CN211697633U - Split structural type oxygen sensor - Google Patents
Split structural type oxygen sensor Download PDFInfo
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- CN211697633U CN211697633U CN202020184323.1U CN202020184323U CN211697633U CN 211697633 U CN211697633 U CN 211697633U CN 202020184323 U CN202020184323 U CN 202020184323U CN 211697633 U CN211697633 U CN 211697633U
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Abstract
The application provides a components of a whole that can function independently structural formula oxygen sensor uses the oxygen sensor that zirconia base signal layer, aluminium oxide base zone of heating and retaining ring structure made, has changed the inside structure of directly filling the aluminium oxide of traditional integral type zirconia base, effectively disappears the internal stress of oxygen sensor heating-cooling cycle product, avoids the production of oxygen sensor crackle in the use, has the advantage that preparation simple process, uniformity are good, the reliability is high, long service life.
Description
Technical Field
The utility model relates to an oxygen sensor field indicates a components of a whole that can function independently structural formula oxygen sensor especially.
Background
The oxygen sensor is an important component in an engine management system, is arranged in an exhaust system and is used for sensing oxygen concentration and realizing closed-loop control. The mounting position of the oxygen sensor determines that the oxygen sensor is subjected to high vibration stress and high temperature stress in the service life. The core elements of the oxygen sensor are a zirconia-based heater and a zirconia-based heater, and in the traditional oxygen sensor, an alumina structure is filled in the zirconia-based heater and is directly heated; because of the internal stress generated by the traditional oxygen sensor in a heating-cooling circulating product, the strength of a zirconia matrix can be reduced (embrittled) and the zirconia matrix is easy to break in the using process, so that the oxygen sensor is inaccurate in transmission and can not work normally seriously.
Disclosure of Invention
In order to solve the problems, the utility model provides a components of a whole that can function independently structural formula oxygen sensor effectively eliminates the internal stress of oxygen sensor heater heating-cooling circulation product, avoids the production of heater crackle in the use, has the advantage that preparation simple process, uniformity are good, the reliability is high, long service life.
In order to achieve the above object, the utility model adopts the following technical scheme: a split structure type oxygen sensor comprises a zirconia-based signal layer, an alumina-based heating layer, a fixing ring and a bonding glass glaze, wherein the alumina-based heating layer comprises an alumina base, a heating electrode arranged in the alumina base, and a first contact electrode arranged on the outer side surface of the alumina base and electrically connected with the heating electrode; the zirconia-based signal layer comprises a zirconia matrix, an outer signal electrode, an inner signal electrode and a second contact electrode, wherein an air cavity channel communicated with the outside is formed in the zirconia matrix along the length direction of the zirconia matrix, the outer signal electrode is arranged on the outer side surface of the zirconia matrix, the inner signal electrode is arranged on the inner wall, close to the outer signal electrode, of the air cavity channel, and the outer signal electrode and the inner signal electrode are both electrically connected with the second contact electrode arranged on the outer side surface of the zirconia matrix; the inner side surface of the zirconia matrix is connected with the inner side surface of the alumina matrix through bonding glass glaze, the fixing ring is sleeved on the outer side surfaces of the zirconia matrix and the alumina matrix, and the bonding glass glaze is arranged at the joint of the fixing ring and the zirconia matrix and the joint of the fixing ring and the alumina matrix.
Further, the heating electrode is embedded in the alumina matrix and extends along the length direction of the alumina matrix.
The zirconia-based signal layer further comprises a first connecting pole piece arranged on the outer side surface of the zirconia-based body and a second connecting pole piece arranged on the inner wall of the air cavity close to the outer signal electrode, wherein the zirconia-based body is provided with a first through hole for communicating the outer side surface of the zirconia-based body with the air cavity, and the inner wall of the first through hole is coated with first conductive platinum slurry; one end of the second connection pole piece is electrically connected with the inner signal pole piece, the other end of the second connection pole piece is electrically connected with the first conductive platinum paste in the first through hole, the outer signal pole piece is electrically connected with one end of the second contact electrode through the first connection pole piece, and the other end of the second contact electrode is electrically connected with the first conductive platinum paste in the first through hole.
Furthermore, a second through hole is formed in the alumina substrate, and second conductive platinum slurry is coated on the inner wall of the alumina substrate; wherein the heating pole piece is electrically connected with the first contact electrode through the second conductive platinum paste.
Further, the diameter of the second via hole is 0.1 to 1.0 mm.
Further, the thickness of the bonding glass glaze between the inner side surface of the zirconia base and the inner side surface of the alumina base is 1 to 100 μm.
The beneficial effects of the utility model reside in that: the oxygen sensor made by the zirconia-based signal layer, the alumina-based heating layer and the fixed ring structure changes the structure of directly filling alumina in the traditional integrated zirconia-based structure, effectively eliminates the internal stress of a heating-cooling circulating product of the oxygen sensor, avoids the generation of cracks of the oxygen sensor in the use process, and has the advantages of simple manufacturing process, good consistency, high reliability and long service life.
Drawings
FIG. 1 is a schematic longitudinal sectional view of a medium oxygen sensor according to the present invention.
Fig. 2 is a side view of the oxygen sensor of the present invention.
Fig. 3 is a plan view of the oxygen sensor of the present invention.
Fig. 4 is a schematic structural view of the fixing ring of the present invention.
The reference numbers illustrate: 10. a zirconia-based signal layer; 20. an alumina-based heating layer; 11. an outer signal electrode; an inner signal electrode; 2. a zirconia matrix; 31. a first via hole; 32. a second via hole; 41. a first contact electrode; 42. a second contact electrode; 43. a first connection pole piece; 44. a second connection pole piece; 5. an air cavity; 6, bonding glass glaze; 7. a fixing ring; 8. heating the pole piece; 9. an alumina matrix.
Detailed Description
Referring to fig. 1-4, the present invention relates to a split structure type oxygen sensor, which comprises a zirconia-based signal layer 10, an alumina-based heating layer 20, a fixing ring 7, and a bonding glass glaze 6, wherein the alumina-based heating layer 20 comprises an alumina substrate 9, a heating electrode embedded in the alumina substrate 9, and a first contact electrode 41 disposed on an outer side surface of the alumina substrate 9 and electrically connected to the heating electrode; the zirconia-based signal layer 10 comprises a zirconia base body 2, an outer signal electrode 11, an inner signal electrode 12 and a second contact electrode 42, wherein an air cavity channel 5 communicated with the outside is formed in the zirconia base body 2 along the length direction of the zirconia base body, the outer signal electrode 11 is arranged on the outer side surface of the zirconia base body 2, the inner signal electrode 12 is arranged on the inner wall, close to the outer signal electrode 11, of the air cavity channel 5, and the outer signal electrode 11 and the inner signal electrode 12 are both electrically connected with the second contact electrode 42 arranged on the outer side surface of the zirconia base body 2; the inner side surface of the zirconia matrix 2 is connected with the inner side surface of the alumina matrix 9 through a bonding glass glaze 6, the fixing ring 7 is sleeved on the outer side surfaces of the zirconia matrix 2 and the alumina matrix 9, and the bonding glass glaze 6 is arranged at the joint of the fixing ring 7 and the zirconia matrix 2 and the joint of the fixing ring 7 and the alumina matrix 9.
The oxygen sensor is made by using the structures of the zirconia-based signal layer 10, the alumina-based heating layer 20 and the fixing ring 7, the structure that the alumina is filled in the traditional integrated zirconia-based structure is changed, the internal stress of a heating-cooling circulating product of the oxygen sensor is effectively eliminated, the generation of cracks of the oxygen sensor in the use process is avoided, and the oxygen sensor has the advantages of simple manufacturing process, good consistency, high reliability and long service life.
The following detailed discussion relates to the compositional make-up and action of the various components:
1. outer signal electrode 11, inner signal electrode 12: in this embodiment, the structure and material of the outer signal electrode 11 and the inner signal electrode 12 are the same, and are made of 20-40 wt.% of platinum powder and 40-80 wt.% of zirconia powder through burdening and ball milling, and the electrode is a porous catalytic electrode capable of catalyzing oxygen at high temperature.
2. Zirconia matrix 2: the material is prepared by a ball milling process from an yttrium-stabilized zirconia material, and the proportion of the yttrium-stabilized zirconia material is 90-99 wt.% of YSZ (yttrium-stabilized zirconia) and 1-9 wt.% of pure alumina, wherein the zirconia is a solid electrolyte at high temperature and has the function of gas-oxygen ion migration; the purity of the alumina is 99.999 percent, and the agglomeration of silicon element in the zirconia material can be prevented, so that the effect of reducing the conductivity of the zirconia by the silicon element is avoided, and the strength of the zirconia matrix 2 can be enhanced.
3. First contact electrode 41, second contact electrode 42: in this embodiment, the first contact electrode 41 and the second contact electrode 42 are made of platinum powder with a purity of 99-99.999 wt.%, and the first contact electrode 41 is connected to an external lead for inputting a heating signal, and the second contact electrode 42 is connected to an external lead for outputting a signal.
4. Air channel 5: the reference air is provided so that the oxygen sensor can obtain a normal output waveform.
5. Bonding glass glaze 6: is made of high-temperature glass powder and plays the role of bonding and fixing the fixing ring 7, the zirconia-based signal layer 10 and the alumina-based heating layer 20.
6. Fixing ring 7: is made of alumina powder with a purity of 95-99.999 wt.% and functions as a fixed zirconia-based signal layer 10 and an alumina-based heating layer 20.
7. Heating an electrode: the oxygen sensor is made of platinum powder with the purity of 99-99.999 wt.%, and can generate heat under the condition of 5-14V of electrification, so that the oxygen sensor reaches the working temperature of 500-800 ℃.
8. Alumina matrix 9: the high-temperature-resistant zirconium oxide ceramic is prepared from an aluminum oxide material with the purity of 99-99.99999 wt.% by a ball milling process, the aluminum oxide is a material with excellent high-temperature insulation, the heater electrode can be well insulated and protected, and meanwhile, the voltage applied to the heater electrode in the working process can be prevented from flowing into a zirconium oxide substrate 2, so that the zirconium oxide is subjected to a metallization reaction, and the metallization reaction formula is as follows:
ZrO2+4e--→Zr+2O2-
reaction of the metallization resulting in a portion of ZrO in the zirconia2When the oxygen ion generating metal is exfoliated, the volume is reduced (by about 30%) and the zirconia matrix 2 is poor in strength (embrittled) and is easily broken when the volume is different from that of the surrounding zirconia.
Further, the heating electrode is built in the alumina substrate 9 and extends in the length direction of the alumina substrate 9. In this embodiment, the heating electrode extends along the length direction of the alumina substrate 9 to ensure uniform heating of the zirconia substrate 2, so that the oxygen sensor reaches the operating temperature of 500-800 ℃.
Further, the zirconia-based signal layer 10 further includes a first connecting pole piece 43 disposed on the outer side surface of the zirconia base body 2, and a second connecting pole piece 44 disposed on the inner wall of the air cavity 5 near the outer signal electrode 11, wherein the zirconia base body 2 is provided with a first via hole 31 communicating the outer side surface of the zirconia base body 2 with the air cavity 5, and the inner wall of the first via hole 31 is coated with a first conductive platinum paste; one end of the second connection pole piece 44 is electrically connected to the inner signal pole piece, the other end of the second connection pole piece 44 is electrically connected to the first conductive platinum paste in the first via hole 31, the outer signal pole piece is electrically connected to one end of the second contact electrode 42 through the first connection pole piece 43, and the other end of the second contact electrode 42 is electrically connected to the first conductive platinum paste in the first via hole 31. Further, the alumina base 9 is provided with a second via hole 32, and the inner wall is coated with a second conductive platinum paste; wherein the heating electrode plate 8 is electrically connected with the first contact electrode 41 through the second conductive platinum paste. Further, the diameter of the second via hole 32 is 0.1 to 1.0 mm.
In this embodiment, the first via hole 31 and the second via hole 32 have the same structure, and the first conductive platinum paste and the second conductive platinum paste have the same composition ratio, wherein the first via hole 31 and the second via hole 32 are through holes with a diameter of 0.1-1.0mm, and the first conductive platinum paste serves to connect the external signal electrode 11 and the internal signal electrode 12; the second conductive platinum paste plays a role in connecting the first contact electrode 41 and heating the pole piece 8;
the working principle of the oxygen sensor is explained as follows:
the basic element of the oxygen sensor is a yttria-stabilized zirconia matrix 2, which is a solid electrolyte whose inner and outer surfaces are covered with a porous platinum film as electrodes, i.e., an outer signal electrode 11 and an inner signal electrode 12. The alumina-based heating layer 20 is powered by the outside to generate heat, the heat is transferred to the zirconia-based signal layer 10, so that the zirconia-based signal layer 10 reaches the normal working temperature, the zirconia-based signal layer 10 contacts the external oxygen, the oxygen obtains electrons on the outer signal electrode 11 to be ionized, the electrons penetrate into the solid electrolyte in the form of oxygen ions and migrate from the inner signal electrode 12 to the outer signal electrode 11, and then the electrons are given out on the outer signal electrode 11 to generate the oxygen. This process rapidly reaches electrochemical equilibrium, generating an electromotive force E between the inner and outer electrodes, the output potential E of which is determined by the Nernst equation:
E＝(RT/4F)Ln(Pair/Pexh) Wherein T is absolute temperature (K), R is a universal gas constant, and R is 8.314J/mol · K; f is Faraday constant, F is 96500C mol, PairIs the partial pressure of oxygen in the atmosphere, PexhIs the partial pressure of oxygen in the exhaust.
The following describes the process for producing the oxygen sensor of the present application:
the oxygen sensor adopts the processes of tape casting, screen printing, high-temperature sintering and the like, and adopts the multilayer ceramic high-temperature co-firing (HTCC) technology to co-fire zirconia, an outer signal electrode 11, an inner signal electrode 12, alumina and a heating electrode into an oxygen sensor signal layer and a heating layer respectively through high temperature.
The bonding glass glaze 6 is coated between the zirconia-based signal layer 10 and the alumina-based heating layer 20, the materials are sintered and combined into a whole under the condition of high temperature and aerobic atmosphere at 1300 ℃, and the alumina-based heating layer 20, the zirconia-based signal layer 10 and the fixing ring 7 of the oxygen sensor are bonded into a finished oxygen sensor through the bonding glass glaze 6.
By controlling the thickness of the bonding glass glaze 6, under the precondition of ensuring the bonding force, the distance between the zirconia-based signal layer 10 and the alumina-based heating layer 20 is controlled between 1 um and 100um, so that the heat generated after the alumina-based heating layer 20 is electrified and heated can be more efficiently transferred to the zirconia-based signal layer 10. That is, the thickness of the bonding glass glaze 6 between the inner side surface of the zirconia base 2 and the inner side surface of the alumina base 9 in this application is controlled to be 1 to 100 um.
The thickness of the zirconia-based signal layer 10 and the thickness of the alumina-based heating layer 20 are controlled to be between 0.5 and 1.0mm by controlling the thickness and the number of the casting films, so that the oxygen sensor can realize sufficient mechanical strength, and meanwhile, the heating power of the sensor can be ensured to be between 5 and 12W.
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 (6)
1. A split-structure oxygen sensor, comprising: the device comprises a zirconia-based signal layer, an alumina-based heating layer, a fixing ring and a bonding glass glaze, wherein the alumina-based heating layer comprises an alumina matrix, a heating electrode arranged in the alumina matrix, and a first contact electrode arranged on the outer side surface of the alumina matrix and electrically connected with the heating electrode; the zirconia-based signal layer comprises a zirconia matrix, an outer signal electrode, an inner signal electrode and a second contact electrode, wherein an air cavity channel communicated with the outside is formed in the zirconia matrix along the length direction of the zirconia matrix, the outer signal electrode is arranged on the outer side surface of the zirconia matrix, the inner signal electrode is arranged on the inner wall, close to the outer signal electrode, of the air cavity channel, and the outer signal electrode and the inner signal electrode are both electrically connected with the second contact electrode arranged on the outer side surface of the zirconia matrix; the inner side surface of the zirconia matrix is connected with the inner side surface of the alumina matrix through bonding glass glaze, the fixing ring is sleeved on the outer side surfaces of the zirconia matrix and the alumina matrix, and the bonding glass glaze is arranged at the joint of the fixing ring and the zirconia matrix and the joint of the fixing ring and the alumina matrix.
2. The split-structure oxygen sensor according to claim 1, wherein: the heating electrode is embedded in the alumina matrix and extends along the length direction of the alumina matrix.
3. The split-structure oxygen sensor according to claim 1, wherein: the zirconia-based signal layer further comprises a first connecting pole piece arranged on the outer side surface of the zirconia-based body and a second connecting pole piece arranged on the inner wall of the air cavity close to the outer signal electrode, wherein the zirconia-based body is provided with a first through hole for communicating the outer side surface of the zirconia-based body with the air cavity, and the inner wall of the first through hole is coated with first conductive platinum slurry; one end of the second connection pole piece is electrically connected with the inner signal pole piece, the other end of the second connection pole piece is electrically connected with the first conductive platinum paste in the first through hole, the outer signal pole piece is electrically connected with one end of the second contact electrode through the first connection pole piece, and the other end of the second contact electrode is electrically connected with the first conductive platinum paste in the first through hole.
4. The split-structure oxygen sensor according to claim 1, wherein: the alumina base body is provided with a second through hole, and the inner wall of the alumina base body is coated with second conductive platinum slurry; wherein the heating pole piece is electrically connected with the first contact electrode through the second conductive platinum paste.
5. The split-structure oxygen sensor according to claim 4, wherein: the diameter of the second via hole is 0.1 to 1.0 mm.
6. The split-structure oxygen sensor according to claim 1, wherein: the thickness of the bonding glass glaze between the inner side surface of the zirconia matrix and the inner side surface of the alumina matrix is 1-100 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020184323.1U CN211697633U (en) | 2020-02-19 | 2020-02-19 | Split structural type oxygen sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020184323.1U CN211697633U (en) | 2020-02-19 | 2020-02-19 | Split structural type oxygen sensor |
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| CN211697633U true CN211697633U (en) | 2020-10-16 |
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