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A kind of platinum-rhodium thermocouple anti-carbon composite coating material and preparation method thereof

A technology of coating materials and thermocouples, which is applied in the direction of coating, metal material coating process, and thermometers with electric/magnetic elements that are directly sensitive to heat, can solve the problem that the long-term use of thermocouples and the temperature of thermocouples cannot be guaranteed Slow response speed, poor adhesion, etc., to achieve the effect of increasing thickness, improving carbon resistance, and increasing working temperature

Active Publication Date: 2019-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the above defects or improvement needs of the prior art, the present invention provides a platinum-rhodium thermocouple anti-carbon composite coating material and a preparation method thereof, thereby solving the problem of slow thermocouple temperature response, poor adhesion, There is no guarantee that the thermocouple will be used for a long time in a reducing environment with C, and the technical problem that it is easily reduced and invalidated in a reducing atmosphere

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  • A kind of platinum-rhodium thermocouple anti-carbon composite coating material and preparation method thereof
  • A kind of platinum-rhodium thermocouple anti-carbon composite coating material and preparation method thereof

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preparation example Construction

[0035] Such as figure 2 Shown, a kind of preparation method of platinum-rhodium thermocouple anti-carbon composite coating material comprises:

[0036] (1) After the platinum-rhodium thermocouple is treated at a high temperature of 200°C-500°C for 0.5h-5h, it is then ultrasonically cleaned by sodium hydroxide solution, sulfuric acid, ethanol, and deionized water. The cleaning time of each solution is 10min-20min. To 0.25mol / L Y(NO 3 ) 3 Dilute hydrochloric acid is added to the aqueous solution to obtain the first mixed solution, so that the pH of the first mixed solution is 3, and then triethanolamine solution is added to the first mixed solution to obtain the second mixed solution. The triethanolamine solution is deionized water and ≥99.9% Triethanolamine obtained by mixing uniformly according to the volume ratio of 10:1. Make the PH of the second mixed solution 6 to obtain the third mixed solution, stir the third mixed solution evenly and put it in a constant temperature...

Embodiment 1

[0040] A preparation method of a platinum-rhodium thermocouple anti-carbon composite coating material, comprising:

[0041] (1) After the platinum-rhodium thermocouple was treated at 200°C for 5 hours, it was ultrasonically cleaned by sodium hydroxide solution, sulfuric acid, ethanol, and deionized water in sequence, and the cleaning time of each solution was 10 minutes. To Y (NO 3 ) 3 Dilute hydrochloric acid is added to the aqueous solution to obtain the first mixed solution, so that the pH of the first mixed solution is 3, and then triethanolamine solution is added to the first mixed solution to obtain the second mixed solution. The triethanolamine solution is deionized water and ≥99.9% Triethanolamine obtained by mixing uniformly according to the volume ratio of 10:1. Make the pH of the second mixed solution be 6 to obtain the third mixed solution, stir the third mixed solution evenly and put it in a thermostat at 20°C for 72 hours to obtain Y 2 o 3 Sol-gel. to Y 2 o...

Embodiment 2

[0044] A preparation method of a platinum-rhodium thermocouple anti-carbon composite coating material, comprising:

[0045] (1) After treating the platinum-rhodium thermocouple at a high temperature of 500°C for 0.5h, it is then ultrasonically cleaned by sodium hydroxide solution, sulfuric acid, ethanol, and deionized water, and the cleaning time of each solution is 20min. To Y (NO 3 ) 3 Dilute hydrochloric acid is added to the aqueous solution to obtain the first mixed solution, so that the pH of the first mixed solution is 3, and then triethanolamine solution is added to the first mixed solution to obtain the second mixed solution. The triethanolamine solution is deionized water and ≥99.9% Triethanolamine obtained by mixing uniformly according to the volume ratio of 10:1. Make the pH of the second mixed solution be 6 to obtain the third mixed solution, stir the third mixed solution evenly and put it in a thermostat at 30°C for 48 hours to obtain Y 2 o 3 Sol-gel. to Y 2...

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Abstract

The invention discloses a platinum-rhodium thermocouple anti-carbon composite coating material and a preparation method thereof, which belong to the technical field of inorganic functional coating materials. The platinum-rhodium thermocouple anti-carbon composite coating material comprises alternately placed first coating film materials and The second coating material, the first coating material is Y 2 o 3 The mass fraction of 20%‑30% Y was added to the sol-gel 2 o 3 The mixture obtained from ultrafine powder, the second coating film material is to Y 2 o 3 A mixture obtained by adding TaC ultrafine powder with a mass fraction of 20%-30% in sol-gel, Y 2 o 3 The diameter of the ultrafine powder is 40nm-60nm, the diameter of the TaC ultrafine powder is 40nm-60nm, and the thickness of the platinum-rhodium thermocouple anti-carbon composite coating material is 30μm-50μm. The platinum-rhodium thermocouple anti-carbon composite coating material prepared by the invention has fast temperature response speed, good adhesion, and can be used for a long time in reducing environment.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional coating materials, and more specifically relates to a platinum-rhodium thermocouple anti-carbon composite coating material and a preparation method thereof. Background technique [0002] Temperature sensors are widely used in modern measurement technology. Platinum rhodium (Pt-Rh) thermocouple is a traditional high temperature sensor element, also called high temperature noble metal sensor. As a temperature measurement sensor, it is usually used together with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control fluids, steam and gases within the range of 0-1800°C in various production processes. Medium and solid surface temperature, the long-term use temperature is 1600°C. Platinum-rhodium (Pt-Rh) thermocouple has the advantages of the highest accuracy, best stability, wide temperature measurement range, long ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/02C23C18/12
CPCG01K7/02C23C18/1204C23C18/1216C23C18/1225
Inventor 陈实牛贺莹邱新潮张博文徐健博杨晓非
Owner HUAZHONG UNIV OF SCI & TECH