CN211741153U

CN211741153U - Embedded conductive platinum wire oxygen sensor

Info

Publication number: CN211741153U
Application number: CN202020175188.4U
Authority: CN
Inventors: 吴永文; 黄宗波; 刘超群
Original assignee: Shenzhen Ampron Technology Corp
Current assignee: Shenzhen Ampron Technology Corp
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2020-10-23
Anticipated expiration: 2030-02-14

Abstract

The utility model relates to an oxygen sensor field indicates an embedded conductive platinum silk oxygen sensor especially. The utility model discloses an embedded conductive platinum silk oxygen sensor, through directly imbedding the conductive platinum silk to the oxygen sensor ceramic body inside, the conductive platinum silk upper and lower face is through wrapping up the electrode parcel, can realize after the porcelain body stage is through isostatic pressing treatment that the conductive platinum silk is all wrapped up by the parcel electrode around, the reliability improves greatly, the life-span is also prolonged; in addition, the diameter of the conductive platinum wire is controlled to be 0.2-0.5mm, so that the conductive platinum wire has enough conductivity and enough strength to bear high-temperature thermal vibration.

Description

Embedded conductive platinum wire oxygen sensor

Technical Field

The utility model relates to an oxygen sensor field indicates an embedded conductive platinum silk oxygen sensor especially.

Background

The traditional oxygen sensor uses a contact electrode to transmit signals with an external terminal, and the traditional oxygen sensor vibrates violently for a long time in the working process, and the high temperature and the low temperature are alternated, so that poor contact between the contact electrode and the external terminal is easily caused, an output circuit is broken, and the product signals are abnormal.

Disclosure of Invention

In order to solve the problem, the utility model provides an embedded electrically conductive platinum silk oxygen sensor, direct with electrically conductive platinum silk embedded to oxygen sensor ceramic body inside, electrically conductive platinum silk upper and lower side is through the parcel electrode parcel, can realize after the isostatic pressing is handled in the raw porcelain body stage through the conducting platinum silk around being wrapped up by the parcel electrode is whole, the reliability improves greatly, the life-span also prolongs.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an embedded electrically conductive platinum silk oxygen sensor, is including overlapping alumina base body and the zirconia base body of establishing, the inside and outside surface of zirconia base body corresponds respectively to cover has interior signal electrode and outer signal electrode, the alumina base body embeds has and is used for giving zirconia base body, interior signal electrode and outer signal electrode heat transfer's heating electrode, the alumina base body embeds has down electrically conductive platinum silk, the upper and lower both sides of electrically conductive platinum silk are through wrapping up electrode parcel down, the zirconia base body is internal to be provided with electrically conductive platinum silk, the upper and lower both sides of going up electrically conductive platinum silk are through last parcel electrode parcel.

Further, zirconia base member is including the first zirconia base member, second zirconia base member, the third zirconia base member that stack in proper order, it is located to go up the parcel electrode between second zirconia base member, the third zirconia base member, interior signal electrode is located between first zirconia base member, the second zirconia base member.

The inner signal electrode and the upper wrapping electrode and the outer signal electrode and the upper wrapping electrode are communicated through a through hole respectively.

Further, the alumina substrate comprises a first alumina substrate and a second alumina substrate which are sequentially stacked, and the lower wrapping electrode and the heating electrode are positioned between the first alumina substrate and the second alumina substrate.

Furthermore, the zirconia matrix, the inner signal electrode, the outer signal electrode, the alumina matrix, the heating electrode, the upper conductive platinum wire and the lower conductive platinum wire are integrally formed.

Furthermore, the inner signal electrode and the outer signal electrode are both a layer of porous platinum film.

Wherein the diameters of the upper conductive platinum wire and the lower conductive platinum wire are 0.2-0.5 mm.

Wherein the diameters of the upper conductive platinum wire and the lower conductive platinum wire are 0.4 mm.

The beneficial effects of the utility model reside in that: the utility model discloses an embedded conductive platinum silk oxygen sensor, through directly imbedding the conductive platinum silk to the oxygen sensor ceramic body inside, the conductive platinum silk upper and lower face is through wrapping up the electrode parcel, can realize after the porcelain body stage is through isostatic pressing treatment that the conductive platinum silk is all wrapped up by the parcel electrode around, the reliability improves greatly, the life-span is also prolonged; in addition, the diameter of the conductive platinum wire is controlled to be 0.2-0.5mm, so that the conductive platinum wire has enough conductivity and enough strength to bear high-temperature thermal vibration.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is an exploded view of the present embodiment.

The reference numbers illustrate: 1. a zirconia matrix; 11. a first zirconia matrix; 12. a second zirconia base; 13. a third zirconia base; 2. an alumina matrix; 21. a first alumina matrix; 22. a second alumina substrate; 3. an inner signal electrode; 4. heating the electrode; 5. lower wrapping electrode; 6. a lower conductive platinum wire; 7. a via hole; 8. an outer signal electrode; 9. an electrode is wrapped on the upper part; 10. and (4) an upper conductive platinum wire.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, wherein words that indicate orientation, front, back, left, right, etc., are used solely for the purpose of illustrating the structure in the corresponding figures.

Referring to fig. 1-2, the present invention relates to an embedded conductive platinum wire oxygen sensor, which comprises an aluminum oxide substrate 2 and a zirconium oxide substrate 1 stacked together, wherein the inner and outer surfaces of the zirconium oxide substrate 1 are respectively covered with an inner signal electrode 3 and an outer signal electrode 8, the aluminum oxide substrate 2 is internally provided with a heating electrode 4 for transferring heat to the zirconium oxide substrate 1, the inner signal electrode 3 and the outer signal electrode 8, the aluminum oxide substrate 2 is internally provided with a lower conductive platinum wire 6, the upper and lower sides of the lower conductive platinum wire 6 are wrapped by a lower wrapping electrode 5, the zirconium oxide substrate 1 is internally provided with an upper conductive platinum wire 10, the upper and lower sides of the upper conductive platinum wire 10 are wrapped by an upper wrapping electrode 9, the upper and lower sides of the conductive platinum wire are directly embedded into the oxygen sensor ceramic body, the upper and lower sides of the conductive platinum wire are wrapped by wrapping electrodes, and the wrapped electrode can be wrapped around the conductive platinum wire after the ceramic body is subjected to isostatic pressing treatment, the reliability is greatly improved, and the service life is also prolonged.

Specifically, the zirconia base 1 of this embodiment includes a first zirconia base 11, a second zirconia base 12, and a third zirconia base 13 stacked in sequence, the upper package electrode 9 is located between the second zirconia base 12 and the third zirconia base 13, the inner signal electrode 3 is located between the first zirconia base 11 and the second zirconia base 12, the alumina base 2 includes a first alumina base 21 and a second alumina base 22 stacked in sequence, and the lower package electrode 5 and the heating electrode 4 are located between the first alumina base 21 and the second alumina base 22. The inner signal electrode 3 and the upper wrapping electrode 9, and the outer signal electrode 8 and the upper wrapping electrode 9 are respectively communicated through a via hole 7.

In this embodiment, a zirconia base 1, an inner signal electrode 3, an outer signal electrode 8, an alumina base 2, a heating electrode 4, an upper conductive platinum wire 10 and a lower conductive platinum wire 6 are integrally formed; in the embodiment, the zirconia substrate 1, the inner signal electrode 3, the outer signal electrode 8, the alumina substrate 2, the heating electrode 4, the upper conductive platinum wire 10 and the lower conductive platinum wire 6 are integrally sintered by adopting the processes of tape casting, screen printing, platinum wire filling, high-temperature sintering and the like and a multilayer ceramic high temperature co-firing (HTCC) technology, so that the production cost is low.

In this embodiment, the basic element of the oxygen sensor is a yttria-stabilized zirconia matrix 1, which is a solid electrolyte, the heating electrode 4 in the alumina matrix 2 is heated by external power supply, heat is transferred to the zirconia matrix 1 and the inner signal electrode 3 and the outer signal electrode 8, so that it reaches a normal operating temperature, the inner signal electrode 3 and the outer signal electrode 8 contact external oxygen, oxygen obtains electrons on the outer signal electrode 8 to ionize, the electrons penetrate into the solid electrolyte in the form of oxygen ions and migrate from the inner signal electrode 3 to the outer signal electrode 8, then electrons are given on the outer signal electrode 8 to generate oxygen, this process can rapidly reach electrochemical equilibrium, so as to generate an electromotive force E between the inner signal electrode 3 and the outer signal electrode 8, the electromotive force E is determined by an Nernst (Nernst) equation:

E＝(RT/4F)Ln(Pair/Pexh)

wherein, in the equation: t is the absolute temperature (K); r is a universal gas constant; r is 8.314J/mol.K; f is the faraday constant, F is 96500C · mol, Pair is the oxygen partial pressure in the atmosphere, and Pexh is the oxygen partial pressure in the exhaust.

In this embodiment, the inner signal electrode 3 and the outer signal electrode 8 are both a porous platinum film. In addition, the upper conductive platinum wire 10 and the lower conductive platinum wire 6 have a diameter of 0.2 to 0.5mm, preferably 0.3mm, so that they have sufficient conductivity while having sufficient strength to withstand thermal vibration at high temperature.

It should be further noted that the casting, screen printing, platinum wire filling, high temperature sintering and other processes and the multilayer ceramic high temperature co-firing (HTCC) technology mentioned in this embodiment belong to the conventional technologies in the art, and are not described herein again. Unless otherwise specifically stated or limited, the terms "connected," "fixed," and the like are to be construed broadly, and the specific meaning of the terms in the disclosure herein will be understood to those of ordinary skill in the art as appropriate.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by the technical solution of the present invention by those skilled in the art are all within the scope of the present invention as defined by the claims.

Claims

1. An embedded conductive platinum wire oxygen sensor is characterized in that: including the alumina base member and the zirconia base member of establishing of folding, the inside and outside surface of zirconia base member corresponds respectively to cover has interior signal electrode and outer signal electrode, the alumina base member embeds has and is used for giving zirconia base member, interior signal electrode and outer signal electrode heat transfer's heating electrode, the alumina base member embeds has down electrically conductive platinum silk, the upper and lower both sides of electrically conductive platinum silk are through wrapping up electrode parcel down, the zirconia base member is internal to be put and is had electrically conductive platinum silk, go up the upper and lower both sides of electrically conductive platinum silk and wrap up electrode parcel through last.

2. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the zirconia base body is including the first zirconia base body, second zirconia base body, the third zirconia base body that stack in proper order and establish, it is located to go up the parcel electrode between second zirconia base body, the third zirconia base body, interior signal electrode is located between first zirconia base body, the second zirconia base body.

3. The embedded conductive platinum wire oxygen sensor of claim 2, wherein: the inner signal electrode and the upper wrapping electrode and the outer signal electrode and the upper wrapping electrode are communicated through a through hole respectively.

4. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the aluminum oxide base body comprises a first aluminum oxide base body and a second aluminum oxide base body which are sequentially overlapped, and the lower wrapping electrode and the heating electrode are located between the first aluminum oxide base body and the second aluminum oxide base body.

5. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the zirconia matrix, the inner signal electrode, the outer signal electrode, the alumina matrix, the heating electrode, the upper conductive platinum wire and the lower conductive platinum wire are integrally formed.

6. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the inner signal electrode and the outer signal electrode are both a layer of porous platinum film.

7. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the diameters of the upper conductive platinum wire and the lower conductive platinum wire are 0.2-0.5 mm.

8. The embedded conductive platinum wire oxygen sensor of claim 1, wherein: the diameters of the upper conductive platinum wire and the lower conductive platinum wire are 0.4 mm.