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A kind of slurry, reference gas layer and its preparation method and oxygen sensor

A gas layer and slurry technology, applied in the direction of instruments, scientific instruments, analytical materials, etc., can solve the problems of poor oxygen sensor performance, poor shape retention and tolerance of the reference channel, unsuitable for industrial operation, etc., to achieve shape retention and the effect of good tolerance, good performance, good shape retention and tolerance

Inactive Publication Date: 2018-12-18
BEIJING BMD AUTO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shape retention and tolerance of the reference channel in the reference gas layer provided by the existing technology are poor, and the method of manually filling the reference channel with content is usually used to enhance the shape retention and tolerance of the reference channel , such as adding wood chips or processed waste paper chips into the reference channel, but this operation to improve the shape retention and tolerance of the reference channel is cumbersome and not suitable for industrial operations; the prior art also provides an improved The method for the conformality and tolerance of the reference channel is to paint the slurry on the surface of the reference channel to improve the conformality and tolerance of the reference channel, but the reference channel prepared by using the slurry provided by the prior art The conformality and tolerance of the ratio channel are poor, resulting in poor performance of the prepared oxygen sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] The invention provides a kind of preparation method of reference gas layer, comprising:

[0075] The slurry is printed on the surface of the reference channel and dried to obtain a reference air layer, and the slurry is the slurry described in the above technical solution.

[0076] In an embodiment of the present invention, the printing thickness may be 85 microns to 120 microns; in other embodiments, the printing thickness may be 90 microns to 110 microns. In an embodiment of the present invention, the printing speed may be 4cm / s~6cm / s; in other embodiments, the printing speed may be 4.5cm / s~5.5cm / s; in another In an embodiment, the printing speed may be 5 cm / s.

[0077] In an embodiment of the present invention, the distance between the screen and the substrate during the printing process may be 3 mm to 5 mm; in other embodiments, the distance between the screen and the substrate during the printing process may be 3.5 mm to 4.5 mm ; In another embodiment, the distan...

Embodiment 1

[0112] Add 40g of graphite powder with a particle size of 12500 mesh into a beaker, add 15g of turpentine and 25g of terpineol to the beaker, stir with a glass rod, and mix well to obtain a mixed solution;

[0113] The beaker was placed in warm water at 55°C, and 10 g of melamine resin was added to the mixed solution while stirring until the melamine resin was completely dissolved to obtain an intermediate mixture;

[0114] Take out the beaker, after the intermediate mixture is cooled to 25°C, add 3g of dispersant, 6g of plasticizer, 3g of leveling agent and 3g of wetting agent to the intermediate mixture, and transfer the resulting mixed product to Alumina ball milling beads were added to a ball mill jar made of zirconia, and ball milled at a speed of 320 rpm for 24 hours to obtain a slurry.

[0115] The viscosity of the slurry prepared in Example 1 of the present invention was tested using a DV-II rotational viscosity tester provided by BROOKFIELD, USA. The test result showe...

Embodiment 2

[0117] Add 55g of graphite powder with a particle size of 4000 mesh into the beaker, add 28g of isopropanol into the beaker, stir with a glass rod, and fully mix to obtain a mixed solution;

[0118] The beaker was placed in warm water at 50°C, and 12 g of acrylic resin was added to the mixture while stirring until the acrylic resin was completely dissolved to obtain an intermediate mixture;

[0119] Take out the beaker, after the intermediate mixture is cooled to 25°C, add 1g of dispersant, 2g of plasticizer, 1g of leveling agent and 1g of wetting agent to the intermediate mixture, and transfer the resulting mixed product to Alumina ball milling beads were added into a ball mill jar made of zirconia, and ball milled at a speed of 300 rpm for 20 hours to obtain a slurry.

[0120] The viscosity of the slurry prepared in Example 2 of the present invention was tested using a DV-II rotational viscosity tester provided by BROOKFIELD Corporation of the United States. The test result ...

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PUM

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Abstract

The invention provides a sizing agent comprising graphite powder, a solvent, a binding agent, a dispersant, a plasticizer, a leveling agent and a wetting agent, wherein the solvent comprises one or more of turpentine, terpineol and isopropanol; the binding agent comprises one or two of melamine resin and acrylic resin; and the mass ratio of the graphite powder to the solvent to the binding agent to the dispersant to the plasticizer to the leveling agent to the wetting agent is (40-90):(10-80):(5-45):(1-15):(1-20):(1-10):(1-5). The sizing agent provided by the invention comprises the graphite powder which is matched with the other raw materials to ensure that the sizing agent is relatively good in performance; and the sizing agent is used for preparing a reference gas layer and can ensure that a reference channel in the prepared reference gas layer has relatively good conformality and tolerance. The invention also provides the reference gas layer, a preparation method of the reference gas layer and an oxygen sensor.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a slurry, a reference gas layer, a preparation method thereof, and an oxygen sensor. Background technique [0002] The oxygen sensor is the key sensing component of the automobile engine control system, which can control the exhaust emission of the automobile, reduce the pollution of the automobile to the environment, and improve the fuel combustion quality of the engine. The oxygen sensor is generally installed on the exhaust pipe of the engine, monitors the oxygen concentration in the exhaust gas of the vehicle, and feeds the monitoring information back to the electronic control unit (ECU), so that the ECU can adjust the fuel injection amount and ignition time, so as to achieve the best air condition of the engine. The fuel ratio closed-loop control ensures that the three-way catalytic converter realizes the reduction of hydrocarbons (HC), CO and nitrogen oxides (NO)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/409
Inventor 汪海波
Owner BEIJING BMD AUTO TECH
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