Chemical plating solution for ZrO2 oxygen sensor electrode and preparation method and application of chemical plating solution

A technology of oxygen sensor and chemical plating solution, which is applied in the field of chemical plating solution of ZrO2 oxygen sensor electrode and its preparation, can solve problems such as difficult automation, achieve the effects of reducing time, reducing a large amount of use, and improving efficiency

Pending Publication Date: 2021-04-23
深圳聚德寿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special-shaped structure of the zirconium tube, it is difficult to realize automation by traditional brushing methods

Method used

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  • Chemical plating solution for ZrO2 oxygen sensor electrode and preparation method and application of chemical plating solution
  • Chemical plating solution for ZrO2 oxygen sensor electrode and preparation method and application of chemical plating solution
  • Chemical plating solution for ZrO2 oxygen sensor electrode and preparation method and application of chemical plating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Example 1: After pressing and molding zirconia powder with a purity of 99% 5YSZ, sintering at a temperature of 1400°C for 2 hours, sintering into a ceramic matrix, and using 0.1mol / L hydrofluoric acid solution to activate the ceramic matrix for 30 minutes Dry with circulating air at room temperature, put the ceramic substrate into the protective device, and then immerse it in 1g / L Na 2 Pt(OH) 6 After being immersed in the aqueous solution for 5 minutes, it was dried under the condition of circulating air at 40°C, then immersed in the aqueous solution of hydrazine monohydrate at a concentration of 0.05 g / L, and then dried under the condition of circulating air at 40°C to obtain an activated zirconia ceramic matrix;

[0045] Na with a purity of not less than 99% 2 Pt(OH) 6 Soluble in water, ethylenediamine as a complexing agent, dissolved in water, as solution A for electroless platinum plating; sodium hydroxide as a pH regulator, to ensure that the pH value is between 9...

Embodiment 2

[0050] Example 2: After pressing and molding zirconia powder with a purity of 99% 5YSZ, sintering at a temperature of 1400°C for 2 hours, sintering into a ceramic matrix, and using 0.1mol / L hydrofluoric acid solution to activate the ceramic matrix for 30 minutes Dry with circulating air at room temperature, put the ceramic substrate into the protective device, and then immerse it in 1g / L Na 2 Pt(OH) 6 After being immersed in the aqueous solution for 5 minutes, it was dried under the condition of circulating air at 40°C, then immersed in the aqueous solution of hydrazine monohydrate at a concentration of 0.05 g / L, and then dried under the condition of circulating air at 40°C to obtain an activated zirconia ceramic matrix;

[0051] Na with a purity of not less than 99% 2 Pt(OH) 6 、Na 2 PtCl 6 Dissolve in water after mixing at a ratio of 1:1. Diethylenetriamine is used as a complexing agent and dissolved in water as solution A for electroless platinum plating; sodium hydroxid...

Embodiment 3

[0056] Example 3: After pressing and molding zirconia powder with a purity of 99% 8YSZ, sintering at a temperature of 1450°C for 2 hours, sintering into a ceramic matrix, and using 0.05mol / L hydrofluoric acid solution to activate the ceramic matrix for 1.5h After drying with circulating air at room temperature, put the ceramic substrate into the protective device and immerse it in 1g / L Na 2 Pt(OH) 6 After being immersed in the aqueous solution for 5 minutes, it was dried under the condition of circulating air at 60°C, then immersed in the aqueous solution of hydrazine monohydrate at a concentration of 0.05 g / L, and then dried under the condition of circulating air at 60°C to obtain an activated zirconia ceramic matrix;

[0057] Na with a purity of not less than 99% 2 PtCl 6 Soluble in water, citric acid as a complexing agent, dissolved in water as solution A for electroless platinum plating; ammonia water as a pH regulator to ensure that the pH value is between 9-11, isonico...

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Abstract

The invention discloses a chemical plating solution for a ZrO2 oxygen sensor electrode and a preparation method and application of the chemical plating solution. The chemical plating solution comprises main salt, a reducing agent and a complexing agent, and the reducing agent comprises sodium borohydride and one or two of isonicotinic acid hydrazide or hydrazine monohydrate. The invention also provides a method for chemically plating a ZrO2 oxygen sensor electrode by using the chemical plating solution. Through the combined action of various reducing agents in the chemical plating solution, the chemical plating time is shortened, the efficiency is improved, and meanwhile, a chemical plating layer is uniform, so that the electrode performance can be ensured under the condition of low thickness, the use of a large amount of platinum is reduced, and the cost is reduced. Meanwhile, the invention further designs a protection device at the position except the position needing to be plated in the chemical plating process, and it is guaranteed that the electrode area of the plated ceramic part is controllable.

Description

technical field [0001] The invention relates to the field of manufacturing zirconium tubes in tubular oxygen sensors, in particular to a ZrO 2 An electroless plating solution for an oxygen sensor electrode, a preparation method and application thereof. Background technique [0002] ZrO 2 The core element of the oxygen sensor is porous ZrO 2 The ceramic tube is a solid electrolyte. The inner and outer sides of the zirconium tube are coated with platinum electrodes. The inner cavity of the tube is a reference channel. The outer wall of the tube is in contact with the exhaust gas. There is a heater inside the tube, and the sensor is heated by the heater to reach the working temperature. Utilizing the high-temperature oxygen ion conduction of YSZ solid electrolyte without electron conduction, the concentration difference potential is generated based on the difference in oxygen partial pressure on both sides of the YSZ solid electrolyte. Different concentration differences corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44
Inventor 于金营
Owner 深圳聚德寿科技有限公司
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