Enamel composition, method for preparing enamel composition, and cooking appliance

A cooking appliance, comprising:

• a cavity that forms a cooking chamber;
• a door that selectively opens and closes the cooking chamber;
• at least one heating source that provides heat to the cooking chamber;
• and
• a coating layer formed of an enamel composition applied onto an inner surface of the cavity or an inner surface of the door, wherein the enamel composition comprises:
• phosphorus pentoxide (P2O5) at 15 to 50 wt %;
• silicon dioxide (SiO2) at 10 to 20 wt %;
• boron oxide (B2O3) at 1 to 15 wt %;
• one or more of lithium oxide (Li2O), sodium oxide (Na2O), or potassium oxide (K2O) at 5 to 20 wt %;
• one or more of sodium fluoride (NaF), calcium fluoride (CaF2), or aluminum fluoride (AlF3) at 1 to 5 wt %;
• one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO) at 1 to 35 wt %;
• and
• one or more of titanium dioxide (TiO2), cerium dioxide (CeO2), molybdenum trioxide (MoO3), bismuth oxide (Bi2O3), or copper oxide (CuO) at 10 to 25 wt %, wherein when both the MoO3 and the Bi2O3 are included, any one of the MoO3 or the Bi2O3 is included at 2 wt % or less.