JP2015182926A - ハニカム構造体の製造方法 - Google Patents
ハニカム構造体の製造方法 Download PDFInfo
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- JP2015182926A JP2015182926A JP2014061484A JP2014061484A JP2015182926A JP 2015182926 A JP2015182926 A JP 2015182926A JP 2014061484 A JP2014061484 A JP 2014061484A JP 2014061484 A JP2014061484 A JP 2014061484A JP 2015182926 A JP2015182926 A JP 2015182926A
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- honeycomb
- bonding material
- manufacturing
- mass
- honeycomb structure
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Abstract
【解決手段】成形原料を成形して、流体の流路となる一方の端面から他方の端面まで延びる複数のセルを区画形成する隔壁を有する、四角柱状のハニカム成形体を複数個形成する成形工程と、複数のハニカム成形体を焼成して、複数の四角柱状のハニカム焼成体を形成する焼成工程と、複数のハニカム焼成体の少なくとも一部について、少なくとも一部の側面にシート状の接合材を貼り付けるシート状接合材貼り付け工程と、複数の四角柱状のハニカム焼成体を、それぞれの側面同士を接合材で接合しながら組み合わせて、複数のハニカム焼成体が積層されたハニカムブロック体を作製するハニカムブロック体作製工程と、ハニカムブロック体の外周部分を研削してハニカム構造体を得る研削工程とを有するハニカム構造体の製造方法。
【選択図】なし
Description
まず、セラミック原料にバインダ、界面活性剤、造孔材、水等を添加して成形原料とすることが好ましい。セラミック原料としては、炭化珪素、珪素−炭化珪素系複合材料、コージェライト化原料、コージェライト、ムライト、アルミナ、チタニア、スピネル、炭化珪素−コージェライト系複合材料、リチウムアルミニウムシリケート、チタン酸アルミニウム、鉄−クロム−アルミニウム系合金からなる群から選択される少なくとも1種であることが好ましい。これらの中でも、炭化珪素又は珪素−炭化珪素系複合材料が好ましい。尚、コージェライト化原料とは、シリカが42〜56質量%、アルミナが30〜45質量%、マグネシアが12〜16質量%の範囲に入る化学組成となるように配合されたセラミックス原料であって、焼成されてコージェライトになるものである。珪素−炭化珪素系複合材料とする場合、炭化珪素粉末及び金属珪素粉末を混合したものをセラミック原料とする。
次に、各ハニカム成形体を焼成して、図2に示す四角柱状のハニカム焼成体2を複数個得る。複数のハニカム焼成体は、いずれも同じ形状であることが好ましい。焼成の前に、バインダ等を除去するため、脱脂(仮焼成)を行うことが好ましい。仮焼成は大気雰囲気において、400〜500℃を最高温度として、0.5〜20時間温度を保持して行うことが好ましい。仮焼成及び焼成の方法は特に限定されず、電気炉、ガス炉等を用いて焼成することができる。炭化珪素又は珪素−炭化珪素系複合材料の場合、焼成条件は、窒素、アルゴン等の不活性雰囲気において、1300〜1500℃の最高温度で、1〜10時間加熱保持することが好ましい。
次に、複数のハニカム焼成体2の少なくとも一部について、少なくとも一部の側面2aにシート状の接合材3を貼り付けることが好ましい(図3参照)。接合材3は、「ハニカムブロック体を作成する際に、全ての「ハニカム焼成体とハニカム焼成体との間」に接合材が充填された状態になる」ように、各ハニカム焼成体の側面に、適宜、貼り付けることが好ましい。
次に、複数の四角柱状のハニカム焼成体を、それぞれの側面同士を接合材で接合しながら組み合わせて、図4に示すような、複数のハニカム焼成体2が積層されて形成されたハニカムブロック体5を作製する。
次に、ハニカムブロック体の外周部分を研削して、図6に示されるようなハニカム構造体100を得ることが好ましい。ハニカム構造体100は、複数のハニカムセグメント4が、それぞれの側面同士が接合部6によって接合されたものである。
炭化珪素粉、金属珪素粉を80:20の質量割合で混合して、セラミック原料とした。そして、セラミック原料に、界面活性剤、造孔材、成形助材及び水を混合して混練し、真空土練機により円柱状の坏土を作製した。造孔材としては、発泡樹脂を用いた。成形助材としては、メチルセルロースを用いた。セラミック原料100質量部に対して造孔材を2質量部混合した。セラミック原料100質量部に対して成形助材を5質量部混合した。セラミック原料100質量部に対して水を29質量部混合した。炭化珪素粉の平均粒子径は、40μmであった。平均粒子径は、粒度分析装置を用いる方法で測定した値である。
「INSTRON社 インストロン5500シリーズ」に、ゲル強度の測定に使用する治具を取り付ける。接合材のバルク体を治具にセットし、圧縮荷重をかけることにより測定する。接合材のバルク体の形状は、直径50mm×高さ50mmの円柱体であった。測定条件は、「1.0mm/min」とした。
ハニカム構造体より、隣接する2本のセグメントを接合された状態のまま切り出し、一方のセグメントを固定し、もう一方のセグメントに対してその長軸方向から荷重をかけることにより測定する。荷重をかけて、2本のセグメントが分断されたときの、最大荷重をせん断強度とする。せん断強度は、200kPa以上が合格である。
各条件を表1に示すように変更した以外は、実施例1と同様にしてハニカム構造体を作製した。実施例1の場合と同様にして、「接合幅」、「圧縮強度」及び「せん断強度」を測定した。「接合幅」は、いずれも1.0mmであった。「圧縮強度」及び「せん断強度」の測定結果を表1に示す。
実施例1と同様にして、16個のハニカム焼成体を作製した。
各条件を表1に示すように変更した以外は、実施例1と同様にしてハニカム構造体を作製した。実施例1の場合と同様にして、「接合幅」、「圧縮強度」及び「せん断強度」を測定した。「接合幅」は、いずれも1.0mmであった。「圧縮強度」及び「せん断強度」の測定結果を表1に示す。
Claims (7)
- 成形原料を成形して、流体の流路となる一方の端面から他方の端面まで延びる複数のセルを区画形成する隔壁を有する、四角柱状のハニカム成形体を複数個形成する成形工程と、
複数の前記ハニカム成形体を焼成して、複数の四角柱状のハニカム焼成体を形成する焼成工程と、
複数の前記ハニカム焼成体の少なくとも一部について、少なくとも一部の側面にシート状の接合材を貼り付けるシート状接合材貼り付け工程と、
複数の前記四角柱状のハニカム焼成体を、それぞれの側面同士を前記接合材で接合しながら組み合わせて、前記複数のハニカム焼成体が積層されたハニカムブロック体を作製するハニカムブロック体作製工程と、
前記ハニカムブロック体の外周部分を研削してハニカム構造体を得る研削工程とを有し、
得られたハニカム構造体のせん断強度が200kPa以上であるハニカム構造体の製造方法。 - 前記接合材が、寒天を含有する請求項1に記載のハニカム構造体の製造方法。
- 前記接合材中に寒天が、0.08〜0.40質量%含有されている請求項1又は2に記載のハニカム構造体の製造方法。
- 前記接合材中に水が、20〜45質量%含有されている請求項1〜3のいずれかに記載のハニカム構造体の製造方法。
- 前記接合材中にセラミック原料が、20〜40質量%含有されている請求項1〜4のいずれかに記載のハニカム構造体の製造方法。
- 前記接合材の厚さが、0.5〜6.0mmである請求項1〜5のいずれかに記載のハニカム構造体の製造方法。
- 前記接合材の圧縮強度が、5〜55Nである請求項1〜6のいずれかに記載のハニカム構造体の製造方法。
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