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Method for coating precious metal thermocouple wire with high-temperature-resistant coating

A thermocouple wire, precious metal technology, applied in metal material coating process, coating, thermometers with directly sensitive electrical/magnetic components, etc., can solve thermoelectric signal offset, large workload, oxidation volatilization, etc problems, to achieve the effect of ensuring temperature measurement accuracy, increasing service life, and preventing volatilization loss

Pending Publication Date: 2022-04-15
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Precious metal thermocouples have the advantages of high temperature measurement accuracy, good stability, wide temperature measurement area, and long service life. They are widely used in steel, metallurgy, petrochemical, glass fiber, aviation and other fields. Reduced strength in the environment, sensitive to environmental pollution, such as with H 2 , CO, etc. react to make temperature measurement inaccurate or reduce service life; when noble metal thermocouples are used for a long time in a high-temperature oxidizing environment at 1200 ° C ~ 2100 ° C, some alloy components in the thermocouple wire are easy to oxidize and volatilize, resulting in Thermoelectric signal offset
[0003] In order to prevent the thermocouple from being polluted and corroded by special gases and impurities in the air or at high temperature, the common method is to armor the precious metal thermocouple. This method is not only cumbersome in the assembly process, but also has a large workload, and requires a greater degree of meticulousness of the assembly staff.
According to different use environments, the requirements for armor materials are also different, which brings a lot of inconvenience to assembly, and the current commercial precious metal armor thermocouples are still difficult to meet the temperature measurement needs of some special temperature fields

Method used

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  • Method for coating precious metal thermocouple wire with high-temperature-resistant coating
  • Method for coating precious metal thermocouple wire with high-temperature-resistant coating
  • Method for coating precious metal thermocouple wire with high-temperature-resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put the platinum-rhodium 10-platinum thermocouple wire with a diameter of 0.5mm into 10%wt NaOH solution and boil for 20min, then place it in a hydrochloric acid solution with a concentration of 35%wt and boil for 20min, take it out and wash it several times with distilled water, Until the acid and alkali are cleaned. Place the cleaned silk in a blast drying oven and dry at 85°C for 15 minutes to completely dry the silk. Put the clean and dry wire into the sandblasting machine, use 60-mesh corundum sand, and the sandblasting pressure is 2.5kgf, to blast the surface of the wire to make the surface of the wire evenly roughened, and then use a fan to remove the surface of the wire Attached sand particles, to avoid the attached sand particles affecting the bond strength of the coating. The roughened wire was subjected to plasma spraying treatment, and the platinum-rhodium 10 wire and the platinum wire were respectively clamped on a tooling fixture with an automatic rotatio...

Embodiment 2

[0039] Put the platinum-rhodium 10-platinum thermocouple wire with a diameter of 0.9mm into 10%wt NaOH solution and boil for 20min, then place it in a hydrochloric acid solution with a concentration of 35%wt and boil for 20min, take it out and wash it several times with distilled water, Until the acid and alkali are cleaned. Place the cleaned silk in a blast drying oven and dry at 85°C for 15 minutes to completely dry the silk. Put the clean and dry wire into the sandblasting machine, use 60-mesh corundum sand, and the sandblasting pressure is 3kgf, to blast the surface of the wire to make the surface of the wire evenly roughened, and then use a fan to blow off the surface of the wire Attached sand particles, to avoid the attached sand particles affecting the bond strength of the coating. The roughened wire was subjected to plasma spraying treatment, and the platinum-rhodium 10 wire and the platinum wire were respectively clamped on a fixture with automatic rotation function,...

Embodiment 3

[0044] Put the iridium-rhodium 40-iridium thermocouple wire with a diameter of 0.9mm into 20%wt NaOH solution and boil for 20min, then place it in a hydrochloric acid solution with a concentration of 40%wt and boil for 20min, take it out and wash it several times with distilled water, Until the acid and alkali are cleaned. Place the cleaned silk in a blast drying oven and dry at 85°C for 15 minutes to completely dry the silk. Put the clean and dry wire into the sandblasting machine, use 60-mesh corundum sand, and the sandblasting pressure is 3kgf, to blast the surface of the wire to make the surface of the wire evenly roughened, and then use a fan to blow off the surface of the wire Attached sand particles, to avoid the attached sand particles affecting the bond strength of the coating. The roughened wire was subjected to plasma spraying treatment, and the iridium-rhodium 40 wire and the iridium wire were respectively clamped on a fixture with automatic rotation function, and...

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Abstract

The invention relates to a method for coating a high-temperature-resistant coating on a precious metal thermocouple wire, which is characterized in that a compact protective layer is formed on the surface of a precious metal bare wire, so that the precious metal is prevented from being in contact with environmental atmosphere and impurities, the volatilization loss of the precious metal is reduced, and a precious metal thermocouple is well isolated; the precision and the service life of the temperature measurement of the precious metal thermocouple are guaranteed, the armoring process for protecting the thermocouple is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to a method for coating a high temperature resistant coating on a precious metal thermocouple wire. Background technique [0002] Precious metal thermocouples have the advantages of high temperature measurement accuracy, good stability, wide temperature measurement area, and long service life. They are widely used in steel, metallurgy, petrochemical, glass fiber, aviation and other fields. Reduced strength in the environment, sensitive to environmental pollution, such as with H 2 , CO, etc. react to make temperature measurement inaccurate or reduce service life; when noble metal thermocouples are used for a long time in a high-temperature oxidizing environment of 1200 ° C ~ 2100 ° C, some alloy components in the thermocouple wire are easy to oxidize and volatilize, resulting in Thermoelectric signal offset. [0003] In order to prevent the thermocouple from being polluted and corroded by special gases and impurities in the air o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/134C23C4/02G01K1/12G01K7/02
Inventor 李凤唐会毅肖雨辰吴保安杨开舟郑雅文孙玲郑磊
Owner CHONGQING MATERIALS RES INST
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