High-temperature temperature sensor based on surface-modified tungsten-rhenium thermocouple

A temperature sensor and surface modification technology, used in thermometers, thermometers, instruments, etc., which are directly sensitive to heat-sensitive electrical/magnetic components, can solve the problem of lack of temperature measurement methods, and achieve guaranteed accuracy, high temperature resistance, The effect of small comprehensive temperature measurement error

Active Publication Date: 2011-06-15
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

Because the temperature is too high, and the airflow is mostly an oxidizing environment, there is a lack of effective and accurate temperature measurement means

Method used

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  • High-temperature temperature sensor based on surface-modified tungsten-rhenium thermocouple

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Embodiment Construction

[0014] The high-temperature temperature sensor of the present invention includes a protective sleeve 1, an insulating porcelain tube 2 and a tungsten-rhenium thermocouple 3, and the surface of the tungsten-rhenium thermocouple 3 is coated with a high-temperature-resistant ceramic material; the insulating porcelain tube 2 is made of magnesium oxide material ; The protection sleeve 1 adopts metal tungsten, metal molybdenum, tungsten-lanthanum alloy or high-temperature alloy heating barrier coating, and the structure of the protection sleeve 1 adopts a single-shielding stagnation type or a single-shielding direct blowing type.

[0015] Described tungsten-rhenium thermocouple 3, the substrate material of surface coating is metal Zr, and the main component of coating material is ZrO 2 , mixed with an appropriate amount of Y 2 o 3 , as a phase stabilizer, the thickness of the film layer does not exceed 10μm, and the color of the even wire after coating is gray or blue. The length ...

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Abstract

The invention belongs to a temperature sensor for high temperature measurement, and relates to a high-temperature temperature sensor based on a surface-modified tungsten-rhenium thermocouple for short-time temperature measurement below 2600 K. In the invention, a composite ceramic material is used as the protection film of the tungsten-rhenium thermocouple to prevent the change in the thermoelectric characteristics of the tungsten-rhenium thermocouple due to the erosion of oxidative gas. Through the film coating treatment, a composite high-temperature-resistant and anti-oxidant ceramic material grows on the surface of the tungsten-rhenium thermocouple to ensure the normal use of the thermocouple wire. Meanwhile, a special protection sleeve material is used to ensure a less comprehensive temperature measurement error during the temperature measurement of high-temperature air flow through theoretical analysis and numerical calculation. Therefore, the high-temperature temperature sensor is applicable to the high-temperature air flow environment and can keep the enough thermal strength to ensure the temperature measurement accuracy with the aid of a proper structure. In addition, the high-temperature temperature sensor has the advantages of high temperature resistance, high oxidation resistance, quick response and the like.

Description

technical field [0001] The invention belongs to a temperature sensor for high-temperature measurement, and relates to a high-temperature temperature sensor based on a surface-modified tungsten-rhenium thermocouple suitable for short-term temperature measurement below 2600K. Background technique [0002] At present, the sensors used to measure the temperature of high-temperature air flow generally use platinum-rhodium series thermocouples, and the maximum temperature that can be measured is 2000K. At present, in the fields of aviation, aerospace, and nuclear industries, the measurement temperature involved is getting higher and higher. The airflow temperature of some engines has reached 2600K. Because the temperature is too high, and the airflow is mostly oxidative environment, there is a lack of effective and accurate temperature measurement means. Contents of the invention [0003] The purpose of the present invention is to propose a high-temperature temperature sensor b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/04
Inventor 赵俭杨永军王毅荆卓寅王鹏
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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