Enamel composition, method for preparation thereof and cooking appliance using same

A method for preparation of an enamel composition, comprising:

• providing an enamel composition material that consists of 13 to 30 wt % of phosphorus pentoxide (P2O5), 20 to 45 wt % of silicon dioxide (SiO2), 5 to 18 wt % of aluminum oxide (Al2O3), 10 or less wt % of zirconium dioxide (ZrO2), 2 to 15 wt % of sodium oxide (Na2O), 5 to 20 wt % of potassium oxide (K2O), 2 to 5 wt % of lithium oxide (Li2O), 1 to 5 wt % of sodium fluoride (NaF), 8 to 12 wt % of boron trioxide (B2O3), 5 or less wt % of titanium dioxide (TiO2), 5.7 to 10 wt % of vanadium oxide (V2O5);
• and 5 or less wt % in total of (i) cobalt tetraoxide (Co3O4) and (ii) one or more of manganese oxide (MnO2), nickel oxide (NiO), and iron oxide (Fe2O3);
• melting the enamel composition material;
• and
• cooling the melted enamel composition material.

A cooking appliance comprising:

• a cabinet;
• a cooktop unit positioned at the cabinet and having at least one grate configured to support an object to be cooked, the cooking unit including by a burner configured to heat the object;
• and
• an enamel coating layer coated on a surface of the grate,
• wherein the enamel consists of includes 13 to 30 wt % of phosphorus pentoxide (P2O5), 20 to 45 wt % of silicon dioxide (SiO2), 5 to 18 wt % of aluminum oxide (Al2O3), 10 or less wt % of zirconium dioxide (ZrO2), 2 to 15 wt % of sodium oxide (Na2O), 5 to 20 wt % of potassium oxide (K2O), 2 to 5 wt % of lithium oxide (Li2O), 1 to 5 wt % of sodium fluoride (NaF), 8 to 12 wt % of boron trioxide (B2O3), 5 or less wt % of titanium dioxide (TiO2), 5.7 to 10 wt % of vanadium oxide (V2O5);
• and 5 or less wt % in total of (i) cobalt tetraoxide (Co3O4) and (ii) one or more of manganese oxide (MnO2), nickel oxide (NiO), and iron oxide (Fe2O3).