Exterior material of home appliance, home appliance including the exterior material, and manufacturing method thereof

A method of manufacturing a cooking apparatus, the method comprising:

• preparing a cooking compartment;
• forming an enamel coating layer on a surface of the cooking compartment;
• and
• heating the cooking compartment having the enamel coating layer at a temperature of 800° C. to 1000° C.,
• wherein the enamel coating layer comprises, in percent (%) by weight of the entire composition:
• 5% or less (excluding 0%) of a silicon dioxide (SiO2),
• 10% to 20% of an aluminum oxide (Al2O3),
• 10% to 20% of a phosphorous pentoxide (P2O5),
• 5% to 15% of a rare earth oxide, and
• 5% to 10% of a ferric oxide (Fe2O3).

An enamel composition comprising, in percent (%) by weight of the entire composition:

• 5% or less (excluding 0%) of a silicon dioxide (SiO2);
• 10% to 20% of an aluminum oxide (Al2O3);
• 10% to 20% of a phosphorous pentoxide (P2O5);
• 5% to 15% of a rare earth oxide;
• and
• 5% to 10% of a ferric oxide (Fe2O3).