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Composition for preparing electrode adhesive layer of automobile oxygen sensor and method for preparing electrode adhesive layer

The invention relates to a technology of an automobile oxygen sensor and a manufacturing method, which are applied in the field of the composition field for making an electrode adhesion layer of an automobile oxygen sensor, and can solve the problems of electrode shedding, low bonding strength, low bonding strength of the electrode layer, etc., and achieve uniform shrinkage and increase roughness. Degree, easy adhesion effect

Inactive Publication Date: 2013-03-27
TIANJIN RUIYITAIKE AUTO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the activity of pure platinum electrodes can only be achieved at lower temperatures, when platinum electrodes are co-fired with zirconium tubes, the bonding strength of the two materials is low, and the electrodes are easy to fall off.
In addition, when the electrode protective layer is made by plasma spraying, since the surface of the zirconium tube and the electrode layer are very smooth, the bonding strength between the electrode protective layer and the smooth zirconium tube body and electrode layer is not high

Method used

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  • Composition for preparing electrode adhesive layer of automobile oxygen sensor and method for preparing electrode adhesive layer

Examples

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Effect test

Embodiment 1

[0020] Mix 2wt% ethyl cellulose and 98wt% terpineol, and make it into a diluent by heating in a water bath. Put the molar ratio as Y 2 o 3 : ZrO 2 =2:98 ceramic powder and the prepared diluent are made into slurry according to the weight ratio of 1:1. Referring to the accompanying drawings, fix the zirconium tube blank 1 on the electric rotary tooling, use a brush to dip an appropriate amount of slurry and evenly coat a layer of slurry on the blank, and dry the coated area 4 in an oven at 60°C. The adhesion layer 2 is finished, and its thickness is 0.1 mm. Electrodes are then printed on the adhesive layer by pad printing. After the zirconium tube and the electrode are co-fired, the electrode layer 3 and the adhesion layer are closely combined with the zirconium tube body. When the electrode protective layer 5 is made by plasma spraying, the protective layer 5 is also easily attached to the electrode layer.

Embodiment 2

[0022] Mix 10wt% ethyl cellulose and 90wt% terpineol, and make it into a diluent by heating in a water bath. Put the molar ratio as Y 2 o 3 : ZrO 2 =5:95 ceramic powder and the prepared diluent are made into slurry according to the weight ratio of 1:1.5. Referring to the accompanying drawings, fix the zirconium tube blank 1 on the electric rotary tooling, dip a proper amount of slurry with a brush and evenly coat a layer of slurry on the blank, and dry the coated area 4 with a drying oven at 80°C. Dry, the adhesion layer 2 is finished, and its thickness is 0.2mm. Electrodes are then printed on the adhesive layer by pad printing. After the zirconium tube and the electrode are co-fired, the electrode layer 3 and the adhesion layer are closely combined with the zirconium tube body. When the electrode protective layer 5 is made by plasma spraying, the protective layer 5 is also easily attached to the electrode layer.

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Abstract

The invention discloses a composition for preparing an electrode adhesive layer of an automobile oxygen sensor. The composition comprises the following components in parts by weight: 1 part of ceramic powder, and 1-1.5 parts of a diluter, wherein the ceramic powder is prepared from yttrium oxide (Y2O3) and zirconium oxide (ZrO2) according to a molar ratio of (5-8):(92-95); and the diluter is prepared from a mixture which is heated in water bath, wherein the mixture contains 2-10wt% of ethyl cellulose and 90-98wt% of terpilenol, and the temperature of the heating in the water bath is 70-90 DEG C. The invention also discloses a method for preparing the electrode adhesive layer by using the composition. According to the composition and the method, the electrode adhesive layer can be tightly combined with a zirconium tube blank body and can enhance the roughness of the zirconium tube blank; and when an electrode protective layer is prepared by using a plasma spraying method, the electrode protective layer is easily adhered to an electrode and the zirconium tube blank body.

Description

technical field [0001] The method relates to an automobile oxygen sensor, in particular to a composition for making an electrode adhesion layer of an automobile oxygen sensor and a preparation method of the electrode adhesion layer. Background technique [0002] An important component of an automotive oxygen sensor is a zirconium tube that generates a voltage signal. Zirconium tubes are composites of multilayer materials. The production process of the existing zirconium tube includes the following steps: firstly, the pure platinum electrode is made by printing on the zirconia tubular body, after high temperature firing, then the protective layer is made by plasma spraying, and finally the insulating layer is made . [0003] Since the activity of pure platinum electrodes can only be achieved at lower temperatures, when platinum electrodes are co-fired with zirconium tubes, the bonding strength of the two materials is low, and the electrodes are easy to fall off. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
Inventor 谭焕银
Owner TIANJIN RUIYITAIKE AUTO ELECTRONICS
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