Annular structure having excellent heat insulating and heat releasing properties

Patent metadata

Field	Value
Publication number	US-9546820-B2
Application number	US-201414493804-A
Country	US
Kind code	B2
Filing date	Sep 23, 2014
Priority date	Sep 12, 2006
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A structure of the present invention is the structure which is formed of a base made of a metal and an inorganic material surface layer made of crystalline and amorphous inorganic materials, wherein thermal conductivity of the inorganic material surface layer is lower than the thermal conductivity of the base, infrared emissivity of the inorganic material surface layer is higher than the infrared emissivity of the base, and the base is an annular body.

First claim

What is claimed as new and desired to be secured by letters patent of the United States is:

1. An annular structure, comprising:
a base made of a metal and formed into an annular body having a cylindrical form or a cylindroid form; and
an inorganic material surface layer made of crystalline inorganic material and amorphous inorganic material,
wherein the metal of the base includes steel, iron, copper, or stainless steel, the inorganic material surface layer has a thermal conductivity which is lower than a thermal conductivity of said base, and the inorganic material surface layer has an infrared emissivity which is higher than an infrared emissivity of said base.

2. The annular structure according to claim 1 , wherein the thermal conductivity of said inorganic material surface layer at room temperature is at least about 0.1 W/mK and at most about 2.0 W/mK.

3. The annular structure according to claim 1 , wherein the emissivity of said inorganic material surface layer at room temperature at a wavelength in a range of 1 μm to 15 μm is at least about 0.70 and at most about 0.98.

4. The annular structure according to claim 1 , wherein a degree of irregularities, Rz JIS , on a surface of said base is about 1/60 or more of a thickness of said inorganic material surface layer.

5. The annular structure according to claim 1 , wherein said inorganic material surface layer is formed on at least one of an outer surface and an inner surface of said base.

6. The annular structure according to claim 1 , wherein the metal of said base includes stainless steel.

7. The annular structure according to claim 1 , wherein said crystalline inorganic material comprises at least one kind selected from the group consisting of manganese dioxide, manganese oxide, iron oxide, cobalt oxide, copper oxide and chromium oxide.

8. The annular structure according to claim 1 , wherein said amorphous inorganic material comprises at least one kind selected from the group consisting of barium glass, boron glass, strontium glass, alumina-silicate glass, soda zinc glass and soda barium glass.

9. The annular structure according to claim 1 , wherein said amorphous inorganic material has a softening temperature of at least about 400° C. and at most about 1000° C.

10. The annular structure according to claim 1 , wherein said inorganic material surface layer and said base have a difference in a thermal expansion coefficient of about 10×10 −6 /° C. or less.

11. A method of producing an annular structure, comprising:
forming a base into an annular body having a cylindrical form or a cylindroid form; and
forming an inorganic material surface layer on an outer surface of the annular body,
wherein the base includes steel, iron, copper, or stainless steel, the inorganic material surface layer has a thermal conductivity which is lower than a thermal conductivity of said base, the inorganic material surface layer has an infrared emissivity which is higher than an infrared emissivity of the base, the inorganic material surface layer is formed by a process comprising preparing a slurry and solidifying the slurry on the outer surface of the annular body, and the slurry comprises powders of a crystalline inorganic material and an amorphous inorganic material suspended therein.

12. The method according to claim 11 , wherein the thermal conductivity of said inorganic material surface layer at room temperature is at least about 0.1 W/mK and at most about 2.0 W/mK.

13. The method according to claim 11 , wherein the emissivity of the inorganic material surface layer at room temperature at a wavelength in a range of 1 μm to 15 μm is at least about 0.70 and at most about 0.98.

14. The method according to claim 11 , wherein a degree of irregularities, Rz JIS , on a surface of the base is about 1/60 or more of a thickness of the inorganic material surface layer.

15. The method according to claim 11 , wherein the inorganic material surface layer is formed on at least one of an outer surface and an inner surface of said base.

16. The method according to claim 11 , wherein the base is made of stainless steel.

17. The method according to claim 11 , wherein the crystalline inorganic material comprises at least one kind selected from the group consisting of manganese dioxide, manganese oxide, iron oxide, cobalt oxide, copper oxide and chromium oxide.

18. The method according to claim 11 , wherein the amorphous inorganic material comprises at least one kind selected from the group consisting of barium glass, boron glass, strontium glass, alumina-silicate glass, soda zinc glass and soda barium glass.

19. The method according to claim 11 , wherein the amorphous inorganic material has a softening temperature of at least about 400° C. and at most about 1000° C.

20. The method according to claim 11 , wherein the inorganic material surface layer and said base have a difference in a thermal expansion coefficient of about 10×10 −6 /° C. or less.

21. The method according to claim 11 , wherein the crystalline inorganic material in powder form and the amorphous inorganic material in powder form are mixed in the powders such that the inorganic material surface layer comprises the crystalline inorganic material in an amount of from about 30 wt. % to about 70 wt. %.

Assignees

• Ibiden Co Ltd

Inventors

• Ito Yasutaka

Classifications

• Y10T428/131

  Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.] · CPC title

• C23C16/30

  Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides · CPC title

• C30B15/14

  Heating of the melt or the crystallised materials · CPC title

• Y10T428/1352

  Polymer or resin containing [i.e., natural or synthetic] · CPC title

• Y10T428/13

  Hollow or container type article [e.g., tube, vase, etc.] · CPC title