Zirconia-based NOx sensor and preparation method thereof
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A zirconia-based, sensor technology, used in instruments, scientific instruments, measuring devices, etc., can solve problems such as insufficient reliability
Inactive Publication Date: 2014-06-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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But there are also shortcomings, such as when the NOx concentration of the current type NOx sensor is very low, the current intensity may be nanoampere, and the requirements for the sensor post-processing circuit are very high at this time; when using the electromotive force type NOx sensor , its reliability for long-term use is insufficient
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[0031] The above-mentioned preparation method of a sensor for measuring NOx concentration by AC impedance comprises the following steps:
[0032] Preparation of alumina substrates using recognized techniques;
[0033] Using thick film screen printing technology to print a Pt heating body on the surface of an alumina substrate to form a heating body;
[0034] Print two Pt leads on the surface of another alumina substrate;
[0035] Two alumina substrates are stacked and co-fired to prepare a heating body;
[0036] Coat one section of the two lead wires on the surface of the heating body with LSM slurry, dry, and sinter at 1200°C for 2 hours;
[0037] Coat the surface of alumina / LSM with zirconia slurry for 1 to 5 times; dry and sinter at 1200°C for 2 hours.
[0038] Compared with the prior art, the sensor prepared by the invention has a lower concentration detection function, and the preparation process is simple, which can reduce production costs and save resources. When wo...
Embodiment 1
[0040] The thickness of the aluminum oxide layer prepared by tape casting technology is 0.3 mm. Use thick film screen printing technology to print Pt heating body on the surface of one alumina substrate to form a heating body; print Pt lead wires on the surface of another alumina substrate; stack these two alumina substrates to prepare heating body.
[0041] Coat one section of the two leads on the surface of the heating body with LSM slurry, dry, and sinter at 1200°C for 2 hours; coat the surface of alumina / LSM with zirconia slurry for 5 times; dry, and sinter at 1200°C 2 hours. The thickness of the zirconia layer is 0.05mm, and the diameter of the LSM is 0.02mm
[0042] Test Example
[0043] Adopt the NOx sensor prepared by the present invention to different NO 2 Concentration was tested. from image 3 It can be seen from the figure that the NO from 0 to 1000ppm at 1 to 100Hz 2 can be distinguished.
[0044] This proves that the present invention provides a sensor fo...
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Abstract
The invention provides a sensor for measuring the concentration of NOx through measuring the alternating current (AC) impedance, and a preparation method thereof. The preparation method comprises the following steps: adopting an alumina cast sheet forming technology to laminate and burn multiple layers of heating units into a whole body so as to form an authentic direct heating structure; covering the surface of the alumina heating body with a Pt wire and a sensitive body, wherein the sensitive body is arranged on an insulation layer and is composed of a Pt wire, a zirconia layer, and (LaSr<1-x>)MnO3(LSM) and the x is in a range of 1 to 0. When the zirconia-based NOx sensor is in a normal work state, the work voltage (VW) is 10 to 50 mV, and the heating voltage (VH) is 12 V. The detectable range of NOx concentration is 0 to 500 ppm, the response time is less than 2 seconds, and the sensor is suitable for detecting NOx with a low concentration. The sensor can detect NOx with a lower concentration, and has the advantages of simple preparation technology, reduction on production cost, and resource saving.
Description
technical field [0001] The invention relates to a zirconia-based NOx sensor and a preparation method thereof, in particular to a sensor for testing NOx concentration by an electrochemical AC impedance test method and a preparation method thereof. technical background [0002] With the acceleration of my country's urbanization process, the consumption of fossil fuels has increased rapidly, and many toxic and harmful gases have been released into the atmosphere to pollute the environment. The most typical type is NOx gas, which not only causes photochemical smog and acid rain, Destruction of the ozone layer will also have side effects on the human respiratory system, such as hair loss, throat inflammation, impaired vision, and decreased respiratory system resistance. Therefore, nitrogen oxide emission reduction is listed as one of the requirements for environmental protection. The key technology to reduce NOx gas emissions is to accurately measure NOx gas and then control the ...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 冯涛刘革命夏金峰粘洪强黄德信徐兵李雨林徐海芳蒋丹宇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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