Method for improving stability of resistance value of thermistor in vacuum environment

A thermistor and vacuum environment technology, applied in the direction of resistors with negative temperature coefficient, resistors with positive temperature coefficient, etc., can solve the problem of unstable resistance value, achieve good resistance value stability, and facilitate temperature control , the effect of small resistance change

Inactive Publication Date: 2015-01-21
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

Ordinary thermistors work in an atmospheric environment. In a vacuum environment, due to changes in heat dissipation methods (convection, conduction, and radiation heat dissipation in the atmosphere, only radiation heat dissipation in a vacuum), the volatilization of the residual gas in the thermistor will cause It affects the temperature of the thermistor, and the volatilization of residual gas is an irreversible process, and the volatilized gas will not be absorbed again. As the speed of volatilization of gas inside the resistor changes, the resistance value changes synchronously, resulting in instability of resistance value

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  • Method for improving stability of resistance value of thermistor in vacuum environment
  • Method for improving stability of resistance value of thermistor in vacuum environment
  • Method for improving stability of resistance value of thermistor in vacuum environment

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Embodiment Construction

[0016] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0017] The invention provides a method for improving the resistance stability of a thermistor in a vacuum environment. The gas remaining in the resistor is removed through high-temperature baking and degassing, and the resistance value change caused by the temperature change caused by gas volatilization is reduced. , thereby improving the stability of the thermistor.

[0018] The thermistor is sintered with ceramic material, and the residual gas inside mainly contains N 2 、H 2 O, low molecular weight hydrocarbons, etc. During high-temperature vacuum baking, the outgassing peaks of these residual gases all appear before 400°C. In order to ensure the removal of residual gases without destroying the microstructure of the thermistor, the temperature selected for this process is 450°C. In the test, it is found that the holding time reaches 36h, which can mee...

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Abstract

The invention discloses a method for improving the stability of the resistance value of a thermistor in the vacuum environment. After the method is adopted, the stability of the resistance value of the thermistor can be improved in the vacuum environment. The method comprises the steps of firstly, building a high-temperature degassing system, and then removing the gas left in the resistor by high-temperature baking degassing in the high-temperature degassing system to reduce the change of the resistance value due to the temperature change caused by gas volatilization; therefore, the stability of the thermistor is improved.

Description

technical field [0001] The invention relates to the technical field of thermistors, in particular to a method for improving the resistance stability of thermistors in a vacuum environment. Background technique [0002] Equipment working in ultra-high vacuum environments, such as some satellite payloads, need to use thermistors for temperature control. Ordinary thermistors work in an atmospheric environment. In a vacuum environment, due to changes in heat dissipation methods (convection, conduction, and radiation heat dissipation in the atmosphere, only radiation heat dissipation in a vacuum), the volatilization of the residual gas in the thermistor will cause It affects the temperature of the thermistor, and the volatilization of residual gas is an irreversible process, and the volatilized gas will not be absorbed again. As the volatilization speed of the gas inside the resistor changes, the resistance value changes synchronously, resulting in instability of the resistance v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C7/04
Inventor 郑宁陈江王骥朱宏伟成大鹏马寅光黄良育袁征难高玮
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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