Additives for lead- and cadmium-free glazes

Details Additives for lead- and cadmium-free glazes Additives for lead- and cadmium-free glazes

C - Chemistry, Metallurgy

03

C

C03C 17/04 (2006.01) C03C 8/06 (2006.01) C03C 8/14 (2006.01)

Patent

CA 2066496

This invention relates to a method for eliminating the grayish discoloration which commonly develops when lead- free and cadmium-free glass frits axe applied to substrates utilizing an organic medium and thereafter fired to fuse the frit particles into a glaze. The grayish discoloration contains a carbonaceous residue from the organic medium. The method comprises the four general steps: (1) adsorbing a coating of a strongly oxidizing metal ion species onto the surface of the frit particles; (2) mixing the coated frit particles with an organic medium; (3) applying that mixture to a substrate; and (4) firing the mixture to eliminate the organic medium and to oxidize the carbonaceous residue while fusing the frit particles into a glaze.

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