METHOD FOR MANUFACTURING A PORCELAIN ENAMEL COATING OF A METAL SUBSTRATE AND ARTICLE OBTAINED BY THE METHOD

摘要

A method for manufacturing a porcelain enamel coating of a metal substrate comprises the steps of: preparing the surface of the metal substrate; applying a primer on the metal substrate; firing inside an oven at a temperature of between 750 and 900° C.; applying an enamel suspension comprising water and a glass frit; firing inside an oven at a temperature of between 700 and 900° C.; and repeating the last two steps according to the desired thickness of porcelain enamel. The method is characterized in that the glass frit comprises a quantity of lattice modifiers belonging to the transition metals, equal to less than 1% of the total volume of the glass frit; a quantity of opacifying oxides equal to less than 1% of the total volume of the glass frit is added to the glass frit. Moreover, the enamel suspension comprises a quantity of suspending agents with dimensions greater than the wavelength range of visible radiation, equal to less than 1% of the total volume of the glass frit.

主权项

1. A method for manufacturing a porcelain enamel coating of a metal substrate comprising steps of:
(a) preparing a surface of the metal substrate; (b) applying a primer on the metal substrate; (c) firing inside an oven at a temperature of between 750° C. and 900° C.; (d) applying an enamel suspension comprising water and a glass frit; (e) firing inside an oven at a temperature of between 700° C. and 900° C.; and (f) repeating steps (d) and (e) according to a desired thickness of porcelain enamel; characterized in that said glass frit comprises: (i) a quantity of lattice modifiers belonging to transition metals, equal to less than 1% of total volume of the glass frit;
(ii) a quantity of opacifying oxides equal to less than 1% of the total volume of the glass frit; and(iii) said enamel suspension comprises a quantity of suspending agents with dimensions greater than wavelength range of visible radiation, equal to less than 1% of total volume of the glass frit.