JP6847724B2 - 目封止ハニカム構造体 - Google Patents
目封止ハニカム構造体 Download PDFInfo
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- JP6847724B2 JP6847724B2 JP2017054567A JP2017054567A JP6847724B2 JP 6847724 B2 JP6847724 B2 JP 6847724B2 JP 2017054567 A JP2017054567 A JP 2017054567A JP 2017054567 A JP2017054567 A JP 2017054567A JP 6847724 B2 JP6847724 B2 JP 6847724B2
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- 238000007789 sealing Methods 0.000 claims description 108
- 230000002093 peripheral effect Effects 0.000 claims description 101
- 238000005192 partition Methods 0.000 claims description 26
- 230000005484 gravity Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 description 60
- 238000000034 method Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 239000003054 catalyst Substances 0.000 description 11
- 238000005259 measurement Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 9
- 238000005304 joining Methods 0.000 description 9
- 239000004071 soot Substances 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- 229910010271 silicon carbide Inorganic materials 0.000 description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 7
- 239000004927 clay Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
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- 230000000052 comparative effect Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
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- 239000013618 particulate matter Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- SBEQWOXEGHQIMW-UHFFFAOYSA-N silicon Chemical compound [Si].[Si] SBEQWOXEGHQIMW-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
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- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 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 compound [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
- 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
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 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
- 238000006722 reduction reaction Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- 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
- 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
- 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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- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
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- B01J37/0215—Coating
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
- C04B38/0012—Honeycomb structures characterised by the material used for sealing or plugging (some of) the channels of the honeycombs
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- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
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- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
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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
- 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
- F01N3/033—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 in combination with other devices
- F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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Description
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、
複数個の前記ハニカムセグメントが接合されたハニカムセグメント接合体の外周を囲繞するように配設された外周壁と、を備え、
前記ハニカムセグメントが、流入端面から流出端面まで延びる複数のセルを取り囲むように配設された多孔質の隔壁を有し、
それぞれの前記ハニカムセグメントにおける前記セルは、前記流入端面側又は前記流出端面側のいずれか一方の端部が、目封止部によって目封止されており、
前記接合層において、前記外周壁と接するように配置された前記ハニカムセグメント同士を接合する前記接合層を外周接合層とし、前記ハニカムセグメント接合体の前記セルの延びる方向に直交する断面の重心を含む又は当該重心に最も近い位置に存在する前記ハニカムセグメントと、当該ハニカムセグメントに隣接する他の前記ハニカムセグメントとを接合する前記接合層を中央接合層とし、前記外周接合層の接合強度A1は、前記中央接合層の接合強度A2よりも大であり、前記外周接合層の前記接合強度A1が、前記中央接合層の前記接合強度A2の1.2〜1.6倍である、目封止ハニカム構造体。
本発明の目封止ハニカム構造体の第一実施形態は、図1〜図4に示すように、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。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周壁21を更に備えている。本実施形態の目封止ハニカム構造体100は、排ガス中に含まれる粒子状物質を除去するための捕集フィルタとして好適に利用することができる。
式(1):接合強度A1=破壊荷重F1/接合面の面積S1
式(2):接合強度A2=破壊荷重F2/接合面の面積S2
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。
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(kneader)を用いて混練し、坏土を得た。
まず、外周接合層を含む2つの外周ハニカムセグメントを切り出して、外周部における接合強度(即ち、接合強度A1)を測定するための測定試料を作製した。作製した測定試料を、せん断荷重測定器を使用し、外周ハニカムセグメントの端面に、荷重速度が2mm/minとなるように荷重を加えていき、外周接合層が破壊する際の破壊荷重F1を測定した。また、2つの外周ハニカムセグメントを接合する外周接合層の接合面の面積S1を測定し、上記式(1)に基づいて、接合強度A1としての「外周部における接合強度(kPa)」を求めた。また、中央接合層を含む中央ハニカムセグメントと他のハニカムセグメントとを切り出して、中央部における接合強度(即ち、接合強度A2)を測定するための測定試料を作製した。作製した測定試料を、せん断荷重測定器を使用し、上記と同様の方法で、中央接合層が破壊する際の破壊荷重F2を測定した。また、中央接合層の接合面の面積S2を測定し、上記式(2)に基づいて、接合強度A2としての「中央部における接合強度(kPa)」を求めた。
目封止ハニカム構造体を、炉内の温度が200℃の電気炉に入れて2時間加熱し、目封止ハニカム構造体の均一な温度にした。その後、加熱した目封止ハニカム構造体を電気炉から取り出し、室温まで急速に冷却する。急速冷却後の目封止ハニカム構造体について、外周壁におけるクラックの発生を確認する。外周壁にクラックが発生していない場合には、炉内の温度を25℃ずつ上昇させて、外周壁にクラックが発生するまで、上記した加熱と急速冷却とを繰り返し行う。外周壁にクラックが発生した炉内温度よりも1回前の操作の炉内温度を、急速冷却試験における測定値とする。
目封止ハニカム構造体を、ディーゼルエンジンの排気系に搭載し、この目封止ハニカム構造体にススを堆積させた。次いで、排ガス温度を2℃/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。このような条件で目封止ハニカム構造体内に堆積したススを燃焼させ、目封止ハニカム構造体の再生を行なった。目封止ハニカム構造体内のススの堆積割合を次第に増加させて、上記した試験(目封止ハニカム構造体の再生)を繰り返し行った。なお、ススの堆積割合とは、目封止ハニカム構造体の単位容積あたり(1Lあたり)の、目封止ハニカム構造体内に堆積したススの質量(g)の割合である。そして、目封止ハニカム構造体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。クラック限界が、6g/L未満である場合を「B」とした。6g/L以上である場合を「A」とした。
表2に示すような接合強度となるように調製した接合材を使用したこと以外は、実施例1と同様の方法で、目封止ハニカム構造体を製造した。
ハニカムセグメント、及びハニカム接合体の構成を表1に示すように変更し、また、表2に示すような接合強度となるように調製した接合材を使用したこと以外は、実施例1と同様の方法で、目封止ハニカム構造体を製造した。
ハニカムセグメント接合体を作製する際に接合材として、1種類の接合材を用いて、目封止ハニカム構造体を製造したこと以外は、実施例1と同様の方法で、目封止ハニカム構造体を製造した。
実施例1〜3の目封止ハニカム構造体は、比較例1の目封止ハニカム構造体に比して、急速冷却試験において良好な結果を得ることができた。また、比較例2の目封止ハニカム構造体は、接合層の接合強度が外周部と中央部の双方において高く、急速冷却試験において良好な結果を得ることができたが、クラック限界評価において、クラック限界が6g/L未満となってしまった。また、実施例4〜6の目封止ハニカム構造体は、比較例3の目封止ハニカム構造体に比して、急速冷却試験において良好な結果を得ることができた。
Claims (2)
- 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、
複数個の前記ハニカムセグメントが接合されたハニカムセグメント接合体の外周を囲繞するように配設された外周壁と、を備え、
前記ハニカムセグメントが、流入端面から流出端面まで延びる複数のセルを取り囲むように配設された多孔質の隔壁を有し、
それぞれの前記ハニカムセグメントにおける前記セルは、前記流入端面側又は前記流出端面側のいずれか一方の端部が、目封止部によって目封止されており、
前記接合層において、前記外周壁と接するように配置された前記ハニカムセグメント同士を接合する前記接合層を外周接合層とし、前記ハニカムセグメント接合体の前記セルの延びる方向に直交する断面の重心を含む又は当該重心に最も近い位置に存在する前記ハニカムセグメントと、当該ハニカムセグメントに隣接する他の前記ハニカムセグメントとを接合する前記接合層を中央接合層とし、前記外周接合層の接合強度A1は、前記中央接合層の接合強度A2よりも大であり、前記外周接合層の前記接合強度A1が、前記中央接合層の前記接合強度A2の1.2〜1.6倍である、目封止ハニカム構造体。 - 前記外周接合層の前記接合強度A1が、850〜1200kPaである、請求項1に記載の目封止ハニカム構造体。
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