Carbon heating element and method for manufacturing a carbon heating element

Patent metadata

Field	Value
Publication number	US-2018343704-A1
Application number	US-201815986107-A
Country	US
Kind code	A1
Filing date	May 22, 2018
Priority date	May 26, 2017
Publication date	Nov 29, 2018
Grant date	—

Abstract

A carbon heating element and a method for manufacturing a carbon heating element are provided. The carbon heating element may efficiently dissipate heat and prevent disconnection or destruction of a heating element to prolong a lifespan thereof without generating a spark and plasma under a high voltage. The carbon heating element may include carbon (C) and silicon carbide (SiC), and the carbon heating element may have a thermal conductivity of 1.6 W/m·K or more.

First claim

What is claimed is:

1 . A heating element for a carbon heater, the heating element comprising:
carbon (C); and silicon carbide (SiC), wherein the heating element has a thermal conductivity of 1.6 W/m·K or more.

2 . The heating element according to claim 1 , wherein the SiC includes β-SiC and α-SiC.

3 . The heating element according to claim 1 , wherein a degree of crystallization of the SiC in the heating element has a full width at half maximum (FWHM) value of 0.14 as a result of analyzing an X-ray diffraction.

4 . The heating element according to claim 1 , wherein the heating element includes silicon oxide (SiO 2 ).

5 . The heating element according to claim 4 , wherein a total amount of oxygen (O 2 ) in the heating element is 2 wt. % or less.

6 . The heating element according to claim 1 , wherein a specific resistance of the heating element is (11˜16)*10 −2 Ωcm.

7 . The heating element according to claim 1 , wherein the heating element is solid.

8 . The heating element according to claim 1 , wherein the heating element is hollow.

9 . A method for manufacturing a carbon heating element, the method comprising:
a process of mixing a heating element composition; a thermal extrusion process; a stabilization heat treatment process; and a carbonization heat treatment process.

10 . The method according to claim 9 , wherein the heating element composition includes:
a base material that determines a specific resistance of a heating element; a specific resistance controlling agent that controls a specific resistance of the heating element; a lubricant; and a binder for mechanical coupling between inorganic powders.

11 . The method according to claim 9 , wherein the base material is silicon carbide (SiC).

12 . The method according to claim 10 , wherein the specific resistance controlling agent is SiO 2 .

13 . The method according to claim 10 , wherein the lubricant is graphite.

14 . The method according to claim 10 , wherein the binder is a novolac resin.

15 . The method according to claim 9 , wherein the extrusion process is performed at a speed of about 60 rpm at 100 to 200° C.

16 . The method according to claim 9 , wherein the stabilization heat treatment process is performed at 270 to 320° C. for 10 minutes to 2 hours.

17 . The method according to claim 9 , wherein the carbonization heat treatment process includes a first carbonization heat treatment process for out-gassing at 600 to 1,000° C. for 10 minutes to 2 hours.

18 . The method according to claim 9 , wherein the carbonization heat treatment process includes a second carbonization heat treatment process.

19 . The method according to claim 18 , the second carbonization heat treatment process is performed at 1,200 to 1,400° C. for 10 minutes to 4 hours.

20 . The method according to claim 18 , wherein the carbonization heat treatment process further includes a third carbonization heat treatment process performed at 1,500 to 1,700° C. for 10 minutes to 4 hours.

21 . A carbon heating element manufactured using the method of claim 9 .

Assignees

• Lg Electronics Inc
• Univ Nat Chonnam Ind Found
• Univ Nat Chonnam Ind Found

Inventors

• Lee Youngjun
• Yang Kap Seung
• Kim Sang Wan

Classifications

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• H05B3/145 Primary

  Carbon only, e.g. carbon black, graphite · CPC title

• H05B3/03

  Electrodes · CPC title

• H05B3/44

  heating conductor arranged within rods or tubes of insulating material · CPC title

• H05B3/0076

  for cooking, e.g. in ovens (lamps specially adapted for non-metallic cooking plates H05B3/742, H05B3/744) · CPC title