Rare earth-containing alkali silicate frits and their use for the preparation of porcelain enamel coatings with improved cleanability

摘要

The present invention relates to a rare earth-containing, alkali silicate frit which may be applied to a metal substrate to provide a porcelain enamel coating which has good thermal stability, an acid resistance of A on the PEI scale and improved cleanability, wherein the frit contains, based on the total weight of the frit: -Oxide Wt. % -R2O 10-30 -MgO 0-5 -B2O3 0-5 -SiO2 45-60 -TiO2 0-10 -F 0.5-5 -CoO 0-3 -NiO 0-5 -X 12-30 - wherein R represents an alkali metal and X represents a rare earth oxide having an atomic number of 57-60, preferably cerium oxide. The present invention is also directed to porcelain enamel coatings, especially for appliances, prepared from this rare earth-containing, alkali silicate frit.