CN215493306U - Nitrogen-oxygen sensor chip with protective cap coating - Google Patents
Nitrogen-oxygen sensor chip with protective cap coating Download PDFInfo
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- CN215493306U CN215493306U CN202122090166.5U CN202122090166U CN215493306U CN 215493306 U CN215493306 U CN 215493306U CN 202122090166 U CN202122090166 U CN 202122090166U CN 215493306 U CN215493306 U CN 215493306U
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Abstract
The utility model discloses a nitrogen-oxygen sensor chip with a protective cap coating, which comprises a zirconium oxide chip, wherein a first inner electrode, a second inner electrode, a third inner electrode, a fourth inner electrode and a heating electrode are arranged in the zirconium oxide chip, a storage groove is arranged at the local position of the outer surface of the zirconium oxide chip, an outer electrode is arranged in the storage groove, a heating area of the zirconium oxide chip is coated with a protective cap, the protective cap comprises a first protective coating and a second protective coating, the first protective coating coats the second protective coating, and the first protective coating and the second protective coating are both of porous structures. Above-mentioned technical scheme, structural design is reasonable, vapor volatilizees effectually, reliable operation, long service life and practicality are good.
Description
Technical Field
The utility model relates to the technical field of nitrogen-oxygen sensors, in particular to a nitrogen-oxygen sensor chip with a protective cap coating.
Background
In order to obtain high measurement accuracy, the nitrogen-oxygen sensor needs to maintain the temperature of a sensing part and a measuring part at about 850 ℃ all the time during operation, but the structure of the existing nitrogen-oxygen sensor has the following defects: the cracking condition of a zirconia chip is easy to occur in a part of products in the working process, firstly, the cracking of the chip can occur in a certain proportion in the quick starting process, so that the products are failed, and the problem is also common to all large nitrogen-oxygen sensor manufacturers; the second is under the big condition of humidity, and the chip that appears easily receives the influence of moisture even drop of water, and fracture in the twinkling of an eye during the heating can greatly reduced in coastal area nitrogen oxygen sensor's life-span, and life is short, and the practicality is poor.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide the nitrogen-oxygen sensor chip with the protective cap coating, which has the advantages of reasonable structural design, good water vapor volatilization effect, reliable work, long service life and good practicability.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a take nitrogen oxygen sensor chip of protective cap coating, includes the zirconia chip, be provided with first inner electrode, second inner electrode, third inner electrode, fourth inner electrode and heating electrode in the zirconia chip, zirconia chip surface local position is provided with puts the thing recess, it is provided with the outer electrode in the recess to put the thing, the zone of heating cladding of zirconia chip has the protective cap, the protective cap includes first protective coating and second protective coating, first protective coating cladding second protective coating, first protective coating and second protective coating are porous structure.
The utility model is further configured to: the porosity of the second protective coating is greater than the porosity of the first protective coating.
The utility model is further configured to: the thickness of the second protective coating is 180-200 microns, and the porosity is 30% -45%.
The utility model is further configured to: the thickness of the first protective coating is 180-200 microns, and the porosity is 20-30%.
The utility model is further configured to: the first protective coating and the second protective coating are both porous alumina coatings.
The utility model is further configured to: the zirconia chip comprises a substrate, wherein an opening, a first cavity and a second cavity are sequentially arranged on one side of the substrate from outside to inside, a first internal electrode is arranged in the first cavity, and a second internal electrode is arranged in the second cavity.
The utility model is further configured to: the first inner electrode and the outer electrode are used for adjusting the oxygen concentration in the first chamber; the second inner electrode and the outer electrode are used for adjusting the oxygen concentration in the second chamber; the third inner electrode and the outer electrode are used for adjusting the oxygen concentration on the surface of the third inner electrode.
The utility model is further configured to: the fourth internal electrode is a reference electrode, the first internal electrode and the fourth internal electrode are used for measuring the oxygen concentration in the first chamber, and the second internal electrode and the fourth internal electrode are used for measuring the oxygen concentration in the second chamber.
The utility model has the advantages that: compared with the prior art, the structure of the utility model is more reasonable, and the protective cap can greatly reduce the thermal stress brought by the zirconia chip in the rapid heating process; in the normal working process, the surface temperature of the protective cap is 500 ℃ lower than the surface temperature of the original chip by 200 ℃ and 300 ℃, so that the temperature difference impact of the tail gas on the chip can be reduced; especially when the nitrogen oxygen sensor is in an environment with high humidity, water drops can be formed on the surface of the zirconia chip, at the moment, if the chip is rapidly heated, the chip can be possibly quenched and cracked, the mode is also a main mode that the nitrogen oxygen sensor fails for many years, after the protective cap is added, the porous protective layer can absorb certain water vapor, and in the heating process, the porous structure of the protective cap is favorable for volatilization of the water vapor, so that the damage to the zirconia chip can be prevented, and the whole service life of the nitrogen oxygen sensor is prolonged. The structure design is reasonable, the vapor volatilization effect is good, the work is reliable, the service life is long, and the practicability is good.
The utility model is further described with reference to the drawings and the specific embodiments in the following description.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
Detailed Description
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, the utility model discloses a nitrogen-oxygen sensor chip with a protective cap coating, which comprises a zirconia chip 1, wherein a first inner electrode 2, a second inner electrode 3, a third inner electrode 4, a fourth inner electrode 5 and a heating electrode 6 are arranged in the zirconia chip 1, an article placing groove is arranged at a local position on the outer surface of the zirconia chip 1, an outer electrode 7 is arranged in the article placing groove, a heating area of the zirconia chip 1 is coated with a protective cap 8, the protective cap 8 comprises a first protective coating 81 and a second protective coating 82, the first protective coating 81 coats the second protective coating 82, and the first protective coating 81 and the second protective coating 82 are both in a porous structure.
Preferably, the protective cap 8 covers the heating area of the zirconia chip 1 and wraps five electrodes of the outer electrode 7, the first inner electrode 2, the second inner electrode 3, the third inner electrode 4 and the fourth inner electrode 5.
In order to make the structure of the present invention more reasonable, preferably, the porosity of the second protective coating 82 is greater than the porosity of the first protective coating 81, so that the second protective coating 82 has a certain gas storage capacity, and the gas reaction in the chip is ensured.
The thickness of the second protective coating 82 is 180-200 microns, and the porosity is 30% -45%.
The thickness of the first protective coating 81 is 180-200 microns, and the porosity is 20-30%.
The first protective coating 81 and the second protective coating 82 are both porous alumina coatings.
The zirconia chip 1 comprises a substrate 11, wherein an opening 12, a first chamber 13 and a second chamber 14 are sequentially arranged on one side of the substrate 11 from outside to inside, the first inner electrode 2 is arranged in the first chamber 13, and the second inner electrode 3 is arranged in the second chamber 14.
The first inner electrode 2 and the outer electrode 7 are used for adjusting the oxygen concentration in the first chamber 13; the second inner electrode 3 and the outer electrode 7 are used for adjusting the oxygen concentration in the second chamber 14; the third inner electrode 4 and the outer electrode 7 are used for adjusting the oxygen concentration on the surface of the third inner electrode 4.
The fourth internal electrode 5 is a reference electrode, the first internal electrode 2 and the fourth internal electrode 5 are used for measuring the oxygen concentration in the first chamber 13, and the second internal electrode 3 and the fourth internal electrode 5 are used for measuring the oxygen concentration in the second chamber 14.
Preferably, the present embodiment may employ a sensor ceramic chip of a nitrogen oxygen sensor, and the adjustment and measurement of the oxygen concentration in each chamber are performed simultaneously.
The manufacturing method of the protective cap 8 comprises the following steps:
firstly, preparing a second protective coating 82 in a heating area of a sintered zirconia chip, wherein a mold or an intrusion coating method can be adopted, the thickness of the second protective coating 82 is between 180 and 200 microns, and the porosity is between 30 and 45 percent;
then, after drying the second protective coating 82 by using a drying device, continuously preparing a first protective coating 81 on the second protective coating 82 by using a mold or an immersion coating method, wherein the thickness of the first protective coating 81 is between 180 and 200 microns, and the porosity is between 20 and 30 percent;
and drying the first protective coating 81 by adopting drying equipment, and sintering at 1300 ℃ for 1 hour to obtain the porous protective coating cap.
In practical application, the protective cap can greatly reduce the thermal stress brought by the zirconia chip in the rapid heating process; in the normal working process, the surface temperature of the protective cap is 500 ℃ lower than the surface temperature of the original chip by 200 ℃ and 300 ℃, so that the temperature difference impact of the tail gas on the chip can be reduced; especially when the nitrogen oxygen sensor is in an environment with high humidity, water drops can be formed on the surface of the zirconia chip, at the moment, if the chip is rapidly heated, the chip can be possibly quenched and cracked, the mode is also a main mode that the nitrogen oxygen sensor fails for many years, after the protective cap is added, the porous protective layer can absorb certain water vapor, and in the heating process, the porous structure of the protective cap is favorable for volatilization of the water vapor, so that the damage to the zirconia chip can be prevented, and the whole service life of the nitrogen oxygen sensor is prolonged. The structure design is reasonable, the vapor volatilization effect is good, the work is reliable, the service life is long, and the practicability is good.
The above embodiments are only for further illustration of the present invention, and should not be construed as limiting the scope of the present invention, and the technical engineers in the art can make insubstantial modifications and adaptations of the present invention based on the above disclosure and disclosure of the utility model.
Claims (8)
1. The utility model provides a take nitrogen oxygen sensor chip of protective cap coating, includes zirconia chip (1), its characterized in that: the novel zirconia ceramic package structure is characterized in that a first inner electrode (2), a second inner electrode (3), a third inner electrode (4), a fourth inner electrode (5) and a heating electrode (6) are arranged in the zirconia chip (1), an article placing groove is formed in the local position of the outer surface of the zirconia chip (1), an outer electrode (7) is arranged in the article placing groove, a heating area is coated with a protective cap (8) of the zirconia chip (1), the protective cap (8) comprises a first protective coating (81) and a second protective coating (82), the second protective coating (82) is coated with the first protective coating (81), and the first protective coating (81) and the second protective coating (82) are both of a porous structure.
2. The oxynitride sensor chip with a protective cap coating of claim 1, wherein: the porosity of the second protective coating (82) is greater than the porosity of the first protective coating (81).
3. The oxynitride sensor chip with a protective cap coating of claim 2, wherein: the thickness of the second protective coating (82) is 180-200 microns, and the porosity is 30% -45%.
4. The oxynitride sensor chip with a protective cap coating of claim 3, wherein: the thickness of the first protective coating (81) is 180-200 microns, and the porosity is 20-30%.
5. The oxynitride sensor chip with a protective cap coating of claim 4, wherein: the first protective coating (81) and the second protective coating (82) are both porous alumina coatings.
6. The oxynitride sensor chip with a protective cap coating according to claim 1 or 4, wherein: the zirconia chip (1) comprises a substrate (11), wherein an opening (12), a first chamber (13) and a second chamber (14) are sequentially arranged on one side of the substrate (11) from outside to inside, the first inner electrode (2) is arranged in the first chamber (13), and the second inner electrode (3) is arranged in the second chamber (14).
7. The oxynitride sensor chip with a protective cap coating of claim 1, wherein: the first inner electrode (2) and the outer electrode (7) are used for adjusting the oxygen concentration in the first chamber (13); the second inner electrode (3) and the outer electrode (7) are used for adjusting the oxygen concentration in the second chamber (14); the third inner electrode (4) and the outer electrode (7) are used for adjusting the oxygen concentration on the surface of the third inner electrode (4).
8. The oxynitride sensor chip with a protective cap coating of claim 1, wherein: the fourth internal electrode (5) is a reference electrode, the first internal electrode (2) and the fourth internal electrode (5) are used for measuring the oxygen concentration in the first chamber (13), and the second internal electrode (3) and the fourth internal electrode (5) are used for measuring the oxygen concentration in the second chamber (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122090166.5U CN215493306U (en) | 2021-09-01 | 2021-09-01 | Nitrogen-oxygen sensor chip with protective cap coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122090166.5U CN215493306U (en) | 2021-09-01 | 2021-09-01 | Nitrogen-oxygen sensor chip with protective cap coating |
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| CN215493306U true CN215493306U (en) | 2022-01-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552201A (en) * | 2021-09-01 | 2021-10-26 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with protective cap coating |
| CN115598189A (en) * | 2022-10-08 | 2023-01-13 | 浙江百岸科技有限公司（Cn） | Nitrogen-oxygen sensor chip with hidden circuit |
-
2021
- 2021-09-01 CN CN202122090166.5U patent/CN215493306U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552201A (en) * | 2021-09-01 | 2021-10-26 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with protective cap coating |
| CN115598189A (en) * | 2022-10-08 | 2023-01-13 | 浙江百岸科技有限公司（Cn） | Nitrogen-oxygen sensor chip with hidden circuit |
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