Lead-free ceramic pink-coloring material consisting of chromium-tin-calcium-silicon-alkali metal oxide plus bismuth and/or phosphorus oxide and process
AssigneeDegussa AG
InventorsRobert Fischer, Heinz-Dieter DeAhna
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Abstract
Ceramic pink-colored materials having the basis Ca-Sn-Cr-oxide, Ca-Sn-Si-Cr-oxide and Zr-Ti-Sn-Cr-oxide generally containing lead for the formation of an intense red color. The toxic lead can be eliminated by adding to the colored bodies 0.01-10% bismuth and/or phosphorus.
Claims9
In a lead-free ceramic pink-coloring material consisting of calcium oxide, tin oxide, silica, chromium oxide, and alkali metal oxide, the improvement of an addition from about 0.1 to 10% bismuth, phosphorus, or a mixture of bismuth and phosphorus, the bismuth being in the form of an oxide or an oxide forming compound and the phosphorus being in the form of an oxide or alkali metal phosphate.
Dependencies are inferred from the claim text.