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Flat oxygen sensor and preparation method thereof

An oxygen sensor and flat-plate technology, which is applied in the field of flat-type oxygen sensor and its preparation, can solve the problems of low bending strength chip assembly yield, blockage of reference air channels, and high mass production costs, so as to prevent interlayer cracking, The effect of accelerating drying speed and improving production efficiency

Active Publication Date: 2012-07-25
WUXI LONGSHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional three-layer flat oxygen sensor, due to the existence of the reference cavity, is not suitable for isostatic pressing when the three layers are laminated, and can only be mechanically laminated after printing the adhesive between the layers. When closed, the cavity in the middle layer is easily deformed, blocking the reference air channel
The printing of the binder will cause the zirconia green ceramic sheet to shrink and deform during the drying process, which will affect the alignment accuracy of the upper, middle and lower layers
This kind of planar oxygen sensor process is complicated to copy and prepare, and the low bending strength of the chip leads to low chip assembly yield, short life, and high mass production cost.

Method used

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  • Flat oxygen sensor and preparation method thereof

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preparation example Construction

[0039] A method for preparing a flat oxygen sensor, comprising the steps of:

[0040] (1) Preparation of ceramic green sheets:

[0041] Select a specific surface area of ​​5-8m 2 / g, doped with 5%molY 2 o 3 Based on the quality of zirconia, add 16-22% organic solvent; 1-3% dispersant; 3-8% plasticizer; 3-10% binder ball milling and mixing 24 - After 30 hours, a uniform and stable casting slurry is obtained, and the casting slurry is prepared into a ceramic green sheet with a thickness of 0.2-0.25mm;

[0042] (2) Shaping of ceramic green sheets:

[0043] Punch a group of 2-4 circular holes with a diameter of 0.1-0.2mm on the first layer of ceramic green sheet 14 and the second layer of ceramic green sheet 15; the sixth layer of ceramic green sheet 19 and the seventh layer of ceramic green sheet 20 Two sets of 2-4 small circular holes with a diameter of 0.1-0.2 mm are punched up; a long groove with an open tail is laser cut in the middle of the third layer of ceramic green ...

Embodiment 1

[0051] Step 1: Preparation of Ceramic Green Sheets

[0052] A mixed solution of 80ml of ethanol and 80ml of toluene was used as an organic solvent; 15g of fish oil was added into a ball mill tank as a dispersant, and the three were stirred evenly with a polytetrafluoroethylene rod; 1Kg was weighed with a specific surface area of ​​5m 2 / g, doped with 5%molY 2 o 3 The superfine zirconia powder was added into the ball mill jar and milled for 10 hours; then 50g of polyethylene glycol was used as plasticizer; the mixture of 25g polyvinyl alcohol and 25g ethyl cellulose was added into the ball mill jar and ball milled for 14 hours . The mixed slurry was defoamed and cast into a ceramic green sheet with a thickness of 0.25 mm.

[0053] Step 2: Shape the ceramic green sheet

[0054] Punch a group of 4 small circular holes with a diameter of 0.2 mm on the first layer of ceramic green sheets and the second layer of ceramic green sheets. Two groups of 4 small circular holes with a ...

Embodiment 2

[0062] Step 1: Preparation of Ceramic Green Sheets

[0063] A mixed solution of 100ml ethanol and 100ml xylene was used as an organic solvent; 20g fish oil was added into a ball mill tank as a dispersant, and the three were stirred evenly with a polytetrafluoroethylene rod; 1Kg was weighed with a specific surface area of ​​6m 2 / g, doped with 5%molY 2 o 3 The ultra-fine zirconia powder was added into a ball mill jar and milled for 10 hours; then 60g of butyl phthalate was used as a plasticizer; 80g of polyvinyl butyral was added into a ball mill jar as a binder and ball milled for 16 hours. Degassing and casting the mixed slurry into a ceramic green sheet with a thickness of 0.25 mm;

[0064] Step 2: Shape the ceramic green sheet

[0065] Punch a group of 3 small circular holes with a diameter of 0.15 mm on the first layer of ceramic green sheets and the second layer of ceramic green sheets, and the 3 small holes are arranged symmetrically in a triangle and located in a cir...

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Abstract

The invention discloses a flat oxygen sensor and a preparation method thereof. The flat oxygen sensor comprises a sensor chip prepared by seven layers of zirconium oxide ceramic raw pieces which are 0.2 to 0.25 mm thick, wherein the chip sequentially comprises a signal functional layer consisting of the first and second layers of ceramic raw pieces, a reference channel functional layer consistingof the third, fourth and fifth layers of ceramic raw pieces and a heating functional layer consisting of the sixth and seventh layers of ceramic raw pieces; an outer electrode and a signal electrode pin are arranged on the upper surface of the first layer of ceramic raw piece; a porous protection layer is arranged on the outer electrode; a lead protection layer is arranged on the signal electrodepin; a reference electrode is arranged between the second and third layers of ceramic raw pieces; a heater is arranged between the fifth and sixth layers of ceramic raw pieces; an upper heater insulation layer and a lower heater insulation layer are arranged on and below heater respectively; and a heating electrode pin is connected to the heater. The preparation method comprises the following steps of preparing, forming, printing and stacking the ceramic raw pieces and sintering the sensor.

Description

technical field [0001] The present invention relates to a kind of automobile oxygen sensor chip structure and preparation method thereof, especially relate to a kind of 5%molY 2 o 3 Doped ZrO 2 A planar oxygen sensor with solid electrolyte and a preparation method thereof. Background technique [0002] The oxygen sensor is installed in the engine exhaust pipe or exhaust tailpipe to measure the remaining oxygen concentration in the engine exhaust. The engine ECU close-loop controls the air-fuel ratio of the engine combustion according to the signal provided by the oxygen sensor so that it reaches a constant 14.7. Therefore, the three-way catalyst can most effectively reduce the components of carbon monoxide, hydrocarbons, and nitrogen oxides in automobile exhaust, and convert the harmful gases in the exhaust into carbon dioxide, nitrogen, and water. [0003] The oxygen sensor is prepared by utilizing the high-temperature oxygen ion conduction characteristics of zirconia an...

Claims

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Application Information

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IPC IPC(8): G01N27/409
Inventor 尹亮亮倪铭王建邵兴隆张华
Owner WUXI LONGSHENG TECH
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