JP5498705B2 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
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- JP5498705B2 JP5498705B2 JP2008557010A JP2008557010A JP5498705B2 JP 5498705 B2 JP5498705 B2 JP 5498705B2 JP 2008557010 A JP2008557010 A JP 2008557010A JP 2008557010 A JP2008557010 A JP 2008557010A JP 5498705 B2 JP5498705 B2 JP 5498705B2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 9
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- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 1
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
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- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical group [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound 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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Images
Classifications
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- B01J35/56—
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- B01D—SEPARATION
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
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- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
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- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
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- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
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- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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- F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/24149—Honeycomb-like
Description
[式(1)中、WIn:入口側接合幅、WOut:出口側接合幅、OFAIn:入口側開口率、OFAOut:出口側開口率]
[式(2)中、SegIn:ハニカムセグメントの入口側端面面積、SegOut:ハニカムセグメントの出口側端面面積、OFAIn:入口側開口率、OFAOut:出口側開口率]
[WIn:入口側接合幅、WOut:出口側接合幅、OFAIn:入口側開口率、OFAOut:出口側開口率]
[SegIn:ハニカムセグメントの入口側端面面積、SegOut:ハニカムセグメントの出口側端面面積、OFAIn:入口側開口率、OFAOut:出口側開口率]
原料として、SiC粉75質量%及び金属Si粉25質量%の混合粉末を使用し、これにメチルセルロース及びヒドロキシプロポキシルメチルセルロース、界面活性剤及び水を添加して、可塑性の坏土を作製した。この坏土を押出成形し、入口側端面から5mmのところまでに抑え板を置いて加圧することで、セグメントの断面サイズを小さくし、その後、マイクロ波及び熱風で乾燥して、気孔率43%、平均気孔径約10μm、隔壁厚さ10mil、セル密度約47セル/cm2(300セル/平方インチ)のハニカムセグメントを得た。これを、端面が市松模様状を呈するように、隣接する前記流通孔が互いに反対側となる一方の端部でハニカム構造体の製造に用いた材料と同様の材料で目封止して、乾燥させた後、N2雰囲気中約400℃で脱脂し、その後Ar不活性雰囲気中で約1550℃で焼成して、Si結合SiCのハニカムセグメントを得た。これをアルミノシリケート質、炭化珪素粉及びシリカゲルに有機及び無機のバインダーの混合物を用いて接合して200℃で乾燥硬化した後、切削により直径144mm×長さ152mmのDPF用の円柱状ハニカム構造体を得た。入口OFA=0.436%、出口OFA=0.258%、α=0.05、セグメント面積1246.1mm2、WIn=1.04mm、WOut=1.00mmであった。
図7および8に示すように、ハニカム構造体1の目封止部分22に幅5mmの帯21を巻き付け、その締め付け強度を上げていき、端面が破壊する巻き付け強度を測定する。
2.0Lのディーゼルエンジンの排ガス流路に、DOC(酸化触媒)およびDPFとしての本発明のハニカム構造体をこの順で配設する。エンジン状態を1700rpm、90Nmにして、ポストインジェクションを入れることで、DPF入口ガス温度を上昇させる。DPF内部温度が上昇していき、DPF内部の堆積微粒子が燃焼する。そして、DPF前後の圧力損失が下がり始めたところでポストインジェクションをやめて、エンジン状態をアイドルに切り替えることで、排気ガス中の酸素濃度が上昇し、流量が低下することでDPF内部温度が急激に上昇する。この試験の後、サンプルをエンジンから取り外し、光学顕微鏡にて出口端面にクラックが発生していないか確認する。クラックが発生していた場合、その試験の時の堆積微粒子量を破壊微粒子量と定義する。
(実施例1−1−2)
α=0.30、WIn=1.23とした以外、実施例1−1−1と同様にして円柱状のハニカム構造体を作製した。これを、上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。なお、この実施例1−1−2は、以下説明する実施例において、実施例1−2−1および実施例1−3−1に相当する。
α=0.70、WIn=1.53とした以外、実施例1−1−1と同様にして円柱状のハニカム構造体を作製した。これを、上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。この比較例の場合、締め付け破壊強度および破壊スート量試験の結果は良好であったが、セルの開口率が小さくなり過ぎて圧損が大きい。
入口OFA、出口OFAおよび入口WInを変化させた以外、上記実施例1−1−2と同様にして円柱状のハニカム構造体を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
セグメント端面面積を変化させた以外、上記実施例1−1−2と同様にして円柱状のハニカム構造体を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
α=0、WIn=1.04とした以外、実施例1−1−1と同様にして円柱状のハニカム構造体を作製した。これを、上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
入口側と出口側とで開口率および接合幅が等しい円柱状のハニカム構造体を作製した。これを、上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
隔壁厚さを12milで固定して、αおよびWInを変化させて実施例2−1、2−2および比較例2−1のハニカム構造体を作製した。また、α=0とした比較例2、および、入口側と出口側とで開口率および接合幅が等しい参考例2を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
隔壁厚さを15milとして、αおよびWInを変化させて実施例3−1、3−2および比較例3のハニカム構造体を作製した。また、入口側と出口側とで開口率および接合幅が等しい参考例3を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
隔壁厚さを15mil、セル密度を160cpsiとして、αおよびWInを変化させて実施例3−1、3−2および比較例3のハニカム構造体を作製した。また、入口側と出口側とで開口率および接合幅が等しい参考例3を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
隔壁厚さを15mil、セル密度を160cpsiとして、入口OFA、出口OFAおよび入口WInを変化させて、比較例4−2−2および4−2−3のハニカム構造体を作製した。また、入口側と出口側とで開口率および接合幅が等しい参考例3を作製した。これらを上記締め付け破壊強度および破壊微粒子量試験に付した。結果を表1に示す。
Claims (4)
- 端面の面積が異なる2種類の貫通孔が隔壁を隔てて複数併設されて柱状のハニカムセグメントが構成され、
該ハニカムセグメントは、一方の端面においては、端面の面積の小さい貫通孔が目封止されて開口率が高い入口側が形成され、他の端面においては、端面の面積が大きい貫通孔が目封止されて開口率が低い出口側が形成されており、
複数の前記ハニカムセグメントが接合材を介して、長手方向の向きを揃えて固着されて構成されるハニカム構造体であって、
複数の前記ハニカムセグメントの内、前記ハニカム構造体の外周部に位置するハニカムセグメント以外のハニカムセグメントの断面形状が四角形であり、
入口側の端面の接合材の接合幅(但し、接合幅とは、各端面における、ハニカム構造体の外周部に位置するハニカムセグメント以外のハニカムセグメントの4辺に接する接合部の中央部の平均値を指す)が出口側の端面の接合材の接合幅よりも大きいハニカム構造体。 - 下記式(1)において、0<α<0.7かつ0.3<WOUT<2.5mmを満たす請求項1に記載のハニカム構造体。
WIn=α×{(1−OFAIn)/(1−OFAOut)}+WOut (1)
[式(1)中、WIn:入口側接合幅、WOut:出口側接合幅、OFAIn:入口側開口率、OFAOut:出口側開口率] - 前記ハニカムセグメントは入口側端面の面積が出口側端面の面積より小さい請求項1または2に記載のハニカム構造体。
- 下記式(2)において、0<β<0.7、900<SegOut<3600mm2を満たす請求項1〜3のいずれか一項に記載のハニカム構造体。
SegIn=β×{(1−OFAIn)/(1−OFAOut)}×SegOut (2)
[式(2)中、SegIn:ハニカムセグメントの入口側端面面積、SegOut:ハニカムセグメントの出口側端面面積、OFAIn:入口側開口率、OFAOut:出口側開口率]
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