JP5469305B2 - 接合材とその製造方法、及びそれを用いたハニカム構造体 - Google Patents
接合材とその製造方法、及びそれを用いたハニカム構造体 Download PDFInfo
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- JP5469305B2 JP5469305B2 JP2007550217A JP2007550217A JP5469305B2 JP 5469305 B2 JP5469305 B2 JP 5469305B2 JP 2007550217 A JP2007550217 A JP 2007550217A JP 2007550217 A JP2007550217 A JP 2007550217A JP 5469305 B2 JP5469305 B2 JP 5469305B2
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Description
したがって、具体的には、本発明の接合材を構成する接合材組成物としては、コージェライト、β-スポジュメン、非晶質シリカ、チタン酸アルミニウム、及びリン酸ジルコニウムからなる群から選択された少なくとも1種以上のフィラーと、炭化珪素、アルミナ、石英、窒化アルミニウム、B4C、ムライト、SiAlON、窒化珪素、ジルコニア、コージェライト、チタン酸アルミニウム、リン酸ジルコニウム、窒化ホウ素、タルク、マイカ、及びガラスフレークからなる群から選択された少なくとも1種以上のフィラーとの2種以上のフィラー、及びマトリックスを含むものであるか、あるいは、コージェライト、チタン酸アルミニウム、及びリン酸ジルコニウムからなる群から選択された少なくとも1種以上のフィラー、及びマトリックスを含むものであることが好ましい。
本発明のハニカム構造体1は、図1及び図2に示すように、多孔質の隔壁6によって区画、形成された流体の流路となる複数のセル5がハニカム構造体1の中心軸方向に互いに並行するように配設された構造を有し、それぞれが全体構造の一部を構成する形状を有するとともに、ハニカム構造体1の中心軸に対して垂直な方向に組み付けられることによって全体構造を構成することになる形状を有する複数のハニカムセグメント2が、本発明の接合材から形成された接合材層9によって一体的に接合されたハニカムセグメント接合体10として構成されてなるものである。
(ハニカムセグメントの作製)
ハニカムセグメント原料として、SiC粉末及び金属Si粉末を80:20の質量割合で混合し、これに造孔材、有機バインダー、界面活性剤及び水を添加して、可塑性の坏土を作製した。この坏土を押出成形し、乾燥して隔壁の厚さが310μm、セル密度が約46.5セル/cm2(300セル/平方インチ)、断面が一辺35mmの正四角形、長さが152mmのハニカムセグメント成形体を得た。このハニカムセグメント成形体を、端面が市松模様状を呈するように、セルの両端面を目封じした。すなわち、隣接するセルが、互いに反対側の端部で封じられるように目封じを行った。目封じ材としては、ハニカムセグメント原料と同様な材料を用いた。セルの両端面を目封じし、乾燥させた後、大気雰囲気中約400℃で脱脂し、その後、Ar不活性雰囲気、約1450℃で焼成して、SiC結晶粒子をSiで結合させた、多孔質構造を有するハニカムセグメントを得た。
表1に示す条件で、フィラーA及び/又はフィラーBを混合したものに、分散剤、発泡樹脂及び有機バインダー(CMC)を添加し、更にマトリックスとしてコロイダルシリカを混合し、ミキサーにて30分間混練を行い、種類及び組成比の異なるペースト状の接合材組成物(接合材組成物No.1〜13)をそれぞれ得た。尚、このときの接合材組成物中の全フィラーの割合は表1の「接合材組成物中のフィラー体積分率」欄のフィラーAとフィラーBの合計である。例えば、接合材組成物No.1の場合は、50%であり、また、接合材組成物中のマトリックスの割合は、表1の「接合材組成物中のフィラー体積分率」欄のフィラーAとフィラーBの合計を100から除したものである。例えば、接合材組成物No.1の場合は、50%である。また、表1の「その他」の欄、分散剤、発泡樹脂及び有機バインダーは、全フィラーおよびマトリックスの合計に対し、外配で添加した。
ハニカムセグメントの外壁面に、厚さ約1mmとなるように接合材組成物No.1をコーティングして接合材層を形成し、その上に別のハニカムセグメントを載置する工程を繰り返し、4×4に組み合わされた16個のハニカムセグメントからなるハニカムセグメント積層体を作製し、適宜、外部より圧力を加えるなどして、全体を接合させた後、140℃、2時間乾燥してハニカムセグメント接合体を得た。得られたハニカムセグメント接合体の外周を円筒状に切断後、その外周面をコーティング材で塗布し、700℃、2時間、乾燥硬化させ、ハニカム構造体を得た。
得られたハニカム構造体の中の接合材部分(硬化後の接合材組成物)のヤング率、平均熱膨張係数、気孔率は、ハニカム構造体の接合材部分を切断して所定の形状のサンプルを切り出し、JIS R1601に準じた3点曲げ試験における荷重-変位曲線よりヤング率を、JIS R1618に順じた平均線熱膨張係数を、アルキメデス法により気孔率をそれぞれ測定した。その結果を表2に示す。
得られたハニカム構造体の接合状態、急速加熱試験(バーナースポーリング試験B−sp)、急速冷却試験(電気炉スポーリング試験E−sp)及びエンジン試験(E/G試験)をそれぞれ行った。その結果を表2に示す。
接合・硬化後の接合部の状態を目視観察するとともに、接合強度を手の感触で観測した。尚、表2の表示では、○の場合、強固な接合状態でクラックや欠陥が無い状態であり、×の場合、簡単にはがれるあるいは外れる程度の接合状態、もしくはクラックや欠陥が多い状態を意味する。
ハニカム構造体にバーナーで加熱した空気を流すことにより中心部分と外側部分との温度差をつくり、ハニカム構造体のクラックの発生しない温度により耐熱衝撃性を評価する試験(温度が高いほど耐熱衝撃性が高い)である。尚、表2の表示では、○の場合、クラック発生なし、×の場合、クラック発生ありを意味する。
ハニカム構造体を電気炉にて550℃×2h加熱し、均一な温度(450℃)にした後、室温に取り出し、ハニカム構造体のクラック発生の有無により耐熱衝撃性を評価する試験である。尚、表2の表示では、○の場合、クラック発生なし、×の場合、クラック発生ありを意味する。
フィルター再生のために堆積したパーティキュレートを燃焼させ、ハニカム中心止部の温度が1000℃となる条件にて、ハニカム構造体のクラックの有無により耐熱衝撃性を評価する試験である。尚、表2の表示では、○の場合、クラック発生なし、×の場合、クラック発生ありを意味する。
参考例2〜11は、参考例1において、接合材を、表1に示す接合材組成物No.2〜11に変えたこと以外、参考例1と同様に、ハニカム構造体を作製した。また、比較例1及び比較例2は、接合材組成物No.12及びNo.13に変えたこと以外は参考例1と同様に、ハニカム構造体を作製した。それぞれ得られたハニカム構造体(参考例2〜11、比較例1及び比較例2)について、参考例1と同様の評価及び試験を行った。その結果を表2に示す。
表2の結果から、参考例1〜11は、接合材のヤング率が被接合物の20%以上、かつ、接合材の平均線熱膨張係数が被接合物の70%以下であるため、各種試験後、ハニカム構造体にクラックは見られなかった。
Claims (7)
- 25〜800℃における平均線熱膨張係数が被接合物の50%以下のフィラー(1)と、ヤング率が100GPa以上のフィラー(2)との2種以上のフィラー及びマトリックスから主に構成された接合材組成物によって形成され、
硬化後のヤング率が被接合物の20%以上であり、且つ硬化後の25〜800℃における平均線熱膨張係数が0.1×10−6〜2.0×10−6・K−1かつ被接合物の70%以下であるとともに、
前記被接合物の材料は、炭化珪素(SiC)、炭化珪素(SiC)を骨材としてかつ珪素(Si)を結合材として形成された珪素−炭化珪素系複合材料、珪素−炭化珪素複合材からなる群から選択される少なくとも一種から構成され、
前記フィラー(1)と前記フィラー(2)との総和の体積分率と前記マトリックスの体積分率とが等しく、
前記フィラー(1)と前記フィラー(2)との総和における体積分率がフィラー(1):フィラー(2)=50:50〜90:10であり、
前記フィラー(1)が、コージェライトであり、
前記フィラー(2)が、炭化珪素、窒化ホウ素、タルク、マイカ、及びガラスフレークからなる群から選択された少なくとも1種以上であり、かつ、板状粒子である窒化ホウ素、タルク、マイカ、およびガラスフレークからなる群から選ばれる少なくとも1種以上を含み、
前記マトリックスが、コロイダルシリカ、コロイダルアルミナ、エチルシリケート、水ガラス、シリカポリマー、リン酸アルミニウム、ベントナイトからなる群から選択された少なくとも1種以上である接合材。 - 前記フィラー(1)の25〜800℃における平均線熱膨張係数が、2.5×10−6・K−1以下である請求項1に記載の接合材。
- 前記マトリックスが、コロイダルシリカである請求項1または2に記載の接合材。
- ハニカムセグメントの接合に用いる請求項1〜3のいずれかに記載の接合材。
- 請求項1〜4のいずれかに記載の接合材を得るための接合材の製造方法であって、
前記フィラー(1)、前記フィラー(2)、及び前記マトリックスを混合し、混練を行うことにより、ペースト状の接合材組成物を得る工程を含む、接合材の製造方法。 - 請求項1〜4のいずれかに記載の接合材で、複数のセラミックス部材を接合して作製されたセラミックス構造体。
- 請求項1〜4のいずれかに記載の接合材で、複数のハニカムセグメントを接合して作製されたハニカム構造体。
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| PL2006264T3 (pl) | 2006-03-28 | 2013-09-30 | Ngk Insulators Ltd | Struktura typu plaster miodu oraz sposób jej wytwarzania |
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| JP6320798B2 (ja) | 2014-03-04 | 2018-05-09 | 日本碍子株式会社 | ハニカム構造体 |
| JP6231910B2 (ja) | 2014-03-14 | 2017-11-15 | 日本碍子株式会社 | 目封止ハニカム構造体 |
| JP6729143B2 (ja) * | 2015-10-29 | 2020-07-22 | 三菱マテリアル株式会社 | 樹脂組成物、接合体及び半導体装置 |
| CN108911717B (zh) * | 2018-08-20 | 2021-04-13 | 福建省德化县昱晟工艺品有限责任公司 | 一种具有良好抗热震性能的陶瓷制备方法 |
| CN109437876B (zh) * | 2018-09-25 | 2021-07-27 | 天津大学 | 一种陶瓷旋流片组分及其制备方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20080073792A (ko) | 2008-08-11 |
| WO2007069674A1 (ja) | 2007-06-21 |
| EP1964823A1 (en) | 2008-09-03 |
| JPWO2007069674A1 (ja) | 2009-05-28 |
| US20080248238A1 (en) | 2008-10-09 |
| US8039086B2 (en) | 2011-10-18 |
| EP1964823A4 (en) | 2010-08-04 |
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