JP7178420B2 - セラミックス構造体およびガスセンサのセンサ素子 - Google Patents
セラミックス構造体およびガスセンサのセンサ素子 Download PDFInfo
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- JP7178420B2 JP7178420B2 JP2020547825A JP2020547825A JP7178420B2 JP 7178420 B2 JP7178420 B2 JP 7178420B2 JP 2020547825 A JP2020547825 A JP 2020547825A JP 2020547825 A JP2020547825 A JP 2020547825A JP 7178420 B2 JP7178420 B2 JP 7178420B2
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Description
図1は、本発明の実施の形態に係る表面構造を具備するセラミックス構造体の一態様としての、センサ素子(ガスセンサ素子)10の概略的な外観斜視図である。なお、本実施の形態において、セラミックス構造体とは、内部や表面にセラミックス成分以外の構成要素を(例えば金属からなる電極や配線など)を有しつつも、セラミックスを主たる構成材料とする構造体を意味する。
センサ素子10においては、上述のような構成を有する素子基体1の一方端部E1側から所定範囲の最外周部に、先端保護層2が設けられてなる。先端保護層2は、100μm以上1000μm以下の厚みに設けられる。
次に、上述のような構成および特徴を有するセンサ素子10を製造するプロセスの一例について説明する。図5は、センサ素子10を作製する際の処理の流れを示す図である。
結着材(内側保護層)材料および微粒子材料(外側保護層):アルミナ、スピネル、チタニア、ジルコニア、マグネシア、ムライト、コージェライト等の高温の排ガス中で化学的に安定である酸化物粉末;
造孔材(内側保護層のみ):特に指定されないが、高分子系造孔材やカーボン系粉末等が使用できる。例えば、アクリル樹脂、メラミン樹脂、ポリエチレン粒子、ポリスチレン粒子、カーボンブラック粉末、黒鉛粉末等が使用可能;
バインダー(両層共通):特に限定されないが、焼成により得られる内側保護層21の強度向上という点からは、無機バインダーが好ましい。例えば、アルミナゾル、シリカゾル、チタニアゾル等が使用可能;
溶媒(両層共通):水、エタノール、IPA(イソプロピルアルコール)などの一般的な水系、非水系の溶媒が使用可能;
分散材(両層共通):特に限定されず、溶媒に適したものを適宜添加すればよく、例えば、ポリカルボン酸系(アンモニウム塩など)、リン酸エステル系、ナフタレンスルホン酸ホルマリン縮合系などが使用可能。
外側保護層形成用:10mPa・s~5000mPa・s;
内側保護層形成用:500mPa・s~7000mPa・s;
引き上げ速度:0.1mm/s~10mm/s;
乾燥温度:室温~300℃;
乾燥時間:1分以上。
焼成時間:0.5時間~10時間;
焼成雰囲気:大気。
上述の実施の形態においては、3つの内部空室を備えたセンサ素子を対象としているが、センサ素子が3室構造であることは必須ではない。すなわち、センサ素子の外側保護層を、ロータス効果により撥水する層とする態様は、内部空室が2つあるいは1つのセンサ素子にも適用可能である。
Claims (5)
- セラミックス構造体であって、
最外周部の少なくとも一部が、
粒子径が5.0μm~40μmである多数のセラミックス粗粒子の周囲に、粒子径が10nm以上1.0μm以下のセラミックス微粒子からなる大きさが1.0μm以下の多数の凸部が100nm~1000nmの平均間隔にて離散的に形成されてなり、
個々の前記セラミックス粗粒子が直接にまたは前記セラミックス微粒子を介して連接してなり、
気孔率が5%~50%である、
第1の多孔質層である、
ことを特徴とする、セラミックス構造体。 - 請求項1に記載のセラミックス構造体であって、
前記セラミックス粗粒子の前記セラミックス微粒子に対する重量比が3~35である、
ことを特徴とする、セラミックス構造体。 - 請求項1または請求項2に記載のセラミックス構造体であって、
前記第1の多孔質層の内側に、気孔率が20%~85%であってかつ前記第1の多孔質層よりも気孔率が大きい第2の多孔質層を有する、
ことを特徴とする、セラミックス構造体。 - 請求項1ないし請求項3のいずれかに記載のセラミックス構造体であって、
前記セラミックス粗粒子が、アルミナ、スピネル、チタニア、ジルコニア、マグネシア、ムライト、コージェライトからなる群から選ばれる一以上の酸化物の粒子であり、
前記セラミックス微粒子が、アルミナ、スピネル、チタニア、ジルコニア、マグネシア、ムライト、コージェライトからなる群から選ばれる一以上の酸化物の粒子である、
ことを特徴とする、セラミックス構造体。 - ガスセンサのセンサ素子であって、
測定対象ガス成分の検知部を備えたセラミックス構造体である素子基体と、
前記素子基体の最外周部の少なくとも一部に設けられた多孔質層である保護層と、
を備え、
前記保護層においては、
粒子径が5.0μm~40μmである多数のセラミックス粗粒子の周囲に、粒子径が10nm以上1.0μm以下のセラミックス微粒子からなる大きさが1.0μm以下の多数の凸部が100nm~1000nmの平均間隔にて離散的に形成されてなり、
個々の前記セラミックス粗粒子が直接にまたは前記セラミックス微粒子を介して連接してなり、
前記保護層の気孔率は5%~50%である、
ことを特徴とする、ガスセンサのセンサ素子。
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US20080241408A1 (en) | 2007-04-02 | 2008-10-02 | Scott Cumberland | Colloidal Particles for Lotus Effect |
JP2012173147A (ja) | 2011-02-22 | 2012-09-10 | Ngk Spark Plug Co Ltd | ガスセンサ素子、及びガスセンサ |
JP2012173146A (ja) | 2011-02-22 | 2012-09-10 | Ngk Spark Plug Co Ltd | ガスセンサ素子及びガスセンサ |
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US20080241408A1 (en) | 2007-04-02 | 2008-10-02 | Scott Cumberland | Colloidal Particles for Lotus Effect |
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JP2012173146A (ja) | 2011-02-22 | 2012-09-10 | Ngk Spark Plug Co Ltd | ガスセンサ素子及びガスセンサ |
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