Exterior material of home appliance, home appliance including the exterior material, and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11078107-B2
Application number	US-201816123623-A
Country	US
Kind code	B2
Filing date	Sep 6, 2018
Priority date	Sep 6, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A cooking apparatus including an enamel coating layer having an improved cleaning efficiency and a manufacturing method therefor are provided. The cooking apparatus includes a cooking compartment configured to accommodate a cooking object, a door configured to open and close the cooking compartment, and an enamel coating layer provided on a surface of the cooking compartment. The enamel coating layer includes, in percent (%) by weight of the entire composition, 5% or less (excluding 0%) of a silicon dioxide (SiO2), 10% to 20% of an aluminum oxide (Al2O3), 10% to 20% of a phosphorous pentoxide (P2O5), 5% to 15% of a rare earth oxide, and 5% to 10% of a ferric oxide (Fe2O3).

First claim

What is claimed is:

1. A cooking apparatus comprising:
a cooking compartment configured to accommodate a cooking object;
a door configured to open and close the cooking compartment; and
an enamel coating layer provided on a surface of the cooking compartment,
wherein, the enamel coating layer comprises, in percent (%) by weight of the entire composition:
5% or less (excluding 0%) of a silicon dioxide (SiO 2 ),
10% to 20% of an aluminum oxide (Al 2 O 3 ),
10% to 20% of a phosphorous pentoxide (P 2 O 5 ),
5% to 15% of a rare earth oxide, and
5% to 10% of a ferric oxide (Fe 2 O 3 ).

2. The cooking apparatus of claim 1 , wherein the ratio of the aluminum oxide (Al 2 O 3 ) to the phosphorous pentoxide (P 2 O 5 ) is 0.5 to 1:1 by weight.

3. The cooking apparatus of claim 1 , wherein the ratio of the ferric oxide (Fe 2 O 3 ) to the aluminum oxide (Al 2 O 3 ) is 0.5 to 1:1 by weight.

4. The cooking apparatus of claim 1 , wherein the ratio of the rare earth oxide to the phosphorous pentoxide (P 2 O 5 ) is 0.3 to 1:1 by weight.

5. The cooking apparatus of claim 1 , wherein the rare earth oxide is selected from the group consisting of a cerium oxide (CeO 2 ), a lanthanum oxide (La 2 O 3 ), and a samarium oxide (Sm 2 O 3 ).

6. The cooking apparatus of claim 1 , wherein the enamel coating layer further comprises a binder selected from the group consisting of a cobalt oxide (CoO), a nickel oxide (NiO), a tin oxide (SnO), and a copper oxide (CuO).

7. The cooking apparatus of claim 1 , wherein the enamel coating layer further comprises at least one of an alkali metal oxide or an alkaline earth metal oxide.

8. The cooking apparatus of claim 1 , further comprising:
an intermediate coating layer provided between the cooking compartment and the enamel coating layer,
wherein the intermediate coating layer comprises a silicon dioxide (SiO 2 ) and a boron trioxide (B 2 O 3 ) in a total content of 10% or more and 80% or less by weight.

9. The cooking apparatus of claim 8 , wherein the intermediate coating layer includes a thickness equal to or smaller than a thickness of the enamel coating layer.

10. A method of manufacturing a cooking apparatus, the method comprising:
preparing a cooking compartment;
forming an enamel coating layer on a surface of the cooking compartment; and
heating the cooking compartment having the enamel coating layer at a temperature of 800° C. to 1000° C.,
wherein the enamel coating layer comprises, in percent (%) by weight of the entire composition:
5% or less (excluding 0%) of a silicon dioxide (SiO 2 ),
10% to 20% of an aluminum oxide (Al 2 O 3 ),
10% to 20% of a phosphorous pentoxide (P 2 O 5 ),
5% to 15% of a rare earth oxide, and
5% to 10% of a ferric oxide (Fe 2 O 3 ).

11. The method of claim 10 , further comprising:
performing an etching process on the prepared cooking compartment.

12. The method of claim 11 , wherein the performing of the etching process comprises performing an etching process on the prepared cooking compartment using nitric acid at a concentration of 20 g/L to 300 g/L.

13. The method of claim 10 , further comprising:
performing a sand blast process on the prepared cooking compartment.

14. The method of claim 10 , further comprising:
performing a manganese phosphate process on the prepared cooking compartment.

15. The method of claim 10 , further comprising:
after the preparing of the cooking compartment, preparing an intermediate coating layer on a surface of the cooking compartment,
wherein the intermediate coating layer includes a silicon dioxide (SiO 2 ) and a boron trioxide (B 2 O 3 ) in a total content of 10% or more and 80% or less by weight.

16. The method of claim 15 , further comprising:
after the forming of the intermediate coating layer, drying the intermediate coating layer.

17. The method of claim 15 , wherein the forming of the intermediate coating layer comprises forming the intermediate coating having a thickness equal or smaller than a thickness of the enamel coating layer.

18. The method of claim 15 , further comprising:
after the forming of the intermediate coating layer, heating the intermediate coating layer at a temperature of 800° C. to 900° C.

19. The method of claim 18 , wherein the forming of the intermediate coating layer comprises preparing the intermediate coating having a thickness equal or smaller than a thickness of the enamel coating layer.

20. An enamel composition comprising, in percent (%) by weight of the entire composition:
5% or less (excluding 0%) of a silicon dioxide (SiO 2 );
10% to 20% of an aluminum oxide (Al 2 O 3 );
10% to 20% of a phosphorous pentoxide (P 2 O 5 );
5% to 15% of a rare earth oxide; and
5% to 10% of a ferric oxide (Fe 2 O 3 ).

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Kyoung Mok
• Kim Seulkiro
• Oh Yu Jeong
• Lee Jong Ho
• Lim Jung Soo
• Kwon Ki Hwan
• Park Yong Jong
• Yoo Hyun Sang
• Yoon Boo-Keun
• Lim Hee Tae

Classifications

• C23D5/04

  by dry methods · CPC title

• C23D5/02

  by wet methods · CPC title

• A47J31/4403

  Constructional details · CPC title

• C03C3/095

  containing rare earths · CPC title

• C03C2207/00

  Compositions specially applicable for the manufacture of vitreous enamels · CPC title