Patent ID: 6242117
Filing Date: 2001-06-05
Classification: C04B

Abstract:
A ceramic object comprising a glaze applied to a surface of a ceramic blank comprising crystal and glass phases with alkali oxides and alkaline earth oxides contained in the glass phase, wherein a mole ratio of alkaline earth oxides to the total amount of alkali oxides and alkaline earth oxides is 30 mol % or higher, and comprising quartz in said crystal phase, said blank having a least one of a bending strength of 100 MPa or higher and a firing shrinkage rate of 7% or higher, the ceramic blank having a porosity of 7.5% or higher, said object having at least one of a thermal shock resistance of 120.degree. C., a firing shrinkage rate of 12% or lower, a firing deformed amount of 25 mm or smaller and a deformed amount after reheating at 1200.degree. C. of 15 mm or smaller.