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Heating electrode paste, heating electrode and planar oxygen sensor comprising heating electrode

A technology for heating electrodes and slurry, which is applied in the field of oxygen sensors, can solve the problems of high cost of heating electrodes and low heating efficiency, and achieve the effects of cost reduction, high heating efficiency, and lower resistivity

Active Publication Date: 2012-03-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of high cost and low heating efficiency of the heating electrode used in the oxygen sensor in the prior art

Method used

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  • Heating electrode paste, heating electrode and planar oxygen sensor comprising heating electrode
  • Heating electrode paste, heating electrode and planar oxygen sensor comprising heating electrode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] In the preparation method of the heating electrode slurry of the present invention, the inorganic powder and the organic slurry carrier are directly mixed evenly; wherein, the inorganic powder contains tantalum silicide, niobium alloy, aluminum oxide and silicon dioxide. In order to mix the components in the heating electrode slurry evenly, preferably, first mix the inorganic powder evenly and then ball mill to the required particle size; then mix the components in the organic slurry carrier evenly; finally mix the inorganic powder It is mixed with an organic slurry carrier, stirred evenly, and finally ground to obtain the heating electrode slurry of the present invention. In the present invention, there are no special restrictions on the grinding conditions. Preferably, the grinding conditions are such that the fineness of the obtained heating electrode slurry is less than 10 μm, and the viscosity of the heating electrode slurry is 120-250Pa. S. The term "fineness" is...

Embodiment 1

[0029] This example is used to illustrate the heating electrode slurry and its preparation method of the present invention.

[0030] (1) Take the inorganic powder according to the ratio in Table 1:

[0031] Table 1

[0032] Inorganic components

Tantalum silicide

Niobium alloy

Aluminum oxide

Silicon oxide

Lanthanum oxide

Ceria

Content (wt%)

85

3.5

6

4

0.8

0.7

Particle size (μm)

≤1.2

≤1.5

≤1.2

≤0.8

≤1.0

≤1.0

Median diameter (μm)

≤0.8

≤0.5

≤0.6

≤0.5

≤0.6

≤0.6

[0033] Mix the components in the inorganic powder in a planetary ball mill, and ball mill for 40 hours to obtain the inorganic component; wherein, the ball milling medium is absolute ethanol, the mass ratio of zirconia ceramic balls to the inorganic powder is 2:1, and the ball milling tank speed is 300rpm .

[0034] (2) take t...

Embodiment 2

[0047] The same steps as in Example 1 were used to prepare the heating electrode slurry of this example, except that in step (1), the ratio of the inorganic components is shown in Table 4 below:

[0048] Table 4

[0049] Inorganic components

[0050] Through the above steps, the heating electrode slurry of this embodiment is obtained, which is denoted as S2.

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Abstract

The invention provides a heating electrode paste, which comprises an inorganic powder and an organic paste carrier, wherein the inorganic powder comprises tantalum silicide, niobium alloy, aluminum oxide and silicon oxide. The invention also provides a heating electrode obtained by sintering the heating electrode paste and a planar oxygen sensor comprising the heating electrode. In the heating electrode paste provided by the invention, the tantalum silicide and the niobium alloy are adopted, thereby, the heating efficiency is very high, and the cost is lower.

Description

technical field [0001] The invention belongs to the field of oxygen sensors, in particular to a heating electrode slurry, a heating electrode, and a chip oxygen sensor containing the heating electrode. Background technique [0002] The oxygen sensor is one of the core components of the closed-loop controlled automotive engine electronic fuel injection system (EMS). It is installed on the exhaust pipe of the automotive engine and is used to detect the oxygen content in the exhaust gas exhausted by the engine. The currently used chip oxygen sensor uses zirconia as the solid electrolyte. Zirconium dioxide has very low conductivity at low temperatures, making oxygen sensors work at temperatures above 350°C. Therefore, commonly used chip oxygen sensors are equipped with a heating body for heating the solid electrolyte. [0003] For example, CN101000320A discloses a chip oxygen sensor and its preparation method. The chip oxygen sensor includes a heater and an oxygen sensitive pr...

Claims

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Application Information

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IPC IPC(8): H01B1/20G01N27/409
Inventor 王田军向其军徐斌刘梦辉
Owner BYD CO LTD
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