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Oxygen barrier material in tungsten-rhenium thermocouple anti-oxidation coating structure, and application thereof

A technology of anti-oxidation coating and barrier material, applied in coatings, thermoelectric devices, metal material coating processes, etc., can solve the problems of use restrictions, no actual use of products, increase in volume and weight of thermocouple armor, etc. Achieve anti-oxidation ability guarantee, good stress dispersion, ensure the effect of stress dispersion

Inactive Publication Date: 2018-05-29
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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  • Oxygen barrier material in tungsten-rhenium thermocouple anti-oxidation coating structure, and application thereof
  • Oxygen barrier material in tungsten-rhenium thermocouple anti-oxidation coating structure, and application thereof
  • Oxygen barrier material in tungsten-rhenium thermocouple anti-oxidation coating structure, and application thereof

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preparation example Construction

[0044] The preparation method of the oxygen barrier material of the above-mentioned tungsten-rhenium thermocouple anti-oxidation coating structure comprises the following steps:

[0045] (1) Select the absolute value of the difference between the thermal expansion coefficient and the thermal expansion coefficient of the tungsten-rhenium thermocouple substrate to be no more than 6×10 -6 K -1 The material or mixture of materials is used as an oxygen barrier material, and the first layer of oxygen barrier material is prepared on the surface of the tungsten-rhenium thermocouple substrate by chemical vapor deposition, thermal spraying or sol-gel method;

[0046] (2) Change the material type of each layer in turn, or do not change the material type, and gradually adjust the concentration ratio of different materials in each layer, and deposit layer by layer in the direction away from the tungsten-rhenium thermocouple substrate according to the same method as step (1). , so that the...

Embodiment 1

[0050] An oxygen barrier material in a tungsten-rhenium thermocouple high-temperature oxidation-resistant coating structure, the oxygen barrier material is directly set on the tungsten-rhenium thermocouple substrate, that is, the surface of the tungsten-rhenium thermocouple wire with a diameter of about 0.5mm, that is, the oxygen barrier material is Antioxidant coatings for the tungsten-rhenium thermocouple, such as figure 1 As shown, the anti-oxidation coating has five layers in total, the first layer is made of ZrB2 material, and the coefficient of thermal expansion is 6.5×10 -6 K -1 , the thickness is 10 μm; the second layer is ZrB2-5% SiC material, the thickness is 10 μm; the third layer is ZrB2-10% SiC, the thickness is 10 μm; the fourth layer is ZrB2-15% SiC, the thickness is 10 μm; the fifth The layer is ZrB2-20% SiC, the coefficient of thermal expansion is 9×10 -6 K -1 , with a thickness of 10 μm. The total thickness of the oxygen barrier material of the multilayer...

Embodiment 2

[0055] An oxygen barrier material in a tungsten-rhenium thermocouple high-temperature oxidation-resistant coating structure, the oxygen barrier material is directly set on the tungsten-rhenium thermocouple substrate, that is, the surface of the tungsten-rhenium thermocouple wire with a diameter of about 0.5mm, that is, the oxygen barrier material is It is the anti-oxidation coating of the tungsten-rhenium thermocouple. The anti-oxidation coating has six layers in total. The first layer is 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 st...

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Abstract

The invention belongs to the technical field of temperature measurement, and relates to an oxygen barrier material in a tungsten-rhenium thermocouple anti-oxidation coating structure, and applicationof the oxygen barrier material. The oxygen barrier material is of a multilayer structure with a total thickness of 50-200 mu m. The oxygen barrier material in the multilayer structure has compositional gradients and concentration gradients, ie, thermal expansion coefficients of materials in layers of the oxygen barrier material are gradually increased in a direction away from a tungsten-rhenium thermocouple base body, and oxygen erosion resistance of the materials in layers of the oxygen barrier material is gradually increased in a direction away from the tungsten-rhenium thermocouple base body through adjusting types or proportions of the materials in each layer, thereby increasing the adhesive force of a high-temperature anti-oxidation coating of a tungsten-rhenium thermocouple, and reducing stress of the high-temperature anti-oxidation coating of the tungsten-rhenium thermocouple.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and more specifically relates to an oxygen barrier material in a tungsten-rhenium thermocouple high-temperature anti-oxidation coating structure and its application. 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), hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L37/00C23C4/10C23C4/11C23C16/34C23C16/38C23C16/40C23C18/12H10N15/00
CPCC23C4/10C23C4/11C23C16/34C23C16/38C23C16/405C23C18/1204C23C18/1216C23C18/1254H10N15/00
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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