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

Patent metadata

Field	Value
Publication number	US-11780766-B2
Application number	US-202016796102-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 22, 2019
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include 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 %, such that a heating time required for cleaning may be shortened and oil contaminants may be completely removed.

First claim

What is claimed is:

1. 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 (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 %, 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.

2. The cooking appliance of claim 1 , wherein the enamel composition further comprises:
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 %.

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