Title:
熱電対保護用二層保護管の外管および工業炉
Document Type and Number:
Japanese Patent JP6786078
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an outer tube of a double layer protection tube for protecting a thermocouple, the outer tube being capable of being used stably even under the presence of corrosive gas such as methane, ethane, ethylene and carbon monoxide in the hydrogen reduction atmosphere and also in the high-temperature furnace atmosphere.SOLUTION: In a structure of protecting a thermocouple 3 used for an industrial furnace with a double layer protection tube 5 comprising an inner protection tube 2 and an outer protection tube 1, a recrystallized silicon carbide protection tube or a reaction-sintered silicon carbide protection tube is used as the outer protection tube 1. On the outer surface of the outer tube 1, a coating film is formed by applying an aqueous solution of a coating agent and baking the same. The coating agent includes, as raw material, a combination of one kind or two or more kinds selected from a first group and one kind or two or more kinds selected from a second group, as shown below (excluding a combination that uses sodium oxide in the second group alone). The first group includes molybdenum silicide, iron silicide, silicon nitride, aluminum hydroxide, alumina, calcia and silicon; and the second group includes borosilicate glass, colloidal silica, frit glass and sodium oxide.SELECTED DRAWING: Figure 4
Inventors:
Akira Ogawa
Naoyuki Yonehisa
Naoyuki Yonehisa
Application Number:
JP2015211520A
Publication Date:
November 18, 2020
Filing Date:
October 28, 2015
Export Citation:
Assignee:
Tokai High Temperature Industry Co., Ltd.
International Classes:
G01K1/08; F27D21/00
Domestic Patent References:
| JP62170656U | ||||
| JP1288740A | ||||
| JP10197352A |
Attorney, Agent or Firm:
Patent Business Corporation Ashitaba International Patent Office
Kenji Akatsuka
Kenji Akatsuka