JP6548528B2 - 目封止ハニカム構造体、及び目封止ハニカムセグメント - Google Patents
目封止ハニカム構造体、及び目封止ハニカムセグメント Download PDFInfo
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- JP6548528B2 JP6548528B2 JP2015172705A JP2015172705A JP6548528B2 JP 6548528 B2 JP6548528 B2 JP 6548528B2 JP 2015172705 A JP2015172705 A JP 2015172705A JP 2015172705 A JP2015172705 A JP 2015172705A JP 6548528 B2 JP6548528 B2 JP 6548528B2
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- cells
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- honeycomb segment
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- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- F01N3/28—Construction of catalytic reactors
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Description
前記ハニカムセグメントの前記流入端面における所定のセルの開口部、及び前記流出端面における残余のセルの開口部に配設された目封止部と、を備え、
前記ハニカムセグメントには、前記セルの延びる方向に直交する断面において、少なくとも2種類以上の異なる形状の前記セルが形成されており、
前記ハニカムセグメントは、前記セルの延びる方向に直交する断面の中央を含む中央領域と、当該中央領域の外周側に位置する外周領域と、を有し、
前記中央領域は、前記流入端面における前記セルの開口部に前記目封止部が配設された流出セルの周りを、前記流出端面における前記セルの開口部に前記目封止部が配設された流入セルが取り囲むように配列されたセル配列パターンからなる領域であり、
前記ハニカムセグメントの前記流入端面において、前記外周領域における開口率が、前記中央領域における開口率よりも小さくなるように構成され、
前記ハニカムセグメントの前記セグメント外周壁の厚さが、0.3〜1.0mmであり、前記ハニカムセグメントの前記断面の前記セル配列パターンにおいて、前記流出セルの形状が四角形であり、前記流入セルの形状が五角形又は六角形のいずれか一方であり、四角形の前記流出セルの周りを、8つの五角形の前記流入セル又は4つの六角形の前記流入セルが取り囲むように構成されている、目封止ハニカムセグメント。
図1〜図5に示すように、本発明の目封止ハニカム構造体の第一実施形態は、複数個のハニカムセグメント4と、接合層6と、目封止部5と、を備えた、目封止ハニカム構造体100である。すなわち、本実施形態の目封止ハニカム構造体100は、所謂、セグメント構造の目封止ハニカム構造体である。目封止ハニカム構造体100の外周には、複数個のハニカムセグメント4を囲繞するように配設された外壁8を更に備えている。
図1〜図5に示す本実施形態の目封止ハニカム構造体の製造方法については、特に制限はなく、例えば、以下のような方法により製造することができる。まず、ハニカムセグメントを作製するための可塑性の坏土を調製する。ハニカムセグメントを作製するための坏土は、原料粉末として、前述のハニカムセグメントの好適な材料の中から選ばれた材料に、適宜、バインダ等の添加剤、及び水を添加することによって調製することができる。原料粉末としては、例えば、炭化珪素粉末を使用することができる。バインダとしては、例えば、メチルセルロースや、ヒドロキシプロポキシルメチルセルロース等を挙げることができる。また、添加剤としては、界面活性剤等を挙げることができる。
次に、本発明の目封止ハニカムセグメントの第一実施形態について説明する。本実施形態の目封止ハニカムセグメントは、これまでに説明した第一実施形態の目封止ハニカム構造体に用いられる目封止ハニカムセグメントである。
セラミックス原料として、炭化珪素(SiC)粉末と金属珪素(Si)粉末とを80:20の質量割合で混合した混合原料を準備した。この混合原料に、バインダとしてヒドロキシプロピルメチルセルロース、造孔材として吸水性樹脂を添加するとともに、水を添加して成形原料を作製した。得られた成形原料を、ニーダーを用いて混練し、坏土を得た。
デザイン、セグメントサイズ、隔壁の厚さ、距離P、距離Q、流入端面における中央領域の開口率、流入端面における外周領域の開口率、接合幅、及びセグメント外周壁厚さを、表1のように変更して、実施例2〜11、参考例12〜14の目封止ハニカム構造体を作製した。目封止ハニカムセグメントを作製するセラミックス原料については、実施例1と同様に調製されたセラミックス原料を用いた。
デザイン、セグメントサイズ、隔壁の厚さ、距離P、距離Q、流入端面における中央領域の開口率、流入端面における外周領域の開口率、接合幅、及びセグメント外周壁厚さを、表1のように変更して、比較例1〜11の目封止ハニカム構造体を作製した。目封止ハニカムセグメントを作製するセラミックス原料については、実施例1と同様に調製されたセラミックス原料を用いた。
実施例1〜11、参考例12〜14及び比較例1〜11の目封止ハニカム構造体を、排気量2.0Lのディーゼルエンジンの排気系に搭載し、このフィルタにススを堆積させた。次いで、排ガス温度を3℃/秒で650℃まで上昇させた。その後、アイドリング運転に条件を変更してガス流量を急激に減らした。このような条件でフィルタの再生を行なった。フィルタ内のススの堆積割合を次第に増加させてこの試験(フィルタの再生)を繰り返し行った。そして、フィルタにクラックが発生しない最大のススの堆積割合を調査した。このときのススの堆積割合を「クラック限界」とする。
評価A:比較例1を基準とし、比較例1比で+1.5g/L以上である。
評価B:比較例1を基準とし、比較例1比で+1.0g/L以上である。
評価C:比較例1を基準とし、比較例1比で+0.5g/L以上である。
評価D:比較例1を基準とし、比較例1比で+0.5g/L未満である。
まず、比較例1の目封止ハニカム構造体を、排気量2.0Lの乗用車用ディーゼルエンジンを搭載した乗用車の排気系に装着した。この乗用車を使用し、シャシダイナモによる車両試験として、フルロードステップアップ時の圧力損失を測定した。具体的には、エンジン回転数を5000rpmまで、3分/ステップで1000rpmずつ上昇させ、各ステップでの圧力損失を測定した。比較例1の目封止ハニカム構造体の圧力損失を、圧力損失評価の基準値とした。次に、比較例1と同様の方法で、実施例1〜11、参考例12〜14及び比較例2〜11の目封止ハニカム構造体の圧力損失を測定した。各実施例、参考例及び比較例の圧力損失の値と、基準値である比較例1の圧力損失の値を比較し、以下の評価基準により、圧力損失評価を行った。なお、評価にあたっては、エンジン回転数5000rpm時の圧力損失を用いた。
評価A:比較例1を基準とし、比較例1比で−5%以下である。
評価B:比較例1を基準とし、比較例1比で+5%以下である。
評価C:比較例1を基準とし、比較例1比で+15%以下である。
評価D:比較例1を基準とし、比較例1比で+15%を超えるである。
実施例1〜11、参考例12〜14の目封止ハニカム構造体は、PM堆積限界の評価結果が、C以上であった。一方で、比較例1,2,11の目封止ハニカム構造体は、PM堆積限界の評価結果が、いずれもDであった。このため、ハニカムセグメントの流入端面において、外周領域における開口率が、中央領域における開口率よりも小さくなるように構成された実施例1〜11、参考例12〜14の目封止ハニカム構造体は、PM堆積限界が向上されたものであることが確認された。また、接合層の厚さが1.6mmの比較例3,7は、圧力損失の評価結果がDであった。また、接合層の厚さが0.4mmの比較例4,8は、PM堆積限界の評価結果がDであった。また、セグメント外周壁の厚さが1.1mmの比較例5,9は、PM堆積限界及び圧力損失の評価結果が、いずれもDであった。また、セグメント外周壁の厚さが0.2mmの比較例6,10は、PM堆積限界の評価結果がDであった。以上の結果より、接合層の厚さ及びセグメント外周壁の厚さについても、PM堆積限界及び圧力損失に与える影響が大きく、セグメント外周壁の厚さを0.3〜1.0mmとし、接合層の厚さを0.5〜1.5mmとすることで、PM堆積限界を向上させつつ、圧力損失を低減することが可能である。
Claims (4)
- 流体が流入する流入端面から流体が流出する流出端面まで延びる複数のセルを区画形成する多孔質の隔壁、及び最外周に配設されたセグメント外周壁を有する、複数個の角柱状のハニカムセグメントと、
複数個の前記ハニカムセグメントの側面同士を互いに接合する接合層と、
それぞれの前記ハニカムセグメントの前記流入端面における所定のセルの開口部、及び前記流出端面における残余のセルの開口部に配設された目封止部と、を備え、
前記ハニカムセグメントには、前記セルの延びる方向に直交する断面において、少なくとも2種類以上の異なる形状の前記セルが形成されており、
前記ハニカムセグメントは、前記セルの延びる方向に直交する断面の中央を含む中央領域と、当該中央領域の外周側に位置する外周領域と、を有し、
前記中央領域は、前記流入端面における前記セルの開口部に前記目封止部が配設された流出セルの周りを、前記流出端面における前記セルの開口部に前記目封止部が配設された流入セルが取り囲むように配列されたセル配列パターンからなる領域であり、
少なくとも1つの前記ハニカムセグメントの前記流入端面において、前記外周領域における開口率が、前記中央領域における開口率よりも小さくなるように構成され、
前記ハニカムセグメントの前記セグメント外周壁の厚さが、0.3〜1.0mmであり、
前記接合層の厚さが、0.5〜1.5mmであり、
前記ハニカムセグメントの前記断面の前記セル配列パターンにおいて、前記流出セルの形状が四角形であり、前記流入セルの形状が五角形又は六角形のいずれか一方であり、四角形の前記流出セルの周りを、8つの五角形の前記流入セル又は4つの六角形の前記流入セルが取り囲むように構成されている、目封止ハニカム構造体。 - 前記中央領域を、前記ハニカムセグメントの前記断面における前記セル配列パターンからなる最大の領域とし、前記中央領域における開口率の値から、前記外周領域における開口率の値を減算した値が、10%以上である、請求項1に記載の目封止ハニカム構造体。
- 流体が流入する流入端面から流体が流出する流出端面まで延びる複数のセルを区画形成する多孔質の隔壁、及び最外周に配設されたセグメント外周壁を有する、角柱状のハニカムセグメントと、
前記ハニカムセグメントの前記流入端面における所定のセルの開口部、及び前記流出端面における残余のセルの開口部に配設された目封止部と、を備え、
前記ハニカムセグメントには、前記セルの延びる方向に直交する断面において、少なくとも2種類以上の異なる形状の前記セルが形成されており、
前記ハニカムセグメントは、前記セルの延びる方向に直交する断面の中央を含む中央領域と、当該中央領域の外周側に位置する外周領域と、を有し、
前記中央領域は、前記流入端面における前記セルの開口部に前記目封止部が配設された流出セルの周りを、前記流出端面における前記セルの開口部に前記目封止部が配設された流入セルが取り囲むように配列されたセル配列パターンからなる領域であり、
前記ハニカムセグメントの前記流入端面において、前記外周領域における開口率が、前記中央領域における開口率よりも小さくなるように構成され、
前記ハニカムセグメントの前記セグメント外周壁の厚さが、0.3〜1.0mmであり、
前記ハニカムセグメントの前記断面の前記セル配列パターンにおいて、前記流出セルの形状が四角形であり、前記流入セルの形状が五角形又は六角形のいずれか一方であり、四角形の前記流出セルの周りを、8つの五角形の前記流入セル又は4つの六角形の前記流入セルが取り囲むように構成されている、目封止ハニカムセグメント。 - 前記中央領域を、前記ハニカムセグメントの前記断面における前記セル配列パターンからなる最大の領域とし、前記中央領域における開口率の値から、前記外周領域における開口率の値を減算した値が、10%以上である、請求項3に記載の目封止ハニカムセグメント。
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