JP2008538096A - 耐腐食性セラミック材料及びこれを用いたフィルター、並びにその製造方法 - Google Patents
耐腐食性セラミック材料及びこれを用いたフィルター、並びにその製造方法 Download PDFInfo
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Abstract
本発明に従って製造された、上記の構造的、熱的そして化学的に安定性の高いセラミック材料を、自動車の排気ガス浄化触媒用多孔性ハニカム支持体、又は、ディーゼルエンジンの排気ガス浄化用フィルター(DPF、Diesel Particulate Filter)に適用することにより、コーディエライトを構造体の材料として用いる時にもたされる、腐食性ガスによる構造の破壊を防止するか、或いは顕著に低減することができる。
Description
このように、本発明に従って製造されたセラミック複合体においては、構成成分の全てが一度に単一相を形成するというよりは、2つの成分或いは3つの成分が化学的に安定した相(phase)を形成し、それらが互いに結合して、原子単位の微小粒子(grain)を形成している。その後、それらの原子単位の小さくて安定した微小粒子が複合的に結合することで、より複雑でかつ多様な複合粒子を形成し、これらの粒子が、熱的、機械的、そして化学的に安定した全体的な複合体を構成するようになる。
まず、 TiO2とZrO2を1:1の比率(TiとZrの原子比)となるように秤量して、ミキサーに仕込み、エタノールを混合溶液として用い、6時間以上混合を行った。混合された粉末は、10時間乾燥した後、1100℃で、不純物を除去するために酸化工程を行った。このようにして製造された粉末をミキサーに仕込み、エタノールを混合溶液として用い、バインダとしてPVA(Polyvinyl alcohol)を5%加え、6時間の間混合を行った。混合された粉末をモールドに入れて成形し、ディスク状に製造した。製造されたディスクを1300〜1500℃で、2時間熱処理を行い、TiZrO4相を合成した。XRDで分析した結果、うまく合成されたTiO2−ZrO2の結晶構造が観察された。
まず、実施例4の過程を経てTiZr−Si(10)の相合成を行った。結果として得られたTiZr−Si(10)粉末とアルミナ(Al2O3)粉末を、それぞれの量を適正して、実施例4の方法と同様に、混合→乾燥→酸化→混合(バインダ添加)→成形→熱処理の過程を経て、TiZr−Si(10)−Al(5)(TiZrO4に、10重量%のシリカ、5重量%のアルミナが含まれた合成セラミック)、TiZr−Si(10)−Al(10)(TiZrO4に、10重量%のシリカ、10重量%のアルミナが含まれた合成セラミック)を合成した。XRD(X−ray diffraction)で分析したところ、TiO2−ZrO2、TiO2−Al2O3、ムライト(3Al2O3−2SiO2)、Al2TiO5の構造が確認された。
表1から、合成セラミックの破壊応力は、TiZr−Si(10)−Al(5)は5.4Mpaであり、TiZr−Si(10)−Al(10)は5.8Mpaであると測定されたが、これは、TiZr−Si(10)の破壊応力1.4Mpaに比して顕著に増加された数値であり、熱伝導度もまた向上した数値を示していることが分かる。
本発明において明示しているとおり、本発明の開示に従って、材料の含量を変化させたり、或いは新しい金属酸化物を添加したり、又はそれらを組み合わせることによって、新しい排気ガス浄化用フィルターを首尾よく製造することができ、これを利用すると、物理的、熱的には勿論のこと、化学的にも安定した合成セラミックを製造することができる。
Claims (18)
- Siの酸化物(SiO2)、Alの酸化物(Al2O3)、及び遷移金属酸化物MxOy[ここで、Mは、Ti、Zr、Hf、V、Nb、Ta、Cr、Mo、W、又はCeから選ばれる4B、5B又は6B族遷移金属を示し、x及びyは、それぞれ、1〜3の整数を示す。]で構成された群より選ばれる3つ以上の酸化物を含む、耐熱性、及び、酸と塩基に対する耐性に優れた多孔性セラミック材料。
- 前記セラミック材料が、(第1成分)−(第2成分)−(第3成分)として、SiO2−Al2O3−MxOy[ここで、Mは、Ti、Zr、Hf、V、Nb、Ta、Cr、Mo、W、又はCeから選ばれる4B、5B又は6B族遷移金属を示し、x及びyは、それぞれ、1〜3の整数を示す。]を(5−60):(5−60):(5−60)の重量比で含むことを特徴とする請求項1に記載の多孔性セラミック材料。
- 前記重量比が、(10−50):(10−50):(10−50)であることを特徴とする請求項2に記載の多孔性セラミック材料。
- 前記重量比が、(10−30):(30−60):(5−60)であることを特徴とする請求項3に記載の多孔性セラミック材料。
- 前記第1成分のシリカ(SiO2)及び前記第2成分のアルミナ(Al2O3)が、ムライト(3Al2O3−2 SiO2)の構造を有していることを特徴とする請求項2に記載の多孔性セラミック材料。
- 前記ムライト(3Al2O3−2 SiO2)と前記第3成分の遷移金属酸化物(MxOy)は、(60−95):(5−40)の重量比で存在することを特徴とする請求項5に記載の多孔性セラミック材料。
- 前記セラミック材料が、(第1成分)−(第2成分)−(第3成分)として、TiO2−ZrO2−MxOy[ここで、Mは、Hf、V、Nb、Ta、Cr、Mo、W、又はCeから選ばれる4B、5B又は6B族遷移金属、あるいはSi,Alを示し、x及びyは、それぞれ、1〜3の整数を示す。]を(5−60):(5−60):(5−60)の重量比で含むことを特徴とする請求項1に記載の多孔性セラミック材料。
- 前記セラミック材料が、(第1成分)−(第2成分)−(第3成分)として、TiO2−ZrO2−WO3、 TiO2−ZrO2− Al2O3、 又は、TiO2−ZrO2−SiO2の複合酸化物を含むことを特徴とする請求項7に記載の多孔性セラミック材料。
- 前記重量比が、(10−50):(10−50):(10−50)であることを特徴とする請求項7に記載の多孔性セラミック材料。
- 前記第1成分のチタニア(TiO2)及び前記第2成分のジルコニア(ZrO2)が、チタニア−ジルコニア(TiZrO4)の構造を有することを特徴とする請求項7に記載の多孔性セラミック材料。
- 前記チタニア−ジルコニア(TiZrO4)の構造と前記第3成分の遷移金属酸化物(MxOy)は、(60−95):(5−40)の重量比で存在することを特徴とする請求項10に記載の多孔性セラミック材料。
- 前記セラミック材料は、更に、Si、Al、又は4B、5B若しくは6B族遷移金属酸化物の内から、第1成分、第2成分、及び第3成分とは異なる酸化物を第4成分として含むことを特徴とする請求項1又は7に記載の多孔性セラミック材料。
- 前記セラミック材料が、(第1成分)−(第2成分)−(第3成分)−(第4成分)として、TiO2−ZrO2−SiO2−MxOy[ここで、Mは、Hf、V、Nb、Ta、Cr、Mo、W、又はCeから選ばれる4B、5B、6B族遷移金属、あるいはAlを示し、x及びyは、それぞれ、1〜3の整数を示す。]を(5−60):(5−60):(5−60):(5−60)の重量比で含むことを特徴とする請求項12に記載の多孔性セラミック材料。
- 前記セラミック材料が、(第1成分)−(第2成分)−(第3成分)−(第4成分)として、TiO2−ZrO2−SiO2−Al2O3を含み、該構造が、チタニア−ジルコニア複合酸化物(TiZrO4)構造、及びムライト(3Al2O3−2SiO2)構造となっていることを特徴とする請求項13に記載の多孔性セラミック材料。
- 請求項1に記載の、耐熱性、及び、酸と塩基に対する耐性に優れた多孔性セラミック材料を含有することを特徴とする多孔性ハニカム。
- 請求項1に記載の、耐熱性、及び、酸と塩基に対する耐性に優れた多孔性セラミック材料を含有することを特徴とするディーゼルエンジンの排気ガス浄化用フィルター。
- 請求項1に記載の、耐熱性、及び、酸と塩基に対する耐性に優れた多孔性セラミック材料に、白金、パラジウム又はロジウムのような触媒物質を含む多孔性担体粉末のウォッシュコーティングを行って製造される排気ガス浄化用システム。
- 請求項1に記載の、耐熱性、及び、酸と塩基に対する耐性に優れた多孔性セラミック材料に、白金、パラジウム又はロジウムのような触媒物質を担持して製造される排気ガス浄化用システム。
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JP2008047265A (ja) | 2006-08-21 | 2008-02-28 | Nippon Densan Corp | チャッキング装置、このチャッキング装置を搭載したモータおよびディスク駆動装置 |
JP4618214B2 (ja) | 2006-08-21 | 2011-01-26 | 日本電産株式会社 | チャッキング装置、このチャッキング装置を搭載したモータおよびディスク駆動装置 |
FR2907444B1 (fr) * | 2006-10-20 | 2008-12-19 | Rhodia Recherches & Tech | Composition a acidite elevee a base d'oxydes de zirconium,de silicium et d'au moins un autre element choisi parmi le titane,l'aluminium,le tungstene,le molybdene,le cerium,le fer et le manganese |
FR2907445B1 (fr) | 2006-10-20 | 2010-09-03 | Rhodia Recherches & Tech | Composition a acidite elevee a base d'oxyde de zirconium, d'oxyde de titane et d'oxyde de tungstene,procede de preparation et utilisation dans le traitement des gaz d'echappement |
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CN101186490B (zh) * | 2007-12-07 | 2010-10-06 | 煤炭科学研究总院重庆研究院 | 多孔惰性材料及其在热导元件上的应用 |
KR100909989B1 (ko) | 2007-12-20 | 2009-07-29 | 희성촉매 주식회사 | 디젤 또는 린번 엔진 배기가스 질소산화물 제거용DeNOx 복합촉매 |
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US20090270252A1 (en) | 2009-10-29 |
US8012904B2 (en) | 2011-09-06 |
CN101921133A (zh) | 2010-12-22 |
WO2006095992A1 (en) | 2006-09-14 |
CN101137597A (zh) | 2008-03-05 |
EP1858824A1 (en) | 2007-11-28 |
KR20060097611A (ko) | 2006-09-14 |
KR100752520B1 (ko) | 2007-08-29 |
EP1858824A4 (en) | 2012-05-09 |
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