JP7341155B2 - センサ素子およびセンサ素子を製造する方法 - Google Patents
センサ素子およびセンサ素子を製造する方法 Download PDFInfo
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- JP7341155B2 JP7341155B2 JP2020548481A JP2020548481A JP7341155B2 JP 7341155 B2 JP7341155 B2 JP 7341155B2 JP 2020548481 A JP2020548481 A JP 2020548481A JP 2020548481 A JP2020548481 A JP 2020548481A JP 7341155 B2 JP7341155 B2 JP 7341155B2
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- alumina
- zirconia
- sensor element
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 143
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Description
本発明は、センサ素子を製造する方法にも向けられている。本発明に係る上記センサ素子を製造する方法では、前記ジルコニア層部および前記2つのアルミナ層部が、共焼成により形成される。
(セラミック積層体の作製)
次に、セラミック積層体の実施例について述べる。ここでは、図4に示すように、ジルコニア層部83が4個の層831を含み、ジルコニア層部83の両面に2つのアルミナ層部84をそれぞれ形成したセラミック積層体8を作製した。
開気孔率の測定は、アルミナグリーンシートを焼成して得た、単体のアルミナ層部84に対して、アルキメデス法により行った。表2の「開気孔率」では、アルミナ層部84の開気孔率が0%以上4%未満であるセラミック積層体8に「〇」を付し、4%以上10%未満であるセラミック積層体8に「△」を付し、10%以上であるセラミック積層体8に「×」を付している。助剤としてSiO2およびY2O3をそれぞれ含む比較例2および5のセラミック積層体8では、アルミナ層部84の開気孔率が10%以上となる(緻密性が低下する)のに対し、実施例1~8、並びに、比較例1、3および4のセラミック積層体8では、開気孔率が10%未満となり、緻密なアルミナ層部84が得られた。
収縮開始温度の測定では、実施例1~8、並びに、比較例1~5におけるアルミナグリーンシートを単体で焼成する際の収縮開始温度を、熱機械分析装置(TMA)を用いて測定した。収縮開始温度は、グリーンシートの収縮率が2%以上となる際の温度とした。また、ジルコニアグリーンシートを単体で焼成する際の収縮開始温度も測定し、アルミナグリーンシートの収縮開始温度とジルコニアグリーンシートの収縮開始温度との差を求めた。表2の「収縮開始温度」では、アルミナグリーンシートの収縮開始温度とジルコニアグリーンシートの収縮開始温度との差の絶対値(以下、単に「収縮開始温度の差」という。)が30℃以下であるセラミック積層体8に「◎」を付し、30℃よりも大きく、かつ、50℃以下であるセラミック積層体8に「〇」を付し、50℃よりも大きく、かつ、70℃以下であるセラミック積層体8に「△」を付し、70℃よりも大きいセラミック積層体8に「×」を付している。実施例1~8では、収縮開始温度の差が50℃以下であるのに対し、比較例1~5では、収縮開始温度の差が50℃よりも大きくなった。比較例2、3および5では、収縮開始温度の差が70℃よりも大きくなり、セラミック積層体8において、アルミナ層部84とジルコニア層部83との剥離が生じた。したがって、比較例2、3および5については、表2における他の測定を行わなかった。
図5では、反りが生じたセラミック積層体8を二点鎖線で示している。反りの測定では、一方のアルミナ層部84を下側に配置した状態で、セラミック積層体8を水平な設置面上に載置し、3D形状測定機(キーエンス社製、VR-3000)を用いて、他方のアルミナ層部84の上方を向く面の全体をスキャンした。平均段差モードで設置面を基準面として設定し、アルミナ層部84の上記面において長手方向の80%以上の範囲、および、幅方向(短手方向)の30%以上の範囲の領域を測定面として設定した。そして、測定面の最大高さから最小高さを引いて得た値を、反りとして算出した。
反応層の確認では、セラミック積層体8の側面(積層方向に沿う面)を鏡面研磨した後、走査電子顕微鏡(SEM)装置で、研磨面におけるジルコニア層部83とアルミナ層部84との界面近傍を倍率1000倍で観察した。また、エネルギー分散形X線分光器(EDS)にて、ZrおよびTiの面分析を行い、ジルコニア層部83においてTi元素の存在する領域(Zr元素およびTi元素が混在する領域)を反応層として特定した。ZrおよびTiの分析には電子プローブマイクロアナライザー(EPMA)を用いることもできる。表1に示すように、実施例1~8のセラミック積層体8では、反応層の存在が確認できたのに対し、比較例1および4のセラミック積層体8では、反応層の存在が確認できなかった。したがって、反応層の存在が、反りの抑制に寄与していると考えられる。
曲げ強度の測定では、焼成後における大きさが(40mm×4mm)となるように焼成前の積層体を切断し、セラミック積層体8の作製と同様にして焼成を行って試験片を得た。そして、強度測定装置(インスロン社製)を用いて、各試験片に対して積層方向の4点曲げ強度を測定した。
耐被水性の測定では、セラミック積層体8をヒータ上に載置し、セラミック積層体8を800℃まで加熱した。セラミック積層体8の表面温度が800℃となると、所定量の水滴を滴下し、セラミック積層体8におけるクラックの発生の有無を目視で確認した。クラックが発生するまで、水滴の量を大きくしつつ上記作業を繰り返した。
3,83 ジルコニア層部
4,4a,4b,84 アルミナ層部
5 多孔質保護部
8 セラミック積層体
20 素子本体
39 反応層
371~377 電極
Claims (5)
- センサ素子であって、
ジルコニア層部、および、前記ジルコニア層部の両面にそれぞれ設けられた2つのアルミナ層部を有するセラミック積層体と、
前記セラミック積層体に設けられる複数の電極と、
を備え、
前記2つのアルミナ層部の双方が、Ti元素を含み、
前記ジルコニア層部が、前記2つのアルミナ層部のそれぞれとの界面において、ジルコニアの結晶構造にTi元素が固溶した反応層を有し、
前記反応層が、Ti元素を0.05~5.0質量%含むセンサ素子。 - 請求項1に記載のセンサ素子であって、
前記反応層の厚さが、5~100μmであるセンサ素子。 - 請求項1または2に記載のセンサ素子であって、
前記2つのアルミナ層部が、遷移金属、希土類、アルカリ金属およびアルカリ土類金属のいずれかに含まれる他の元素をさらに含むセンサ素子。 - 請求項1ないし3のいずれか1つに記載のセンサ素子であって、
前記セラミック積層体の一部を覆う多孔質保護部をさらに備えるセンサ素子。 - 請求項1ないし4のいずれか1つに記載のセンサ素子を製造する方法であって、
前記ジルコニア層部および前記2つのアルミナ層部が、共焼成により形成されるセンサ素子を製造する方法。
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PCT/JP2019/036196 WO2020066713A1 (ja) | 2018-09-28 | 2019-09-13 | センサ素子 |
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JP2006153703A (ja) | 2004-11-30 | 2006-06-15 | Ngk Spark Plug Co Ltd | ガスセンサ |
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JPH0778481B2 (ja) * | 1987-02-16 | 1995-08-23 | 日本碍子株式会社 | 酸素センサ素子の製造方法 |
US20020139670A1 (en) * | 2000-12-18 | 2002-10-03 | Beckmeyer Richard F. | Slip method for making exhaust sensors |
DE10345807A1 (de) * | 2003-09-30 | 2005-04-21 | Bosch Gmbh Robert | Festelektrolytmaterial und Verfahren zu dessen Herstellung |
US7265483B2 (en) * | 2004-03-29 | 2007-09-04 | Canon Kabushiki Kaisha | Dielectric member, piezoelectric member, ink jet head, ink jet recording apparatus and producing method for ink jet recording apparatus |
WO2007097460A1 (ja) * | 2006-02-27 | 2007-08-30 | Kyocera Corporation | セラミック部材の製造方法、並びにセラミック部材、ガスセンサ素子、燃料電池素子、フィルタ素子、積層型圧電素子、噴射装置、及び燃料噴射システム |
GB0704972D0 (en) * | 2007-03-15 | 2007-04-25 | Varney Mark S | Neoteric room temperature ionic liquid gas sensor |
WO2009119481A1 (ja) * | 2008-03-24 | 2009-10-01 | 京セラ株式会社 | 装飾部品用セラミックスおよびこれを用いた装飾部品 |
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WO2009128503A1 (ja) * | 2008-04-17 | 2009-10-22 | 旭硝子株式会社 | エレクトレットおよび静電誘導型変換素子 |
JP5736344B2 (ja) * | 2011-08-02 | 2015-06-17 | 日本特殊陶業株式会社 | ガスセンサ |
CN103681728B (zh) * | 2012-09-20 | 2018-04-24 | 索尼公司 | 固体摄像装置及其方法以及电子设备 |
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JP2002005875A (ja) | 2000-06-19 | 2002-01-09 | Denso Corp | 積層型ガスセンサ素子及びその製造方法 |
JP2005153449A (ja) | 2003-11-28 | 2005-06-16 | Kyocera Corp | セラミック成形体の接合方法およびガスセンサ素子の製造方法 |
JP2006153703A (ja) | 2004-11-30 | 2006-06-15 | Ngk Spark Plug Co Ltd | ガスセンサ |
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JP2013112595A (ja) | 2011-11-30 | 2013-06-10 | Nikkato:Kk | コーティング層を有するジルコニア製酸素センサー素子 |
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