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Abstract

A lead-free ceramic glaze comprising, by weight: (i) between about 27 and 35% SiO.sub.2 ; (ii) between about 9 and 15% Al.sub.2 O.sub.3 ; (iii) between about 26 and 34% B.sub.2 O.sub.3 ; (iv) between about 4 and 9% BaO; (v) up to about 2.5% CaO; (vi) between about 3 and 8% SrO; (vii) between about 6 and 12% ZnO; (viii) up to about 1% K.sub.2 O; (ix) between about 1 and 4% Li.sub.2 O; (x) between about 1.5 and 3% Na.sub.2 O; and (xi) balance of minor impurities. Also disclosed are ceramic substrates spray coated with such composition and a method for making a lead-free glaze to a ceramic substrate using lower firing temperatures, on the order of 1550.degree. to 1650.degree. F. (843.degree. to 899.degree. C.).

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First Claim