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A high-temperature anti-oxidation coating for tungsten-rhenium thermocouple and its application

An anti-oxidation coating, thermocouple technology, applied in the direction of coating, thermometer with directly sensitive electrical/magnetic components, metal material coating process, etc., can solve the use limitation, thermocouple armor volume and weight Increase, no actual use of the product and other problems, to achieve the effect of fast temperature response, long anti-oxidation time, and increased adhesion

Active Publication Date: 2019-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) The operating temperature of the thermocouple is limited by the temperature resistance of the protective tube, usually lower than 1800°C;
[0010] (2) After the thermocouple is armored and protected, the volume and weight increase, and the use in systems with strict volume requirements is limited;
[0011] (3) After the casing and filling material are used for protection, the response speed of the thermocouple is greatly affected
In fact, research in this area at home and abroad has been carried out since the 1960s, but there has been no continuous public report, and no related products have been put into practical use worldwide.

Method used

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  • A high-temperature anti-oxidation coating for tungsten-rhenium thermocouple and its application
  • A high-temperature anti-oxidation coating for tungsten-rhenium thermocouple and its application
  • A high-temperature anti-oxidation coating for tungsten-rhenium thermocouple and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A high-temperature oxidation-resistant coating structure for a tungsten-rhenium thermocouple, including a transition layer and an oxygen barrier layer. There is a TaC transition layer with a thickness of about 20 μm between the oxygen barrier material and the tungsten-rhenium thermocouple substrate, that is, the surface of the tungsten-rhenium thermocouple wire with a diameter of about 0.5 mm, such as figure 1 As shown, the oxygen barrier layer has seven layers in total, the first layer is HfC-10%ZrC material, the coefficient of thermal expansion is 6×10 -6 K -1 , the thickness is 20μm; the second layer is HfC-30%ZrC material, the thickness is 20μm; the third layer is HfC-50%ZrC, the thickness is 20μm; the fourth layer is ZrC, the thermal expansion coefficient is 7.3×10 -6 K -1 , a thickness of 20 μm; the fifth layer is ZrC-10% ZrO2, a thickness of 20 μm; the sixth layer is ZrC-30ZrO2, a thickness of 20 μm; the seventh layer is ZrC-50ZrO2, a thickness of 20 μm. The t...

Embodiment 2

[0066]A high-temperature oxidation-resistant coating structure for a tungsten-rhenium thermocouple, including a transition layer and an oxygen barrier layer. There is a Ta transition layer with a thickness of about 15 μm between the oxygen barrier material and the tungsten-rhenium thermocouple substrate, that is, the surface of the tungsten-rhenium thermocouple wire with a diameter of about 0.5 mm. The oxygen barrier layer has six layers in total, the first layer is made of SiC material with a thermal expansion coefficient of 4.5×10 -6 K -1 , the thickness is 20μm; the second layer is SiC-20%HfC material, the thickness is 20μm; the third layer is SiC-40%HfC, the thickness is 20μm; the fourth layer is SiC-60%HfC, the thickness is 20μm; The layer is SiC-80%HfC with a thickness of 20μm; the sixth layer is HfC with a thermal expansion coefficient of 6.7×10 -6 K -1 , with a thickness of 20 μm. The total thickness of the oxygen barrier material of the multilayer structure is 120...

Embodiment 3

[0073] A high-temperature oxidation-resistant coating structure for a tungsten-rhenium thermocouple, including a transition layer and an oxygen barrier layer. There is a WSi2 transition layer with a thickness of about 20 μm between the oxygen barrier material and the tungsten-rhenium thermocouple substrate, that is, the surface of the tungsten-rhenium thermocouple wire with a diameter of about 0.5 mm. The oxygen barrier layer has eleven layers in total, the first layer is made of HfO2 material with a thermal expansion coefficient of 4.3×10 -6 K -1 , a thickness of 20 μm; the second layer is HfO2-10% YSZ (yttrium stabilized zirconia, molar ratio Y:Zr=6:100) material, a thickness of 20 μm; the third layer is HfO2-20% YSZ, a thickness of 20 μm; The fourth layer is HfO2-30%YSZ, the thickness is 20μm; the fifth layer is HfO2-40%YSZ, the thickness is 20μm; the sixth layer is HfO2-50%YSZ, the thickness is 20μm; the seventh layer is HfO2-60% YSZ, the thickness is 20 μm; the eighth l...

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Abstract

The invention belongs to the technical field of temperature measurement, and relates to a high-temperature oxidation-resistant coating for a tungsten-rhenium thermocouple and an application thereof. The anti-oxidation coating is directly arranged on the tungsten-rhenium thermocouple substrate, including a transition layer directly located on the surface of the tungsten-rhenium thermocouple substrate and an oxygen barrier material located on the surface of the transition layer. The thermal expansion coefficient of the transition layer material is between that of the tungsten Between the rhenium thermocouple base material and the material selected for the oxygen barrier material, the coating can continue to resist oxidation for more than 30 minutes in an aerobic environment higher than 2000 °C without falling off, and has excellent oxidation resistance. Problems with prolonged contact temperature measurement in high temperature aerobic environments.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and more specifically relates to a high-temperature oxidation-resistant coating for a tungsten-rhenium thermocouple and an application thereof. Background technique [0002] For the measurement of ultra-high temperatures above 1600 °C, non-contact (infrared, optical, etc.) methods are currently used for measurement, but the non-contact method not only has a slow response speed, but also has a temperature measurement accuracy far inferior to direct contact temperature measurement using thermocouples. Platinum-rhodium (Pt-Rh) thermocouple, nickel-chromium-nickel-silicon thermocouple, iron-constantan thermocouple and tungsten-rhenium (W-Re) thermocouple are relatively common high-temperature thermocouples, among which tungsten-rhenium thermocouple and Compared with other thermocouples, it has obvious advantages: [0003] (1) High melting point (>3000°C), high strength, good therm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04G01K7/02
CPCG01K7/02C23C28/04C23C28/042C23C28/048
Inventor 陈实邱新潮徐健博张博文杨晓非
Owner HUAZHONG UNIV OF SCI & TECH
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