CN103217469A - Tubular automotive oxygen sensor structure and manufacturing method thereof - Google Patents

Abstract

The invention discloses a tubular automotive oxygen sensor structure and a manufacturing method thereof. According to the invention, zirconium oxide powder with 3%mol of Y2O3 and zirconium oxide powder with 5%mol of Y2O3 are respectively prepared through spray granulation; 1-5% of Al2O3 is added to the zirconium oxide powder with 3%mol of Y2O3, such that the thermal expansion coefficient is regulated; according to tubular automotive oxygen sensor head volume and product density, the amount of zirconium oxide powder with 5%mol of Y2O3 to be added into the head is calculated; and the zirconium oxide powder with 5%mol of Y2O3 with the amount is added to a head of a mold; the zirconium oxide powder with 3%mol of Y2O3 comprising Al2O3 is added, until a powder amount required by tube body is reached; isostatic pressing is carried out with rubber mold, wherein isostatic pressure is 150-160MPa; demolding and numerical control processing are carried out, until a designed size is reached; de-binding sintering is carried out, wherein a sintering temperature is 1350-1500 DEG C. The product provided by the invention has good electrical performance, good mechanical performance, and low cost.

Description

A kind of tubular type automotive oxygen sensor structure and preparation method thereof

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Technical field

 

The present invention relates to a kind of tubular type automotive oxygen sensor, relating in particular to a kind of is electrolytical tubular type automotive oxygen sensor structure and preparation method thereof with the stabilized with yttrium oxide zirconium dioxide, is applied to automobile electronic fuel oil jet system exhaust emissions control field.

 

Background technology

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The tubular type lambda sensor adopts global formation fabrication techniques zirconium pipe always traditionally, methods such as dry-pressing and injection moulding are arranged, there is the insider to recognize the requirement that reduces cost recently, as described in the patent No. 201210062893.3, describe a kind of ectonexine and adopted different materials, the method that replaces ZrO2 to reduce cost with part A l2O3, this method inevitably brings the performance of lambda sensor electric signal to descend, the coupling of unlike material is bad simultaneously also can influence yield rate, therefore need find the new method of balance between performance and cost.

 

Summary of the invention

 

Adopt the tubular type lambda sensor of the Zirconium powder material of single component, if with the zirconia that contains 3%mol Y2O3 (hereinafter to be referred as 3Y) intensity better and the electric conductivity deficiency, otherwise with the zirconia (hereinafter to be referred as 5Y) of 5%mol Y2O3 then electric conductivity better and undercapacity and cost are higher, the present invention aims to provide structure of the compound tubular type automotive oxygen sensor of a kind of two kinds of powders and preparation method thereof.

Technical scheme of the present invention is achieved in that

A kind of tubular type automotive oxygen sensor structure is provided, comprises a tubulose lambda sensor, it is characterized in that: the head of described tubulose lambda sensor is made with the powder of 5Y, and the pipe shaft of described tubulose lambda sensor is made with the powder of 3Y; But this technical scheme implementation structure and performance optimization and reduce cost.

For making above-mentioned tubular type automotive oxygen sensor, a kind of method for making of tubular type automotive oxygen sensor is provided, its technical scheme is as follows:

A kind of method for making of tubular type automotive oxygen sensor is provided, it is characterized in that: it may further comprise the steps:

1. mist projection granulating and prepare the powder of 3Y and 5Y respectively in the powder of 3Y, adds 1% to 5% Al2O3 powder and regulates its thermal expansivity;

2. referring to illustrated in figures 1 and 2, should add the amount of 5Y powder according to the density calculation head of the volume of tubulose lambda sensor head and product, and add the head of the powder of 5Y earlier to mould according to this amount;

3. add and contain the 3Y powder of Al2O3 powder to the required powder amount of pipe shaft;

4. the band rubber pattern waits static pressure together, and hydrostatic pressure is at 150 Mpa to 160Mpa, and demoulding digital control processing is carried out the binder removal sintering to design size then, and sintering temperature is between 1350 ℃ to 1500 ℃;

5. zirconium wicking surface quality and the impermeability thereof behind the inspection sintering coated internal and external electrode then, makes the tubular type lambda sensor.

After described tubulose lambda sensor completes, measure whether conformance with standard of tube wall internal resistance under its hot conditions and the electromotive force signal value under the combustion gas condition; Check certified products warehouse-in.

The product that this invention is made has good electrical properties and mechanical property, and is with low cost.

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Description of drawings

 

Fig. 1 is the structural representation of tubular type lambda sensor zirconium pipe among the present invention;

Fig. 2 is a kind of isostatic tooling synoptic diagram that adopts among the present invention;

Fig. 3 is sintering curre figure of the present invention.

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Embodiment

 

Following structure accompanying drawing is described embodiments of the invention, but is not limited to following examples:

A kind of tubular type automotive oxygen sensor structure is provided, comprises a tubulose lambda sensor, the head of described tubulose lambda sensor is made with the powder of 5Y, and the pipe shaft of described tubulose lambda sensor is made with the powder of 3Y.

Making above-mentioned tubular type automotive oxygen sensor may further comprise the steps:

1. adopt the powder of 3Y and 5Y to carry out mist projection granulating respectively, in the powder of 3Y, the Al2O3 powder of interpolation 1% to 5% is regulated its thermal expansivity between the setting district;

2. referring to illustrated in figures 1 and 2, should add the amount of 5Y powder according to the density calculation head of the volume of tubulose lambda sensor head and product, about 2 gram powders, and add the head of the powder of 5Y earlier to mould according to this amount;

3. adding the 3Y powder 3 that contains the Al2O3 powder restrains to the required powder amount of pipe shaft;

4. referring to shown in Figure 3, the band rubber pattern waits static pressure together, and hydrostatic pressure is at 150 Mpa to 160Mpa, and demoulding digital control processing is carried out the binder removal sintering to the drawing design size then, and sintering temperature is between 1350 ℃ to 1500 ℃;

5. the zirconium core behind the sintering is observed the surface quality flawless earlier, no gas leak phenomenon, illustrate that the 3Y powder proportioning of regulating thermal expansivity is suitable, coat internal and external electrode then, dressing up lambda sensor tests, measure the electromotive force signal value of (spirit lamp flame) under the tube wall internal resistance of (putting electric rangette top, 1kw laboratory) under the hot conditions and the combustion gas condition, contrast the data such as the following table of pure 3Y powder or 5Y powder:

The comparison of internal resistance of table 1. tube wall and electromotive force signal value

?	3Y	5Y	The present invention
				The tube wall internal resistance	800 Europe-1 kilo-ohm	Europe, 700 Europe-600	Europe, 600 Europe-500
The electromotive force value	600mV-800mV	750mV-850mV	850mV-950mV

Though above shown detailed embodiment of the present invention; those skilled in the art is under the prerequisite of essence of the present invention; the content of mentioning in description above and the accompanying drawing is the illustration of property as an illustration only; be not to be limitation of the present invention; have a kind of tubular type automotive oxygen sensor structure of above-mentioned technical characterictic and preparation method thereof, all fall into protection domain of the present invention.

Claims (2)

1. a tubular type automotive oxygen sensor structure comprises a tubulose lambda sensor, and it is characterized in that: the head of described tubulose lambda sensor is made with the powder of 5Y, and the pipe shaft of described tubulose lambda sensor is made with the powder of 3Y.

2. the method for making of a tubular type automotive oxygen sensor, it is characterized in that: it may further comprise the steps:

1. mist projection granulating and prepare the powder of 3Y and 5Y respectively in the powder of 3Y, adds 1% to 5% Al2O3 powder and regulates its thermal expansivity;

2. the amount that should add the 5Y powder according to the density calculation head of the volume of tubulose lambda sensor head and product, and add the head of the powder of 5Y earlier to mould according to this amount;

3. add and contain the 3Y powder of Al2O3 powder to the required powder amount of pipe shaft;

4. the band rubber pattern waits static pressure together, and hydrostatic pressure is at 150 Mpa to 160Mpa, and demoulding digital control processing is carried out the binder removal sintering to design size then, and sintering temperature is between 1350 ℃ to 1500 ℃;

5. zirconium wicking surface quality and the impermeability thereof behind the inspection sintering coated internal and external electrode then, makes the tubular type lambda sensor.

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