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

Abstract

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include phosphorus pentoxide (P 2 O 5 ) at 15 to 50 wt %; silicon dioxide (SiO 2 ) at 10 to 20 wt %; boron oxide (B 2 O 3 ) at 1 to 15 wt %; one or more of lithium oxide (Li 2 O), sodium oxide (Na 2 O), or potassium oxide (K 2 O) at 5 to 20 wt %; one or more of sodium fluoride (NaF), calcium fluoride (CaF 2 ), or aluminum fluoride (AlF 3 ) 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 (TiO 2 ), cerium dioxide (CeO 2 ), molybdenum trioxide (MoO 3 ), bismuth oxide (Bi 2 O 3 ), or copper oxide (CuO) at 10 to 25 wt %, such that a heating time required for cleaning may be shortened and oil contaminants may be completely removed.

What is claimed is: 
     
         1 . A method for preparing an enamel composition, comprising:
 providing materials for the enamel composition, the materials including:   phosphorus pentoxide (P 2 O 5 ) at 15 to 50 wt %;   silicon dioxide (SiO 2 ) at 10 to 20 wt %;   boron oxide (B 2 O 3 ) at 1 to 15 wt %;   one or more of lithium superoxide (Li 2 O), sodium oxide (Na 2 O), or potassium oxide (K 2 O) at 5 to 20 wt %;   one or more of sodium fluoride (NaF), calcium fluoride (CaF 2 ), or aluminum fluoride (AlF 3 ) 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 (TiO 2 ), cerium dioxide (CeO 2 ), molybdenum trioxide (MoO 3 ), bismuth oxide (Bi 2 O 3 ), or copper oxide (CuO) at 10 to 25 wt %, wherein when both the MoO 3  and the Bi 2 O 3  are included, any one of the MoO 3  or the Bi 2 O 3  is included at 2 wt % or less.;   melting the materials; and   quenching the melted materials in a quenching roller to form the enamel composition.   
     
     
         2 . The method of  claim 1 , wherein the materials further include:
 aluminum oxide (Al 2 O 3 ) at 1 to 20 wt %;   zirconium dioxide (ZrO 2 ) at 1 to 5 wt %; and   one or more of tin oxide (SnO) or zinc oxide (ZnO) at 1 to 10 wt %.   
     
     
         3 . The method in  claim 1 , wherein the melting of the materials for the enamel composition includes melting the materials at about 1,200 to 1,400° C. for about one to two hours. 
     
     
         4 . The method in  claim 3 , wherein the melting of the materials for the enamel composition includes melting the materials at about 1,300° C. for about 1.5 hours. 
     
     
         5 . The method of  claim 1 , wherein the quenching of the melted material includes quenching the melted materials using a quenching roller. 
     
     
         6 . The method of  claim 1 , further comprising:
 applying the enamel composition to at least one of an inner surface of a cavity of a cooking appliance or an inner surface a door of the cooking appliance.   
     
     
         7 . The method of  claim 6 , wherein the applying of the enamel composition includes applying the enamel composition by a dry process that includes dispersing the quenched materials for the enamel composition in an organic binder, milling the quenched materials for the enamel composition and the organic binder to prepare a frit, and applying the frit to the at least one of the inner surface of the cavity of the cooking appliance or the inner surface the door of the cooking appliance. 
     
     
         8 . The method of  claim 6 , wherein the applying of the enamel composition includes applying the enamel composition by a wet process that includes dispersing the quenched materials for the enamel composition in water and a pigment, milling the materials for the enamel composition, water, and the pigment to prepare a frit, and applying the frit to the at least one of the inner surface of the cavity of the cooking appliance or the inner surface the door of the cooking appliance. 
     
     
         9 . The method of  claim 6 , wherein the applying of the enamel composition includes:
 spraying a frit that includes the quenched materials for the enamel composition to the at least one of the inner surface of the cavity of the cooking appliance or the inner surface the door of the cooking appliance; and   firing the sprayed frit.   
     
     
         10 . The method of  claim 9 , wherein the spraying of the frit includes spraying about 300 g/m2 of the frit onto a steel sheet substrate. 
     
     
         11 . The method of  9 , wherein the spraying of the frit includes directly applying a single layer of the frit onto a steel sheet substrate without using an interposing buffer layer, and wherein the frit is applied to form a coating layer having a thickness of about to 250 μm, and the frit is fired at about 830 to 870° C. for about 300 to 450 seconds.