Method of manufacturing tubular member for exhaust gas treatment device, and coating film forming device

Patent metadata

Field	Value
Publication number	US-11660635-B2
Application number	US-202117643601-A
Country	US
Kind code	B2
Filing date	Dec 10, 2021
Priority date	Mar 15, 2021
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

A method of manufacturing a tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass, includes steps of: forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and firing the coating film to obtain the insulating layer. The spraying is performed while the tubular main body is rotated with a length direction thereof being a rotation axis.

First claim

What is claimed is:

1. A method of manufacturing a tubular member for an exhaust gas treatment device, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass,
the method comprising steps of:
forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and
firing the coating film to obtain the insulating layer,
wherein the tubular main body is subjected to heating at a heating temperature of 50° C. to 120° C.; and
the spraying is performed while the tubular main body subjected to heating is rotated with a length direction thereof being a rotation axis.

2. The manufacturing method according to claim 1 , wherein the coating liquid for insulating layer formation has a viscosity of 1 dPa·s or more.

3. The manufacturing method according to claim 1 ,
wherein the forming a coating film is performed using a nozzle configured to jet the coating liquid for insulating layer formation, and
wherein the spraying a coating liquid for insulating layer formation is performed by moving the nozzle in the tubular main body.

4. The manufacturing method according to claim 3 , wherein the spraying is performed by repeating, a plurality of times, movement of the nozzle from a first end portion of the tubular main body to a second end portion thereof, and movement of the nozzle from the second end portion of the tubular main body to the first end portion thereof.

5. The manufacturing method according to claim 1 , wherein the insulating layer has a thickness of 30 μm or more.

6. A method of manufacturing a tubular member for an exhaust gas treatment device, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass,
the method comprising steps of:
forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and
firing the coating film to obtain the insulating layer,
wherein the spraying is performed for the tubular main body subjected to heating at a heating temperature of 50° C. to 120° C.

7. The manufacturing method according to claim 6 , wherein the heating of the tubular main body is performed at a timing selected from: during the spraying; before the spraying; after the spraying; or a combination thereof.

8. The manufacturing method according to claim 6 , wherein the coating liquid for insulating layer formation has a viscosity of 1 dPa·s or more.

9. The manufacturing method according to claim 6 ,
wherein the forming a coating film is performed using a nozzle configured to jet the coating liquid for insulating layer formation, and
wherein the spraying a coating liquid for insulating layer formation is performed by moving the nozzle in the tubular main body.

10. The manufacturing method according to claim 9 , wherein the spraying is performed by repeating, a plurality of times, movement of the nozzle from a first end portion of the tubular main body to a second end portion thereof, and movement of the nozzle from the second end portion of the tubular main body to the first end portion thereof.

11. The manufacturing method according to claim 6 , wherein the insulating layer has a thickness of 30 μm or more.

Assignees

• Ngk Insulators Ltd

Inventors

• Fujimura Ryo
• Kato Kodai
• Nishio Akifumi

Classifications

• C23D5/005 Primary

  by a method specially adapted for coating special objects · CPC title

• B05B13/0654

  and a treating nozzles being translated through the hollow bodies in a direction essentially parallel to the rotational axis (B05B13/0681 takes precedence) · CPC title

• B05B16/20

  Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations · CPC title

• F01N3/2828

  Ceramic multi-channel monoliths, e.g. honeycombs · CPC title

• F01N13/148

  Multiple layers of insulating material · CPC title