Lanthanum chromite-doped film type thermocouple and preparation method thereof

A technology of lanthanum chromate thin film and thermocouple, which can be used in the manufacture/processing of thermoelectric devices, materials for lead-out wires of thermoelectric devices, and thermometers with electric/magnetic elements that are directly sensitive to heat, etc., which can solve the instability of high temperature measurement , the maximum temperature limit, restricting the application of ITO thin films, etc., to achieve the effect of low cost, high operating temperature and high sensitivity

Inactive Publication Date: 2016-08-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, further research has found that ITO series thin film thermocouples will have very severe thermal volatilization in the high temperature region above 1000 °C, which will cause instability in high temperature measurement and limit the maximum temperature.
This severely restricts the application of ITO thin films in high-temperature measurement fields such as high-temperature hot runners.

Method used

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  • Lanthanum chromite-doped film type thermocouple and preparation method thereof
  • Lanthanum chromite-doped film type thermocouple and preparation method thereof
  • Lanthanum chromite-doped film type thermocouple and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] La selected 0.8 Sr 0.2 CrO 3 And LaCrO 3 The powder is used as a thermocouple electrode material, and a thick film electrode is deposited on an alumina ceramic substrate 3 with a thickness of 1 mm by a screen printing process. The ceramic slurry used for screen printing is made of La 0.8 Sr 0.2 CrO 3 And LaCrO 3 The particle size of the powder is about 200nm, using a 1:2 mixed solution of ethyl cellulose and terpineol as the organic solvent, adding the ceramic powder to the organic matter in a ratio of 1:1 and mixing with strong stirring. Ceramic paste for screen printing. In order to obtain a good patterning, a U-shaped structure mask with a thermal electrode length of 12 cm and a width of 0.8 cm was selected to prepare the thick film electrode by screen printing. The screen used was 200 mesh. Print the ITO thick film on the substrate first, and then print the indium oxide thick film. After the two thick film materials are deposited, the thick film sample is heat treated...

Embodiment 2

[0038] La selected 0.9 Sr 0.1 CrO 3 And LaCrO 3 The powder is used as the material of thermocouple electrode, and the thick film electrode is deposited on the alumina ceramic substrate with a thickness of 3mm by the screen printing process. The ceramic slurry used for the screen printing is made of La 0.9 Sr 0.1 CrO 3 And LaCrO 3 The particle size of the powder is about 100nm, using a 1:2 mixed solution of ethyl cellulose and terpineol as the organic solvent, adding the ceramic powder to the organic matter in a ratio of 2:3 and mixing vigorously as Ceramic paste for screen printing. In order to obtain a good patterning, a U-shaped structure mask with a thermal electrode length of 25 cm and a width of 1.5 cm was selected to prepare the thick film electrode by screen printing. Print LaCrO on the substrate first 3 Thick film, then print La 0.9 Sr 0.1 CrO 3 Thick film. After the two thick film materials are deposited, the thick film sample is heat treated in a muffle furnace at 1200...

Embodiment 3

[0040] La selected 0.8 Sr 0.2 CrO 3 And La 0.9 Sr 0.1 CrO 3 The powder is used as the electrode material of the thermocouple, and the thick film electrode is deposited on the alumina ceramic substrate with a thickness of 10mm by the screen printing process. The ceramic slurry used for the screen printing is made of La 0.8 Sr 0.2 CrO 3 And La 0.9 Sr 0.1 CrO 3 The particle size of the powder is about 200nm, using a 1:2 mixed solution of ethyl cellulose and terpineol as the organic solvent, adding the ceramic powder to the organic matter in a ratio of 1:1 and mixing with strong stirring. Ceramic paste for screen printing. In order to obtain a good patterning, a U-shaped structure mask with a thermal electrode length of 20 cm and a width of 1.0 cm was selected to prepare the thick film electrode by screen printing. The screen used was 200 mesh. First print the ITO thick film on the substrate, and then print the indium oxide thick film. After the two thick film materials are deposite...

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Abstract

The invention discloses a doped lanthanum chromite film type thermocouple and a preparation method thereof, aiming at meeting requirements of measuring at high temperature under extreme environment. The technical solution of the invention is such that: a doped lanthanum chromite film type thermocouple includes two hot electrodes which are disposed on a ceramic substrate; the two hot electrodes are in mutually overlapped connection; the materials of the two hot electrodes individually adopt a lanthanum chromite film which is doped with one or a plurality of doping elements of Mg, Ca, Sr, Ba, Co, Cu, Sm, Fe, Ni and V; the lanthanum chromite films of the two hot electrodes are doped with different types of doping elements, or are doped with the same type of doping elements having different contents.

Description

Technical field [0001] The invention relates to the field of sensor preparation technology and high-temperature temperature measurement technology, in particular to a doped lanthanum chromate film type thermocouple and a preparation method thereof. Background technique [0002] In the aero-engine design and verification experiment, in order to verify the combustion efficiency of the engine and the design of the cooling system, it is necessary to accurately test the temperature of the surface of the engine's turbine blades and the internal combustion chamber. Compared with traditional linear and block thermocouples, high-temperature ceramic thin-film thermocouples have the characteristics of small heat capacity, small size, and fast response speed. They can capture instantaneous temperature changes. At the same time, thin-film thermocouples can be directly deposited on the surface of the measured object. , Does not damage the structure of the tested component, and has a small impa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/02C04B35/50
CPCC04B35/50G01K7/02C04B2235/3275C04B2235/3279C04B2235/3272C04B2235/3281C04B2235/3239C04B2235/3208C04B2235/3206C04B2235/3213C04B2235/3224C04B2235/3227C04B2235/3215C04B35/12C04B35/62222G01K7/028H10N10/851H10N10/01H10N10/17C04B2235/3241
Inventor 史鹏任巍刘丹刘明田边蒋庄德
Owner XI AN JIAOTONG UNIV
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