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Tubular oxygen sensor Pt inner electrode coating process and equipment used in process

An oxygen sensor and a coating process technology, which is applied to the Pt inner electrode coating process of a tubular oxygen sensor and the equipment used in its processing, can solve the problems of low production efficiency, uneven thickness and width of the coating layer, platinum electrode slurry Material gram weight and other issues to achieve the effect of improving production efficiency and ensuring consistency

Pending Publication Date: 2020-05-08
CHANGZHOU LAMBDA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is faced with the thickness and unevenness of the coating layer, and the weight of the platinum electrode slurry, which cannot be accurately controlled, and thus cannot effectively control product performance.
At the same time, manual coating still faces the problems of long learning time and low production efficiency

Method used

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  • Tubular oxygen sensor Pt inner electrode coating process and equipment used in process
  • Tubular oxygen sensor Pt inner electrode coating process and equipment used in process
  • Tubular oxygen sensor Pt inner electrode coating process and equipment used in process

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Embodiment Construction

[0026] A kind of tubular oxygen sensor Pt inner electrode coating process, comprises the following steps:

[0027] Step 1, mixing Pt powder and binder to make slurry;

[0028] Step 2: Use 0.2-50MPa compressed air to atomize the slurry, the atomization time is 10-50s, and spray the atomized slurry inside the zirconium tube body to form a ring-shaped inner electrode;

[0029] Step 3. Place the zirconium tube blank on the centrifugal disc of the centrifuge, rotate at a speed of 500-5000 rpm, and form the lead wire of the vertical line on the outermost side of the inner wall of the zirconium tube blank with the slurry;

[0030] Step 4: Sinter the zirconium tube body in a furnace, and cool naturally in the air after sintering to obtain the finished product.

[0031] According to another embodiment of the present invention, it further includes that in step 1, the particle size of the Pt powder is 0.05-0.5 μm, and the solid content of the slurry is 40-80%.

[0032] According to ano...

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Abstract

The invention relates to the technical field of oxygen sensor production, in particular to a tubular oxygen sensor Pt inner electrode coating process and equipment used in the process. The process comprises the following steps that 1, Pt powder and a binder are mixed to prepare slurry; 2, compressed air of 0.2-50 MPa is adopted for atomizing the slurry, wherein the atomizing time is 10-50 s, and the atomized slurry is sprayed on the interior of a zirconium tube blank, so that an annular inner electrode is formed; 3, the zirconium tube blank is placed on a centrifugal disc of a centrifugal machine, and rotating is carried out at the speed of 500-5000 r / min, so that a lead perpendicular to a line is formed on the outermost side of the inner wall of the zirconium tube blank through the slurry; and 4, the zirconium tube blank is sintered in a furnace and naturally cooled in air after sintering is finished, so that a finished product is obtained. The tubular oxygen sensor Pt inner electrodecoating process has the advantages that the consistency of the thickness and the width of the product Pt electrode is ensured; the use gram weight of the Pt slurry is controlled; the learning cost ofpersonnel during preparation through the process is reduced; and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oxygen sensor production, in particular to a process for coating a Pt inner electrode of a tubular oxygen sensor and equipment used in its processing. Background technique [0002] The oxygen sensor for vehicles uses zirconia electrolyte as the key material to measure the voltage or current generated by the difference between the oxygen content in the exhaust gas and the air, so as to determine the oxygen content in the exhaust gas; and then control the fuel combustion. In the tubular oxygen sensor, the inner and outer walls of the zirconium tube need to be coated with Pt slurry and sintered to serve as catalytic electrodes. At present, the existing coating process is generally to coat the platinum slurry on the inner body of the zirconia ceramic tube by manual dipping and stirring ring coating, and then perform high-temperature sintering to form the Pt inner electrode. This method is faced with the unev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22B22F3/10B22F7/02
CPCB22F3/22B22F3/10B22F3/003B22F7/02B22F2999/00B22F1/05B22F1/103B22F1/10B22F2202/17
Inventor 毛泽军韩旻
Owner CHANGZHOU LAMBDA ELECTRONICS
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