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

A technology of corrosion resistance and electric heating, which is applied in the direction of heating element materials, thermometers using directly heat-sensitive electric/magnetic elements, measuring heat, etc., can solve the problem of delayed reflection of the temperature of the measured object, inability to obtain internal temperature, and volatilization Problems such as physical and thermal disturbances, to achieve the effects of improving corrosion resistance, easy batch production, and wide measurement temperature range

Inactive Publication Date: 2011-08-03
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

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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 method for preparing the corrosion-resistant film for temperature measurement or electric heating includes the following steps:

[0036] 1). Preparation of La 0.8 Sr 0.2 MnO 3 Sol, mole ratio La:Sr:Mn=0.8:0.2:1 Dissolve lanthanum nitrate, strontium nitrate, and manganese nitrate in deionized water to prepare 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 obtain La 0.8 Sr 0.2 MnO 3 Sol. The molar ratio of metal cation to citric acid is 1:0.8, and the molar ratio of citric acid to ethylene glycol is 1:6;

[0037] 2). Preparation of La 0.8 Sr 0.2 MnO 3 Gel, heat and stir the sol prepared in step 1) at 90°C until it becomes viscous, and then stand and dry at 90°C for 36 hours to obtain La 0.8 Sr 0.2 MnO 3...

Embodiment 2

[0045] A corrosion-resistant film for temperature measurement or electric heating, composed of 97% by weight 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 method for preparing the corrosion-resistant film for temperature measurement or electric heating includes the following steps:

[0047] 1). Preparation of La 0.5 Sr 0.5 MnO 3 Sol, molar ratio La:Sr:Mn=0.5:0.5:1 Dissolve lanthanum nitrate, strontium nitrate, and manganese nitrate in deionized water to prepare a solution, then add the prepared citric acid and ethylene glycol solution, and stir Make a sol and continue to stir for 3 hours to obtain La 0.5 Sr 0.5 MnO 3 Sol. The molar ratio of metal cation to citric acid is 1:3, and the molar ratio of citric acid to ethylene glycol is 1:2;

[0048] 2). Preparation of La 0.5 Sr 0.5 MnO 3 Gel, heat and stir the sol prepared in step 1) at 60°C until it becomes viscous, and then stand and dry at 60°C for 12 hours to obtain La 0.5 Sr 0.5 MnO 3 gel...

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 with the wire, and then put the sample together with the fixture into a box-shaped resistance furnace to heat up, where the heating rate is 4℃ / min, and the heating temperature range is Room temperature to 800°C. The wire outside the furnace is connected with a multimeter, and the resistance data of the thin film element is recorded every 5°C, and finally the resistance change of the sample heated from room temperature to 800°C in an air atmosphere is obtained. Image 6 The resistance change of the thin film element on the outer wall of the crucible from room temperature to 800℃ is given. From Image 6 It can be seen that the resistance of the element changes with the temperature to show an obvious negative temperature thermosensitive effect, and it has the potential to develop into a thermosensitive device.

[0...

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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 resistanceof 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 film for temperature measurement or electric heating and its crucible element, belonging to the technical field of functional materials. Background technique [0002] High-temperature acid, alkali liquid and high-temperature molten salt are highly corrosive, usually when using thermocouple to measure temperature, an oxide protective cover is required, which causes the thermocouple to be in a non-contact state with liquid or molten salt, and the reflected temperature is through protection The heat conduction of the jacket is obtained, which will cause a delay in the response to the temperature of the measuring object. Infrared thermometers can also be used to obtain the temperature by detecting the radiant infrared rays of high-temperature corrosive liquids or molten salts, but this method is also non-contact temperature measurement and is easily disturbed by their volatile heat. In addition, the infrared thermometer mainly reflec...

Claims

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Application Information

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