초록 ▼

In a method of forming porcelain enamel layer on a metal substrate, the method comprises steps of applying a first coating for an underlying ground layer and a second coating for overlying self-cleaning layer or coloring layer, and the method is characterized by firing both of said first coating and

In a method of forming porcelain enamel layer on a metal substrate, the method comprises steps of applying a first coating for an underlying ground layer and a second coating for overlying self-cleaning layer or coloring layer, and the method is characterized by firing both of said first coating and said second coating at the same time, forming a double layered porcelain enamel layer having an inter-layer wherein both layers are mixed, thus giving a sufficient bonding force inbetween as well as strong corrosion resistivity of the substrate due to few pinholes and bubbles in the underlying ground coating.

대표청구항 ▼

A method of forming porcelain enamels on a dip aluminized steel sheet comprising the sequential steps of: (a) applying a first coating of a first slip adapted to form a first layer, said first slip containing a frit and a binder selected from the group consisting of an alkali silicate, colloidal sil

A method of forming porcelain enamels on a dip aluminized steel sheet comprising the sequential steps of: (a) applying a first coating of a first slip adapted to form a first layer, said first slip containing a frit and a binder selected from the group consisting of an alkali silicate, colloidal silica, colloidal alumina, silicone resins, organic binders, and mixtures thereof; (b) drying said first coating at a temperature below the softening point of said frit in said first slip at a temperature less than 350°C.; (c) applying a second coating of a second slip adapted to form a second layer; and (d) firing said first and second coatings in a single firing step after the application of all the slip coatings.