JP2018158859A - 外周コート材、及び外周コートハニカム構造体 - Google Patents
外周コート材、及び外周コートハニカム構造体 Download PDFInfo
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Abstract
Description
成形材料を所定の配合比率で調合し、混合及び混練することで得られた成形材料(杯土)を、押出成形機を利用して押出成形し、ハニカム成形体を得た。得られたハニカム成形体を乾燥後、所定の温度で焼成することでハニカム構造体を作製した。本実施例において、ハニカム構造体は、コージェライトを主成分とするものである。作製されたハニカム構造体は、多孔質の隔壁を有し、当該隔壁によって複数のセルが区画形成されている。
上記(1)によって作製されたハニカム構造体の外周面に塗布される外周コート材(実施例1〜4、比較例1〜4)をセラミックス原料として二種類の平均粒子径の異なる粒子状のコージェライト粒子の混合物(Cd混合物)を主成分として用い、その他の造孔材等を添加して作製した。Cd混合物の粒度分布における第一の極大値R1及び第二の極大値R2の値を下記表1にそれぞれ示す。ここで、実施例1〜4は、第一Cd粒子の平均粒子径D50が14μm〜40μmの範囲であり、第二Cd粒子の平均粒子径D50が55〜207μmの範囲である。更に、第一の極大値R1が13μm〜59μmの範囲であり、一方、第二の極大値R2が67μm〜231μmの範囲のものである。なお、実施例1〜4の場合、外周コート材のセラミックス原料の中に平均繊維長さが55μmの繊維材を含んでいる(図3参照)。
上記(2)によって調製されたそれぞれの外周コート材を(1)によって作製されたハニカム構造体の外周面に塗布し、外周コート層を形成する。本実施例では、ハニカム構造体の外周面にペースト状の外周コート材を塗布し、乾燥機にて1時間乾燥した。外周面への塗布に際しては、公知の各種の塗布法が適宜に採用され、例えば、はけ塗り法やディッピング法、またコート材の粘度を低下させて行なうスプレーコート法、流し込みによるコート法等を適宜採用することができる。
形成された外周コート層に対する“ハニカム構造体への塗布性”、“外周コート層の最大高さ粗さRz”、“降伏温度”、“振動試験後のずれ”、及び、“振動試験後の剥離”についてそれぞれ評価を行った。その結果をまとめたものを上記表1に示す。
上記(3)の外周コート層の形成によって、得られた外周コート層の表面を目視によって確認した。塗布ムラのないものを“良”の評価、塗布ムラがある、或いは塗布自体が困難であったものを“不可”の評価とした。
外周コート材を塗布し、外周コート層の形成された実施例1〜4及び比較例1〜4(比較例1を除く)の外周コートハニカム構造体に対し、円周方向に沿って15mmの間隔で触針式表面粗さ測定器(テーラーホブソン社製、FORM TALYSURF S5K−6)を用い、8箇所の測定を行った。得られた結果に基づいて、最大高さ粗さRzを算出した。算出結果を表1に示す。
示差検出型の熱膨張計を用い、実施例1〜4、及び比較例1〜4の外周コート材の40℃から1000℃までの熱膨張曲線を測定した。得られた熱膨張曲線において、極大値が観察される場合、当該極大値の位置を降伏温度とした。極大値が観察されない場合は、“無し”とした。なお、降伏温度の測定には、外周コート材を均一の条件で所定のサイズに固めた試料片を測定試料として用いた。降伏温度の測定結果を表1に示す。
外周コート層を形成した外周コートハニカム構造体の外周面(外周コート層の層表面)に、緩衝材として無膨張マットを巻設し、金属製の缶体内に圧入して収容した。缶体に収容した状態で40Gの振動を8時間継続的に加える実験を行った。このとき、缶体内には、流量2Nm3/minの大気ガスを流した。実験終了後の外周コートハニカム構造体の初期位置からのずれの有無を目視にて確認した。更に、実験終了後の外周コートハニカム構造体の外周コート層に欠けやハニカム構造体の外周面からの剥離の有無を目視にて確認した。これらの評価結果を表1に示す。
表1に示されるように、実施例1〜4の外周コートハニカム構造体は、いずれも良好な塗布性を有し、最大高さ粗さRzも本発明において規定した範囲内のものであった。更に、振動試験後のずれ及びコート材剥離が全く確認されなかった。すなわち、異なる平均粒子径の二種類のセラミックス粒子(第一セラミックス粒子及び第二セラミックス粒子)を用い、粒度分布が二つの極大値を有するCd混合物(セラミックス混合物)を使用した外周コート材は優れた効果を奏することが確認された。
Claims (6)
- 押出成形によって形成されたセラミックス製のハニカム構造体の外周面に塗布され、外周コート層を形成するセラミックス原料を含む外周コート材であって、
前記セラミックス原料は、
粒子状の第一セラミックス粒子、及び、前記第一セラミックス粒子と異なる平均粒子径を有する、粒子状の第二セラミックス粒子を含むセラミックス混合物と、
長片状の繊維材と
を備え、
前記セラミックス混合物の粒度分布は、
少なくとも二つの極大値を有し、
前記繊維材の長手方向の平均繊維長さは、
30〜100μmの範囲である外周コート材。 - 前記セラミックス混合物の前記粒度分布における第一の極大値は、
5〜70μmの範囲にあり、
前記粒度分布における第二の極大値は、
40〜280μmの範囲にある請求項1に記載の外周コート材。 - 前記繊維材は、
結晶性無機ファイバーである請求項1または2に記載の外周コート材。 - 前記第一セラミックス粒子及び前記第二セラミックス粒子は、
同一成分である請求項1〜3のいずれか一項に記載の外周コート材。 - 請求項1〜4のいずれか一項に記載の外周コート材を用いた外周コートハニカム構造体であって、
一方の端面から他方の端面まで延びる、流体の流路を形成する複数のセルを区画形成する多孔質の隔壁を備えるセラミックス製のハニカム構造体と、
前記ハニカム構造体の外周面の少なくとも一部に前記外周コート材を塗布して形成された外周コート層と
を具備する外周コートハニカム構造体。 - 前記外周コート層の最大高さ粗さRzは、
50〜250μmの範囲である請求項5に記載の外周コートハニカム構造体。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017055722A JP2018158859A (ja) | 2017-03-22 | 2017-03-22 | 外周コート材、及び外周コートハニカム構造体 |
| US15/906,173 US11142485B2 (en) | 2017-03-22 | 2018-02-27 | Circumferential coating material, circumferential coated honeycomb structure |
| CN201810181369.5A CN108623329A (zh) | 2017-03-22 | 2018-03-06 | 外周涂层材料及外周涂层蜂窝结构体 |
| DE102018203435.4A DE102018203435B4 (de) | 2017-03-22 | 2018-03-07 | Verfahren zur Herstellung einer umfangsbeschichteten Wabenstruktur und umfangsbeschichtete Wabenstruktur |
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| JP7304403B2 (ja) * | 2019-02-28 | 2023-07-06 | 日本碍子株式会社 | ハニカム構造体、及びその製造方法 |
| CN113387725B (zh) * | 2021-06-30 | 2022-07-19 | 江西省萍乡市湘东石油化工填料厂 | 一种用于蜂窝陶瓷蓄热体表面改性锆刚玉料浆及其制浆方法、用途 |
| CN119080532A (zh) * | 2024-08-21 | 2024-12-06 | 宜兴王子制陶有限公司 | 一种快速干燥的SiC蜂窝陶瓷外皮、具备该外皮的SiC蜂窝陶瓷及该蜂窝陶瓷的制备方法 |
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| JP2001329836A (ja) * | 2000-05-23 | 2001-11-30 | Hitachi Metals Ltd | セラミックハニカム構造体 |
| JP2002070545A (ja) * | 2000-08-25 | 2002-03-08 | Ibiden Co Ltd | セラミックハニカム構造物の収容構造 |
| WO2009014200A1 (ja) * | 2007-07-26 | 2009-01-29 | Ngk Insulators, Ltd. | ハニカム構造体用コーティング材 |
| JP2015513516A (ja) * | 2012-02-24 | 2015-05-14 | コーニング インコーポレイテッド | 結晶性無機繊維質材料を有するセメント表皮組成物を含むハニカム構造体 |
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| US5629067A (en) | 1992-01-30 | 1997-05-13 | Ngk Insulators, Ltd. | Ceramic honeycomb structure with grooves and outer coating, process of producing the same, and coating material used in the honeycomb structure |
| DE10031123B4 (de) | 2000-06-30 | 2005-06-23 | Forschungszentrum Jülich GmbH | Verfahren zum Herstellen planarer Anodensubstrate für Hochtemperaturbrennstoffzellen |
| EP1726795A4 (en) * | 2004-02-23 | 2008-03-05 | Ibiden Co Ltd | STRUCTURAL BODY OF BEES AND APPARATUS FOR EXHAUST GAS PURIFICATION |
| EP2098497B1 (en) * | 2006-12-27 | 2018-07-25 | Hitachi Metals, Ltd. | Ceramic honeycomb structure and process for producing the same |
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| JP2001329836A (ja) * | 2000-05-23 | 2001-11-30 | Hitachi Metals Ltd | セラミックハニカム構造体 |
| JP2002070545A (ja) * | 2000-08-25 | 2002-03-08 | Ibiden Co Ltd | セラミックハニカム構造物の収容構造 |
| WO2009014200A1 (ja) * | 2007-07-26 | 2009-01-29 | Ngk Insulators, Ltd. | ハニカム構造体用コーティング材 |
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| Publication number | Publication date |
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| DE102018203435A1 (de) | 2018-09-27 |
| CN108623329A (zh) | 2018-10-09 |
| US11142485B2 (en) | 2021-10-12 |
| DE102018203435B4 (de) | 2020-04-23 |
| US20180273432A1 (en) | 2018-09-27 |
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