JP6267690B2 - アルカリ土類炭酸塩を使用したチタン酸アルミニウムの収縮制御 - Google Patents
アルカリ土類炭酸塩を使用したチタン酸アルミニウムの収縮制御 Download PDFInfo
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Description
バッチ成分として添加されるアルカリ土類炭酸塩の収縮特徴と粒径特徴との間の関係を理解するために、約10.1マイクロメートルの中央粒径を有する粗い炭酸ストロンチウムおよび約5.3マイクロメートルの中央粒径を有する微細な炭酸ストロンチウムを含有するバッチから製造したサンプルについて、膨張率測定曲線を集めた。バッチの全ては、他の点では、原材料の無機成分の同じ組合せ、すなわち、アルミナ、チタニア、シリカ、炭酸ストロンチウム、炭酸カルシウム、および酸化ランタンを含有し、これらは、米国特許第7259120号明細書を参照して先に述べられた質量百分率の範囲内で加えられた。原材料の無機成分の各々は、バッチの各々において同じ質量百分率で加えられ、それらのバッチの各々は、同じ質量百分率で加えられた同じ結合剤(メチルセルロース)および同じ水分量を有した。ハニカム形状体(5.66インチの直径(約14.1cm)および8.5インチ(約21.6cm)長)への押出しおよび乾燥後、約1/4インチ(約0.64cm)×1/4インチ(約0.64cm)×1インチ(約2.54cm)の寸法を有するサンプルを未焼成体から切断した。次いで、それらのサンプルを空気中において室温から1420℃まで毎分1℃の速度で加熱することによって、膨張率測定試験を行った。膨張率測定実験の結果が、図1に示されており、約950℃と約1000℃の間の温度で粗い炭酸ストロンチウムと微細な炭酸ストロンチウムの使用の間に著しい差を示している。この温度では、炭酸ストロンチウムはSrOとCO2に分解している。粗い炭酸ストロンチウムは、ピンク色の曲線により示されるように、分解反応が比較的遅延し、成長が増加するようである。この温度では、物品は、非常に弱く、割れやすい。したがって、比較的微細な炭酸ストロンチウムを使用すると、焼成サイクルのこの段階で生じる寸法変化に関連する割れが減少するであろう。
Claims (1)
- チタン酸アルミニウム製ハニカムの収縮のばらつきを低減させる方法において、
チタン酸アルミニウム製ハニカムの焼結中に予測される収縮を決定する工程、
前記予測される収縮に基づいて、少なくとも1種類のアルカリ土類炭酸塩について粒径分布を選択する工程、
前記選択された粒径分布を有する前記少なくとも1種類のアルカリ土類炭酸塩を含む無機バッチ成分を含むチタン酸アルミニウム形成バッチ材料を調製する工程、
を有し、
前記粒径分布が第1の粒径分布と第2の粒径分布を含み、
(i)前記予測される収縮が所定の値を上回る場合、前記第1の粒径分布内に入る粒子の前記第2の粒径分布内に入る粒子に対する質量比が、前記予測される収縮が前記所定の値以下である場合よりも小さくなるように、前記少なくとも1種類のアルカリ土類炭酸塩の粒径分布を選択するか、あるいは、
(ii)前記予測される収縮が所定の値を下回る場合、前記第1の粒径分布内に入る粒子の前記第2の粒径分布内に入る粒子に対する重量比が、前記予測される収縮が前記所定の値以上である場合よりも大きくなるように、前記少なくとも1種類のアルカリ土類炭酸塩の粒径分布を選択する、
方法。
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US13/484,629 | 2012-05-31 | ||
US13/484,629 US9475734B2 (en) | 2012-05-31 | 2012-05-31 | Shrinkage control in aluminum titanate using carbonates |
PCT/US2013/043058 WO2013181221A1 (en) | 2012-05-31 | 2013-05-29 | Shrinkage control in aluminum titanate using alkaline earth carbonates |
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JP6267690B2 true JP6267690B2 (ja) | 2018-01-24 |
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EP (1) | EP2855397B1 (ja) |
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US9475734B2 (en) * | 2012-05-31 | 2016-10-25 | Corning Incorporated | Shrinkage control in aluminum titanate using carbonates |
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JPS5382822A (en) * | 1976-12-28 | 1978-07-21 | Ngk Insulators Ltd | Cordierite ceramics |
EP1235761A1 (en) * | 1999-10-05 | 2002-09-04 | Corning Incorporated | Method of making phosphate-based ceramic filters |
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EP2855397A1 (en) | 2015-04-08 |
JP2015525191A (ja) | 2015-09-03 |
CN104703946A (zh) | 2015-06-10 |
WO2013181221A1 (en) | 2013-12-05 |
US20130320600A1 (en) | 2013-12-05 |
EP2855397B1 (en) | 2021-08-04 |
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