Glass composition, preparation method thereof, and cooking appliance including the same

Patent metadata

Field	Value
Publication number	US-9302932-B2
Application number	US-201313889950-A
Country	US
Kind code	B2
Filing date	May 8, 2013
Priority date	May 10, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Provided are a glass composition, preparation method thereof, and cooking appliance including the glass composition. The glass composition includes a glass frit containing P 2 O 5 , a Group I-based oxide, and a Group III-based oxide. The Group I-based oxide is selected from Na 2 O, K 2 O, and Li 2 O, the Group III-based oxide is selected from Al 2 O 3 and B 2 O 3 , and the glass frit contains about 40 wt % to about 75 wt % of P 2 O 5 .

First claim

What is claimed is:

1. A glass composition comprising:
a glass frit containing P 2 O 5 , ZnO, TiO 2 , a Group I-based oxide, and a Group III-based oxide,
wherein the Group I-based oxide comprises Na 2 O, K 2 O, and Li 2 O,
wherein the Group III-based oxide comprises Al 2 O 3 and B 2 O 3 , and
wherein the glass frit comprises 65 wt % to 75 wt % of P 2 O 5 , 1 wt % to 3 wt % of Al 2 O 3 , 15 wt % to 18 wt % of Na 2 O, 4 wt % to 5 wt % of K 2 O, 3 wt % to 4 wt % of B 2 O 3 , 2 wt % to 4 wt % of ZnO, and 0.1 wt % to 1 wt % of TiO 2 .

2. The glass composition according to claim 1 , wherein the glass frit further comprises one or more compounds selected from the group consisting of SiO2, ZrO2, CaO, MgO, BaO, and WO3.

3. A method of preparing a glass composition, the method comprising:
preparing a glass frit material comprising P 2 O 5 , ZnO, TiO 2 , a Group I-based oxide, and a Group III-based oxide;
melting the glass frit material; and
quenching the melted glass frit material to form a glass frit,
wherein the Group I-based oxide comprises Na 2 O, K 2 O, and Li 2 O,
wherein the Group III-based oxide comprises Al 2 O 3 and B 2 O 3 , and
wherein the glass frit comprises 65 wt % to 75 wt % of P 2 O 5 , 1 wt % to 3 wt % of Al 2 O 3 , 15 wt % to 18 wt % of Na 2 O, 4 wt % to 5 wt % of K 2 O, 3 wt % to 4 wt % of B 2 O 3 , 2 wt % to 4 wt % of ZnO, and 0.1 wt % to 1 wt % of TiO 2 .

4. A cooking appliance comprising:
a cavity defining a cooking chamber;
a door selectively opening or closing the cooking chamber;
a heating source providing heat to heat foods in the cooking chamber; and
a coating layer formed of the glass composition according to claim 1 , which is coated on a back surface of the door facing the cooking chamber in a state where the cooking chamber is covered.

5. The cooking appliance according to claim 4 , wherein the door comprises a transparent door glass, and
wherein the coating layer is coated on the door glass.

6. The cooking appliance according to claim 5 , wherein the door glass coated with the coating layer is tempered.

7. The cooking appliance according to claim 5 , wherein the coating layer coated on the door glass forms a pattern.

8. The glass composition according to claim 1 , wherein the glass frit has a glass deformation temperature of more than 410° C.

9. The glass composition according to claim 1 , wherein the glass frit has a light transmittance of 70% to 75%.

10. The glass composition according to claim 1 , wherein the glass frit has a diameter of 0.1 μm to 50 μm.

Assignees

• Lg Electronics Inc

Inventors

• Kim Youngseok
• Lee Yongsoo
• Kim Namjin
• Lee Youngjun

Classifications

• C03C3/21 Primary

  containing titanium, zirconium, vanadium, tungsten or molybdenum · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• C03C2207/04

  for steel · CPC title

• F24C15/005

  Coatings for ovens · CPC title

• C03C8/08

  containing phosphorus · CPC title