JP4714867B2 - Oxygen sensor - Google Patents
Oxygen sensor Download PDFInfo
- Publication number
- JP4714867B2 JP4714867B2 JP2005273273A JP2005273273A JP4714867B2 JP 4714867 B2 JP4714867 B2 JP 4714867B2 JP 2005273273 A JP2005273273 A JP 2005273273A JP 2005273273 A JP2005273273 A JP 2005273273A JP 4714867 B2 JP4714867 B2 JP 4714867B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- oxygen sensor
- bacuo
- mixed
- ammeter
- 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.)
- Active
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Description
本発明は、例えば内燃機関の排気ガスなど、被測定ガス中の酸素濃度を検出するための酸素センサに関するものである。 The present invention relates to an oxygen sensor for detecting an oxygen concentration in a gas to be measured such as an exhaust gas of an internal combustion engine.
従来、例えば内燃機関の排気ガスなど、被測定ガス中の酸素濃度を検出するための酸素センサに関するものとして、特開２００４−２２６３１０号公報や特開平８−７５６９７号公報などに記載された酸素センサが知られている。
しかしながら、従来の酸素センサは、構造が複雑であり多くの製造工程を必要としているため、小型化、軽量化が困難であると共にコストが高く消費電力も高いものとなっている。 However, since the conventional oxygen sensor has a complicated structure and requires many manufacturing processes, it is difficult to reduce the size and weight, and the cost is high and the power consumption is high.
解決しようとする課題は、構造を簡素化して、小型化、軽量化を図り、低コスト化、低消費電力化を可能にすると共に信頼性の高い酸素センサを提供することである。 The problem to be solved is to provide a highly reliable oxygen sensor that simplifies the structure, achieves miniaturization and weight reduction, enables cost reduction and power consumption reduction.
本発明は、前記課題を解決するために、線材の両端に電源を設け、前記線材に流れる電流を測定する電流計を設けた酸素センサであって、前記線材に同一の希土類元素Ｌｎを含むＬｎＢａ２Ｃｕ３O７−δとＬｎ２ＢａＣｕＯ５とを混合した複合セラミックスの線材を用いたことを特徴とするものである。 In order to solve the above-mentioned problem, the present invention provides an oxygen sensor provided with a power source at both ends of a wire, and provided with an ammeter for measuring a current flowing in the wire, wherein the wire contains the same rare earth element Ln. It is characterized by using a composite ceramic wire in which 2 Cu 3 O 7-δ and Ln 2 BaCuO 5 are mixed.
また、線材の両端に電源を設け、前記線材に流れる電流を測定する電流計を設けた酸素センサであって、前記線材にＧｄＢａ２Ｃｕ３Ｏ７−δとＧｄ２ＢａＣｕＯ５とを混合した複合セラミックスの線材を用いたことを特徴とするものである。 Further, the oxygen sensor is provided with a power source at both ends of the wire and an ammeter for measuring a current flowing through the wire, and is a composite in which the wire is mixed with GdBa 2 Cu 3 O 7-δ and Gd 2 BaCuO 5 It is characterized by using a ceramic wire .
本発明の酸素センサは、線材の両端に電源を設け、前記線材に流れる電流を測定する電流計を設けた酸素センサであって、前記線材に同一の希土類元素Ｌｎを含むＬｎＢａ２Ｃｕ３Ｏ７−δとＬｎ２ＢａＣｕＯ５とを混合した複合セラミックスの線材を用いたことで、構造を簡素化して、小型化、軽量化を図り、低コスト化、低消費電力化を可能にすると共に信頼性の高い酸素センサを提供することができる。 The oxygen sensor according to the present invention is an oxygen sensor in which a power source is provided at both ends of a wire, and an ammeter for measuring a current flowing through the wire is provided. The wire includes LnBa 2 Cu 3 O containing the same rare earth element Ln. By using a composite ceramic wire mixed with 7-δ and Ln 2 BaCuO 5 , the structure is simplified, the size and weight are reduced, the cost is reduced, and the power consumption is reduced. A highly functional oxygen sensor can be provided.
本発明の酸素センサは、線材の両端に電源を設け、前記線材に流れる電流を測定する電流計を設けた酸素センサであって、前記線材にＧｄＢａ２Ｃｕ３Ｏ７−δとＧｄ２ＢａＣｕＯ５とを混合した複合セラミックスの線材を用いたものである。このように構成することにより、構造を簡素化して、小型化、軽量化を図り、低コスト化、低消費電力化を可能にすると共に信頼性の高い酸素センサを提供することができる。 The oxygen sensor according to the present invention is an oxygen sensor in which a power source is provided at both ends of a wire, and an ammeter that measures a current flowing through the wire is provided. The wire includes GdBa 2 Cu 3 O 7-δ and Gd 2 BaCuO 5. And a composite ceramic wire mixed with the above. With such a configuration, the structure can be simplified, the size and weight can be reduced, the cost and the power consumption can be reduced, and a highly reliable oxygen sensor can be provided.
本発明の一実施例について、以下に説明する。ある値以上の電圧をＬｎＢａ２Ｃｕ３Ｏ７−δ（Ｌｎ＝希土類元素、δは０〜１）のセラミックス線材に印加すると、線材の一部分が赤熱する。本発明者は、この現象をホットスポット現象と名付け（参考文献：T.Okamoto et al.,Jpn.J.Appl.Phys.,33,L1212(1994)）、本現象に起因する様々な機能物性の発現機構の解明および酸素センサをはじめとする様々なデバイスへの応用について研究を行ってきた（参考文献：M.Takata et al.,Bull.Mater.Sci.,22,593(1999)）。 One embodiment of the present invention will be described below. When a voltage of a certain value or more is applied to a ceramic wire rod of LnBa 2 Cu 3 O 7-δ (Ln = rare earth element, δ is 0 to 1), a part of the wire rod is heated red. The present inventor named this phenomenon a hot spot phenomenon (reference: T. Okamoto et al., Jpn. J. Appl. Phys., 33, L1212 (1994)) and various functional physical properties resulting from this phenomenon. Research has been conducted on the elucidation of the expression mechanism and the application to various devices including oxygen sensors (reference: M. Takata et al., Bull. Mater. Sci., 22, 593 (1999)).
ホットスポットの温度は雰囲気の酸素分圧の増加に伴って上昇するため、高酸素分圧下ではホットスポット部分で線材が溶断し易くなるという耐久性の問題があった。この問題に対して、高融点材料であるＢａＡｌ２Ｏ４やＢａＺｒＯ３を用いてＧｄ−１２３（ＧｄＢａ２Ｃｕ３Ｏ７−δ）を複合化させることにより、線材の溶断が抑制されることがわかってきた（参考文献： T.Okamoto and M.Takata,Key Engineering Materials,228-229,307(2002)、Y.Tsutai et al.,J.Ceram.Soc.Japan,112,S599(2004)）。 Since the temperature of the hot spot increases with an increase in the oxygen partial pressure of the atmosphere, there has been a problem of durability that the wire is easily melted at the hot spot portion under a high oxygen partial pressure. In order to solve this problem, the fusing of the wire can be suppressed by combining Gd-123 (GdBa 2 Cu 3 O 7-δ ) using BaAl 2 O 4 or BaZrO 3 which are high melting point materials. (Reference: T. Okamoto and M. Takata, Key Engineering Materials, 228-229, 307 (2002), Y. Tsutai et al., J. Ceram. Soc. Japan, 112, S599 (2004)).
線材の溶断は、ホットスポット内部の局所部分、特に粒界部分において液相が生じることに起因すると考えられる。相図（参考文献：M.Murakami et al.,Jpn.J.Appl.Phys.,28,L399-401(1989)）から推測すると、液相の生成を抑えるには、Ｌｎ−１２３（ＬｎＢａ２Ｃｕ３Ｏ７−δ）とＬｎ−２１１（Ｌｎ２ＢａＣｕＯ５）の混合相が有効である。そこで本発明では、Ｌｎ−１２３とＬｎ−２１１とを用いた複合線材を作製し、その電気特性および耐久性を、これまでに検討した複合線材の結果と比較した。 It is considered that the melting of the wire is caused by the occurrence of a liquid phase in a local portion inside the hot spot, particularly a grain boundary portion. Presuming from the phase diagram (reference: M. Murakami et al., Jpn. J. Appl. Phys., 28, L399-401 (1989)), to suppress the formation of the liquid phase, Ln-123 (LnBa 2 A mixed phase of Cu 3 O 7-δ ) and Ln-211 (Ln 2 BaCuO 5 ) is effective. Therefore, in the present invention, a composite wire using Ln-123 and Ln-211 was produced, and its electrical characteristics and durability were compared with the results of the composite wires studied so far.
実験では、ＬｎとしてＧｄを用いたＧｄ−１２３基複合線材を固相反応により焼成温度９００〜１０００℃で作製した。ＸＲＤパターンから、得られた試料はＧｄ−１２３とＧｄ−２１１のみから成る複合セラミックスであることを確認した。このセラミックスから断面が０．６５ｍｍ×０．６５ｍｍの線材を切り出し、四端子法により電気特性を評価した。 In the experiment, a Gd-123 group composite wire using Gd as Ln was produced at a firing temperature of 900 to 1000 ° C. by solid phase reaction. From the XRD pattern, it was confirmed that the obtained sample was a composite ceramic composed only of Gd-123 and Gd-211. A wire having a cross section of 0.65 mm × 0.65 mm was cut out from the ceramic, and the electrical characteristics were evaluated by a four-terminal method.
図２にＧｄ−２１１を１０ｍｏｌ％混合した複合線材の電流−電圧特性を示す。比較のために図中には、Ｇｄ−１２３単相線材とこれまでに検討した複合線材の特性も示している（高融点材料の混合量は何れも１０ｍｏｌ％である）。矢印は、線材の溶断を示している。単相線材と比べて、何れの複合線材においても溶断する電力（耐電力）は大きくなった。その中でも、Ｇｄ−２１１を用いた複合線材は、最も耐電力が大きいことがわかった。以上の結果から、Ｇｄ−２１１を用いたＧｄ−１２３の複合化は、ホットスポットを利用したデバイスの耐久性の向上に極めて有効であることがわかった。 FIG. 2 shows current-voltage characteristics of a composite wire mixed with 10 mol% of Gd-211. For comparison, the figure also shows the characteristics of the Gd-123 single-phase wire and the composite wire studied so far (the mixing amount of the high melting point material is 10 mol%). The arrow has shown melting | fusing of the wire. Compared with the single-phase wire, the power (power resistance) to be melted in any composite wire was increased. Among them, the composite wire using Gd-211 was found to have the highest power resistance. From the above results, it was found that the combination of Gd-123 using Gd-211 is extremely effective for improving the durability of a device using a hot spot.
次に、本発明の酸素センサの基本構成について、図１に基づき説明する。線材１の両端に導線４を介して電源２を接続し、線材１に流れる電流を測定するために線材１と電源２の間に電流計３を導線４を介して接続する。線材１には、ＧｄＢａ２Ｃｕ３Ｏ７−δとＧｄ２ＢａＣｕＯ５とを混合した複合セラミックスの線材を用いた。ＧｄＢａ２Ｃｕ３Ｏ７−δとＧｄ２ＢａＣｕＯ５とを混合した複合セラミックスの線材は、ＬｎＢａ２Ｃｕ３Ｏ７−δとＬｎ２ＢａＣｕＯ５とを混合した複合セラミックスの線材の一例である。
Next, the basic configuration of the oxygen sensor of the present invention will be described with reference to FIG. A
次に、本発明の酸素センサを用いて、例えば、内燃機関の排気ガスなど、被測定ガス中の酸素濃度を検出する場合には、図１に示したように、酸素センサの線材１を管体５内に設け、管体５内には被測定ガス６を流入させ、その時の電流計３の計測値により被測定ガス中の酸素濃度を検出する。
Next, when the oxygen sensor of the present invention is used to detect the oxygen concentration in the gas to be measured, such as the exhaust gas of an internal combustion engine, for example, as shown in FIG. The gas to be measured 6 is allowed to flow into the
以上のように、本発明の酸素センサは、室温作動全固体センサであり、この酸素センサを用いることにより、酸素センサの素子自体の構造を極めて簡素に構成することができ、システム全体の構成も簡便とすることができる。従って、小型化、軽量化を図り、低コスト化、低消費電力化を可能にすると共に信頼性の高い酸素センサを提供することができる。 As described above, the oxygen sensor of the present invention is a room temperature operation all-solid sensor. By using this oxygen sensor, the structure of the element of the oxygen sensor itself can be configured extremely simply, and the configuration of the entire system is also achieved. It can be simple. Therefore, it is possible to reduce the size and weight, to reduce the cost and to reduce the power consumption, and to provide a highly reliable oxygen sensor.
１ 線材
２ 電源
３ 電流計
1
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005273273A JP4714867B2 (en) | 2005-09-21 | 2005-09-21 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005273273A JP4714867B2 (en) | 2005-09-21 | 2005-09-21 | Oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007085816A JP2007085816A (en) | 2007-04-05 |
| JP4714867B2 true JP4714867B2 (en) | 2011-06-29 |
Family
ID=37972943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005273273A Active JP4714867B2 (en) | 2005-09-21 | 2005-09-21 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4714867B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019182010A1 (en) | 2018-03-23 | 2019-09-26 | Koa株式会社 | Gas sensor and method for manufacturing same |
| WO2019182011A1 (en) | 2018-03-23 | 2019-09-26 | Koa株式会社 | Gas sensor and manufacturing method therefor |
| JP2020106336A (en) * | 2018-12-26 | 2020-07-09 | Koa株式会社 | Atmospheric pressure sensor, atmospheric pressure measurement method, and atmospheric pressure measurement device |
| TWI789488B (en) * | 2018-01-31 | 2023-01-11 | 日商興亞股份有限公司 | Oxygen sensing element |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5149025B2 (en) * | 2008-01-31 | 2013-02-20 | テルモ株式会社 | Oxygen concentrator |
| JP6732579B2 (en) * | 2016-07-20 | 2020-07-29 | Koa株式会社 | Oxygen sensor |
| JP7290215B2 (en) * | 2018-01-31 | 2023-06-13 | Koa株式会社 | oxygen sensor element |
| JP7085714B2 (en) * | 2018-01-31 | 2022-06-17 | Koa株式会社 | Oxygen sensor element |
| JP7165035B2 (en) * | 2018-11-29 | 2022-11-02 | Koa株式会社 | Gas sensor and its manufacturing method |
| JP2023000410A (en) * | 2021-06-17 | 2023-01-04 | 国立大学法人長岡技術科学大学 | Oxygen sensor element and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02204322A (en) * | 1989-01-31 | 1990-08-14 | Asahi Glass Co Ltd | Oxide superconductor having novel structure |
| JP2004104840A (en) * | 2002-09-04 | 2004-04-02 | Nippon Steel Corp | High withstand voltage superconductive current limiter |
-
2005
- 2005-09-21 JP JP2005273273A patent/JP4714867B2/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02204322A (en) * | 1989-01-31 | 1990-08-14 | Asahi Glass Co Ltd | Oxide superconductor having novel structure |
| JP2004104840A (en) * | 2002-09-04 | 2004-04-02 | Nippon Steel Corp | High withstand voltage superconductive current limiter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI789488B (en) * | 2018-01-31 | 2023-01-11 | 日商興亞股份有限公司 | Oxygen sensing element |
| WO2019182010A1 (en) | 2018-03-23 | 2019-09-26 | Koa株式会社 | Gas sensor and method for manufacturing same |
| WO2019182011A1 (en) | 2018-03-23 | 2019-09-26 | Koa株式会社 | Gas sensor and manufacturing method therefor |
| JP2020106336A (en) * | 2018-12-26 | 2020-07-09 | Koa株式会社 | Atmospheric pressure sensor, atmospheric pressure measurement method, and atmospheric pressure measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007085816A (en) | 2007-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4714867B2 (en) | Oxygen sensor | |
| JP5642845B2 (en) | Hydrogen sensitive composite material, hydrogen gas sensor, and sensor for detecting hydrogen and other gases with improved reference resistance | |
| CN104122448B (en) | High-temperature test fixture | |
| JP6523878B2 (en) | Gas sensor controller | |
| JPH07501152A (en) | Polarographic sensor | |
| Badwal | Effect of alumina and monoclinic zirconia on the electrical conductivity of Sc 2 O 3-ZrO 2 compositions | |
| JP6725142B2 (en) | Sensor probe and method of using the same | |
| JPH07201526A (en) | Porcelain composition for thermistor | |
| JP2001174434A (en) | Gas sensor | |
| Subbarao | Oxygen sensors | |
| US20180231495A1 (en) | Sensor element for detecting at least one property of a measuring gas in a measuring gas chamber including a glass ceramic seal | |
| KR102138987B1 (en) | Gas sensor for measuring different gases, and corresponding production method | |
| Zhuiykov | Development of dual sulfur oxides and oxygen solid state sensor for “in situ” measurements | |
| EP0826961A1 (en) | Self-heating oxygen sensor | |
| JP6784486B2 (en) | Hydrogen sensor and its manufacturing method | |
| JP2004085549A (en) | Resistance oxygen sensor, oxygen sensor unit employing it and air-fuel ratio control system | |
| JP2007035346A (en) | Conductive material made of terbium-bismuth-tungsten oxide solid solution, and manufacturing method of the same | |
| JP2000055857A (en) | Oxygen sensor element | |
| MX2007005853A (en) | Ceramic insulating material and sensor element containing this material. | |
| JPH02298851A (en) | Terminal structure of detection element | |
| Sakurai et al. | Oxidization characteristics of some standard platinum resistance thermometers | |
| Ying et al. | Investigation on pumping oxygen characteristics of (Bi2O3) 0.73 (Y2O3) 0.27 solid electrolyte | |
| US20220011259A1 (en) | Solid electrolyte and gas sensor | |
| JPS58201057A (en) | Sensing element of gas | |
| JP2008286569A (en) | Sensor element, and gas sensor equipped with the sensor element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20080609 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20101020 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20101213 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20110203 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20110228 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |