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Method for manufacturing material for oxygen gas sensor

An oxygen sensor and anodic oxidation technology, which is used in the analysis of materials, electrochemical variables of materials, and material analysis by electromagnetic means, can solve the problems of complex process, high production cost, low production efficiency, etc., and achieves improved sensitivity and low cost. , the effect of simple structure

Active Publication Date: 2011-05-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to make nano-materials for automobile exhaust sensor materials separately, and then make them into composite materials. The process is complicated, the production efficiency is low, and the production cost is high.

Method used

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  • Method for manufacturing material for oxygen gas sensor
  • Method for manufacturing material for oxygen gas sensor
  • Method for manufacturing material for oxygen gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take a 200×30×2 (mm) pure titanium sheet, soak it in a 3% by weight hydrofluoric acid solution for 10 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0031] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 20% ​​by weight of sodium phosphate and 0.5% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 70°C, the oxidation voltage is 80V and stirring Electrochemical anodic oxidation was carried out for 15 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. A scanning electron microscope (SEM) picture of the obtained material is shown in FIG. 2 , and a transmission electron microscope (TEM) picture thereof is shown in FIG. 3 . From the transmission electron microscope photos, it can be seen that about 70% of the TiO on the surface of the film 2 The ...

Embodiment 2

[0034] Take a 200×30×2 (mm) pure titanium sheet, soak it in a 5% by weight hydrofluoric acid solution for 6 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0035] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 25% by weight of sodium phosphate and 0.7% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 80°C, the oxidation voltage is 70V and stirring Electrochemical anodic oxidation was carried out for 10 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. From the transmission electron microscope photos, it can be seen that about 60% of the TiO on the surface of the film 2It is a crystalline state, and the average grain size of the film can be calculated as 22.75nm by using Scherrer's formula to calculate the grain size of the film. The content of Pt...

Embodiment 3

[0038] Take a 200×30×2 (mm) pure titanium sheet, soak it in 4% by weight hydrofluoric acid solution for 8 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0039] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 15% by weight of sodium phosphate and 0.5% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 80°C, the oxidation voltage is 85V and stirring Electrochemical anodic oxidation was carried out for 18 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. From the transmission electron microscope photos, it can be seen that about 60% of the TiO on the surface of the film 2 It is a crystalline state, and the average grain size of the film can be calculated as 17.67nm by using Scherrer's formula to calculate the grain size of the film. The content of Pt ...

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Abstract

The present invention relates to oxygen senor material, a method to produce the material and an engine oxygen sensor made from the material. The material for the engine oxygen sensor comprises a titanium substrate and a TiO2 thin film formed through in situ anode oxidation method. The material production method includes steps below: (1) A titanium plate as the substrate is processed with 2% to 6% acid solution to remove oxide on surfaces of the titanium plate; (2) Taking the processed titanium plate as an anode and black lead as an cathode, electrochemical anode oxidation is realized with 10% to 30% sodium phosphate as basic electrolytes to form the TiO2 thin film on the titanium plate surface. In addition, the engine oxygen sensor is characterized in that its material comprises a titanium and TiO2 thin films formed through in situ anode oxidation method on the substrate surface. Moreover, the material of the engine oxygen sensor can remarkably improve oxygen sensitivity performance of the sensor, lower response time and enhance sensitivity of the sensor.

Description

[0001] This application is a divisional application of a Chinese invention patent application with the application number 200410088612.7 and the filing date of November 5, 2004, entitled "Oxygen Sensor Material, Its Preparation Method, and Engine Oxygen Sensor". technical field [0002] The invention relates to a material for an oxygen sensor, a preparation method thereof and an engine oxygen sensor made of the material. Background technique [0003] At present, the oxygen sensor materials used in automobiles to control exhaust emissions mainly include ZrO 2 and TiO 2 Both of them have the disadvantages of high temperature coefficient and poor stability. The semiconductor oxygen sensor has the characteristics of no gas reference electrode, small size, simple structure, low cost, and easy integrated production. It is more and more widely used in automobiles. As a material for semiconductor oxygen sensors, TiO 2 Has high oxygen-sensitivity properties, but studies have shown...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00G01N27/30G01N27/409
Inventor 肖美群
Owner BYD CO LTD