JP6644691B2 - 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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- JP6644691B2 JP6644691B2 JP2016546115A JP2016546115A JP6644691B2 JP 6644691 B2 JP6644691 B2 JP 6644691B2 JP 2016546115 A JP2016546115 A JP 2016546115A JP 2016546115 A JP2016546115 A JP 2016546115A JP 6644691 B2 JP6644691 B2 JP 6644691B2
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- outer peripheral
- honeycomb structure
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- silicon carbide
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- 239000000463 material Substances 0.000 title claims description 78
- 230000002093 peripheral effect Effects 0.000 claims description 201
- 239000011248 coating agent Substances 0.000 claims description 69
- 238000000576 coating method Methods 0.000 claims description 69
- 239000010410 layer Substances 0.000 claims description 34
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 32
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 32
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 28
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 22
- 239000008119 colloidal silica Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 5
- 229910052878 cordierite Inorganic materials 0.000 claims description 4
- 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 claims description 4
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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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坏土を、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。ここで、ハニカム構造体の気孔率は63%である。
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1〜6、比較例1〜3)のコロイダルシリカ、炭化珪素、酸化チタン、及び水のそれぞれの配合比率を下記の表1に示す。ここで、実施例1〜6は、コロイダルシリカ、炭化珪素、酸化チタン、及び水の配合比率が、いずれも本発明に規定された範囲内のものであり、比較例1〜3は、本発明に規定された配合比率の範囲からいずれも外れるものである。使用したコロイダルシリカの平均粒径は、13〜17nmの範囲のものであり、炭化珪素の平均粒径は2〜3μm、酸化チタンの平均粒径は0.2〜0.3μmのものである。すなわち、発色剤として機能する炭化珪素及び酸化チタンに比べ、結合材として機能するコロイダルシリカの平均粒径が著しく小さく、また、炭化珪素に対し異なる平均粒径の酸化チタンが使用される。これらの各成分がそれぞれ均一に分散したスラリーの状態で、粘度が100〜500mPa・sの範囲になるように調製される。
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外周コート材をスプレー方式で塗工することにより、外周コート層を得た。このとき、外周コートをスプレーするエアー圧は0.20MPaに設定した。更に、詳しく説明すると、上記ハニカム構造体を、軸方向を上下方向に一致させた状態で円板状のターンテーブルの上に載置する。このターンテーブルは軸方向に従って所定速度で回転することができる。
形成された外周コート層に対する塗布ムラ、触媒液の染み出し、レーザー印字性、膜密着性(テープ剥離)、膜耐熱性(650℃/3hr)、コート後及び熱処理後のインクジェット印字性についてそれぞれ評価した。その結果をまとめたものを表1に示す。
外周コート材の表面を目視によって確認し、塗布ムラのないものを“良”の評価、塗布ムラが確認されるものを“不可”の評価とした。
200倍に希釈した墨汁を、外周コートハニカム構造体の端面から吸い上げ、乾燥させた後、外周コート材の表面に墨汁の染み出しが目視によって確認できるか否かで評価を行った。ここで、墨汁の染み出しが確認されなかったものを“良”の評価、確認できるものを“不可”の評価とした。
バーコードリーダー(Sick社製)を用い、外周コート層の層表面に印字されたレーザー印字の読み取りを行った。バーコードリーダーによる読み取りが可能であったものを“良”の評価、読み取りができなかったものを“不可”の評価とした。
形成された外周コート層にテープを貼付し、所定の力で剥がすことにより、外周面から外周コート層の膜が剥がれるか否かを確認し、膜の剥がれがないものを“良”の評価、膜の剥がれがあり基材が露出したものを“不可”の評価とした。
外周コートハニカム構造体を、炉内温度を650℃に維持した高温炉の中に3hr載置し、熱処理を行い、3hr経過後に高温炉から取り出された熱処理後の外周コートハニカム構造体の外周コート層の表面を目視による確認を行い、クラックが確認されないものを“良”の評価、クラックが確認されたものを“不可”の評価とした。
インクジェット印字後の印字面を指で擦り、指にインクが付着しないものを“良”の評価、指にインクが付着するものを“不可”の評価とした。
Claims (4)
- コロイダルシリカ、炭化珪素、及び前記炭化珪素と平均粒径の異なる酸化チタンを含有する外周コート材であって、
前記コロイダルシリカを15〜50質量%含有し、
前記炭化珪素を25〜35質量%含有し、
前記酸化チタンを25〜35質量%含有し、
押出成形によって一体的に形成された、気孔率が50〜75%のコージェライトを主成分として含む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外周コート材。 - 前記コロイダルシリカを15〜30質量%含有し、
前記炭化珪素を30〜35質量%含有し、
前記酸化チタンを30〜35質量%含有し、
水を0〜15質量%含有する請求項1に記載の外周コート材。 - 前記炭化珪素の平均粒径は、
1.0〜10μmであり、
前記炭化珪素と異なる前記酸化チタンの平均粒径は、
0.1〜1.0μmである請求項1または2に記載の外周コート材。 - 請求項1〜3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、
流路を形成する一方の端面から他方の端面に延びる複数の多角形のセルを区画形成する格子状の多孔質の隔壁を備えるハニカム構造体と、
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
を有する外周コートハニカム構造体。
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