Method for co-firing ceramic sensing head substrate and platinum gold electrode of oxygen sensor

Abstract

The invention discloses a co-fired method used for an oxygen sensor ceramic sensing head substrate and a platinum electrode, comprising the steps as follows: A, the ceramic sensing head billet is sintered for 2-4 hours in a sintering furnace at the temperature of 900-1,100 DEG C and cooled with the furnace to the temperature of 150-200 DEG C and then taken out and cooled in the air; B, the surface of the ceramic sensing head substrate is cleaned by an air gun and subsequently coated by the platinum electrode layer; C, the ceramic sensing head substrate with the surface coated by the platinum electrode layer is arranged in a high-temperature sintering furnace and sintered for 4-7 hours at the temperature of 1,400-1,600 DEG C. The invention provides a novel co-fired process method which effectively reinforces the compressive strength of a ceramic sensing head forming body, leads the platinum particles to be embedded into the ceramic sensing head substrate which is sintered in a box and has a plurality of holes on the surface, so as to lead the platinum and the ceramic sensing head substrate to be fused with each other, greatly reinforce the adhesion strength of the platinum electrode layer and the substrate, thus effectively reinforcing the compressive strength of the ceramic sensing head forming body.

Description

Technical field: [0001] The invention relates to a co-firing technology of a ceramic sensing head of an oxygen sensor for a vehicle, in particular to a co-firing process method of a ceramic sensing head base body and a platinum electrode. Background technique: [0002] The oxygen sensor is used to detect the oxygen content in the vehicle exhaust, and transmit the data to the computer system to control the air-fuel ratio, so as to achieve the purpose of improving combustion efficiency, reducing air pollution and saving fuel. [0003] The preparation method of the conventional oxygen sensor ceramic sensor head is: the ceramic green body is directly coated with platinum electrodes and then co-sintered. The disadvantages of this process method are: [0004] The coating process of the platinum electrode will generate certain pressure on the ceramic sensing head, so the sensing head is required to have corresponding compressive strength. The strength of the green body without si...

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Problems solved by technology

[0007] For this reason, the purpose of the present invention is to provide a new method of co-firing the ceramic sensing head substrate of an oxygen sensor and the platinum electrode, so as to solve the blockage of the platinum electrode layer in the existing technology, the poor adhesion of the ceramic sensing head substrate, and easy falling off. disadvantages

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