JP2019209245A - 電気加熱式触媒装置 - Google Patents
電気加熱式触媒装置 Download PDFInfo
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Abstract
Description
前記担体の長手方向に沿って延在する基部と、前記基部から前記担体の周方向に沿って延在する複数の配線部とを備えた一対の櫛状電極と、前記担体の外周面に形成され、前記櫛状電極と前記担体との間に介在する下地層と、前記各配線部の一部を覆うように前記下地層と接合されることにより、前記各配線部を、前記下地層に固定する固定層と、を備えた電気加熱式触媒装置であって、前記長手方向に沿った前記担体の中心軸に対して直交する方向から、前記担体の外周面を視たときに、前記固定層は、矩形状であり、前記矩形状の固定層の対向する一対の第1の辺が、前記各配線部の両側において、前記配線部が延在する方向と平行になっており、前記一対の第1の辺の両端を繋ぐ一対の第2の辺は、前記配線部が延在する方向と、直交していることを特徴とする。
電気加熱式触媒装置1は、例えば自動車等の排気経路上に設けられ、エンジンから排出される排気ガスを浄化する装置である。図1Aに示すように、電気加熱式触媒装置1は、担体10、下地層4、櫛状電極5、および固定層6を備えている。
以下に図1に示す電気加熱式触媒装置1の製造方法を、図4A〜図4Eを参照して説明する。
本発明の実施例に係る電気加熱式触媒装置の配線部を固定する固定層の熱応力解析を実施した。実施例1では、図6Aに示すように、固定層6の中心Cから、配線部52の中心のずれ量Pを、0mm(ずれ量なし)、0.1mm、0.2mm、0.3mmとした解析モデルを作成した。
実施例1と同じようにして、固定層9の中心Cから、配線部52の中心のずれ量Pを、0mm(ずれ量なし)、0.1mm、0.2mm、0.3mmとした解析モデルを作成した。実施例1と相違する点は、図6Bに示すように、解析モデルの固定層9が、外形2mmの円形状である点である。
実施例1および比較例1の各解析モデルに対して、配線部52、担体10、第1下地層4a、第2下地層4b、および、固定層6に、上述した実施形態で例示した材料の物性値を付与し、150℃〜600℃に均一に温度を付与した時の、固定層6に作用する最大応力を熱応力解析(ダッソー・システムズ(株):ABAQUS)により算出した。この結果を、図7に示す。なお、図7に示す、縦軸の最大応力の比は、実施例1および比較例1の解析モデルのずれ量Pが0mmのときの最大応力を1としたときの比率である。
図4A〜図4Eに示す手順に従って、配線部が11本となる、図1に示すような電気加熱式触媒装置を作製した。まず、直径80mm、長さ65mmのSiC粒子とSi粒子を主材とした担体を準備し、この担体に金属触媒を担持させた。なお、単体のSiC粒子とSi粒子との合計量に対して、SiC粒子は、70体積%であり、Si粒子は、30体積%である。この担体の周面に、SiC粒子およびSi粒子を混合したペースト材を塗布し、これを焼成して第1下地層を成形した。なお、固定層のSiC粒子とSi粒子との合計量に対して、SiC粒子は、60体積%であり、Si粒子は、40体積%である。第1下地層は、第1下地層全体に対して、気孔率40体積%となり、厚さ0.23mmの多孔質層であった。次に、第1下地層の上に、Ni−50CrからなるNiCr粒子(32体積%)とベントナイト粒子(68体積%)を混合した溶射粉末を、プラズマ溶射により溶射し、多孔質の第2下地層を成形した(図4A参照)。第2下地層は、第2下地層全体に対して、気孔率が10体積%となり、厚さ0.1mmの多孔質層であった。
実施例2と同じようにして、電気加熱式触媒装置を作製した。実施例2との相違点は、固定層の成形時に、直径3mmの円形状の開口が形成されたマスキング材を用いて、直径3mmの固定層を形成した点である。
実施例2および比較例2で作製した電気加熱式触媒装置を、150℃〜900℃の冷熱環境下で担体の温度が変化するように、一対の櫛状電極間に繰り返し通電した試験を、2000サイクル行った。この試験中に、比較例2の電気加熱式触媒装置では、実施例2のものに比べて、電極間の通電性が低下していることが確認された。
Claims (3)
- 金属触媒が担持された担体と、
前記担体の長手方向に沿って延在する基部と、前記基部から前記担体の周方向に沿って延在する複数の配線部とを備えた一対の櫛状電極と、
前記担体の外周面に形成され、前記櫛状電極と前記担体との間に介在する下地層と、
前記各配線部の一部を覆うように前記下地層と接合されることにより、前記各配線部を、前記下地層に固定する固定層と、を備えた電気加熱式触媒装置であって、
前記長手方向に沿った前記担体の中心軸に対して直交する方向から、前記担体の外周面を視たときに、前記固定層は、矩形状であり、
前記矩形状の固定層の対向する一対の第1の辺が、前記各配線部の両側において、前記配線部が延在する方向と平行になっており、前記一対の第1の辺の両端を繋ぐ一対の第2の辺は、前記配線部が延在する方向と直交していることを特徴とする電気加熱式触媒装置。 - 前記第1の辺の端部と前記第2の辺の端部により形成された前記固定層の角部は、丸みを帯びていることを特徴とする請求項1に記載の電気加熱式触媒装置。
- 前記固定層に覆われた前記配線部の部分と、前記下地層との間には、隙間が形成されていることを特徴とする請求項1または2に記載の電気加熱式触媒装置。
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WO2021176926A1 (ja) * | 2020-03-05 | 2021-09-10 | 日本碍子株式会社 | 電気加熱式コンバータ及び電気加熱式担体 |
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DE102021111485A1 (de) | 2020-06-02 | 2021-12-02 | Toyota Jidosha Kabushiki Kaisha | Elektrisch beheizte katalysator-vorrichtung |
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CN110552761A (zh) | 2019-12-10 |
CN110552761B (zh) | 2021-06-15 |
KR20190137701A (ko) | 2019-12-11 |
US10570794B2 (en) | 2020-02-25 |
RU2711742C1 (ru) | 2020-01-21 |
US20190368403A1 (en) | 2019-12-05 |
JP7047604B2 (ja) | 2022-04-05 |
EP3574984A1 (en) | 2019-12-04 |
EP3574984B1 (en) | 2022-12-21 |
KR102180483B1 (ko) | 2020-11-18 |
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