JP2017176911A - ハニカム構造体、及びハニカム構造体の製造方法 - Google Patents
ハニカム構造体、及びハニカム構造体の製造方法 Download PDFInfo
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
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- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
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- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- SBEQWOXEGHQIMW-UHFFFAOYSA-N silicon Chemical compound [Si].[Si] SBEQWOXEGHQIMW-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical class [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本実施形態のハニカム構造体1は、図1に示すように、ディーゼルエンジン等の内燃機関から排出される排気ガスEG(本発明における流体に相当)の排気流路CRの途中に設けられた排気ガス浄化装置2の一部として用いられる。
更に、本実施形態のハニカム構造体1について詳述すると、軸方向X(図1参照)に対して垂直な構造体端面8を備え、当該構造体端面8が互いに異なる二つのセル構造(第一セル構造9a及び第二セル構造9b)で形成され、それぞれが外周部14によって囲まれた二つのセル領域(第一セル領域10a及び第二セル領域10b)を組合わせたものから構築されている。
本発明のハニカム構造体は、成形材料としての坏土を押出成形機を用いて押し出し、乾燥及び焼成等の周知の工程を経て製造することができる。押出成形等の各工程は周知であるため、ここでは詳細な説明は省略する。更に、ハニカム構造体の材質は、特に限定されるものではなく、多孔質のセラミックス材料を使用することができる。例えば、コージェライト、アルミナ、ムライト、窒化珪素、炭化珪素、チタン酸アルミニウム、ジルコニア、金属珪素−炭化珪素複合材料等を使用することができる。
上記したハニカム構造体の製造方法に基づき、異なるセル構造を有する複数のセル領域によって形成された複数のハニカム構造体(実施例1〜20、比較例1〜4)を作製した。これらの実施例1〜20、及び比較例1〜4についてまとめたものを下記表1に示す。表1において、第一セル構造、第二セル構造、及び第三セル構造は、それぞれ“X/Y”で表され、Xは1/1000インチ当たりの長さ、Yは1平方インチあたりのセル数を示している。
ハニカム構造体にNOxを含む試験用ガスを流し、更に当該ハニカム構造体から排出された排出ガスのNOx量をガス分析計(HORIBA社製:MEXA9100EGR)で分析することにより、NOx浄化率の値を求めた。ここで、ハニカム構造体に流入させる試験用ガスのガス温度を200℃に設定し、ハニカム構造体及び試験用ガスの調製のために赤外線イメージ炉を用いた。使用する試験用ガスは、窒素に、二酸化炭素5vol%、酸素14Vol%、一酸化炭素350ppm(体積基準)、アンモニア350ppm(体積基準)、及び水10Vol%を混合したものを用いた。更に、試験用ガスがハニカム構造体に流入するときの空間速度(SV:Space Velocity)は、100000h−1とした。これらの試験条件に基づいて、NOx浄化率を測定した。各実施例及び比較例のNOx浄化率の判断基準を下記表2に示す。なお、表2に示す判断基準おいて、実施例13〜実施例18のように、三つのセル構造を連結して構成されるハニカム構造体に対しては、それぞれのセル構造の組合わせの中で最も厳しい条件を適用して判断を行っている。
室温条件下に置かれたハニカム構造体に対し、25℃、1気圧で、10Nm3/minの流速で、一方の端面から他方の端面に向かってエアーを流通させた。このとき、流入側の一方の端面におけるエアーの圧力と、流出側の他方の端面におけるエアーの圧力とをそれぞれ測定し、得られた圧力測定値の差を圧力損失の値とした。各実施例及び比較例の圧力損失の判断基準を下記表2に示す。
アイソスタティック強度は、JASOM 505−87に定める方法により、ハニカム構造体をフレキシブルチューブ内に挿入し、水中に閉じこめて水圧を印加し、破壊が生じたときの圧力値を測定した。このアイソスタティック強度が高いほど金属製ケースに収める(キャニング)際の信頼性が高いことを示している。各実施例及び比較例のアイソ強度の判断基準を下記表2に示す。
Claims (8)
- 流体の流路となる複数の多角形状のセルを区画形成する隔壁を有するハニカム構造体であって、
前記ハニカム構造体の軸方向に対して垂直な構造体端面は、
互いに異なるセル構造を呈し、外周部によって囲まれた少なくとも二つ以上のセル領域を有し、
互いに隣接する前記セル領域において、一方の前記セル領域の前記セル構造の第一隔壁に対し、他方の前記セル領域の前記セル構造の第二隔壁が傾斜しているハニカム構造体。 - 前記セルは、
四角形状であり、
前記第一隔壁に対する前記第二隔壁の傾斜角度は、
3〜45°の範囲である請求項1に記載のハニカム構造体。 - 前記セルは、
六角形状であり、
前記第一隔壁に対する前記第二隔壁の傾斜角度は、
65〜90°の範囲である請求項1に記載のハニカム構造体。 - 一方の前記セル領域及び他方の前記セル領域の間の境界線に出現する不完全形状の不完全セルのセル個数は、
前記構造体端面の全セル個数に対して、0.1%以下である請求項1〜3のいずれか一項に記載のハニカム構造体。 - 少なくとも二つ以上の前記セル領域の中で最大の端面面積を有する最大セル領域は、
前記構造体端面の全構造体端面の面積に対して、25〜75%の比率を占める請求項1〜4のいずれか一項に記載のハニカム構造体。 - 互いの前記セル領域の間に介設された接合部を有する請求項1〜5のいずれか一項に記載のハニカム構造体。
- 流体の流路となる複数の多角形状のセルを区画形成する隔壁を有し、軸方向に対して垂直な構造体端面が互いに異なるセル構造を呈し、外周部によって囲まれた少なくとも二つ以上のセル領域を組合わせて形成され、互いに隣接する前記セル領域において、一方の前記セル領域の前記セル構造の第一隔壁に対し、他方の前記セル領域の前記セル構造の第二隔壁が傾斜している請求項1〜5のいずれか一項に記載のハニカム構造体を製造するためのハニカム構造体の製造方法であって、
成形材料を押し出し、前記ハニカム構造体を一体成形する一体成形工程を備えるハニカム構造体の製造方法。 - 流体の流路となる複数の多角形状のセルを区画形成する隔壁を有し、軸方向に対して垂直な構造体端面が互いに異なるセル構造を呈し、外周部によって囲まれた少なくとも二つ以上のセル領域を組合わせて形成され、互いに隣接する前記セル領域において、一方の前記セル領域の前記セル構造の第一隔壁に対し、他方の前記セル領域の前記セル構造の第二隔壁が傾斜しているハニカム構造体を製造するための請求項1〜6のいずれか一項に記載のハニカム構造体の製造方法であって、
成形材料を押し出し、それぞれの前記セル領域毎に成形するセル領域成形工程と、
成形された少なくとも二つ以上の前記セル領域を組合わせて接合する接合工程と
を備えるハニカム構造体の製造方法。
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