PURPOSE: To more surely prevent discoloration of pigment by burning (especially quick burning) and obtain an excellent color development.
CONSTITUTION: The first aimed pigment 1 contains pigment component particles 3 enclosed in SiO3 sintered particles 2 and the second aimed porcelain is colored with the pigment 1. The pigment 1 is produced by mixing pigment component powder with SiO2 powder, sintering and crushing. In this method, pigment component particles 3 such as Fe2O3-based particles are enclosed in quartz and/or cristobalite of SiO2 sintered particles 2 and the pigment component particles are protected by covering layers of SiO2. In mixing within porcelain body, molding and burning, a reaction of glass or mullite component generating from the body component at the burning and the pigment component is inhibited with the SiO2 covering layer and the pigment component clearly develops essential pigment color. A porcelain having beautiful color is given by excellent color development even in a dense sintered material obtained by a high- temperature burning in a quick burning method.
KOBAYASHI TAKAMICHI
KAWAI HIDEJI
MURAGUCHI YUKITO
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