yamashina-ku, Kyoto, JP)


International Classification: C04B 38/08 (20060101); C04B 20/00 (20060101); C04B 038/00 (); C04B 033/24 ()

Expiration Date: 06/26/2018