JP6620049B2 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
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- JP6620049B2 JP6620049B2 JP2016061394A JP2016061394A JP6620049B2 JP 6620049 B2 JP6620049 B2 JP 6620049B2 JP 2016061394 A JP2016061394 A JP 2016061394A JP 2016061394 A JP2016061394 A JP 2016061394A JP 6620049 B2 JP6620049 B2 JP 6620049B2
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- honeycomb structure
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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 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 4
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
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- 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 2
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- 229910052863 mullite Inorganic materials 0.000 description 2
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 2
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- 239000002245 particle Substances 0.000 description 2
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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 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 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
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
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- SBEQWOXEGHQIMW-UHFFFAOYSA-N silicon Chemical compound [Si].[Si] SBEQWOXEGHQIMW-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 229910052596 spinel Inorganic materials 0.000 description 1
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Images
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- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Structural Engineering (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Catalysts (AREA)
- Filtering Materials (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Description
図1〜図3に示すように、本発明のハニカム構造体の一の実施形態は、多孔質の隔壁1、及びこの隔壁1の外周を囲繞するように配設された外周壁3を有する、柱状のハニカム構造部4を備えた、ハニカム構造体100である。ハニカム構造部4の隔壁1は、流入端面11から流出端面12まで延びる流体の流路となる複数のセル2を区画形成するものである。本実施形態のハニカム構造体100は、ハニカム構造部4が、以下のように構成されている点に特徴を有する。ハニカム構造部4は、中央セル構造15と、最外周セル構造16と、最外周セル構造16と中央セル構造15との境界部分に配設された境界壁8と、を有するものである。そして、中央セル構造15と、最外周セル構造16とが、異なる構造である。ここで、中央セル構造15とは、ハニカム構造部4のセル2の延びる方向に直交する面において、ハニカム構造部4の中央部分に形成された複数のセル2aによって構成された構造のことである。最外周セル構造16とは、上記面において、ハニカム構造部4の最外周に形成された完全セル2xを含む複数のセル2bによって構成された構造のことである。完全セル2xを含む複数のセル2bは、中央セル構造15よりも外側の外周部分に形成された複数のセル2bのことである。そして、本実施形態のハニカム構造体100は、最外周セル構造16と中央セル構造15との境界部分に配設された境界壁8の厚さが、外周壁3の厚さよりも厚くなるように構成されている。
次に、本発明のハニカム構造体を製造する方法について説明する。
コージェライト化原料100質量部に、分散媒を35質量部、有機バインダを6質量部、分散剤を0.5質量部、それぞれ添加し、混合、混練して坏土を調製した。コージェライト化原料としては、アルミナ、水酸化アルミニウム、カオリン、タルク、及びシリカを使用した。分散媒としては水を使用し、造孔材としては平均粒子径1〜10μmのコークスを使用し、有機バインダとしてはヒドロキシプロピルメチルセルロースを使用し、分散剤としてはエチレングリコールを使用した。
アイソスタティック(Isostatic)強度の測定は、社団法人自動車技術会発行の自動車規格(JASO規格)のM505−87で規定されているアイソスタティック破壊強度試験に基づいて行った。アイソスタティック破壊強度試験は、ゴムの筒状容器に、ハニカム構造体を入れてアルミ製板で蓋をし、水中で等方加圧圧縮を行う試験である。すなわち、アイソスタティック破壊強度試験は、缶体に、ハニカム構造体が外周面把持される場合の圧縮負荷加重を模擬した試験である。このアイソスタティック破壊強度試験によって測定されるアイソスタティック強度は、ハニカム構造体が破壊したときの加圧圧力値(MPa)で示される。本実施例におけるアイソスタティック強度評価においては、基準となる比較例1,7,11のハニカム構造体の加圧圧力値(MPa)と、評価対象のハニカム構造体の加圧圧力値(MPa)を比較した相対評価とした。なお、実施例1〜23及び比較例2〜6は、比較例1を基準とする。実施例24〜36及び比較例8〜10は、比較例7を基準とする。実施例37〜44及び比較例12〜14は、比較例11を基準とする。評価の判定基準は、以下の通りである。
評価A:アイソスタティック強度が基準より30%を超えて向上した場合を、その評価を「優」とする。
評価B:アイソスタティック強度が基準と同等(±30%以内)の場合を、その評価を「良」とする。
評価C:アイソスタティック強度が基準の70%未満の場合を、その評価を「不可」とする。
「セル構造の種類」、「境界壁の有無」、及び「セル構造」を表1のように変更し、且つ、「境界壁の厚さ」を表2に示すように変更して、実施例2〜23、比較例1〜6のハニカム構造体を作製した。
「セル構造の種類」、「境界壁の有無」、及び「セル構造」を表3のように変更し、且つ、「境界壁の厚さ」を表4に示すように変更して、実施例24〜36、比較例7〜10のハニカム構造体を作製した。
「セル構造の種類」、「境界壁の有無」、及び「セル構造」を表5のように変更し、且つ、「境界壁の厚さ」、及び「隔壁の気孔率」を表6に示すように変更して、実施例37〜44、比較例11〜14のハニカム構造体を作製した。
実施例1〜44のハニカム構造体は、境界壁の厚さが、外周壁の厚さよりも厚くなるように構成されたものであり、基準となる各比較例のハニカム構造体と比較して、アイソスタティック強度が高いものであった。一方、比較例2のような、外周壁の厚さよりも薄い境界壁を有するハニカム構造体や、比較例3のような、外周壁の厚さと同じ厚さの境界壁を有するハニカム構造体は、比較例1のハニカム構造体と比して、アイソスタティック強度の低下するものとなった。即ち、最外周セル構造と中央セル構造とが異なる構造のハニカム構造体では、境界壁の厚さが、外周壁の厚さと同等又はそれ以下であると、基準となる比較例1と同じ加圧条件下において、境界壁の近傍に、比較例1にて発生するよりも高い最大応力値が発生する。したがって、最外周セル構造と中央セル構造とが異なる構造のハニカム構造体では、各比較例のように、境界壁の厚さが、外周壁の厚さと同等又はそれ以下であると、アイソスタティック強度が低下することが判明した。
Claims (4)
- 流入端面から流出端面まで延びる流体の流路となる複数のセルを区画形成する多孔質の隔壁、及び前記隔壁の外周を囲繞するように配設された外周壁を有する、柱状のハニカム構造部を備え、
前記セルのうち、前記隔壁によって周囲の全てが区画されているセルを完全セルとし、
前記ハニカム構造部は、前記ハニカム構造部の最外周に形成された前記完全セルを含む最外周セル構造と、前記最外周セル構造よりも内側の中央部分に形成された複数の前記セルによって構成された中央セル構造と、前記最外周セル構造と前記中央セル構造との境界部分に配設された境界壁と、を有し、
前記隔壁、前記境界壁、及び前記外周壁が一体に構成された一体成形品であり、
前記最外周セル構造と前記中央セル構造とは、異なる構造であり、且つ、
前記境界壁の厚さが、前記外周壁の厚さよりも厚く、
前記中央セル構造が、1種類のセル構造、又はセル密度が異なる2つ以上のセル構造によって構成されており、前記2つ以上のセル構造によって構成された前記中央セル構造は、当該2つ以上のセル構造の境界部分に中央境界壁を有し、前記中央境界壁の厚さが、前記外周壁の厚さよりも厚く、
前記外周壁の厚さが、0.2〜1.0mmであり、前記境界壁及び前記中央境界壁の厚さが、前記外周壁の厚さの117〜300%の厚さである、ハニカム構造体。 - 前記境界壁の厚さが、前記外周壁の厚さの150〜300%の厚さである、請求項1に記載のハニカム構造体。
- 前記中央セル構造のセル密度が、前記最外周セル構造のセル密度よりも大である、請求項1又は2に記載のハニカム構造体。
- 前記中央セル構造における前記セルの繰り返し単位の配列方向が、前記最外周セル構造における前記セルの繰り返し単位の配列方向に対して、10°以上、50°未満傾いている、請求項1〜3のいずれか一項に記載のハニカム構造体。
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