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Oxygen sensor electrode slurry and oxygen sensor sensing layer and preparation methods thereof

An electrode slurry and oxygen sensor technology, which is applied in the direction of material analysis, instruments, and scientific instruments by electromagnetic means, can solve the problem that the performance of the oxygen sensor electrode slurry cannot meet the requirements, and the bonding force between the coating and the zirconia substrate is poor. , large resistance and other problems, to achieve the effect of excellent catalytic performance, improved sintering performance, and reduced process requirements

Active Publication Date: 2013-10-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the invention is to overcome the problem that the performance of the existing oxygen sensor electrode slurry does not meet the requirements, resulting in poor bonding force and high resistance between the coating formed after co-firing and the zirconia substrate, and provides An oxygen sensor electrode slurry with excellent performance, which makes the coating formed after co-firing have strong bonding force and low resistance with the zirconia substrate, so that the final oxygen sensor sensing layer has excellent catalytic performance

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] The present invention also provides a method for preparing the electrode slurry, wherein the method comprises uniformly mixing a raw material mixture, and then grinding, the raw material mixture contains an inorganic binder, an organic binder, platinum metal powder and Rare earth metal powder and / or rare earth metal oxide powder.

[0021] The rare earth metal powder and / or rare earth metal oxide powder can be various rare earth metal powders and / or rare earth metal oxide powders that can achieve the above effects. Preferably, the rare earth metal powder can be metal cerium powder, metal One or more of lanthanum powder and metal praseodymium powder, the rare earth metal oxide powder can be one or more of cerium oxide powder, lanthanum oxide powder and praseodymium oxide powder, the rare earth metal powder and / or The average particle diameter of the rare earth oxide powder can vary widely, and is preferably 0.1-2 μm.

[0022] In the present invention, the amount of each ...

Embodiment 1

[0034] This embodiment is used to illustrate the oxygen sensor electrode slurry and its preparation method provided by the present invention.

[0035] (1) Add the following particle powders with an average particle diameter of less than 1 μm into a planetary ball mill, and ball mill for 20 hours at a speed of 400 rpm: 60 parts by weight of silicon dioxide, 15 parts by weight of aluminum oxide, 5 parts by weight of aluminum oxide The magnesium oxide of magnesium oxide, the zinc oxide of 5 weight parts, the titanium dioxide of 5 weight parts, the sodium carbonate of 5 weight parts and the calcium carbonate of 5 weight parts; Filter with 400 order filter cloth afterwards, the slurry through filter cloth is placed in oven Dry at 80°C; place the dried powder in a corundum crucible, heat it to 1100°C in an air atmosphere, keep it at this temperature for 30 minutes, take it out, crush it, pass through a 400-mesh sieve, and keep the obtained powder for later use .

[0036] (2) Stir 1...

Embodiment 2

[0043] This embodiment is used to illustrate the oxygen sensor electrode slurry and its preparation method provided by the present invention.

[0044] (1) Add the following particle powders with an average particle diameter of less than 1 μm into a planetary ball mill, and ball mill for 20 hours at a speed of 400 rpm: 50 parts by weight of silicon dioxide, 20 parts by weight of aluminum oxide, 10 parts by weight of aluminum oxide The magnesium oxide of magnesium oxide, the zinc oxide of 5 weight parts, the titanium dioxide of 5 weight parts, the sodium carbonate of 2 weight parts and the calcium carbonate of 8 weight parts; Filter with 400 mesh filter cloth afterwards, the slurry through filter cloth is placed in oven Dry at 80°C; place the dried powder in a corundum crucible, heat it to 1100°C in an air atmosphere, keep it at this temperature for 30 minutes, take it out, crush it, pass through a 400-mesh sieve, and keep the obtained powder for later use .

[0045] (2) Stir 2...

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Abstract

The invention provides oxygen sensor electrode slurry. The electrode slurry comprises an inorganic binder, an organic binder, platinum metal powder, rare-earth metal powder and / or rare-earth metal oxide powder. The invention also provides a preparation method of the electrode slurry, a method for preparing an oxygen sensor sensing layer by using the slurry, and the oxygen sensor sensing layer prepared by the method. The high-temperature sintering property of the electrode slurry is obviously improved, a coating formed by cofiring has high binding force with a zirconium oxide substrate and has low resistance, and the final oxygen sensor electrode has high catalytic property. In addition, the cofiring in air atmosphere can be realized, so the process requirement of industrial production is reduced to improve production efficiency; and due to the addition of the rare-earth metal powder and / or rare-earth metal oxide, the using amount of the platinum metal powder in the electrode slurry can be reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to an oxygen sensor electrode slurry and a preparation method thereof, a method for preparing an oxygen sensor sensing layer using the electrode slurry, and an oxygen sensor sensing layer prepared by the method. Background technique [0002] In the three-way control system of the automobile engine, the electronically controlled fuel supply unit, the oxygen sensor, and the three-way catalyst are the cores of the control system. In the modern engine EFI system, the most used oxygen sensor is to detect the theoretical air-fuel ratio oxygen sensor, which mainly keeps the engine working near the theoretical air-fuel ratio, so that the three-way catalyst is in the best working range. The currently widely used oxygen sensor is the concentration-type zirconia oxygen sensor, which mainly adopts tubular and chip structures. Among them, the chip oxygen sensor has become a new generation of widely used oxygen sensor products due to its short ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/409
Inventor 陈福平郭聪向其军
Owner BYD CO LTD