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Corrosion-resistant film for measuring temperature or electrically heating and crucible element thereof

A corrosion-resistant, electric heating technology, used in heating element materials, thermometers using directly heat-sensitive electrical/magnetic elements, measuring heat, etc. It can improve the corrosion resistance, be easy to batch, and have a wide measurement temperature range.

Inactive Publication Date: 2010-08-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-temperature acid, alkali liquid and high-temperature molten salt are highly corrosive, and an oxide protective sheath is usually required when using a thermocouple to measure temperature, which causes the thermocouple to be in a non-contact state with the liquid or molten salt, and the reflected temperature is obtained through protection The set of heat conduction is obtained, which will lead to a lag in the response to the temperature of the measured object
It is also possible to use an infrared thermometer to obtain the temperature by detecting the radiated infrared rays of high-temperature corrosive liquids or molten salts, but this method is also non-contact temperature measurement and is susceptible to thermal disturbances of their volatiles
In addition, the infrared thermometer mainly reflects the surface temperature of the measured object, and cannot obtain a more accurate internal temperature.

Method used

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  • Corrosion-resistant film for measuring temperature or electrically heating and crucible element thereof
  • Corrosion-resistant film for measuring temperature or electrically heating and crucible element thereof
  • Corrosion-resistant film for measuring temperature or electrically heating and crucible element thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A corrosion-resistant film for temperature measurement or electric heating, composed of 99% by weight La 1-x Sr x MnO 3 (x=0.2) and 1% La 1-y A y CrO 3 (y=0.01, A=Ca) composition.

[0035] The preparation method of the above-mentioned corrosion-resistant film for temperature measurement or electric heating comprises the following steps:

[0036] 1). Preparation of La 0.8 Sr 0.2 MnO 3 Sol, according to the molar ratio La:Sr:Mn=0.8:0.2:1, mix and dissolve lanthanum nitrate, strontium nitrate, and manganese nitrate in deionized water to make a solution, then add the prepared citric acid and ethylene glycol solution, and stir Make a sol and continue to stir for 0.5 hours to get La 0.8 Sr 0.2 MnO 3 Sol. Wherein the molar ratio of metal cation and citric acid is 1:0.8, and the molar ratio of citric acid and ethylene glycol is 1:6;

[0037] 2). Preparation of La 0.8Sr 0.2 MnO 3 Gel, the sol prepared in step 1) was heated and stirred at 90°C until viscous, and t...

Embodiment 2

[0045] A corrosion-resistant film for temperature measurement or electric heating, composed of 97% La 1-x Sr x MnO 3 (x=0.5) and 3% La 1-y A y CrO 3 (y=0.2, A=Sr) composition.

[0046] The preparation method of the above-mentioned corrosion-resistant film for temperature measurement or electric heating comprises the following steps:

[0047] 1). Preparation of La 0.5 Sr 0.5 MnO 3 Sol, according to the molar ratio La:Sr:Mn=0.5:0.5:1, mix and dissolve lanthanum nitrate, strontium nitrate, and manganese nitrate in deionized water to make a solution, then add the prepared citric acid and ethylene glycol solution, and stir A sol was made and stirring was continued for 3 hours to obtain La 0.5 Sr 0.5 MnO 3 Sol. Wherein the molar ratio of metal cation and citric acid is 1: 3, and the molar ratio of citric acid and ethylene glycol is 1: 2;

[0048] 2). Preparation of La 0.5 Sr 0.5 MnO 3 Gel, the sol prepared in step 1) was heated and stirred at 60°C until viscous, and ...

Embodiment 3

[0055] High-temperature resistance change test: the method is to use a special fixture to connect the electrode of the thin film element on the outer wall of the crucible to the wire, and then put the sample together with the fixture into a box-shaped resistance furnace for heating. The heating rate is 4°C / min, and the heating temperature range is Room temperature to 800°C. The wire outside the furnace was connected to a multimeter, and the resistance data of the thin film element was recorded every 5°C, and finally the resistance change of the sample heated from room temperature to 800°C in the air atmosphere was obtained. Image 6 The resistance change of the film element on the outer wall of the crucible in the range of room temperature to 800 ℃ is given. from Image 6 It can be seen from the figure that the resistance of the element shows obvious negative temperature thermistor effect with the change of temperature, which has the potential to be developed into a thermosen...

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Abstract

The invention relates to a corrosion-resistant film for measuring temperature or electrically heating and a crucible element thereof. The film consists of the following components in percent by weight: 99.9 to 95.1 percent of polycrystalline La1-xSrxMnO3 (x is equal to 0 to 0.6) and 0.1 to 4.9 percent of La1-yAyCrO3, (y is equal to 0 to 0.6 and A is Ca, Sr or Mg). The film is prepared by a sol-gel and silk screen printing method and forms an element together with crucible and an electrode. A small amount of La1-yAyCrO3 is added into the La1-xSrxMnO3 to further enhance the corrosion resistance of the film; in addition, compared with the materials with the same size, the film material has smaller scale in the thickness direction and larger contact area with the environment and responds to temperature more sensitively; meanwhile, a film sensor meets the requirements on miniaturization and integration of sensors. A preparation method for the film has the obvious characteristics of easy batch production and industrialization.

Description

technical field [0001] The invention relates to a thin film for temperature measurement or electric heating and a crucible element thereof, belonging to the technical field of functional materials. Background technique [0002] High-temperature acid, alkali liquid and high-temperature molten salt are highly corrosive, and an oxide protective sheath is usually required when using a thermocouple to measure temperature, which causes the thermocouple to be in a non-contact state with the liquid or molten salt, and the reflected temperature is obtained through protection The set of heat conduction is obtained, which will cause a lag in the response to the temperature of the measured object. Infrared thermometers can also be used to obtain temperature by detecting the radiation infrared rays of high-temperature corrosive liquids or molten salts, but this method is also non-contact temperature measurement and is susceptible to thermal disturbances of their volatiles. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/00H05B3/10
Inventor 朱新德李胜利
Owner SHANDONG UNIV
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