Densification method for high-temperature antioxidant coating of tungsten-rhenium thermocouple

An anti-oxidation coating and thermocouple technology, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the temperature resistance limit of thermocouple temperature protection tube, thermocouple armor volume and Increased weight, no persistent public reports, etc., to achieve obvious blocking effect, reduced thermal stress, and less micro-cracks

Active Publication Date: 2018-05-15
HUAZHONG UNIV OF SCI & TECH
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  • 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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  • Densification method for high-temperature antioxidant coating of tungsten-rhenium thermocouple

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Experimental program
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Effect test

Embodiment 1

[0069] 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 , the thickness is 20μm; the fifth layer is ZrC-10%ZrO2, the thickness is 20μm; the sixth layer is ZrC-30ZrO 2 , the thickness is 20μm; the seventh layer is ZrC-50ZrO 2 , with a thickness of ...

Embodiment 2

[0078] 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 12...

Embodiment 3

[0087] 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 HfO 2 -30% YSZ with a thickness of 20μm; the fifth layer is HfO 2 -40%YSZ, thickness 20μm; sixth layer is HfO2-50%YSZ, thickness 20μm; seventh layer is HfO 2 -60% YSZ with a thickness of 20μm; the eighth layer is Hf...

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Abstract

The invention belongs to the technical field of temperature measurement, and particularly relates to a densification method for an antioxidant coating of a tungsten-rhenium thermocouple. According tothe densification method, the antioxidant coating of the tungsten-rhenium thermocouple is attached to the surface of a substrate of the tungsten-rhenium thermocouple, and comprises a transition layerand an oxygen barrier layer located on the surface of the transition layer, and the thermal expansion coefficient of the material of the transition layer is between the material of the substrate of the tungsten-rhenium thermocouple and the material selected by the oxygen barrier layer; isostatic pressing and heat treatment are carried out on the antioxidant coating of the tungsten-rhenium thermocouple, so that the antioxidant coating is more compact, micro-cracks are less, and the porosity is lower; meanwhile, the thermal stress is released, so that the thickness of the antioxidant coating ofthe tungsten-rhenium thermocouple is reduced by more than 40%; and the oxygen-resistant ablation resistance of the coating in an aerobic environment above 2000 DEG C is remarkably enhanced, so that the problem of long-time contact type temperature measurement in an ultra-high-temperature aerobic environment above 2000 DEG C is solved.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and more specifically relates to a densification method of an oxidation-resistant coating of a tungsten-rhenium thermocouple. 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 thermal shock resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C23C4/134C23C4/10C23C4/18C23C16/32C23C16/56C23C28/04
CPCC23C4/10C23C4/134C23C4/18C23C16/32C23C16/56C23C24/082C23C28/04
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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