JP2007533591A - チタン酸アルミニウムセラミックおよびその製造方法 - Google Patents
チタン酸アルミニウムセラミックおよびその製造方法 Download PDFInfo
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- JP2007533591A JP2007533591A JP2007509475A JP2007509475A JP2007533591A JP 2007533591 A JP2007533591 A JP 2007533591A JP 2007509475 A JP2007509475 A JP 2007509475A JP 2007509475 A JP2007509475 A JP 2007509475A JP 2007533591 A JP2007533591 A JP 2007533591A
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Abstract
Description
La2O3を含むことである。このような添加により、広範囲の焼成温度に亘って安定した特性を得ることもできる。
La2O3・4TiO2・6Al2O3)+k(LaAlO3)を含み、ここで、a,b,c,d,e,f,g,h,i.jおよびkは、(a+b+c+d+e+f+g+h+i+j+k=1.000)とする各構成要素の重量比率であり、かつ0.5≦a≦0.95,
0.0≦b≦0.5, 0.0≦c≦0.5, 0.0≦d≦0.5, 0.0≦e≦0.5, 0.0≦f≦0.25, 0.0≦g≦0.1, 0.0≦h≦0.03,i+j+k>0.001,b+c+d>0.001である。
Kronos 3200 であった。実施例2〜5においては、気孔形成剤は使用されていない。これらのバッチのためのバインダは A4M Methocel であった。滑剤としてオレイン酸が用いられ、溶媒は水であった。認識されるように、組成の大多数は30体積%を超える、中には40体積%を超える多孔度を示しており、1425℃で焼成されたものは、気孔形成剤を用いなくとも40%を超える多孔度を示している。これら組成物は、室温(RT)と1000℃の間で25×107/℃未満のCTEを示し、大多数の組成物は15×107/℃以下、中には10×107/℃以下のCTEを示し、或る実施例は5×107/℃未満のCTEを示している。実施例2〜5に関するMPSは10μm以上であり、或るものは15μm以上のMPSを示し、20μm以上を示すものさえある。優れたCTE,多孔度およびMPSは、1500℃未満あるいは1450℃よりも低い最高温度で焼成した間に得られる。いくつかの実施例は、室温(RT)と1000℃の間のCTEが10×107/℃以下であるのと組み合わせて、30体積%を超える多孔度を得ている。上記の実施例2〜5および下記の実施例6,7は、直径2.54cm(1インチ)、セル密度31セル/cm2(200/平方インチ)、壁厚406μm(0.016インチ)であった。
11 注入端
12 注入セル
14 排出セル
16,19 栓
17 排出端
20 ディーゼル微粒子フィルタ
Claims (22)
- チタン酸アルミニウム物品の製造方法であって、
(a)シリカ、アルミナおよびチタニアと、ストロンチウム、カルシウムおよびバリウムからなる群から選ばれた少なくとも一種類のアルカリ土類金属の原料とを含む無機原材料からなるバッチを形成し、
(b)該無機原材料からなるバッチに、酸化物基準で0.01〜10重量%の量の希土類金属酸化物を添加し、
(c)前記無機原材料からなるバッチと前記金属酸化物とを、可塑剤、滑剤、バインダ、気孔形成剤および溶媒からなる群から選ばれた加工助剤とともに混合し、
(d)該可塑化された混合物を整形して未焼成体にし、
(e)該未焼成体を1500℃未満の最高温度に加熱し、チタン酸アルミニウムからなる主相が形成されるのに十分な時間保持する、
諸ステップを含むことを特徴とする方法。 - 前記可塑化された混合物の整形ステップが、ダイを通す押出成形によって行なわれることを特徴とする請求項1記載の方法。
- 前記希土類金属酸化物が、イットリウム金属、ランタン金属からなる群、およびそれらの組合せから選ばれることを特徴とする請求項1記載の方法。
- 前記希土類金属酸化物がLa2O3であることを特徴とする請求項1記載の方法。
- 前記La2O3は、酸化物基準の重量%で表すとき、0.01%と2.0%との間の量が添加されることを特徴とする請求項4記載の方法。
- 前記未焼成体が、8時間未満の保持時間をもって焼成されることを特徴とする請求項1記載の方法。
- 前記希土類金属酸化物が、酸化物基準の重量%で表すとき、0.01%と2.0%との間の量が添加されることを特徴とする請求項1記載の方法。
- 前記最高温度が1400℃と1450℃の間の温度であることを特徴とする請求項1記載の方法。
- 前記最高温度が1450℃未満であることを特徴とする請求項1記載の方法。
- 前記保持時間が6時間と8時間の間の時間であることを特徴とする請求項1記載の方法。
- 前記無機原材料のバッチが、酸化物基準の重量%で表すとき、40〜65%のAl2O3,25〜40%のTiO2,3〜12%のSiO2、ならびに2〜10%の、SrO,CaO,BaOからなる群から選ばれた一種類のアルカリ土類金属酸化物およびそれらの組合せをさらに含むことを特徴とする請求項1記載の方法。
- チタン酸アルミニウムからなる主結晶相と、アルミニウム、チタン、珪素、アルカリ土類金属、および希土類金属とを包含する材料組成を含むことを特徴とするチタン酸アルミニウムセラミック物品。
- 前記アルカリ土類金属が、ストロンチウム、カルシウム、バリウムからなる群から選ばれた少なくとも一種類の金属およびこれらの組合せであり、前記希土類金属が、イットリウム、ランタンからなる群から選ばれた少なくとも一種類の金属およびこれらの組合せであることを特徴とする請求項12記載のチタン酸アルミニウムセラミック物品。
- 前記組成物が、酸化物基準の重量%で表すとき、a(Al2O3・TiO2)+b(
CaO・Al2O3・2SiO2)+c(SrO・Al2O3・2SiO2)+d(BaO・Al2O3・2SiO2)+e(3Al2O3・2SiO2)+f(Al2O3)+g(Si
O2)+h(Fe2O3・TiO2)+i(La2O3)+j(La2O3・4TiO2・6
Al2O3)+k(LaAlO3)を含み、
ここで、a,b,c,d,e,f,g,h,i.jおよびkは、(a+b+c+d+e+f+g+h+i+j+k=1.000)とする各構成要素の重量比率であり、かつ
0.5≦a≦0.95, 0.0≦b≦0.5, 0.0≦c≦0.5, 0.0≦d≦0.5, 0.0≦e≦0.5, 0.0≦f≦0.25, 0.0≦g≦0.1,
0.0≦h≦0.03, i+j+k>0.001, b+c+d>0.001
であることを特徴とする請求項13記載のセラミック物品。 - 前記組成物が、酸化物基準の重量%で表すとき、a(Al2O3・TiO2)+b(
CaO・Al2O3・2SiO2)+c(SrO・Al2O3・2SiO2)+d(BaO・Al2O3・2SiO2)+e(3Al2O3・2SiO2)+f(Al2O3)+g(Si
O2)+h(Fe2O3・TiO2)+i(La2O3)+j(La2O3・4TiO2・6Al2O3)+k(LaAlO3)をさらに含み、
ここで、a,b,c,d,e,f,g,h,i.jおよびkは、(a+b+c+d+e+f+g+h+i+j+k=1.00)とする各構成要素の重量比率であり、かつ
0.5≦a≦0.95, 0.0≦b≦0.5, 0.0≦c≦0.5, 0.0≦d≦0.5, 0.0≦e≦0.5, 0.0≦f≦0.25, 0.0≦g≦0.1,
0.0≦h≦0.005, i+j+k>0.001, b+c+d>0.01
であることを特徴とする請求項13記載のセラミック物品。 - 前記組成物が、酸化物基準の重量%で表すとき、40〜65%のAl2O3,25〜40%のTiO2,3〜12%のSiO2、ならびに2〜10%の、SrO,CaO,
BaOからなる群から選ばれた少なくとも一種類のアルカリ土類金属酸化物およびそれらの組合せと、0.01〜10%の、La2O3,Y2O3からなる群から選ばれた少なくとも一種類の希土類酸化物およびそれらの組合せとをさらに含むことを特徴とする請求項13記載のセラミック物品。 - 酸化物基準の重量%で表すとき、0.01%と0.35%との間のFe2O3をさらに含むことを特徴とする請求項16記載のセラミック物品。
- 酸化物基準の重量%で計算されるとき、6.0%以上のLa2O3をさらに含むことを特徴とする請求項16記載のセラミック物品。
- 酸化物基準の重量%で計算されるとき、45〜65%のAl2O3,28〜36%のTiO2,5〜12%のSiO2、3〜8%のSrO、0.1〜5%のCaO、および1〜9%のLa2O3をからなることを特徴とする請求項13記載のセラミック物品。
- 40体積%を超える多孔度を有することを特徴とする請求項12記載のセラミック物品。
- 気孔サイズの中央値が10μmを超えていることを特徴とする請求項12記載のセラミック物品。
- 室温〜1000℃間で測定した熱膨張係数が15×10−7/℃以下であることを特徴とする請求項12記載のセラミック物品。
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JP2008508185A (ja) * | 2004-07-29 | 2008-03-21 | コーニング インコーポレイテッド | 細孔サイズ分布の狭いチタン酸アルミニウム物体およびその製造方法 |
JP2009543755A (ja) * | 2006-07-14 | 2009-12-10 | コーニング インコーポレイテッド | チタン酸アルミニウムセラミック製ウォールフロー型フィルタの製造に用いられる施栓材料 |
JP2010111547A (ja) * | 2008-11-07 | 2010-05-20 | Sumitomo Chemical Co Ltd | チタン酸アルミニウム系多孔質焼成体の製造方法 |
DE102010008477A1 (de) | 2009-03-16 | 2010-09-23 | Ngk Insulators, Ltd., Nagoya | Verfahren zur Herstellung einer Aluminiumtitanatkeramik |
JP2011516371A (ja) * | 2008-02-29 | 2011-05-26 | コーニング インコーポレイテッド | 異方性多孔質セラミック物品およびその製造 |
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EP1737554A2 (en) | 2007-01-03 |
JP5734335B2 (ja) | 2015-06-17 |
US20060281627A1 (en) | 2006-12-14 |
JP2013199424A (ja) | 2013-10-03 |
CN100512919C (zh) | 2009-07-15 |
PL1737554T3 (pl) | 2015-03-31 |
EP1737554A4 (en) | 2008-05-07 |
KR20070012506A (ko) | 2007-01-25 |
US7259120B2 (en) | 2007-08-21 |
WO2006028506A2 (en) | 2006-03-16 |
WO2006028506A3 (en) | 2006-10-12 |
EP1737554B1 (en) | 2014-10-29 |
KR101192916B1 (ko) | 2012-10-18 |
CN1942228A (zh) | 2007-04-04 |
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