JP2647894B2 - Oxygen detection element - Google Patents
Oxygen detection elementInfo
- Publication number
- JP2647894B2 JP2647894B2 JP63052321A JP5232188A JP2647894B2 JP 2647894 B2 JP2647894 B2 JP 2647894B2 JP 63052321 A JP63052321 A JP 63052321A JP 5232188 A JP5232188 A JP 5232188A JP 2647894 B2 JP2647894 B2 JP 2647894B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- layers
- solid electrolyte
- oxygen
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、例えば内燃機関や各種燃焼機器等の排ガス
中の酸素濃度の測定する酸素検出素子に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oxygen detection element for measuring an oxygen concentration in exhaust gas of, for example, an internal combustion engine or various combustion devices.
［従来の技術］ 従来より、内燃機関や各種燃焼機器等の空燃比を制御
するために、排ガス等の測定ガス中の酸素濃度を検出す
る酸素検出素子が用いられている。[Related Art] Conventionally, an oxygen detecting element for detecting an oxygen concentration in a measurement gas such as an exhaust gas has been used in order to control an air-fuel ratio of an internal combustion engine, various combustion devices, and the like.
このような酸素検出素子として、ジルコニア等の酸素
イオン伝導性固体電解質体の一方の面に大気等の基準酸
素源に晒される基準ガス側多孔質電極を設けると共に、
他方の面に周囲雰囲気に晒される測定ガス側多孔質電極
を設けたものがある。As such an oxygen detection element, while providing a reference gas side porous electrode exposed to a reference oxygen source such as air on one surface of an oxygen ion conductive solid electrolyte body such as zirconia,
There is one in which a measurement gas side porous electrode exposed to the surrounding atmosphere is provided on the other surface.
この酸素検出素子は製造が容易であるために、例え
ば、以下の及びのように各層を積層して製造される
ものが多い。Since the oxygen detecting element is easy to manufacture, many of them are manufactured by laminating each layer as described below.
固体電解質板のグリーンシートの表裏面に電極パタ
ーンを印刷し、次いで電極部に対応する開口部を有する
触媒担持層及び保護層等を積層し、このように形成され
た積層体を、一端が閉じられ、側面に連通孔を有する筒
状碍管に捲回し、焼成することによって筒体酸素検出素
子として製造する。An electrode pattern is printed on the front and back surfaces of the green sheet of the solid electrolyte plate, and then a catalyst supporting layer having an opening corresponding to the electrode portion, a protective layer, and the like are laminated, and the thus formed laminate is closed at one end. Then, it is wound as a cylindrical insulator tube having a communication hole on the side surface and fired to produce a tubular oxygen detecting element.
固体電解質板のグリーンシートの表裏面に電極パタ
ーンを印刷し、次いで電極部に対応する開口部を有する
触媒担持層及び保護層等を積層し、このように形成され
た積層体と、基準ガス導入路形成体等を組み合わせて、
焼成することによって板状酸素検出素子として製造す
る。An electrode pattern is printed on the front and back surfaces of the green sheet of the solid electrolyte plate, and then a catalyst supporting layer having a hole corresponding to the electrode portion, a protective layer, and the like are laminated. Combining road forming bodies, etc.
It is manufactured as a plate-shaped oxygen detecting element by firing.
［発明が解決しようとする課題］ しかし、上記のように積層によって製造された酸素検
出素子は、製造時の脱脂工程、焼成工程における収縮の
際に、特に多孔質電極に対応する開口部における積層端
面の接合部にキレがはいりやすい。[Problems to be Solved by the Invention] However, the oxygen detecting element manufactured by the lamination as described above, when shrinking in the degreasing step and the baking step in the production, particularly in the opening corresponding to the porous electrode, It is easy to break the joint at the end face.
この理由を検討したところ、従来の酸素検出素子は、
積層された各層の端面が特に上記開口部において一致し
ているため、脱脂工程、焼成工程等の収縮を伴う工程
で、各層の収縮差による応力が上記端面に加わるためで
あることがわかった。After examining the reason, the conventional oxygen detection element
It has been found that since the end faces of the stacked layers are particularly coincident with each other in the opening, stress due to a difference in shrinkage of each layer is applied to the end face in a step involving shrinkage such as a degreasing step and a baking step.
本発明は、酸素検出素子を積層によって製造する際
に、上記積層端面にキレが生じない構成の酸素検出素子
の提供を課題とする。It is an object of the present invention to provide an oxygen detection element having a configuration in which the end faces of the stacked layers are not sharpened when the oxygen detection elements are manufactured by lamination.
［課題を解決するための手段］ 上記課題を解決するための本発明の要旨は、表裏面に
一対の多孔質電極を有する酸素イオン伝導性の固体電解
質体からなる部材と、 該部材の表面に積層された複数の層と、 を備えた酸素検出素子において、 上記積層された複数の層の各々は、上記多孔質電極に
対応する部位に開口部を備え、 該開口部に面する上記積層された複数の層の側端部
が、隣接して積層される各層の面方向に互いに所定距離
隔てられるとともに、該隣接して積層される各層間のず
れ幅が0.05mm以上であり、 更に、上記複数の層のうちの上記固体電解質体側の最
下層が、上記多孔質電極の一部を覆っていることを特徴
とする酸素検出素子にある。[Means for Solving the Problems] The gist of the present invention for solving the above problems is to provide a member made of an oxygen ion conductive solid electrolyte having a pair of porous electrodes on the front and back surfaces, A plurality of stacked layers, wherein each of the plurality of stacked layers has an opening at a portion corresponding to the porous electrode, and the stacked layer faces the opening. The side ends of the plurality of layers are separated from each other by a predetermined distance in the plane direction of each layer stacked adjacently, and a shift width between each layer stacked adjacently is 0.05 mm or more. The oxygen detecting element is characterized in that the lowermost layer on the solid electrolyte body side of the plurality of layers covers a part of the porous electrode.
このような複数の層を固体電解質体に積層した構成を
備える酸素検出素子としては次のようなものがある。The following are examples of an oxygen detection element having a configuration in which such a plurality of layers are stacked on a solid electrolyte body.
一端が閉じられ側面に連通孔を有する筒状碍管に、
表裏面に一対の電極パターンを印刷し、電極に対応する
開口部を有する絶縁層、保護層等を積層した固体電解質
板を捲回してなる筒状酸素検出素子。One end is closed and a cylindrical insulator tube with a communication hole on the side,
A tubular oxygen detection element formed by printing a pair of electrode patterns on the front and back surfaces and winding a solid electrolyte plate on which an insulating layer and a protective layer having openings corresponding to the electrodes are laminated.
表裏面に一対の電極パターンを印刷した固体電解質
板と基準ガス導入路形成体、電極に対応する開口部を有
する絶縁層、保護層等を積層してなる板状酸素検出素
子。A plate-shaped oxygen detecting element comprising a solid electrolyte plate on which a pair of electrode patterns are printed on the front and back surfaces, a reference gas introduction path forming body, an insulating layer having openings corresponding to the electrodes, a protective layer, and the like.
表裏面に一対の電極パターンを印刷した固体電解質
板の一方の面に電極に対応する開口部を有する絶縁層、
保護層等を積層し、他方の面に周囲雰囲気とガス拡散制
限部を介して連通する測定ガス室を各部材の積層により
形成し、測定ガス室内の酸素を素子外に排出あるいは素
子外から供給するよう構成された酸素検出素子。An insulating layer having an opening corresponding to the electrode on one surface of a solid electrolyte plate on which a pair of electrode patterns are printed on the front and back surfaces,
A protective layer, etc. are laminated, and a measurement gas chamber communicating with the surrounding atmosphere via a gas diffusion restricting section is formed on the other surface by laminating each member, and oxygen in the measurement gas chamber is discharged outside the element or supplied from outside the element. An oxygen detection element configured to
［作用］ 本発明の酸素検出素子は、多孔質電極に対応する開口
部において、複数の層を積層した積層体の端面が一致し
ておらず、各層間に0.05mm以上のずれがある。また、複
数の層のうちの固体電解質体側の最下層が、多孔質電極
の一部を覆っている。[Operation] In the oxygen detection element of the present invention, the end faces of the stacked body in which a plurality of layers are stacked do not coincide with each other in the opening corresponding to the porous electrode, and there is a deviation of 0.05 mm or more between the respective layers. Further, the lowermost layer on the solid electrolyte body side of the plurality of layers covers a part of the porous electrode.
そのため、製造工程の収縮時に発生する応力が各層間
の接合部全体で吸収され、上記積層端面の接合部に加わ
る応力が少なくなる。Therefore, the stress generated at the time of shrinkage in the manufacturing process is absorbed by the entire joint between the layers, and the stress applied to the joint at the laminated end face is reduced.
そのため、製造時における酸素検出素子の上記開口部
における積層端面におけるキレが少なくなる。Therefore, sharpness on the lamination end surface at the opening of the oxygen detection element during manufacture is reduced.
［実施例］ 本発明の一実施例を、第１図の断面図にしたがって説
明する。Embodiment An embodiment of the present invention will be described with reference to the cross-sectional view of FIG.
本実施例の酸素検出素子は、一端が閉じられ側面に連
通孔100を有する筒状碍管110に、表裏面に電極パターン
120,130を印刷し、電極130に対応する開口部140を有す
るアルミナの絶縁層150を積層したジルコニアの固体電
解質層160を捲回し、焼成することによって製造された
ものである。The oxygen detection element of this embodiment has a cylindrical insulator tube 110 having one end closed and a communication hole 100 on the side surface, and an electrode pattern on the front and back surfaces.
It is manufactured by printing 120 and 130, winding and firing a zirconia solid electrolyte layer 160 in which an alumina insulating layer 150 having an opening 140 corresponding to the electrode 130 is laminated.
そして、絶縁層150上には図示されない発熱体が印刷
によって形成されていると共に、この発熱体を保護する
アルミナの保護層170が積層されている。A heating element (not shown) is formed on the insulating layer 150 by printing, and an alumina protective layer 170 for protecting the heating element is laminated.
この保護層170には電極130に対応する開口部180が設
けられており、保護層170の開口部180の端部は、絶縁層
150の開口部140の端部より後退巾ｌだけ後退している。The protective layer 170 is provided with an opening 180 corresponding to the electrode 130, and an end of the opening 180 of the protective layer 170 is an insulating layer.
It is retracted from the end of the opening 140 by a retreat width l.
また、固体電解質層160,絶縁層150,保護層170の捲回
された端部190においても、各層の端面をずらしてい
る。In the wound end portions 190 of the solid electrolyte layer 160, the insulating layer 150, and the protective layer 170, the end faces of the respective layers are also shifted.
なお、焼成収縮率は絶縁層150,保護層170が最も大き
く、次いで固体電解質層160、筒状碍管110の順となる。
したがって、この酸素検出素子は焼成時に、碍管110に
対して大きな圧縮応力が生じると共に、絶縁層150と固
体電解質層160との接合面、および絶縁層150と保護層17
0との接合面に収縮差による大きな応力が加わる。The firing shrinkage ratio of the insulating layer 150 and the protective layer 170 is the largest, followed by the solid electrolyte layer 160 and the cylindrical insulator 110 in this order.
Therefore, in this oxygen detecting element, a large compressive stress is generated in the insulator tube 110 during firing, and the bonding surface between the insulating layer 150 and the solid electrolyte layer 160, and the insulating layer 150 and the protective layer 17
A large stress due to the difference in shrinkage is applied to the bonding surface with zero.
この酸素検出素子は、電極120は碍管110の内部及び連
通孔100を介して大気に晒されると共に、電極130が開口
部140を介して周囲雰囲気に晒される。この時の電極12
0,130間に生じる起電力によって周囲雰囲気中の酸素ガ
ス分圧を測定する。In this oxygen detecting element, the electrode 120 is exposed to the atmosphere through the inside of the insulator tube 110 and the communication hole 100, and the electrode 130 is exposed to the surrounding atmosphere through the opening 140. Electrode 12 at this time
The oxygen gas partial pressure in the surrounding atmosphere is measured by the electromotive force generated between 0 and 130.
上記酸素検出素子の開口部における後退巾ｌを変化さ
せて多数の素子を製造し、その時のキレ発生率を調べ
た。その結果を第２図に示す。なお、図中の後退巾ｌは
焼成前の値である。A number of devices were manufactured by changing the receding width 1 at the opening of the oxygen detecting device, and the cracking rate at that time was examined. The result is shown in FIG. The receding width 1 in the figure is a value before firing.
第２図から、明らかなように開口部における後退巾ｌ
が0.05mm以上であると、キレの発生は著しく減少する。It is apparent from FIG. 2 that the retreat width l at the opening is
Is 0.05 mm or more, the occurrence of sharpness is significantly reduced.
なお、本実施例では、固体電解質層160としてジルコ
ニアを使用したが、その他二酸化セリウム、二酸化トリ
ウム、二酸化ハフニウムの各固溶体、ペロブスカイト型
酸化物固溶体、３価金属酸化物固溶体等を使用した場合
にも同様の結果が得られる。In this example, zirconia was used as the solid electrolyte layer 160, but other solid solutions of cerium dioxide, thorium dioxide, hafnium dioxide, perovskite-type oxide solid solutions, trivalent metal oxide solid solutions, and the like were also used. Similar results are obtained.
また、絶縁層150,保護層170として、アルミナを使用
したが、他にスピネル等も使用した場合にも同様の結果
が得られる。In addition, although alumina was used for the insulating layer 150 and the protective layer 170, similar results can be obtained when other materials such as spinel are used.
さらに、本実施例では、固体電解質層160,絶縁層150,
保護層170の捲回された端部190においても、各層の端面
をずらしている。そのため、製造時にこの端部190にお
いても、上記開口部と同じく収縮によるキレの発生が抑
えられるという効果も有する。Further, in the present embodiment, the solid electrolyte layer 160, the insulating layer 150,
Also at the wound end 190 of the protective layer 170, the end faces of each layer are shifted. For this reason, at the end portion 190 at the time of manufacturing, there is also an effect that generation of sharpness due to shrinkage is suppressed as in the case of the opening.
なお、上記実施例では、外側の層の端部が内側の層の
端部より後退しているが、第３図のように、固体電解質
体200の表裏面に一対の電極210,220を形成し、固体電解
質体200に絶縁層230,保護層240を積層する場合、外側の
層である保護層240の開口部端部より内側の層である絶
縁層230の開口部端部が後退する構造の酸素検出素子と
することにより、上記の酸素検出素子と同様に製造時に
おけるキレの発生が減少する。In the above embodiment, the end of the outer layer is recessed from the end of the inner layer, but as shown in FIG. 3, a pair of electrodes 210 and 220 are formed on the front and back surfaces of the solid electrolyte body 200, When the insulating layer 230 and the protective layer 240 are stacked on the solid electrolyte body 200, the oxygen having a structure in which the opening end of the insulating layer 230, which is the inner layer, recedes from the opening end of the protective layer 240, which is the outer layer. The use of the detection element reduces the occurrence of sharpness during manufacturing as in the case of the above-described oxygen detection element.
［発明の効果］ 以上のように、本発明の酸素検出素子は積層体の隣接
する各層の端面が一致しておらず、0.05mm以上のずれが
ある。また、複数の層のうちの固体電解質体側の最下層
が、多孔質電極の一部を覆っている。[Effects of the Invention] As described above, in the oxygen detection element of the present invention, the end faces of adjacent layers of the stacked body do not coincide with each other, and there is a deviation of 0.05 mm or more. Further, the lowermost layer on the solid electrolyte body side of the plurality of layers covers a part of the porous electrode.
そのため、製造工程における各層の収縮時に発生する
応力が各層間の接合部全体で吸収され、電極に対応する
開口部の積層端面に加わる応力が少なくなる。Therefore, the stress generated when each layer contracts in the manufacturing process is absorbed by the entire joint between the layers, and the stress applied to the laminated end face of the opening corresponding to the electrode is reduced.
したがって、本発明の酸素検出素子は、製造時におけ
る不良が少なく、安定して製造することが可能となる。Therefore, the oxygen detection element of the present invention can be manufactured stably with few defects during manufacturing.
第１図は本発明の一実施例を説明する断面図、第２図は
その効果を説明する線図、第３図は他の実施例を説明す
る断面図である。 100……連通孔 110……筒状碍管 120,130,210,220……電極 140,180……開口部 150,230……絶縁層 160,200……固体電解質層 170,240……保護層FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention, FIG. 2 is a diagram illustrating the effect thereof, and FIG. 3 is a cross-sectional view illustrating another embodiment. 100 ... communicating hole 110 ... cylindrical insulator tube 120, 130, 210, 220 ... electrode 140, 180 ... opening 150, 230 ... insulating layer 160, 200 ... solid electrolyte layer 170, 240 ... protective layer
Claims (1)
オン伝導性の固体電解質体からなる部材と、 該部材の表面に積層された複数の層と、 を備えた酸素検出素子において、 上記積層された複数の層の各々は、上記多孔質電極に対
応する部位に開口部を備え、 該開口部に面する上記積層された複数の層の側端部が、
隣接して積層される各層の面方向に互いに所定距離隔て
られるとともに、該隣接して積層される各層間のずれ幅
が0.05mm以上であり、 更に、上記複数の層のうちの上記固体電解質体側の最下
層が、上記多孔質電極の一部を覆っていることを特徴と
する酸素検出素子。An oxygen detection element comprising: a member made of an oxygen ion conductive solid electrolyte having a pair of porous electrodes on the front and back surfaces; and a plurality of layers laminated on the surface of the member. Each of the plurality of stacked layers includes an opening at a portion corresponding to the porous electrode, and a side end of the stacked plurality of layers facing the opening is
The adjacent stacked layers are separated from each other by a predetermined distance in the plane direction, and a shift width between the adjacent stacked layers is 0.05 mm or more, and further, the solid electrolyte member side of the plurality of layers. Wherein the lowermost layer covers a part of the porous electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052321A JP2647894B2 (en) | 1988-03-04 | 1988-03-04 | Oxygen detection element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052321A JP2647894B2 (en) | 1988-03-04 | 1988-03-04 | Oxygen detection element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01224658A JPH01224658A (en) | 1989-09-07 |
| JP2647894B2 true JP2647894B2 (en) | 1997-08-27 |
Family
ID=12911528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63052321A Expired - Fee Related JP2647894B2 (en) | 1988-03-04 | 1988-03-04 | Oxygen detection element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2647894B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4646391B2 (en) * | 2000-12-07 | 2011-03-09 | 京セラ株式会社 | Gas sensor |
| JP6169989B2 (en) * | 2014-02-06 | 2017-07-26 | 日本特殊陶業株式会社 | Gas sensor element and gas sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55145353U (en) * | 1979-04-06 | 1980-10-18 | ||
| JPH0760143B2 (en) * | 1986-05-14 | 1995-06-28 | トヨタ自動車株式会社 | Oxygen concentration sensor |
-
1988
- 1988-03-04 JP JP63052321A patent/JP2647894B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01224658A (en) | 1989-09-07 |
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