WO2007004500A1 - ガスセンサ素子及びその製造方法 - Google Patents
ガスセンサ素子及びその製造方法 Download PDFInfo
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- WO2007004500A1 WO2007004500A1 PCT/JP2006/312968 JP2006312968W WO2007004500A1 WO 2007004500 A1 WO2007004500 A1 WO 2007004500A1 JP 2006312968 W JP2006312968 W JP 2006312968W WO 2007004500 A1 WO2007004500 A1 WO 2007004500A1
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Definitions
- the present invention relates to a gas sensor element that can be used for combustion control of an internal combustion engine such as a vehicle engine and a method for manufacturing the same.
- 02 sensor element In order to detect 02 concentration, NOx concentration, air-fuel ratio, etc. contained in exhaust gas, etc. in the exhaust system of a vehicle internal combustion engine, 02 sensor element, NOx sensor element, AZF sensor element, etc.
- the gas sensor element is used.
- a cup-type or stacked-type element including a solid electrolyte having ion conductivity, an insulator having electrical insulation, and an electrode is used.
- various stresses are applied to the gas sensor element installed in the exhaust gas. For example, when the gas sensor element is activated rapidly, the temperature of the gas sensor element rises rapidly and stress is generated in the gas sensor element. Also, stress is generated in the gas sensor element when the gas sensor element is exposed to water vapor or the like contained in the exhaust gas or the atmosphere. Furthermore, stress is generated in the gas sensor element even when the temperature or flow velocity of the exhaust gas changes abruptly.
- the gas sensor element has been covered with a protective cover.
- a protective cover it has been difficult to sufficiently reduce the stress applied to the gas sensor element.
- the stress caused by the water is caused by moisture contained in the gas, such as exhaust gas, reference gas, air, etc., which is difficult to avoid direct contact with the gas sensor element. For this reason, it was difficult to reduce the stress even with a protective cover.
- a zirconium-based composite ceramic sintered body in which A1203 particles having an average particle size of 2 ⁇ m or less are dispersed in partially stabilized zirconium oxide having an average particle size of 5 ⁇ m or less has been developed (Patent Document 1). reference).
- a powerful zircoure-based composite ceramic can exhibit high strength. If such a zircoyu composite ceramic sintered body is applied to a gas sensor element, it is considered that a gas sensor element that can exhibit excellent resistance to stress such as stress can be obtained.
- Patent Document 1 Japanese Patent No. 2703207
- a solid electrolyte body that requires only strength is required to have ionic conductivity, and an insulator that requires electrical insulation. If these characteristics are not satisfied, the gas sensor element may not function even if the strength is high.
- the present invention has been made in view of the conventional problems that are intensive, and can exhibit excellent resistance to a large stress such as a stress generated during water exposure, for example. It is an object of the present invention to provide an excellent gas sensor element and a manufacturing method thereof.
- the first invention is formed so as to sandwich a solid electrolyte body mainly composed of ion conductive ceramics, an insulator mainly composed of an insulating ceramic, and at least a part of the solid electrolyte body.
- a gas sensor element comprising a pair of electrodes,
- the gas sensor element satisfies at least one of the following requirements (a) and (b) (Claim 1).
- At least a part of the solid electrolyte body is also an ion-conductive composite material in which 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less are dispersed in the main component also having the ion-conductive ceramic force. Consists of.
- At least a part of the insulator is made of an insulating composite material in which 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less is dispersed in the main component also having the insulating ceramic power.
- the gas sensor element satisfies the requirement (a) and Z or the requirement (b).
- the solid electrolyte body can withstand a large stress exceeding 350 MPa, for example, and can exhibit excellent strength. Further, in the ion conductive composite material, a specific amount of the nanoparticles of 0.1 to 20 wt% is dispersed in the main component such as the ion conductive ceramics. Therefore, for example, even when the nanoparticles are made of an insulating material, the solid electrolyte body can sufficiently ensure conductivity.
- the insulator can withstand a large stress exceeding 350 MPa, for example. Can exhibit excellent strength.
- the insulating composite material a specific amount of the nanoparticles of 0.1 to 20 wt% is dispersed in the main component such as the insulating ceramic cage. Therefore, for example, even if the nanoparticles are a conductive material, the insulator can sufficiently ensure insulation.
- the solid electrolyte body made of the ion conductive composite material and the insulating composite material also have the above-mentioned power.
- the insulator can exhibit excellent strength as described above, and can sufficiently ensure the conductivity of the solid electrolyte body and the insulation of the insulator.
- the gas sensor element can exhibit excellent strength while sufficiently ensuring the function as the gas sensor element. Therefore, even if a large stress is applied to the gas sensor element, it is possible to prevent the gas sensor element from being damaged, such as a crack, and to perform accurate detection.
- stress applied to the gas sensor element includes stress generated by a rapid element temperature rise during early activation, exhaust gas temperature 'stress generated when the flow velocity changes suddenly, The generated stress is considered.
- the stress generated during flooding is the largest under on-vehicle conditions.
- the stress generated by water exposure increases according to the amount of water covered, and reaches a maximum value (maximum generated stress) when the generated water is saturated to a certain level or more (see Fig. 11). . Accordingly, by using a solid electrolyte body and z or an insulator having a strength exceeding the maximum generated stress, cracking of the solid electrolyte body and Z or an insulator can be prevented.
- the solid electrolyte body that satisfies the above (a) and Z or the above insulator that satisfies the above (b) requirements are used. Therefore, the solid electrolyte body and Z or the insulator can exhibit strength exceeding a large stress at the time of flooding, and can prevent the occurrence of cracks and the like.
- a second invention is a solid electrolyte body comprising an ion conductive composite material in which 0.1 to 20 wt% of nano particles having a particle size of lOOnm or less are dispersed in a main component such as an ion conductive ceramic carrier.
- a gas sensor element manufacturing method comprising: an insulator mainly composed of insulating ceramics; and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body, wherein nanoparticles having a particle size of lOOnm or less are used as a solvent.
- the nanoparticle slurry and the ion conductive ceramic slurry are mixed at a mixing ratio of 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the nanoparticles and the ion conductive ceramic.
- An ion conductive composite material molding step for producing an ion conductive composite material molded body by molding the ion conductive composite material slurry
- the present invention provides a method for producing a gas sensor element, comprising: a firing step for producing the gas sensor element (claim 6).
- a third invention relates to a solid electrolyte body made of an ion conductive composite material in which 0.1 to 20 wt% of nano particles having a particle size of lOOnm or less are dispersed in a main component such as an ion conductive ceramic carrier.
- a gas sensor element manufacturing method comprising: an insulator mainly composed of insulating ceramics; and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body, wherein nanoparticles having a particle size of lOOnm or less are used as a solvent.
- a nano-slurry preparation step for preparing a nano-particle slurry by dispersing in
- the nanoparticle slurry and the ion conductive ceramic slurry are mixed at a mixing ratio of 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the nanoparticles and the ion conductive ceramic.
- An ion conductive composite material molding step for producing an ion conductive composite material molded body by molding the ion conductive composite material slurry
- nanoparticles having a particle size of lOOnm or less are dispersed in an amount of 0.1 to 20 wt% in a solid electrolyte body mainly composed of ion-conducting ceramics and a main component also having an insulating ceramic force.
- a gas sensor element manufacturing method comprising: an insulator made of an insulating composite material; and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body,
- An ion conductive ceramic molding step for producing an ion conductive ceramic molded body by molding the ion conductive ceramic slurry
- the nanoparticle slurry and the insulating ceramic slurry are mixed at a mixing ratio such that the nanoparticle is 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the nanoparticles and the insulating ceramic.
- An insulating composite material molding step for producing an insulating composite material molded body by molding the insulating composite material slurry
- a method for producing a gas sensor element comprising: a firing step of producing the gas sensor element by integrally firing the ion conductive ceramic molded body and the insulating composite material molded body. (Claim 13).
- a solid electrolyte body mainly composed of ion-conducting ceramics and an insulating composite material in which 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less are dispersed in a main component also having an insulating ceramic power. And a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body,
- the nanoparticle slurry and the insulating ceramic slurry are mixed at a mixing ratio such that the nanoparticle is 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the nanoparticles and the insulating ceramic.
- a method for producing a gas sensor element comprising: a ceramic body forming step (claim 14).
- a solid electrolyte body comprising an ion-conductive composite material in which 0.1 to 20 wt% of first nanoparticles having a particle size of lOOnm or less are dispersed in a main component such as an ion-conductive ceramic cartridge, and an insulating material. Formed so as to sandwich at least part of the solid electrolyte body and an insulator made of an insulating composite material in which second nanoparticles with a particle size of lOOnm or less are dispersed in an amount of 0.1 to 20 wt% in the main component such as ceramics
- a method of manufacturing a gas sensor element comprising a pair of formed electrodes
- the first nanoparticle slurry and the ion conductive ceramic slurry are combined with the first nanoparticle slurry.
- the ion conductive composite material slurry An ion conductive composite preparation process for preparing
- An ion conductive composite material molding step for producing an ion conductive composite material molded body by molding the ion conductive composite material slurry
- the second nanoparticle slurry and the insulating ceramic slurry are 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the second nanoparticles and the insulating ceramics.
- Insulating composite material preparation step for preparing an insulating composite material slurry by mixing at such a mixing ratio;
- An insulating composite material molding step for producing an insulating composite material molded body by molding the insulating composite material slurry
- a gas sensor element manufacturing method comprising: a firing step of fabricating the gas sensor element by integrally firing the ion conductive composite material molded body and the insulating composite material molded body. (Claim 20).
- a solid electrolyte body comprising an ion conductive composite material in which 0.1 to 20 wt% of first nanoparticles having a particle size of lOOnm or less are dispersed in a main component such as an ion conductive ceramic capacitor, and an insulating material.
- the insulator composed of an insulating composite material in which 0.1 to 20 wt% of second nanoparticles with a particle size of lOOnm or less is dispersed in the main component such as a ceramics and at least a part of the solid electrolyte body is sandwiched
- a gas sensor element manufacturing method comprising a pair of electrodes formed on
- a first nanoslurry preparation step for preparing and producing a first nanoparticle slurry by dispersing first nanoparticles having a particle size of lOOnm or less in a solvent An ion conductive slurry preparation step of preparing an ion conductive ceramics slurry by dispersing ion conductive ceramics in a solvent;
- the first nanoparticle slurry and the ion conductive ceramic slurry are 0.1 to 20 weights of the first nanoparticle with respect to 100 parts by weight of the total amount of the first nanoparticles and the ion conductive ceramic.
- An ion conductive composite material molding step for producing an ion conductive composite material molded body by molding the ion conductive composite material slurry
- the second nanoparticle slurry and the insulating ceramic slurry are 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the second nanoparticles and the insulating ceramics.
- Insulating composite material preparation step for preparing an insulating composite material slurry by mixing at such a mixing ratio;
- a method of manufacturing a gas sensor element comprising: a ceramic body forming step (claim 21).
- nanoparticles having a specific particle size and ion conductive ceramics and / or insulating ceramics are mixed at a specific ratio. It is in being.
- nanoparticles having a particle size of lOOnm or less are contained.
- the nanoparticle slurry and the ion conductive ceramic slurry are mixed so that the nanoparticle is 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the nanoparticles and the ion conductive ceramic.
- Mixing at a ratio (the above ion conductive composite material preparation process)
- the nanoparticle slurry containing nanoparticles having a particle size of lOOnm or less and the insulating ceramic slurry are combined with the nanoparticles and the insulating ceramic.
- the nanoparticles are mixed at a mixing ratio of 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount (the insulating composite material preparation step).
- the ion conductive composite material preparation step and the insulating composite material preparation step are performed.
- the gas sensor element of the first invention can be manufactured.
- the gas sensor element that satisfies the requirement (a) of the first invention can be manufactured.
- the gas sensor element that satisfies the requirements (a) and (b) of the first invention can be manufactured.
- FIG. 1 is a perspective development view of a gas sensor element according to a first embodiment.
- FIG. 2 is a perspective view of a gas sensor element according to Example 1.
- FIG. 3 is a cross-sectional view of main parts of a gas sensor element according to Example 1.
- FIG. 4 is an explanatory diagram showing the overall configuration of the high-pressure dispersion device according to the first embodiment.
- FIG. 5 is an explanatory diagram showing the configuration of the mixing and dispersing unit of the high-pressure dispersing apparatus according to the first embodiment.
- FIG. 6 is an explanatory view showing a cross section of a gas sensor element according to Example 2.
- FIG. 7 is an explanatory diagram of a gas sensor including a gas sensor element according to a second embodiment.
- FIG. 8 is an explanatory diagram showing the overall configuration of the high-speed shear mixer according to the second embodiment.
- FIG. 9 is an explanatory view showing a configuration of a sealed pressure vessel of a high-speed shear mixer according to Example 2.
- FIG. 10 is an explanatory diagram showing a bending strength test method according to an experimental example.
- FIG. 11 is a diagram showing the relationship between the moisture content of the gas sensor element and the generated stress under on-vehicle conditions.
- FIG. 12 is a perspective development view of the gas sensor element according to Example 3.
- Insulator reference gas chamber forming plate
- the gas sensor element satisfies the requirements (a) and Z or (b).
- the requirement (a) is that at least a part of the solid electrolyte body is obtained by dispersing 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less in a main component that also has an ion conductive ceramic force.
- the power of conductive composite materials is that at least a part of the solid electrolyte body is obtained by dispersing 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less in a main component that also has an ion conductive ceramic force.
- the above (b) requirement is that at least a part of the insulator is an insulating composite material in which nanoparticles having a particle size of lOOnm or less are dispersed in an amount of 0.1 to 20 wt% in a main component having insulating ceramic strength. There is something to be done.
- the strength of the solid electrolyte body and the insulating body may be reduced. Therefore, in this case, if a stress exceeding an allowable value is applied to the gas sensor element due to moisture or the like, the gas sensor element may be cracked and the gas sensor element may not be able to perform accurate measurement. .
- the dispersion amount of the nanoparticles is less than 0.1 wt%, The effect of improving the degree cannot be sufficiently obtained, and there is a possibility that cracking or the like may occur due to moisture.
- the dispersion amount of the nanoparticles exceeds 20 wt% and the nanoparticles are made of an insulating material, the ionic conductivity of the solid electrolyte body is lowered, and the gas sensor element functions. There is a risk of disappearing.
- the dispersion amount of the nanoparticles exceeds 20 wt%, and the nanoparticles become a conductive material, the insulating property of the insulator is lowered and the gas sensor element does not function. There is a fear.
- the gas sensor element preferably satisfies both the above requirements (a) and (b).
- the gas sensor element may have one or a plurality of the solid electrolyte bodies.
- the solid electrolyte bodies When a plurality of the solid electrolyte bodies are included, at least one of them can be formed of the ion conductive composite material.
- the gas sensor element may include one or more of the insulators.
- the insulators In the case where a plurality of the insulators are provided, at least one of the insulators can be formed using the insulating composite material.
- the solid electrolyte body is mainly composed of an ion conductive ceramic.
- Examples of the ion-conducting ceramics include zirconia and partially stable zirconia.
- Stabilized zirconia ceria, gadolinium, strontium ceria, strontium zirconate, barium ceria, and barium zirconate.
- the insulator includes an insulating ceramic as a main component.
- Examples of the insulating ceramic include alumina, silica, aluminum nitride, and nitride nitride.
- the ion conductive ceramic is a partially stable zirconia powder in which a stabilizer is added to a main component that also has a zirconia force, and the insulating ceramic is preferably an alumina force. 2).
- the ion conductive ceramic and the insulating ceramic form a chemically stable combination, and are stable even when used in an environment that can be an acid atmosphere and a reducing atmosphere such as exhaust gas. The characteristic can be exhibited.
- zirconium oxide Generally, several mol% of stabilizers such as magnesia (magnesium oxide), calcium oxide, yttria (yttrium oxide), cerium oxide, titanium oxide, and rare earth oxides are added to zircoure (zirconium oxide).
- the added material has a cubic fluorite structure and no phase transition occurs. This is stable Zircoyu.
- the partially stabilized zirconium oxide is a zirconium oxide in which a part of the composition is stabilized.
- nanoparticles for example, those having the same material strength as the ion conductive ceramics or the insulating ceramics can be used.
- the nanoparticles may have one or more forces selected from alumina, zircoure, partially stable zircoure, and the stabilizer (claim 3).
- the constituent material is chemically stable, the dispersion state in the grain and the grain boundary is not limited, and the ion-conductive composite material and the insulating composite material are formed into the gas sensor element. Since it can be formed with the same component as the element, it is possible to prevent deterioration over time due to reaction between different elements.
- the solid electrolyte body is made of the ion conductive composite material in which the nano particles made of alumina or the like are dispersed in the ion conductive ceramic made of partially stable zirconia.
- the insulator may be the insulating composite material in which the nanoparticles having at least one kind of force selected from zirconia, partially stable zircoure, and a stabilizer are dispersed in the insulating ceramic also having alumina force. preferable.
- the gas sensor element having a laminated structure is configured by laminating the solid electrolyte body and the insulator.
- the bonding state between the solid electrolyte body and the insulator can be improved.
- the gas introduced into the gas sensor element or the solid electrolyte body arranged at a position in contact with the atmosphere is preferably the ion conductive composite material. ⁇ (Claim 4).
- the gas sensor element it is possible to improve the strength of the solid electrolyte body disposed in a portion that is susceptible to water. That is, a solid electrolyte body that comes into contact with a gas such as an exhaust gas, a reference gas, or the atmosphere is likely to be wetted by moisture contained in the gas.
- a gas such as an exhaust gas, a reference gas, or the atmosphere
- At least the gas introduced into the gas sensor element or the insulator disposed at a position in contact with the atmosphere is made of the insulating composite material. (Claim 5).
- the gas sensor element it is possible to improve the strength of the insulator disposed in a portion that is susceptible to water exposure. That is, an insulator that comes into contact with a gas such as exhaust gas, reference gas, or the atmosphere is likely to be wetted by moisture contained in the gas. By forming the insulator that is easily wetted with the insulating composite material, it is possible to more reliably prevent the insulating body from being damaged by the flooded water.
- the gas sensor element is, for example, 02 sensor element, NOx sensor element, HC sensor element
- CO sensor elements can be applied to CO sensor elements, AZF sensor elements, and composite gas sensor elements that can detect multiple types of gas concentrations.
- the gas sensor element is applied to a laminated element formed by laminating a plate-shaped solid electrolyte body and an insulator, or a cup-type element having a bottomed cylindrical solid electrolyte body. be able to.
- the nano-slurry preparation step, the ion-conductive slurry preparation step, the ion-conductive composite material preparation step, the ion-conductive composite material molding step, and the electrode printing portion formation The process, the rally preparation process, the insulating ceramic forming process, and the firing process are performed.
- a nano-particle slurry is prepared by dispersing nanoparticles having a particle size of lOOnm or less in a solvent.
- the particle size of the nanoparticles exceeds lOOnm, the strength of the solid electrolyte body of the gas sensor element finally obtained may be reduced.
- the nanoparticles for example, those having the same material force as the ion-conducting ceramics or the insulating ceramics can be used as in the first invention.
- the nanoparticles may have at least one force selected from alumina, zircoure, partially stabilized zircoure, and the stabilizing agent.
- the ion conductive ceramic slurry is prepared by dispersing the ion conductive ceramic in a solvent.
- Examples of the ion conductive ceramics include, as in the first invention, for example, zirconium, partially stabilized zirconium, stabilized zirconium, ceria, gadolinium, strontium ceria, strontium zirconate, and barium ceria. , And barium zirconate can be used.
- the above-mentioned partially stable zirconia is obtained by adding a stabilizer to the main component such as zirconia.
- the insulating ceramic slurry is prepared by dispersing the insulating ceramic in a solvent.
- Examples of the insulating ceramic include alumina, silica, aluminum nitride, and silicon nitride, as in the first invention.
- Alumina is preferable.
- the nanoparticle slurry and the ion conductive ceramic slurry are added to 100 parts by weight of the total amount of the nanoparticles and the ion conductive ceramics.
- the above-mentioned nanoparticles are mixed at a mixing ratio of 0.1 to 20 parts by weight.
- the gas sensor element finally obtained does not have a sufficient effect of improving the strength due to the nanoparticles, and cracks due to moisture etc. May occur. On the other hand, if it exceeds 20 parts by weight, the ionic conductivity of the solid electrolyte body is lowered, and the gas sensor element may not function.
- the ion conductive composite material molded body is manufactured by molding the ion conductive composite material slurry.
- the insulating ceramic formed body is produced by forming the insulating ceramic slurry.
- the molding can be performed by a doctor blade method, extrusion molding, injection molding, cutting molding, press molding, laminating molding, or the like.
- the electrode printing step a pair of electrode printing portions are formed so as to sandwich at least a part of the ion-conductive composite material molded body.
- the electrode printing part can be formed by printing a metal paste obtained by dispersing a conductive metal such as platinum in a solvent.
- the ion-conductive composite molded body and the insulating ceramic molded body are integrally fired.
- firing can be performed by heating at a temperature of 1400 to 1550 ° C, for example.
- the solid electrolyte body mainly composed of ion conductive ceramics, the insulator mainly composed of insulating ceramic, and at least a part of the solid electrolyte body were sandwiched.
- a gas sensor element provided with a pair of electrodes can be obtained.
- at least a part of the solid electrolyte body contains 0.1 ⁇ l of nanoparticles having a particle size of lOOnm or less in the main component of the ion-conductive ceramic cartridge. Consists of ion-conductive composite material dispersed up to 20 wt%.
- the gas sensor element is manufactured by performing a rally preparation process and an insulating ceramic body forming process.
- the nano-slurry preparation step, the ion-conductive slurry preparation step, the ion-conductive composite material preparation step, the ion-conductive composite material molding step, and the absolute rally preparation step are the same steps as the respective steps of the second invention.
- the solid electrolyte body is produced by firing the ion-conductive composite material molded body. Firing of the ion-conductive composite material molded body can be performed, for example, by heating at a temperature of 1400 to 1550 ° C.
- a pair of electrodes is formed so as to sandwich at least a part of the solid electrolyte body.
- an electrode can be formed by attaching a conductive metal to the solid electrolyte body by surface treatment such as plating.
- the insulating ceramic body forming step the insulating ceramic slurry is baked on the solid electrolyte body, or the insulating ceramic slurry is plasma sprayed onto the solid electrolyte body, whereby the solid electrolyte body and An insulating ceramic body is formed integrally.
- nanoparticles having a particle size of lOOnm or less are contained in an amount of 0.1 to 20 wt% in the main component also having ion conductive ceramic power.
- a gas sensor element comprising a solid electrolyte body made of dispersed ion-conductive composite material, an insulator mainly composed of insulating ceramics, and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body Can be obtained.
- an ion conductive slurry preparation step a nano slurry preparation step, a complete slurry preparation step, an insulating composite material preparation step, an ion conductive ceramic forming step, an insulating composite material forming step
- the gas sensor element is manufactured by performing an electrode printing part forming step and a firing step.
- the nano-slurry preparation step, the ion-conductive slurry preparation step, and the insulating slurry preparation step are the same steps as the steps of the second invention. .
- the nanoparticle slurry and the insulating ceramic slurry are added to the nanoparticle with respect to a total amount of 100 parts by weight of the nanoparticle and the insulating ceramic. Mix at a mixing ratio of 1 to 20 parts by weight. As a result, the insulating composite material slurry in which the nanoparticle slurry and the insulating ceramic slurry are dispersed in the solvent can be obtained.
- the above-described gas sensor element finally obtained as described above cannot sufficiently obtain the effect of improving the strength due to the nanoparticles, There is a risk of cracking and the like.
- the amount exceeds 20 parts by weight the insulating property of the insulator is lowered, and the gas sensor element may not function.
- the ion conductive ceramic molding step the ion conductive ceramic molded body is formed by molding the ion conductive ceramic slurry.
- the insulating composite material molding step the insulating composite material molded body is manufactured by molding the insulating composite material slurry.
- These moldings can be performed by the doctor blade method, extrusion molding, injection molding, cutting molding, press molding, laminating molding, and the like, as in the second invention.
- a pair of electrode printing portions are formed so as to sandwich at least a part of the ion-conductive ceramic formed body.
- the electrode printing portion can be formed in the same manner as in the second invention.
- the ion-conductive ceramic molded body and the insulating composite material molded body are integrally fired.
- temperature 1 for example, temperature 1
- Firing can be performed by heating at 400 to 1550 ° C.
- the solid electrolyte body mainly composed of ion conductive ceramics, the insulator mainly composed of insulating ceramic, and at least part of the solid electrolyte body were sandwiched.
- a gas sensor element provided with a pair of electrodes can be obtained.
- at least a part of the insulator includes 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less dispersed in the main component also having the insulating ceramic force.
- the gas sensor element is manufactured by performing a preparation step and an insulating ceramic body formation step.
- the nano-slurry preparation step, the ion conductive slurry preparation step, and the insulating slurry preparation step are the same steps as the respective steps of the second invention.
- the insulating composite material preparation step and the ion conductive ceramic forming step are the same as the steps of the fourth invention.
- the electrode forming step is the same step as the powerful step in the third invention.
- the solid electrolyte body is produced by firing the ion-conductive ceramic formed body at a temperature of 140 ° C to 1550 ° C, for example.
- the insulating ceramic body forming step in the fifth invention the insulating composite material slurry is baked on the solid electrolyte body, or the insulating composite material slurry is baked on the solid electrolyte body.
- the insulating ceramic body is formed integrally with the solid electrolyte body by plasma spraying.
- the solid electrolyte body mainly composed of ion conductive ceramics and the main component composed of insulating ceramics
- An insulating composite material in which 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less are dispersed, and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body A gas sensor element can be obtained.
- the gas sensor element is manufactured by performing a composite material preparing step, an ion conductive composite material forming step, an insulating composite material forming step, an electrode printing portion forming step, and a firing step.
- the first nano-slurry preparation step, the ion conductive slurry preparation step, the insulating slurry preparation step, and the second nano-slurry preparation step are the same as the steps of the second invention.
- the first nano-slurry preparation step and the second nano-slurry preparation step are expressed separately for convenience of explanation, but are substantially the same steps as the nano-slurry preparation step in the second invention, This is a step of dispersing nanoparticles in a solvent.
- the ion conductive composite material preparation step is the same step as the second invention, and the insulating composite material preparation step is the same step as the fourth invention.
- the first nanoparticle slurry in the first nanoslurry preparation step is a nanoparticle slurry for mixing with the ion conductive ceramic slurry.
- the second nano slurry in the second nano slurry preparation step is a nano particle slurry for mixing with the insulating ceramic slurry.
- nanoparticles first nanoparticles and second nanoparticles
- forces selected from alumina, zirconium, partially stable zirconium oxide, and the stabilizer as described above may be used. It is preferable to use one.
- a partially stable zirconium oxide is used as the ion conductive ceramic, and in the first nano slurry preparation step, the first nano particles are used. It is more preferable to use alumina as
- alumina is used as the insulating ceramic
- zirconia, partially stable zirconium oxide, and stable are used as the second nano slurry. It is more preferable to use nanoparticles that have at least one kind of power selected.
- the solid electrolyte body and the insulator contain the same component. Therefore, for example, when the gas sensor element having a laminated structure is configured by laminating the solid electrolyte body and the insulator, the bonding state between the solid electrolyte body and the insulator can be improved.
- the ion conductive composite material molding step as in the second invention, the ion conductive composite material molded body is produced by molding the ion conductive composite material slurry.
- the insulating composite material molded body is produced by molding the insulating composite material slurry, as in the fourth invention.
- a pair of electrode printing portions is formed so as to sandwich at least a part of the ion-conductive composite material molded body, as in the second invention.
- the ion-conductive composite material molded body and the insulating composite material molded body are integrally fired.
- firing can be performed by heating at a temperature of 1400 to 1550 ° C., for example.
- the solid electrolyte body mainly composed of ion conductive ceramics, the insulator mainly composed of insulating ceramic, and at least a part of the solid electrolyte body were sandwiched.
- a gas sensor element provided with a pair of electrodes can be obtained.
- at least a part of the solid electrolyte body contains 0.1 ⁇ l of nanoparticles having a particle size of lOOnm or less in the main component of the ion conductive ceramics.
- At least a part is an insulating composite material in which 0.1 to 20 wt% of nano particles having a particle size of lOOnm or less are dispersed in the main component of the insulating ceramics.
- the first nanoslurry preparation step, the ion conductive slurry single preparation step, the ion conductive composite material preparation step, the ion conductive composite material molding step, the firing step, and the electrode formation The gas sensor element is manufactured by performing a step, a second nano-slurry preparation step, an insulating slurry preparation step, and an insulating ceramic body forming step.
- the first nanoslurry preparation step, the ion conductive slurry preparation step, the insulating slurry preparation step, and the second nanoslurry preparation step are the same as the steps of the second invention.
- the ion conductive composite material preparation step is the same step as the second invention, and the insulating composite material preparation step is the same step as the fourth invention.
- the ion-conductive composite material molded body is produced by molding the ion-conductive composite material slurry as in the second invention.
- the solid electrolyte body is produced by firing the ion-conductive composite material molded body, as in the third invention.
- the electrode forming step a pair of electrodes is formed so as to sandwich at least a part of the solid electrolyte body, as in the third invention.
- the insulating composite material slurry is baked on the solid electrolyte body, or there is! By plasma spraying the solid electrolyte body, an insulating ceramic body is formed integrally with the solid electrolyte body.
- 0.1 to 20 wt% of nanoparticles having a particle size of lOOnm or less are contained in the main component of ion-conductive ceramic force.
- Insulated composite material in which 0.1 to 20 wt% of nanoparticles with a particle size of lOOnm or less are dispersed in the main component consisting of dispersed ion-conducting composite material and insulating ceramics It is possible to obtain a gas sensor element including an insulating body mainly composed of insulating ceramic and a pair of electrodes formed so as to sandwich at least a part of the solid electrolyte body.
- each slurry (nanoparticle slurry, ion conductive ceramic slurry, insulating ceramic slurry, ion conductive composite slurry, insulating composite slurry) is a solid phase in which particles are dispersed. It is a dispersion.
- Examples of the solvent in which the nanoparticles, the particles of the ion conductive ceramics, and the particles of the insulating ceramics are dispersed include, for example, ethanol, alcohols such as 2-butanol, polybutyrate (PVB), and benzyl.
- Various organic solvents such as butyl phthalate (BBP) can be used.
- BBP butyl phthalate
- a mixed solvent in which two or more selected from these alcohols and organic solvents are mixed can also be used.
- a high-pressure dispersion apparatus including a flow path that becomes a passage for each slurry and a collision portion provided in the middle of the flow path is used. It is preferable to perform high-pressure dispersion treatment in which each slurry is pumped into the flow path of the dispersion device and dispersed while causing each slurry to collide with the collision portion under a pressure of 10 to 400 MPa (Claim 8 and Claim 15, Claim 22).
- the nanoparticles, the ion conductive ceramic particles, and the insulating ceramic particles are prevented from aggregating to form secondary particles.
- the particles can be dispersed.
- the particles can be more uniformly dispersed, and the uniform dispersion state can be kept stable for a long period of time.
- the uniformity of the internal composition of the solid electrolyte body and the insulator of the gas sensor element finally obtained can be further improved, and the uniformity of nanoparticle dispersion can be further improved. Therefore, a gas sensor element with excellent strength can be obtained.
- the nanoparticles, the ion conductive ceramic particles, and the insulating ceramic particles can be dispersed efficiently and continuously.
- the high-pressure dispersion apparatus has a mixing / dispersing part provided to move the movable orifice up and down, and uses the tip of the movable orifice exposed inside the mixing / dispersing part as the collision part. It is preferable to carry out the high-pressure dispersion treatment (claim 9, claim 16, Claim 23).
- a pressure change and a shock wave can be formed in the vicinity of the place where the slurry collides with the movable orifice (the tip).
- the slurry is highly refined, dispersed, emulsified and mixed, and the nanoparticles, the ion-conductive ceramic particles, and the insulating ceramic particles are efficiently and reliably applied to the solvent.
- a slurry that can be dispersed uniformly and can be stably dispersed for a long period of time can be prepared.
- the volume of the flow path can be changed by the movable orifice, and the volume of the flow path is controlled according to the particle size and concentration of particles contained in the introduced slurry. can do. As a result, uniform dispersion can be controlled optimally and stably.
- a high-pressure homogenizer can be used as the high-pressure dispersion apparatus.
- the high-pressure homogenizer can form a high-speed flow by pumping the slurry at a high pressure, and a shock wave can be formed by this high-speed flow.
- a shock wave By this shock wave, the agglomerated portion of the nanoparticles, the ion conductive ceramic particles, and the insulating ceramic particles in the slurry is destroyed and dispersed to the primary particle state to obtain a uniform slurry.
- the mechanical shearing force can be retained in the slurry and more uniformly dispersed.
- each step of preparing each slurry it is preferable to perform a stirring dispersion process in which each slurry is stirred and dispersed while applying a shearing force to each slurry (claims 10 and 17). And claim 24).
- the nanoparticles, the ion conductive ceramic particles, and the insulating ceramic particles are prevented from aggregating to form secondary particles.
- the particles can be dispersed.
- the particles can be more uniformly dispersed, and the uniform dispersion state can be kept stable for a long period of time.
- the uniformity of the internal composition of the solid electrolyte body and the insulator of the gas sensor element finally obtained can be further improved, and the dispersion uniformity of the nanoparticles can be improved. Therefore, a gas sensor element with excellent strength can be obtained.
- the nanoparticles, the ion conductive ceramic particles, and the insulating ceramic particles can be dispersed efficiently and continuously.
- the stirring and dispersing treatment is preferably performed by stirring each slurry in a stirring tank having a sealed pressure-resistant container and a rotary blade attached to a rotating shaft provided inside the sealed pressure-resistant container (claims). 11. Claim 18, Claim 25).
- the stirring and dispersing treatment is preferably performed at a pressure of 10 to 400 MPa.
- the slurry present at the tip of the rotating blade (the end near the inner wall surface of the sealed pressure vessel) is all stirred by the rotating blade.
- the slurry can be provided with effects such as a high degree of miniaturization, dispersion, mixing, and emulsification.
- the slurry inside and outside the rotating surface of the rotary blade is mixed due to a speed difference during the rotational motion due to the inertia of the slurry itself, generation of a vortex, and the like.
- the nanoparticle slurry, the ion-conductive ceramic slurry, the ion-conductive composite material slurry, the insulating ceramic slurry force is one or more selected. It is preferable to disperse the slurry by applying ultrasonic waves (claim 12).
- the ion conductive ceramic slurry, the nanoparticle slurry, the insulating ceramic slurry, and the insulating composite material slurry are also used. It is preferable to disperse one or more kinds of slurries selected from one by applying ultrasonic waves (claim 19).
- the ion conductive ceramic slurry, the first nanoparticle slurry, the ion conductive composite material slurry, the insulating ceramic slurry, the second nanoparticle slurry It is preferable to disperse one or more kinds of slurries selected from the above insulating composite material slurries by applying ultrasonic waves (claim 26).
- the above-mentioned ultrasonic dispersion is performed by dispersing each slurry, preparing a slurry, preparing an ion conductive slurry, preparing a complete slurry, preparing an ion conductive composite slurry, and preparing an insulating composite slurry. Step). At this time, ultrasonic dispersion is used in combination with the high-pressure dispersion treatment and the stirring dispersion treatment.
- the dispersion by ultrasonic waves may be performed by a process of forming each slurry (ion conductive ceramic forming process, insulating ceramic forming process, ion conductive composite material forming process, insulating composite material forming process) or insulating process. It can also be performed immediately before the step of baking ceramic paste or insulating composite material slurry or plasma spraying (insulating ceramic body forming step).
- the gas sensor element 1 of the present example sandwiches the solid electrolyte body 11, the insulators 15, 141, 142, 191, 195, 197, 163, 161, 162, 164, 165, and the solid electrolyte body 11.
- a pair of electrodes 121 and 131 and a heater 19 are provided.
- the solid electrolyte body 11 also has a partially stabilizing zirconium force.
- Insulators 15, 141, 142, 191, 195, 197, 163, 161, 162 164, and 165 also have an insulating composite material force in which 2 wt% of nanoparticles 10 having a particle size of lOOnm or less are dispersed in the main component of insulating ceramics having electrical insulating properties.
- the pair of electrodes 121 and 131 are the measurement gas side electrode 121 facing the measurement gas atmosphere and the reference electrode 131 facing the reference gas atmosphere, respectively.
- the solid electrolyte 11 is laminated with a gas permeable insulator (diffusion layer) 141 covering the gas-side electrode 121 to be measured, and the gas impermeable insulator (shielding layer) is deposited on the diffusion layer 141. 142 are stacked.
- the gas sensor element 1 of this example is used by being incorporated in a gas sensor installed in an exhaust system of an automobile engine. This gas sensor measures the oxygen concentration in the exhaust gas, detects the measured value engine air-fuel ratio, and uses the air-fuel ratio for engine combustion control.
- the gas sensor element 1 of this example is configured by stacking a reference gas chamber forming plate (insulator) 15, a solid electrolyte body 11, a diffusion layer 141, and a shielding layer 142. .
- the reference gas chamber forming plate 15 has a U-shaped cross section, and includes a groove 150 serving as a reference gas chamber into which the reference gas is introduced.
- the solid electrolyte body 11 includes a measured gas side electrode 121 and a reference electrode 131, and includes lead portions 122 and 132 that are electrically connected to the electrodes 121 and 131.
- a diffusion layer 141 is laminated so as to cover the measured gas side electrode 121, and a shielding layer 142 is laminated so as to cover the diffusion layer 141.
- the gas sensor element 1 of the present example is integrally provided with a ceramic heater 19 on the opposite surface of the reference gas chamber forming plate 15 to the side facing the solid electrolyte body 11.
- the ceramic heater 19 includes a heater sheet 191 and a heating element 1 provided on the heater sheet 191.
- a lead portion 182 for energizing the heating element 181 a lead portion 182 for energizing the heating element 181
- the heater insulating plate 195 has a window portion 196.
- This window part 196 includes a heating element 181 and a lead part 1
- the lead portion 182 is electrically connected to the terminal 183 through the conductive through hole 190 provided in the heater sheet 191.
- An adhesive layer 161 is provided between the heater insulating plate 197 and the reference gas chamber forming plate 15, between the reference gas chamber forming plate 15 and the solid electrolyte body 11, and between the diffusion layer 141 and the shielding layer 142. , 162, 165 intervene. An insulating layer 163 and an adhesive layer 164 are interposed between the solid electrolyte body 11 and the diffusion layer 141.
- the reference gas chamber forming plate 15, the diffusion layer 141, the heater sheet 191, the heater insulating plates 195, 197, and the insulating layer 163 and the adhesive layers 161, 162, 164, 165 are all insulated.
- These insulators are mainly composed of alumina as insulating ceramics.
- the porosity of the diffusion layer 141 is 14%.
- Each insulator 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165 is a particle size of lOOnm in the main component of each insulating ceramic (alumina). About 2 wt% of the following nanoparticles 10 are dispersed. In this example, commercially available zirconia nanoparticles (particle size of about 10 to 50 nm) were used as the nanoparticles 10.
- the solid electrolyte body 11 is composed of a partially stable zirconia obtained by adding about 6 mol% of yttria to zircoia.
- the solid electrolyte body 11 has a reference electrode 131 facing the groove 150 serving as a reference gas chamber, and the adhesive layer 162 has a window 139 at a position facing the reference electrode 131.
- the reference electrode 131 is electrically connected to the terminal 136 through the lead portion 132, the internal terminal 133, the conductive through hole 134 provided in the solid electrolyte body 11, and the conductive through hole 135 provided in the insulating layer 163. Conducted to.
- the insulating layer 163 and the adhesive layer 164 have windows 128 and 129 at positions facing the measured gas side electrode 121. Further, the measured gas side electrode 121 is electrically connected to the terminal 123 through the lead portion 122.
- the output of the gas sensor element 1 can be obtained from the terminals 123 and 136.
- the windows 128 and 129 provided in the insulating layer 163 and the adhesive layer 164 become a small chamber 127 in which the gas-side electrode 121 to be measured is stored by lamination. A gas to be measured is introduced into the small chamber 127 through the diffusion layer 141.
- the nano-slurry preparation step, the ion conductive slurry preparation step, the insulated preparation step, the insulating composite material preparation step, the ion conductive ceramics molding step, and the insulating composite material is manufactured by performing a forming process, an electrode printing portion forming process, and a firing process.
- a green sheet for the solid electrolyte body 11 is prepared from a doctor blade method or an extrusion molding method. Next, the green sheet is provided with a printing portion for forming the gas-side electrode 121 to be measured, the reference electrode 131, the lead portion 132, and the internal terminal 133. In addition, a through hole 134 is provided in advance in the green sheet for the solid electrolyte body 11.
- the green body for the reference gas chamber forming plate 15 is produced by injection molding, cutting molding, press molding, bonded molding of a green sheet, or the like.
- the green sheets for the heater sheet 191, the shielding layer 142, and the diffusion layer 141 are manufactured by a doctor blade method, an extrusion method, or the like.
- the shielding layer 142 and the diffusion layer 141 can also be made of slurry.
- the green sheet for the heater sheet 191 is provided with a printing unit for the heating element 181 and the like.
- a through hole 190 is also provided in advance.
- the various adhesive layers 161, 162, 164, 165, and the insulating layer 163 are prepared as slurry for the adhesive layer and the insulating layer, and printed on the green sheet. Those having windows 129, 139, and 128 are formed by screen printing using slurry, and heater insulating plates 195 and 197 are similarly formed by screen printing using slurry.
- the adhesive layer 165 can be removed. Further, when the diffusion layer 141 is made of slurry, it can be overlapped with the adhesive layer 164. That is, the adhesive layer 164 can be formed integrally with the diffusion layer 141. [0181]
- the reference gas chamber forming plate 15, the diffusion layer 141, the shielding layer 142, the heater sheet 191, the heater insulating plates 195 and 197, the insulating layer 163, and the adhesive layers 161, 162, 164, and 165 are formed.
- Green sheets and slurries are composed of insulating composite materials in which 2 wt% of nanoparticles 10 (zircouore nanoparticles) are dispersed in the main component of insulating ceramic (alumina), ethanol, alcohol such as 2-butanol, isoamyl alcohol acetate, sorbitan It was prepared by adding a solvent such as trioleate (SPN), polybutyrate (PVB), benzyl butyl phthalate (BBP). The green sheet was produced by forming a slurry (insulating composite material slurry) in which insulating ceramics and nanoparticles 10 were dispersed in a solvent.
- the insulating composite material slurry was prepared by mixing an insulating ceramic slurry prepared by dispersing insulating ceramics in a solvent and a nanoparticle slurry prepared by dispersing nanoparticles in a solvent.
- a green sheet for a solid electrolyte body is prepared by dispersing ion-conductive ceramics, such as partially stable zirconia, obtained by adding 6 mol% of yttria with respect to zirconia in the solvent (ion-conductive ceramic slurry). ) And the slurry was formed.
- ion-conductive ceramics such as partially stable zirconia
- each slurry was adjusted by high-pressure dispersion treatment using a high-pressure dispersion device (high-pressure homogenizer).
- the high-pressure dispersion device 4 has a mixing / dispersing part 42 provided so as to move the movable orifice 44 up and down.
- the mixing / dispersing part 42 is coupled to the storage tank 43 by pipes el, e2, and e3.
- the high-pressure dispersing device 4 is provided with a high-pressure pump 41 for driving the movable orifice 44.
- the high pressure pump 41 and the movable orifice 44 are driven by compressed air indicated by arrows dl and d2.
- each slurry is introduced from the pipe el of the high-pressure dispersion apparatus 4.
- the introduced slurry is pumped to the mixing and dispersing unit 42 and collides with the tip of the movable orifice 44 (collision unit 440) under high pressure (200 MPa).
- the slurry forms a high-speed flow, and the agglomeration portion in the slurry is broken by the impact formed by the high-speed flow, and can be dispersed to the state of primary particles.
- a mechanical shearing force is applied to the slurry, and uniform dispersion can be promoted by this shearing force.
- the slurry branches, flows out from the two outlets 421 and 422, joins in the pipe e3, and returns to the storage tank 43.
- the slurry can be circulated again from the storage tank 43 to the mixing and dispersing section 42 through the pipes e2 and el.
- the green sheets produced as described above are laminated in the order shown in Fig. 1 and pressed to adhere to each other by the adhesiveness (adhesiveness) of the adhesive layers 161, 162, 164, 165. And the unbaked laminated body was obtained. The green laminate was heated to 1470 ° C. and fired.
- the reference gas chamber forming plate 15, the diffusion layer 141, the shielding layer 14 2, the heater sheet 191, the heater insulating plates 195 and 197, the insulating layer 163, the adhesive layers 161, 162, and 1 64 165 is an insulator made of an insulating composite material. That is, the insulator is mainly composed of alumina, and nanoparticles 10 having a particle size of lOOnm or less are dispersed in the main component.
- the insulators 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165 can withstand large stresses exceeding 350 MPa, for example, and exhibit excellent strength. be able to. Therefore, even if the gas sensor element gets wet and a large stress is generated on the insulator, the insulator 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165 is prevented from being damaged. can do. Accordingly, it is possible to prevent the accuracy of measurement of various gas concentrations by the gas sensor element 1 from being impaired.
- the insulating layer 163, the adhesive layers 164 and 165, and the diffusion layer 141, the shielding layer 142, and the reference gas that are in direct contact with a gas such as exhaust gas during operation are used.
- the reference gas chamber forming plate 15 and the adhesive layer 162 that come into contact with each other, and the heater sheet 191 and the heater insulating plates 195 and 197 of the heater 19 that easily change in temperature and come into contact with the outside air are the above-mentioned insulating composite materials. ing.
- various gases such as exhaust gas, air, reference gas, and various insulators 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165
- various insulators exhibit excellent strength as described above, so that it is possible to prevent the occurrence of cracks and breakage.
- the nanoparticles 10 are dispersed by 2 wt% in the main component of alumina. for that reason Insulators 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, and 165 are sufficiently insulated.
- the gas sensor element 1 can exhibit excellent strength while sufficiently securing the function as the gas sensor element. Therefore, even if a large stress is applied to the gas sensor element 1, it is possible to prevent breakage such as cracking. Therefore, the gas sensor element 1 can perform accurate detection and has excellent reliability.
- This example is an example of a bottomed cylindrical and cup-type oxygen concentration electromotive force type gas sensor element 2 as shown in FIG.
- This element is built in the oxygen sensor as shown in FIG.
- This oxygen sensor is installed in the exhaust pipe of an automobile engine and detects the oxygen concentration force air-fuel ratio in the exhaust gas that is closely related to the air-fuel ratio of the air-fuel mixture supplied for combustion.
- the gas sensor element 2 includes a solid electrolyte body 20 and a pair of gas side electrodes 22 to be measured and a reference gas side electrode 21 provided on the solid electrolyte body 20.
- An electrochemical cell is constructed. This cell measures the oxygen concentration in the exhaust gas.
- a porous protective layer 23 that protects the measured gas side electrode 22 and controls the diffusion of the measured gas, and a porous protective layer 24 that covers the porous protective layer 23 are provided.
- the porous protective layers 23 and 24 are porous insulators formed by thermal spraying of MgO ⁇ ⁇ 1203 spinel.
- the solid electrolyte body 20 is mainly composed of partially stabilized zirconium oxide, which is an ion conductive ceramic, in which nanoparticles 28 having alumina force are dispersed.
- the porous protective layers (insulators) 23 and 24 are mainly composed of alumina, which is an insulating ceramic, more specifically A1203 ⁇ MgO.
- the nanoparticles 29 are dispersed.
- FIG. 7 shows an oxygen sensor 3 incorporating the gas sensor element 2 of this example.
- the oxygen sensor 3 includes a gas sensor element 2 forming an electrochemical cell and the gas sensor element. And a housing 32 for housing the child 2.
- the housing 32 has a body portion 33 provided with a flange 331 at a substantially central portion thereof, and has an exhaust cover 34 inserted into an exhaust pipe of an automobile engine below the body portion 33.
- Part 3
- the exhaust cover 34 has an inner cover 341 and an outer cover 342 made of stainless steel, and the inner cover 341 and the outer cover 342 have exhaust gas inlets 343 and 344, respectively.
- the atmospheric cover 35 includes a main cover 351 attached to the body portion 33 and a sub-cover 352 that covers the rear end of the main cover 351, and the main cover 351 and the sub-cover 352 are provided. Has an air intake not shown.
- the gas sensor element 2 is sandwiched between the inside of the housing 32 of the oxygen sensor 3 via an insulating member 332.
- the gas sensor element 2 is sandwiched between the terminal portion extending from the reference gas side electrode 21 and the terminal portion extending from the measured gas side electrode 22 (both not shown) so as to wrap them.
- Metal plate terminals 361 and 362 were provided.
- the plate terminals 361 and 362 were connected to output lead wires 371 and 372, respectively.
- the strip-like terminal pieces 363 and 364 are provided so as to protrude from the contact pieces 365 and 366.
- the terminal pieces 363 and 364 were connected to the one ends 385 and 386 of the connectors 381 and 382 in which the other ends 383 and 384 were connected to the lead wires 371 and 372, respectively.
- the plate terminals 361 and 362 are formed by transforming an inverted T-shaped metal plate into a cylindrical shape, extending from the reference gas side electrode 21 and extending from the measured gas side electrode 22 Pinched pinned part.
- the lead wires 371 and 372 have a tensile force acting in the axial direction of the oxygen sensor 2, so that the plate terminals 361 and 362 are pulled through the connectors 381 and 382. , May slide in the axial direction.
- the end of the oxygen sensor 3 is sandwiched between rubber bushes 391 and 392.
- a rare stopper 393 was provided.
- the Stotto 393 is made of a grease material for suppressing the movement of the connectors 381 and 382 and maintaining insulation between the lead wires 371 and 372.
- Reference numeral 373 is a wire for energizing a heater for heating the gas sensor element 2.
- the exhaust cover 34 was inserted into the exhaust pipe of the automobile engine, and fixed to the exhaust pipe of the automobile engine by the flange 331.
- the oxygen sensor 3 which has the above-described configuration is provided with a reference gas side electrode 21 and a measured gas side electrode 22 on both surfaces of a solid electrolyte body 20 which is an oxygen ion conductor as shown in FIG.
- Built-in gas sensor element 2 that constitutes a chemical cell, exposing the gas side electrode 22 to be measured to exhaust gas, exposing the reference gas side electrode 21 to the atmosphere, and the potential difference between the electrodes caused by the difference in oxygen concentration in the atmosphere to which both are exposed The air-fuel ratio is detected from the force.
- the ion conductive slurry preparation step, the first nano slurry preparation step, the insulating slurry preparation step, the second nano slurry preparation step, the ion conductive composite material preparation step, the insulating composite material preparation step, the ion A gas sensor element is manufactured by performing a conductive composite material forming step, a firing step, an electrode forming step, and an insulating ceramic body forming step.
- an ion conductive composite material slurry was prepared by mixing the ion conductive ceramic slurry and the first nanoparticle slurry.
- ion conductive composite material slurry ion conductive ceramics and first nanoparticles are dispersed in a solvent.
- the ion conductive composite material slurry was formed into a cup shape and fired to produce a solid electrolyte body 20.
- platinum was attached to the inner and outer surfaces of the solid electrolyte body 20 by electroless plating, and this was heat-treated to form the reference gas side electrode 21 and the measured gas side electrode 22.
- the porous protective layer 23 was formed using an insulating composite material slurry in which 2 wt% of nanoparticles 29 were dispersed in a main component made of A1203′MgO spinel.
- the insulating composite material slurry consists of insulating ceramic slurry in which 99 parts by weight of insulating ceramics (A1203 'MgO spinel) is dispersed in an appropriate amount of solvent, and 1 part by weight of nanoparticles dispersed in an appropriate amount of solvent. Prepared by mixing with 2 nanoparticle slurry. Further, as the nanoparticles 29, commercially available zircoyu nanoparticles (particle size: about 10 to 50 nm) were used as in Example 1.
- the insulating composite material slurry is deposited by dipping or spraying so as to cover the porous protective layer 23, dried, and then baked at 500 ° C to 900 ° C in a non-acidic atmosphere.
- a porous protective layer 24 was formed.
- each slurry was adjusted by a stirring dispersion process using a high-speed shear mixer provided with a stirring tank having a hermetic pressure vessel and stirring blades.
- the high-speed shear mixer 5 has a stirring vessel 51 including a hermetic pressure vessel 514 and a rotary blade 513 that is rotatably attached to a rotary shaft 512 therein. ing.
- the sealed pressure vessel 514 is formed with a flow channel inlet 515 and a flow channel outlet 516 that serve as a slurry inlet and outlet to the sealed pressure vessel 514.
- the rotating shaft 512 is arranged concentrically with the sealed pressure vessel 514, and one end of the rotating shaft 512 is connected to a high-speed motor 511 outside the sealed pressure vessel.
- the rotating blade 513 has a slightly smaller diameter than the inner diameter of the sealed pressure vessel 514.
- a relatively large force is shown to make the gap between the rotary blade 512 and the sealed pressure vessel easy to move. Actually, this gap is about 2 mm.
- the high-speed shear mixer 5 further includes a storage tank 52 and a pump device 53.
- the stirring tank 51, the storage tank 52, and the pump device 53 are connected by pipes al to a4.
- the high-speed shear mixer 5 has a cooling section 54 on the outer surface of the sealed pressure vessel 514 as shown in FIG. By causing the cooling water bl and b2 to flow through the cooling unit 54, it is possible to suppress the inside of the sealed pressure resistant vessel 514 from becoming high temperature.
- the slurry When the slurry is pumped to the high-speed shear mixer 5, the slurry circulates between the sealed pressure vessel 514, the storage tank 52, and the pump device 53 connected by the flow paths al to a4. The slurry rotates in response to the energy of the rotary blade 513 in the sealed container 514 and is pressed against the inner surface of the sealed pressure-resistant container 514 by centrifugal force.
- the rotation of the slurry occurs not only in the portion in contact with the rotating blade 513 but also in the portion away from the rotating blade 513 as the slurry rotated by the rotating blade 513 moves.
- the rotational speed of the rotary blade 513 is larger than the rotational speed of the slurry. Since the gap between the sealed pressure vessel 514 and the rotary blade 513 is small, the slurry existing near the end of the rotary blade 513 is stirred by the rotary blade 513. The This makes it highly refined and produces actions such as dispersion 'mixing' emulsification.
- the slurry inside and outside the rotating surface of the rotary blade 513 is also subjected to actions such as dispersion, mixing, and emulsification due to a difference in speed during the rotating motion due to the inertia of the slurry itself, and generation of vortex.
- the slurry is dispersed and mixed while circulating between the sealed pressure vessel 514, the storage tank 52, and the pump device 53, and as a result, a uniformly dispersed and mixed slurry can be obtained. it can.
- the slurry is uniformly dispersed by the same operation as in Example 1.
- each slurry is pumped at a high pressure to form a high-speed flow, and a shock wave is formed by this high-speed flow.
- the shock wave destroys the agglomerated portions of the nanoparticles, the particles of the ion conductive ceramics, and the particles of the insulating ceramics in the slurry, and disperses them to a primary particle state, thereby obtaining a uniform slurry.
- the porous protective layers 23 and 24 that are insulators also have the insulating composite material force as in the first embodiment. That is, in the porous protective layers 23 and 24, the nanoparticles 29 are dispersed in the main component of the insulating ceramic (A1203′MgO).
- the solid electrolyte body 20 also serves as the ion conductive composite material. That is, in the solid electrolyte body 20, ion conductive ceramics (partially reduced Nanoparticles 28 are dispersed in the main component of Zircoyu).
- the porous protective layers 23 and 24 and the solid electrolyte body 20 can exhibit excellent strength.
- the porous protective layers 23 and 24 are easily in contact with the exhaust gas. Therefore, the porous protective layers 23 and 24 are easily wetted with moisture contained in the exhaust gas. As a result, a large stress may be generated in the porous body protective layers 23 and 24.
- the solid electrolyte body 20 is likely to come into contact with the exhaust gas that has passed through the porous protective layers 23 and 24. Therefore, the solid electrolyte body 20 is likely to be wetted by moisture contained in the exhaust gas when a sudden temperature change or the like of the gas sensor element 2 occurs. As a result, a large stress may be generated in the solid electrolyte body 20.
- the porous protective layers 23 and 24 are made of the insulating composite material and the solid electrolyte body 20 is made of the ion conductive composite material as described above, it can exhibit excellent strength. it can. Therefore, even if stress is applied by the above-described water exposure, the solid electrolyte body 20 and the porous protective layers 23 and 24 exhibit excellent resistance to stress and can prevent the occurrence of cracks and the like. it can.
- This example is an example in which an insulator made of an insulating composite material similar to that in Example 1 and Example 2 is manufactured and its strength is examined.
- the insulator of the present example has a strength of an insulating composite material in which nanoparticles are dispersed in a main component of alumina.
- a plurality of insulators having different mixing ratios of nanoparticles are prepared, and the strengths of these insulators are compared and evaluated.
- nanoparticles commercially available zircouore nanoparticles (average particle size 10 to 50 nm ) were prepared. Next, the nanoparticles and alumina g were weighed to give a total lOOg in the proportions shown in Table 1 described later, and 150 g of ion-exchanged water was weighed, placed in a 2 liter pot, and mixed for 3 hours in a ball mill. Thereafter, the mixture was dried in an evaporating dish at a temperature of 150 ° C for about 20 hours.
- the plate-like molded body was fired, and both ends of the sintered body were cut. Thereafter, polishing was performed to produce an insulator having a thickness of 3 mm, a width of 4 mm, and a length of 50 mm.
- Sample E1 was prepared as described above with an alumina blending amount of 99.9 g and a nanoparticle blending amount of 0.1 lg.
- Sample E2 was prepared in the same manner as Sample E1, except that the blending amount of alumina was 99.8 g and the blending amount of nanoparticles was 0.2 g.
- Sample E3 was prepared in the same manner as Sample E1, except that the blending amount of alumina was 99.5 g and the blending amount of nanoparticles was 0.5 g.
- Sample E4 was prepared in the same manner as Sample E1 except that the amount of alumina was 99 g and the amount of nanoparticles was lg.
- Sample E5 was prepared in the same manner as Sample E1 except that the amount of alumina was 98 g and the amount of nanoparticles was 2 g.
- Sample E6 was prepared in the same manner as Sample E1 except that the blending amount of alumina was 95 g and the blending amount of nanoparticles was 5 g.
- Sample E7 was prepared in the same manner as Sample E1 except that the amount of alumina was 90 g and the amount of nanoparticles was 10 g.
- Sample E8 was prepared in the same manner as Sample E1 except that the blending amount of alumina was 85 g and the blending amount of nanoparticles was 15 g.
- Sample E9 was prepared in the same manner as Sample E1 except that the blending amount of alumina was 80 g and the blending amount of nanoparticles was 20 g.
- Sample C2 as a comparative example has an alumina compounding amount of 99.95 g and a nanoparticle compounding amount of 0.
- the sample was prepared in the same manner as the sample E1 except for the point of 05g.
- Sample C3 as a comparative example has an alumina content of 70 g and a nanoparticle content of 30 g. Except for the above points, it was produced in the same manner as the sample El.
- Sample C4 as a comparative example was prepared in the same manner as Sample E1 except that the blending amount of alumina was 50 g and the blending amount of nanoparticles was 50 g.
- Sample C1 was prepared in the same manner as Sample E1, except that the blending amount of alumina was lOOg and the blending amount of nanoparticles was Og.
- the bending strength was measured using a pressurizer 6 with a load cell as shown in FIG.
- the lower pressure body 62 is provided with two convex portions 625 with a distance of Llmm
- the upper pressure body 61 is provided with two convex portions 615 with a distance of L2mm.
- the insulator 7 is disposed such that the center in the longitudinal direction (length direction) is at the center of the distance between the convex portions 625 of the lower pressurizing body 62 and the center of the distance between the convex portions 615 of the upper pressurizing body 61.
- Folding strength S is calculated from the load P at the time of fracture, the distance L1 between the protrusions of the lower pressure body, the distance L2 between the protrusions of the upper pressure body, the width of the sample, and the thickness t of the sample. It can be calculated by the equation (1).
- the thermal expansion coefficient is THERMO MECHANICAL ANAL manufactured by Shimadzu Corporation.
- YZER (TMA-50) was used and measured in the temperature range from room temperature to 900 ° C.
- the insulator (sample E1 to sample E9) in which nanoparticles are appropriately dispersed as shown in sample El to sample E9 contains nanoparticles! / It can be seen that C1) and the nanoparticle content are higher than those of the insulators outside the scope of the present invention (samples C2 to C4), and show a bending strength.
- Samples E1 to E9 exhibited thermal expansion coefficients almost the same as those of sample C1, which also has alumina force (see Table 1).
- the insulator made of alumina (sample C1) has been widely used as an insulator for conventional gas sensor elements!
- the sample C1 and sample E9 have the same thermal expansion coefficient as the sample C1.
- the sample E1 to sample E9 can be easily calibrated without greatly changing the configuration of the gas sensor element. It can be applied to a sensor element.
- This example relates to a gas sensor 3 in which the configuration of Example 1 shown in FIGS. 1 to 3 is partially changed.
- an insulating layer 163, an insulator 191, an adhesive layer 162, an insulating printed layer 200, 201, which will be described later, are mainly composed of alumina, and other insulators 15, 141, 142, 191, 195, 197, 161, 164, 165 and the solid electrolyte body 11 are composed of dinorequoia as a main component.
- the gas sensor element 3 of the present example sandwiches the solid electrolyte body 11, the insulators 15, 141, 142, 191, 195, 197, 163, 161, 162, 164, 165, and the solid electrolyte body 11.
- a pair of electrodes 121 and 131 formed as described above and a heater 19 are provided.
- the solid electrolyte body 11 also has a partially stable zirconia force.
- the insulators 195, 163, 161, and 162 are insulating composite materials in which 2 wt% of nanoparticles 10 having a particle size of lOOnm or less are dispersed in the main component of insulating ceramics having electrical insulating properties.
- the insulating printed layers 200 and 201 are formed on the heat generator 181 and the lead portion 182 side of the insulators 191 and 197, respectively.
- the insulating printed layers 200 and 201 are also insulators, and formed an insulating composite material force in which 2 wt% of nanoparticles 10 having a particle size of lOOnm or less were dispersed in the main component of insulating ceramics having electrical insulating properties.
- the pair of electrodes 121 and 131 are the measurement gas side electrode 121 facing the measurement gas atmosphere and the reference electrode 131 facing the reference gas atmosphere, respectively.
- the solid electrolyte 11 is laminated with a gas permeable insulator (diffusion layer) 141 covering the gas-side electrode 121 to be measured, and the gas impermeable insulator (shielding layer) is deposited on the diffusion layer 141.
- a force which is an embodiment of a one-cell type AZF sensor provided with a pair of electrodes 121 and 131 formed so as to sandwich the solid electrolyte body 11, and another pair formed so as to sandwich another solid electrolyte. This can also be applied when using a 2-cell AZF sensor equipped with these electrodes. Furthermore, it can be applied not only to AZF sensors but also to 02 sensors and NOx sensors.
- the gas sensor element 3 of this example is used by being incorporated in a gas sensor installed in an exhaust system of an automobile engine. This gas sensor measures the oxygen concentration in the exhaust gas, The air-fuel ratio is detected and used for engine combustion control.
- the gas sensor element 3 of this example includes a reference gas chamber forming plate (insulator) 15, a solid electrolyte body 11, a diffusion layer 141, and a shielding layer 142. It is constructed by stacking.
- the reference gas chamber forming plate 15 has a U-shaped cross section and a groove 150 serving as a reference gas chamber into which the reference gas is introduced.
- the solid electrolyte body 11 includes a measured gas side electrode 121 and a reference electrode 131, and includes lead portions 122 and 132 that are electrically connected to the electrodes 121 and 131.
- a diffusion layer 141 is laminated so as to cover the measured gas side electrode 121, and a shielding layer 142 is laminated so as to cover the diffusion layer 141.
- the gas sensor element 3 of the present example is integrally provided with a ceramic heater 19 on the opposite surface of the reference gas chamber forming plate 15 on the side facing the solid electrolyte body 11.
- the ceramic heater 19 includes a heater sheet 191 and a heating element 1 provided on the heater sheet 191.
- a lead portion 182 for energizing the heating element 181 a lead portion 182 for energizing the heating element 181
- the heater insulating plate 195 has a window portion 196.
- This window part 196 includes a heating element 181 and a lead part 1
- It is the same shape as 82, and can be embedded in both, and is provided to smooth the unevenness when the heating element 181 and the lead portion 182 are sandwiched between the heater sheet 191 and the heater insulating plate 197.
- the lead part 182 is electrically connected to the terminal 183 through the conductive through hole 190 provided in the heater sheet 191.
- An adhesive layer 161 is provided between the heater insulating plate 197 and the reference gas chamber forming plate 15, between the reference gas chamber forming plate 15 and the solid electrolyte body 11, and between the diffusion layer 141 and the shielding layer 142. , 1
- An insulating layer 163 and an adhesive layer 164 are interposed between the solid electrolyte body 11 and the diffusion layer 141.
- the reference gas chamber forming plate 15, the diffusion layer 141, the heater sheet 191, the heater insulating plates 195 and 197, and the adhesive layers 161, 164 and 165 are all insulators, and these insulators. Is mainly composed of zircouore as insulating ceramics. [0290] The insulating layer 163 and the adhesive layer 162 are mainly composed of alumina as insulating ceramics.
- the porosity of the diffusion layer 141 is 14%.
- Nanoparticles 10 are dispersed about 2 wt%.
- commercially available alumina nanoparticles particles size: about 10 to 50 nm were used as the nanoparticles 10.
- nanoparticles 10 having a particle size of lOOnm or less is dispersed in the main component of each insulating ceramic (alumina).
- alumina insulating ceramic
- the solid electrolyte body 11 is composed of a partially stable zircouire obtained by adding 6 mol% of yttria to zircouire.
- the solid electrolyte body 11 has a reference electrode 131 facing the groove 150 serving as a reference gas chamber, and the adhesive layer 162 has a window 139 at a position facing the reference electrode 131.
- the reference electrode 131 is electrically connected to the terminal 136 through the lead portion 132, the internal terminal 133, the conductive through hole 134 provided in the solid electrolyte body 11, and the conductive through hole 135 provided in the insulating layer 163. Conducted to.
- the insulating layer 163 and the adhesive layer 164 have windows 128 and 129 at positions facing the measured gas side electrode 121. Further, the measured gas side electrode 121 is electrically connected to the terminal 123 through the lead portion 122.
- the output of the gas sensor element 3 can be obtained from the terminals 123 and 136.
- the windows 128 and 129 provided in the insulating layer 163 and the adhesive layer 164 become a small chamber 127 for storing the gas-side electrode 121 to be measured by lamination.
- a gas to be measured is introduced into the small chamber 127 through the diffusion layer 141.
- nano slurry preparation step, ion conductive slurry preparation step, complete rally preparation step, insulating composite material preparation step, and ion conductive ceramic A gas sensor element is manufactured by performing a molding process, an insulating composite material molding process, an electrode printing portion forming process, and a firing process.
- a green sheet for the solid electrolyte body 11 is prepared from a doctor blade method or an extrusion molding method. Next, the green sheet is provided with a printing portion for forming the gas-side electrode 121 to be measured, the reference electrode 131, the lead portion 132, and the internal terminal 133. In addition, a through hole 134 is provided in advance in the green sheet for the solid electrolyte body 11.
- the green body for the reference gas chamber forming plate 15 is produced by injection molding, cutting molding, press molding, bonded molding of a green sheet, or the like.
- the green sheets for the heater sheet 191, the shielding layer 142, and the diffusion layer 141 are manufactured by a doctor blade method, an extrusion method, or the like.
- the shielding layer 142 and the diffusion layer 141 can also be made of slurry.
- the green sheet for the heater sheet 191 is provided with a printing unit for the heating element 181 and the like.
- a through hole 190 is also provided in advance.
- the adhesive layers 161, 162, 164, 165, and the insulating layer 163 are prepared as slurry for the adhesive layer and the insulating layer, and printed on the green sheet. Those having windows 129, 139, and 128 are formed by screen printing using slurry, and heater insulating plates 195 and 197 are similarly formed by screen printing using slurry.
- 1 is formed by screen printing using a slurry.
- the adhesive layer 165 can be removed. Further, when the diffusion layer 141 is made of slurry, it can be overlapped with the adhesive layer 164. That is, the adhesive layer 164 can be formed integrally with the diffusion layer 141.
- an alcohol such as ethanol, 2-butanol, isoamyl alcohol acetate, sorbitan trioleate (SPN), polybutyl butyrate HPVB), benzyl butyl phthalate (BBP), and the like were prepared on the insulating composite material.
- the Darene sheet was produced by forming a slurry (insulating composite material slurry) in which insulating ceramics and nanoparticles 10 were dispersed in a solvent.
- the insulating composite material slurry was prepared by mixing an insulating ceramic slurry prepared by dispersing insulating ceramics in a solvent and a nanoparticle slurry prepared by dispersing nanoparticles in a solvent.
- the printing slurry for forming the insulating layer 163 and the adhesive layer 162 is an insulating composite material in which 2 wt% of nanoparticles 10 (zircouore nanoparticles) are dispersed in a main component made of insulating ceramic (alumina). It was prepared by adding a solvent such as ethanol, alcohol such as 2-butanol, isoamyl alcohol acetate, sorbitan trioleate (SPN), polybutyrate (PVB), benzyl butyrate (BBP).
- a solvent such as ethanol, alcohol such as 2-butanol, isoamyl alcohol acetate, sorbitan trioleate (SPN), polybutyrate (PVB), benzyl butyrate (BBP).
- the insulating composite material slurry in this case was prepared by mixing an insulating ceramic slurry prepared by dispersing insulating ceramics in a solvent and a nanoparticle slurry prepared by dispersing nanoparticles in a solvent. .
- the printing slurry for forming the insulating printed layers 200 and 201 was obtained by dispersing 2 wt% of nanoparticles 10 (zirconia nanoparticles) in a main component such as insulating ceramic (alumina).
- the insulating composite material was prepared by adding an alcohol such as ethanol or 2-butanol, a solvent such as isoamyl alcohol acetate, sorbitan trioleate (SPN), polybutyrate (PVB), or benzyl butyrate (BBP).
- the insulating composite material slurry in this case was prepared by mixing an insulating ceramic slurry prepared by dispersing insulating ceramics in a solvent and a nanoparticle slurry prepared by dispersing nanoparticles in a solvent. .
- the green sheet for the solid electrolyte body is obtained by dispersing ion-conductive ceramics such as partially stable zirconia in which 6 mol% of yttria is added to zirconia in the above solvent.
- ion-conductive ceramics such as partially stable zirconia in which 6 mol% of yttria is added to zirconia in the above solvent.
- Each slurry was prepared by high-pressure dispersion treatment using a high-pressure dispersion device (high-pressure homogenizer).
- the high-pressure dispersion device 4 has a mixing / dispersing portion 42 provided so that the movable orifice 44 is moved up and down.
- the mixing / dispersing part 42 is coupled to the storage tank 43 by pipes el, e2, and e3.
- the high-pressure dispersing device 4 is provided with a high-pressure pump 41 for driving the movable orifice 44.
- the high pressure pump 41 and the movable orifice 44 are driven by compressed air indicated by arrows dl and d2.
- each slurry is introduced from the pipe el of the high-pressure dispersion apparatus 4.
- the introduced slurry is pumped to the mixing and dispersing unit 42 and collides with the tip of the movable orifice 44 (collision unit 440) under high pressure (200 MPa).
- the slurry forms a high-speed flow, and the agglomeration portion in the slurry is broken by the impact formed by the high-speed flow, and can be dispersed to the state of primary particles.
- a mechanical shearing force is applied to the slurry, and uniform dispersion can be promoted by this shearing force.
- the slurry branches, flows out from the two outlets 421 and 422, joins in the pipe e3, and returns to the storage tank 43.
- the slurry can be circulated again from the storage tank 43 to the mixing and dispersing section 42 through the pipes e2 and el.
- the reference gas chamber forming plate 15, the diffusion layer 141, the shielding layer 142, the heater sheet 191, the heater insulating plates 195, 197, the adhesive layers 161, 164, 165 insulating composite material cover This is an insulator.
- the insulator is mainly composed of zirconia, and nanoparticles 10 having a particle size of lOOnm or less are dispersed in the main component.
- the insulating layer 163 and the adhesive layer 162 are insulating materials such as an insulating composite material.
- the insulating printed layers 200 and 201 are mainly composed of alumina, and nanoparticles 10 having a particle size of lOOnm or less are dispersed in the main component.
- insulators 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165, 200, 201 can withstand large stresses exceeding 350 MPa, for example, and have excellent strength Can be demonstrated. Therefore, even if the gas sensor element gets wet and a large stress S is generated on the insulator, the insulator 15, 141, 142, 191, 195, 197, 161, 162, 163, 164, 165, 200, 201 Can be prevented from being damaged. Accordingly, it is possible to prevent the accuracy of measurement of various gas concentrations by the gas sensor element 3 from being impaired.
- the insulating layer 163, the adhesive layers 164 and 165, and the diffusion layer 141, the shielding layer 142, and the reference gas that are in direct contact with the gas such as exhaust gas during operation are used.
- the reference gas chamber forming plate 15 and the adhesive layer 162 that come into contact with each other, and the heater sheet 191 and the heater insulation plates 195 and 197 of the heater 19 that easily change in temperature and come into contact with the outside air are the above-mentioned insulating composite materials. ing. Therefore, the parts where various gases such as exhaust gas, air, reference gas, etc.
- insulators 162, 163, 200, and 201 2 wt% of nanoparticles 10 are dispersed in the main component of alumina. Therefore, the insulation of the insulators 162, 163, 200, and 201 is sufficiently ensured.
- the gas sensor element 3 can exhibit excellent strength while sufficiently securing the function as the gas sensor element. Therefore, even if a large stress is applied to the gas sensor element 3, the occurrence of breakage such as cracking can be prevented. Therefore, the gas sensor element 3 can perform accurate detection and has excellent reliability.
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- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Conductive Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/994,093 US20090084673A1 (en) | 2005-06-30 | 2006-06-29 | Gas sensor element and method for manufacturing same |
DE112006001721T DE112006001721T5 (de) | 2005-06-30 | 2006-06-29 | Gassensorelement und Verfahren zur Herstellung desselben |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-191358 | 2005-06-30 | ||
JP2005191358 | 2005-06-30 | ||
JP2006104354 | 2006-04-05 | ||
JP2006-104354 | 2006-04-05 | ||
JP2006167060A JP4855842B2 (ja) | 2005-06-30 | 2006-06-16 | ガスセンサ素子及びその製造方法 |
JP2006-167060 | 2006-06-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007004500A1 true WO2007004500A1 (ja) | 2007-01-11 |
Family
ID=37604368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/312968 WO2007004500A1 (ja) | 2005-06-30 | 2006-06-29 | ガスセンサ素子及びその製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090084673A1 (ja) |
JP (1) | JP4855842B2 (ja) |
DE (1) | DE112006001721T5 (ja) |
WO (1) | WO2007004500A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2082870A3 (en) * | 2008-01-28 | 2012-05-23 | NGK Insulators, Ltd. | Method of forming laminated body and method of manufacturing sensor element |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7975537B2 (en) * | 2008-04-25 | 2011-07-12 | Delphi Technologies, Inc. | Systems and methods for sensing an ammonia concentration in exhaust gases |
JP4724772B2 (ja) * | 2009-02-06 | 2011-07-13 | 株式会社日本自動車部品総合研究所 | ガスセンサ用固体電解質、その製造方法、及びそれを用いたガスセンサ |
US8461462B2 (en) * | 2009-09-28 | 2013-06-11 | Kyocera Corporation | Circuit substrate, laminated board and laminated sheet |
JP5693421B2 (ja) * | 2011-09-02 | 2015-04-01 | 株式会社日本自動車部品総合研究所 | 積層型ガスセンサ素子および積層型ガスセンサ |
JP6964532B2 (ja) * | 2018-02-14 | 2021-11-10 | 日本特殊陶業株式会社 | ガスセンサ素子、及びそれを備えたガスセンサ |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63200054A (ja) * | 1987-02-16 | 1988-08-18 | Ngk Insulators Ltd | 酸素センサ素子及びその製造方法 |
JP2004296142A (ja) * | 2003-03-25 | 2004-10-21 | Kyocera Corp | セラミックヒータおよびそれを用いた検出素子 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2703207B2 (ja) * | 1995-01-30 | 1998-01-26 | 松下電工株式会社 | ジルコニア系複合セラミック焼結体及びその製法 |
GB2305430B (en) * | 1995-09-21 | 1997-08-27 | Matsushita Electric Works Ltd | Zirconia based ceramic material and process of making the same |
-
2006
- 2006-06-16 JP JP2006167060A patent/JP4855842B2/ja not_active Expired - Fee Related
- 2006-06-29 US US11/994,093 patent/US20090084673A1/en not_active Abandoned
- 2006-06-29 WO PCT/JP2006/312968 patent/WO2007004500A1/ja active Application Filing
- 2006-06-29 DE DE112006001721T patent/DE112006001721T5/de not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63200054A (ja) * | 1987-02-16 | 1988-08-18 | Ngk Insulators Ltd | 酸素センサ素子及びその製造方法 |
JP2004296142A (ja) * | 2003-03-25 | 2004-10-21 | Kyocera Corp | セラミックヒータおよびそれを用いた検出素子 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2082870A3 (en) * | 2008-01-28 | 2012-05-23 | NGK Insulators, Ltd. | Method of forming laminated body and method of manufacturing sensor element |
US8226784B2 (en) * | 2008-01-28 | 2012-07-24 | Ngk Insulators, Ltd. | Method of forming laminated body and method of manufacturing sensor element |
Also Published As
Publication number | Publication date |
---|---|
JP4855842B2 (ja) | 2012-01-18 |
US20090084673A1 (en) | 2009-04-02 |
JP2007298490A (ja) | 2007-11-15 |
DE112006001721T5 (de) | 2008-09-04 |
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