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Process for preparing air/fuel ratio thick-film sensor with wide temp range and narrow resistance band

A technology of sensors and stop bands, which is applied in the field of preparation of sensors for air/fuel ratio control, can solve the problems of high heating temperature, difficulty in ensuring performance, and high manufacturing cost, and achieve the effects of reducing manufacturing costs, improving performance, and improving control effects

Inactive Publication Date: 2002-02-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on IBMD method has been carried out recently, but due to the high preparation cost, difficult performance guarantee, high heating temperature and other problems, it has not been popularized.
However, with the increase in the number of automobiles, urban air pollution mainly comes from the emission of automobile exhaust. When the air / fuel ratio of various combustion equipment, appliances and automobile engines is improper, on the one hand, a large amount of harmful gases will be emitted, polluting the environment; on the other hand Energy can not be fully utilized, resulting in waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: to component is 0.63TiO 2 +0.2SnO 2 +0.05Nb 2 o 5 +0.12Bi2O 3 After the ceramic powder sample reagent is ground and made into a billet, it is fired at 1000°C for 30 minutes to make a sensitive powder paste for printing; after screen-printing interdigitated electrodes on an alumina substrate, it is fired at 800°C for 20 minutes ; After printing the sensitive powder paste with screen printing, place it at 1000°C for 1 hour and control the cooling rate at 120°C per minute to cool the sample to make a sensitive element; The leading end of the interdigitated electrode of the component is welded, placed at 800 ° C for 10 minutes, and the sample is cooled naturally; the heater paste is screen-printed on the back of the sensitive element, and placed at 650 ° C for half an hour; dipped in 10% Catalyst PdCl 2 After the solution, it was burned at 700°C for 30 minutes.

[0014] The prepared sample is in an oxidizing atmosphere: within 250°C-800°C, the resistance...

Embodiment 2

[0016] Embodiment 2: to component is 0.63TiO 2 +0.2SnO 2 +0.05Nb 2 o 5 +0.12 Bi 2 o 3 After the ceramic powder sample reagent is ground and made into a blank, it is burned at 1350 ° C for 4 hours, and after fine powder is mixed with 20%wt medium temperature glass powder to make a sensitive powder paste for printing; it is screen printed on an alumina substrate. After the interdigitated electrode, put it at 1000°C for 1 hour; then use the screen printing sensitive powder paste, put it at 1350°C for 2 hours, control the cooling rate at 180°C per minute, let the sample cool down, and make Sensitive element; then use platinum paste to melt the platinum wire and the interdigital electrode lead-out end of the sensitive element, and place it at 1000°C for 20 minutes to let the sample cool naturally; screen-print the heater paste on the back of the sensitive element, and place it side by side Burn at 850°C for 10 minutes; apply 30% catalyst H 4 PtCl 2 After the solution, put it...

Embodiment 3

[0019] Embodiment 3: to component is 0.63TiO 2 +0.2SnO 2 +0.05 Nb 2 o 5 +0.12 Bi 2 o 3 After the porcelain powder sample reagent is ground and crushed, it is placed at 1150 ° C for 2 hours, finely powdered and mixed with 10% wt medium temperature glass powder to make a sensitive powder paste for printing; screen printing on an alumina substrate After forming the interdigitated electrodes, place them at 900°C for 40 minutes; then print the sensitive powder paste with screen printing, place them at 1150°C for 1.5 hours, and control the cooling rate at 150°C per minute to cool the samples. into a sensitive element; then use platinum paste to melt the platinum wire and the interdigitated electrode lead-out end of the sensitive element, and place it at 900 ° C for 15 minutes to let the sample cool naturally; screen-print the heater paste on the back of the sensitive element, and Burn at 700°C for 45 minutes; after coating with 50% catalyst salt PdCl2 solution, burn at 900°C fo...

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Abstract

An air / fuel ratio sensor with wide temp range and narrow resistance band and its preparing process are disclosed. The rutile-type TiO2 structure is used for internal N-type doping and the P-type complex diffusion is performed to crystal interface. As a result, the electric conductivity of specimen is sharply lowered in oxidizing atmosphere, or sharply raised in reducing atmosphere. The thick film technology is used to make the specimen have 1-3 orders of magnitude of resistance difference in 250-800 deg.C. Its advantages are greatly improved performance and low cost.

Description

1. Technical field [0001] The invention relates to an air / fuel ratio control sensor, and further relates to a preparation method of the sensor for air / fuel ratio control of various engines, combustion equipment and appliances. 2. Background technology [0002] Sensors for air-fuel ratio control have appeared on the market with ZrO 2 Concentration battery type, TiO 2 And other oxide single-phase mixed resistance type. ZrO 2 The concentration battery type has the problems of lead poisoning, structural phase change and high price in the range of room temperature to 800 °C, and has the disadvantages of early failure and high cost in use. For this reason, the TiO 2 And other oxide single-phase mixed resistance sensors have been studied a lot, because in the wide temperature range from room temperature to 800 ° C: (1) wide resistance band, high resistance state in the reduced state; (2) short life ; (3) Shortcomings such as complex signal circuit. So it has not been put into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F23D14/60G01N27/406G01N27/407H10N99/00
Inventor 袁战恒武明堂
Owner XI AN JIAOTONG UNIV
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