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

Patent metadata

Field	Value
Publication number	US-11773007-B2
Application number	US-202016796052-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 22, 2019
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include 15 to 50 wt % of phosphorus pentoxide (P 2 O 5 ); 5 to 20 wt % of one or more of lithium oxide (Li 2 O), sodium oxide (Na 2 O), or potassium oxide (K 2 O); 1 to 5 wt % of one or more of sodium fluoride (NaF), calcium fluoride (CaF 2 ), or aluminum fluoride (AlF 3 ); 1 to 35 wt % of one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO); and 5 to 30 wt % of one or more of manganese dioxide (MnO 2 ), molybdenum trioxide (MoO 3 ), bismuth oxide (Bi 2 O 3 ), or nickel oxide (NiO). The enamel composition may be cleaned without being putting it into water.

First claim

What is claimed is:

1. A cooking appliance, comprising:
a cavity in which a cooking chamber is formed;
a door that opens and closes the cooking chamber;
at least one of heat sources that supply heat for heating an object to be cooked in the cooking chamber;
a buffer layer coated on an inner surface of the cavity or an inner surface of the door; and
a coating layer coated on the buffer layer and formed using an enamel composition, wherein the enamel composition comprises:
15 to 50 wt % of phosphorus pentoxide (P 2 O 5 );
5 to 20 wt % of one or more of lithium oxide (Li 2 O), sodium oxide (Na 2 O), or potassium oxide (K 2 O);
1 to 5 wt % of one or more of sodium fluoride (NaF), calcium fluoride (CaF 2 ), or aluminum fluoride (AlF 3 );
1 to 35 wt % of one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO);
5 to 30 wt % of one or more of manganese dioxide (MnO 2 ), molybdenum trioxide (MoO 3 ), bismuth oxide (Bi 2 O 3 ), or nickel oxide (NiO); and
2 or less wt % of titanium dioxide (TiO 2 ), wherein when the enamel composition includes both MoO 3 and Bi 2 O 3 , 2 or less wt % of any one of MoO 3 or Bi 2 O 3 is included.

2. The cooking appliance of claim 1 , wherein the enamel composition further comprises:
20 or less wt % of silicon dioxide (SiO 2 ).

3. The cooking appliance of claim 1 , wherein the enamel composition further comprises:
15 or less wt % of Bi 2 O 3 .

4. The cooking appliance of claim 1 , wherein the enamel composition further comprises:
1 to 20 wt % of aluminum oxide (Al 2 O 3 );
1 to 5 wt % of zirconium dioxide (ZrO 2 ); and
1 to 20 wt % of one or more of tin oxide (SnO) or zinc oxide (ZnO).

Assignees

• Lg Electronics Inc

Inventors

• Gwoo Dong Gun
• Kim Jingon
• Kim Young Seok

Classifications

• C03C8/08 Primary

  containing phosphorus · CPC title

• A47J36/025

  Vessels with non-stick features, e.g. coatings · CPC title

• A47J36/04

  the materials being non-metallic · CPC title

• C03C3/064

  containing boron · CPC title

• C03C3/066

  containing zinc · CPC title