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Chip type oxygen sensor and preparation method thereof

An oxygen sensor and chip technology, which is applied in the field of chip oxygen sensor and its preparation, can solve the problems of low sensitivity, poor thermal shock resistance, and short service life of the oxygen sensor, and achieve improved sensitivity, high thermal shock resistance, and use long life effect

Active Publication Date: 2011-06-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of low sensitivity, poor thermal shock resistance and short service life of the oxygen sensor existing in the prior art

Method used

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  • Chip type oxygen sensor and preparation method thereof
  • Chip type oxygen sensor and preparation method thereof
  • Chip type oxygen sensor and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] The present invention also provides a preparation method of a chip oxygen sensor, comprising the following steps:

[0029] 1) Coating insulating layer slurry, electrode slurry, and insulating layer slurry on the heater substrate, drying, forming an insulating layer on the heater substrate, and obtaining the first sheet; getting a reference gas substrate as second sheet;

[0030] 2) screen printing transition layer slurry on the oxygen measuring electrolyte layer to form a transition layer; screen printing porous layer slurry to form a porous layer on the transition layer; obtain the third sheet;

[0031] 3) One side of the insulating layer of the first sheet faces up, and one side of the porous layer of the third sheet faces up, and the first sheet, the second sheet, and the third sheet are stacked sequentially from bottom to top, Co-fire the stack at 1300-1600°C; obtain a co-fired body of the chip oxygen sensor;

[0032] 4) On the porous layer of the chip-type oxygen...

Embodiment 1

[0051] (1) The heater substrate, the reference gas substrate blank, and the zirconia electrolyte matrix are prepared by casting technology; the insulating layer, the heating electrode, and the insulating layer are successively coated on the heater substrate by a screen printing process. The heater substrate; the reference gas substrate blank adopts laser cutting to produce air channels to obtain the reference gas substrate; the upper electrodes are printed on both sides of the zirconia electrolyte substrate to obtain the oxygen measuring electrolyte layer.

[0052] (2) Raw material preparation: the particle size of the powder material is less than 2 μm, and the median diameter is 0.5-1.2 μm:

[0053] Transition layer: Transition layer powder material: Y-ZrO 2 92 parts by weight, MgAl 2 o 4 8 parts by weight; pore-forming agent (particle diameter<2 μm, median diameter: 0.6 μm): 0.4 parts by weight of starch, 0.8 parts by weight of high polymer ultrafine polyvinyl chloride, and ...

Embodiment 2-3

[0062] The same method as in Example 1 was used to prepare the chip oxygen sensor of this example, except that in step (2), the amount of slurry used and the components of the slurry were different, see Table 1 for details.

[0063] Through the above steps, the obtained chip oxygen sensors are sequentially recorded as A2-A3.

[0064] Table 1

[0065]

[0066]

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Abstract

The invention provides a chip type oxygen sensor and a preparation method thereof. A porous protection layer of the chip type oxygen sensor comprises a transition layer, a porous layer and an absorption layer; holes are formed on all the layers, so that the bottom of the porous protection layer is communicated with the top of the porous protection layer; the holes on the transition layer with thediameters ranging from 0.1mu.m to 1.5 mu.m account for above 80 percent of the total holes on the transition layer; the holes on the porous layer with the diameters ranging from 0.3 mu.m to 8 mu.m account for above 80 percent of the total holes on the porous layer; the holes on the absorption layer with the diameters ranging from 0.1 mu.m to 2 mu.m account for above 80 percent of the total holes on the absorption layer; the transition layer contains zirconium oxide with stable yttrium oxide and magnesia-alumina spinels; the porous layer contains zirconium oxide, magnesia-alumina spinels and noble metal; and the absorption layer contains magnesium oxide, calcium oxide, aluminum oxide, magnesium sulfate and barium oxide. Compared with the prior art, the chip type oxygen sensor has the advantages of high sensitivity and thermal shock resistance and long service life.

Description

technical field [0001] The invention relates to the field of automobile oxygen sensors, in particular to a chip oxygen sensor and a preparation method thereof. Background technique [0002] The oxygen sensor is used to detect the oxygen content in the exhaust gas exhausted by the engine. The flat-plate automotive zirconia oxygen sensor has the advantages of small size, fast response, low energy consumption, easy integrated heating and stable operation. During use, gasoline and engine oil contain lead, sulfur, phosphorus and other impurities, which will greatly reduce the performance of the sensor, while dust, oil, silicon and other components will block the protective layer and electrodes of the sensor, and lose the three-phase electrode reaction. The interface slows down the response speed of the oxygen sensor, and the signal output is insensitive, that is, the electrode is poisoned. In order to prevent electrode failure, the following two measures are generally adopted at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407
Inventor 王田军徐斌
Owner BYD CO LTD
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