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Preparation method of ZrO2-based oxygen sensitive element co-sintering platinum electrode

A technology of sensitive components and platinum electrodes, which is applied in the field of electrode preparation, can solve the problems of blocking the catalytic active area of ​​platinum electrodes and reducing the catalytic activity of electrodes, and achieve high bonding strength, reduce the difference in thermal expansion coefficient, and avoid detachment

Pending Publication Date: 2019-11-05
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the amount of glass powder added is too large, the glass powder will melt at high temperature, which will block the catalytic active area of ​​the platinum electrode and reduce the catalytic activity of the electrode.

Method used

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  • Preparation method of ZrO2-based oxygen sensitive element co-sintering platinum electrode

Examples

Experimental program
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Effect test

preparation example Construction

[0032] ZrO of the present invention 2 The preparation method of the oxygen-based sensitive element co-sintered platinum electrode mainly includes the following steps:

[0033] S1. Preparation of ZrO 2 Base solid electrolyte blank;

[0034] S2. Prepare platinum electrode slurry; and

[0035] S3. Coating the platinum electrode slurry evenly on the ZrO 2 On the inner wall surface and outer wall surface of the base solid electrolyte blank, after drying at room temperature, the ZrO coated with platinum electrode slurry 2 The base solid electrolyte blank is sintered.

[0036] In step S1, ZrO 2 The preparation of the base solid electrolyte blank can adopt the cold isostatic pressing technology to compress 5mol%-8mol%Y 2 o 3 Doped ZrO 2 The powder is pressed into a tube to produce a tube blank. Among them, 5mol%-8mol%Y 2 o 3 Doped ZrO 2 The powder refers to the ZrO 2 The powder is doped with 5%-8% Y by mole 2 o 3 Powdered material.

[0037]In step S2, the preparation p...

experiment example 1

[0044] First, the preparation of the platinum electrode slurry is carried out: firstly, the metal oxide additives are prepared, respectively 10% Al by weight percentage 2 o 3 , 80% ZrO 2 Base solid electrolyte powder (6mol% Y 2 o 3 Doped ZrO 2 ) and 10% CaO to prepare metal oxide additives; then, according to weight percent, respectively 5% metal oxide additives, 10% methylcellulose, 8% eucalyptol, 10% terpineol and 67% of roughly spherical ultrafine platinum powder with a particle size of 1.0 μm is used for batching preparation, and metal oxide additives and ultrafine platinum powder are mixed and fully dispersed, and then methylcellulose, eucalyptol and pine Oleyl alcohol, ultrasonically disperse for 1.5h, or use a ball mill to grind for 10h to make a platinum electrode slurry.

[0045] Then, ZrO 2 Preparation of co-sintered platinum electrodes for oxygen-based sensitive elements: coating the prepared platinum electrode slurry on the prepared tubular ZrO 2 On the surf...

experiment example 2

[0048] First, the preparation of platinum electrode slurry is carried out: the metal oxide additives are prepared, respectively 13% Al by weight percentage 2 o 3 , 76% ZrO 2 Base solid electrolyte powder (6mol% Y 2 o 3 Doped ZrO 2 ) and 11% CaO to formulate metal oxide additives; then, according to weight percent, respectively 4.6% metal oxide additives, 6% epoxy resin, 10% castor oil fatty acid, 10% methyl ethyl ketone and The ratio of 69.4% of roughly spherical ultrafine platinum powder with a particle size of 1.5 μm is prepared for batching, and the metal oxide additive and ultrafine platinum powder are mixed and fully dispersed, and then epoxy resin, castor oil fatty acid and methyl Ethyl ketone, ultrasonically disperse for 1.5h, or use a ball mill to grind for 10h to make a platinum electrode slurry.

[0049] Then, ZrO 2 Preparation of co-sintered platinum electrodes for oxygen-based sensitive elements: coating the prepared platinum electrode slurry on the tubular Z...

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Abstract

The invention provides a preparation method of a ZrO2-based oxygen sensitive element co-sintering platinum electrode. The preparation method comprises the following steps that S1, a ZrO2-based solid electrolyte blank is prepared; S2, a platinum electrode slurry is prepared; S3, the surfaces of the inner and outer walls of the ZrO2-based solid electrolyte blank are evenly coated with the platinum electrode slurry, and after air-drying is conducted at the room temperature, the ZrO2-based solid electrolyte blank coated with the platinum electrode slurry is sintered. According to the preparation method of the ZrO2-based oxygen sensitive element co-sintering platinum electrode, a component identical to the ZrO2-based solid electrolyte blank material is added to the platinum electrode slurry, the difference of the blank material and the component in the slurry is reduced, and therefore the thermal expansion coefficient difference between the platinum electrode and a ZrO2-based oxygen sensitive element substrate is reduced, the attachment performance of the platinum electrode is improved, and the service life of a ZrO2-based oxygen sensitive element is prolonged.

Description

technical field [0001] The present invention relates to a kind of ZrO 2 The preparation method of the electrode of oxygen-based sensor, more specifically, relates to ZrO 2 The invention discloses a preparation method of a co-sintered platinum electrode of an oxygen sensitive element of a base oxygen sensor. Background technique [0002] ZrO 2 The oxygen sensor is based on ZrO 2 The oxygen-based sensor measures the oxygen potential in the gas to be measured or in a specific environment, and then calculates the oxygen content in it according to the Nernst equation. This sensor has been widely used in boiler combustion and automobile air-fuel ratio monitoring, which has played a role in saving energy. and protect the environment. And the performance of this oxygen sensor is similar to that of ZrO 2 It is closely related to the preparation method of the platinum electrode of the oxygen-based sensor. [0003] Currently, ZrO 2 There are two main preparation methods for the ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B41/88G01N27/30G01N27/406
CPCC04B35/48C04B41/88C04B2235/3208C04B2235/3217C04B2235/3225C04B2235/661G01N27/30G01N27/406
Inventor 向蓝翔李重黄继东高会玲丛中斗尹卫王维华贾铁军张谦
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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