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, short service life, poor thermal shock resistance and other problems of oxygen sensor, and achieve improved sensitivity, long service life and enhanced adhesion Effect

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

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Problems solved by technology

[0004] The invention solves the technical problems of low sensitivity, poor thermal s

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

Example Embodiment

[0025] The invention also provides a method for preparing a chip oxygen sensor, which includes the following steps:

[0026] 1) Coat the insulating layer slurry, electrode slurry, and insulating layer slurry on the heater substrate, drying, and form an insulating layer on the heater substrate to obtain the first layer; take a reference gas substrate as Second layer

[0027] 2) Screen printing the transition layer slurry on the oxygen measuring electrolyte layer to form the transition layer; the transition layer slurry contains zirconia, magnesia-aluminum spinel and the first pore former; screen printing the porous layer slurry, A porous layer is formed on the layer; the slurry of the porous layer contains zirconia, magnesium-aluminum spinel, precious metals and a second pore-forming agent; the third layer is obtained; the zirconia cast sheet is taken and laser punched to obtain a compact Layer, as the fourth layer;

[0028] 3) The side of the insulating layer of the first sheet is ...

Example Embodiment

[0041] Example 1

[0042] (1) The heater substrate, the reference gas substrate blank, and the zirconia electrolyte substrate are prepared by the tape casting process; the insulating layer, the heating electrode, and the insulating layer are successively coated by the screen printing process on the heater substrate. The heater substrate is used as the first layer; the reference gas substrate blank is made by laser cutting air channels to make the reference gas substrate, as the second layer; the electrode is printed on both sides of the zirconia electrolyte substrate to make the oxygen electrolyte Floor.

[0043] (2) Raw material preparation:

[0044] Transition layer slurry: (a) Powder material: 65 parts by weight of zirconia; 27 parts by weight of magnesium-aluminum spinel; 5 parts by weight of activated carbon (particle size 1.8-4μm) as a pore-forming agent; 3 parts by weight of sintering aid ( Among them, 1 part by weight of alumina, 1 part by weight of magnesium oxide, and 1 p...

Example Embodiment

[0049] Example 2

[0050] The chip oxygen sensor of this embodiment is prepared by the same method as in embodiment 1, except that: in step (4), the area of ​​the zirconia cast sheet is larger than the area of ​​the transition layer and the porous layer, and the porous layer is completely covered. Floor.

[0051] Through the above steps, the chip oxygen sensor of this embodiment is obtained, which has figure 1 The structure shown in which the porous protective layer has Figure 4 The structure shown is denoted as A2.

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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 a compact 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 transition layer contains zirconium oxide and magnesia alumina spinels, the average hole diameter of the transition layer ranges from 0.1 mu.m to 2.5 mu.m, and the porosity of the transition layer ranges from 20 percent to 40 percent; the porous layer contains zirconium oxide, magnesia alumina spinels and noble metal, the average hole diameter of the porous layer ranges from 0.1 mu.m to 3.5 mu.m, and the porosity of the porous layer ranges from 30 percent to 50 percent; and the compact layer contains zirconium oxide, the average hole diameter of the compact layer ranges from 2 mu.m to 3 mu.m, and the porosity of the compact layer ranges from 20 percent to 40 percent. 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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IPC IPC(8): G01N27/409B32B3/24
Inventor 徐斌王田军
Owner BYD CO LTD
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