JP5224291B2 - 細孔形成剤とチタン酸アルミニウムセラミック形成バッチ材料を含有する未焼成体の焼成方法 - Google Patents
細孔形成剤とチタン酸アルミニウムセラミック形成バッチ材料を含有する未焼成体の焼成方法 Download PDFInfo
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Description
上式中、
Tbは加熱サイクルのその段階の始まりの初期炉温度であり、
Teは加熱サイクルのその段階の終了時の炉温度であり、
tbは加熱サイクルのその段階の開始時の時間であり、
teは加熱サイクルのその段階の終了時の時間である。
その一次結晶相としてチタン酸アルミニウムを有するセラミック物品の形成のために適した無機粉末バッチ混合物は、実施例A〜Hとして表IIに記載される。実施例の組成A〜Hの各々は、表IIに記載された明示された無機混合物の無機成分を配合し一緒にドライブレンドすることによって調製された。これらの混合物に表Iに明示された細孔形成剤の組合せの量を添加した。さらに、表IIに記載された有機結合剤系を各々に添加し、この中間混合物をその後、溶剤として脱イオン水とさらに混合して可塑化セラミックバッチ混合物を形成した。以下の表IおよびIIに示された結合剤系成分および細孔形成剤の組合せは、全無機物の100%に基づいて重量%で記載される。
Claims (23)
- チタン酸アルミニウム形成無機バッチ材料と、(i)第1の細孔形成剤および(ii)前記第1の細孔形成剤と異なる組成を有する第2の細孔形成剤を含む細孔形成剤の組合せとを含有する未焼成体を提供する工程と、
第1の加熱段階において、室温〜500℃の間で14℃/時間より大きく50℃/時間より小さい第1の平均上昇速度で、40時間未満にわたり加熱する工程と、
前記第1の段階の後、第2の加熱段階において、500℃より高い下限および900℃未満の上限を有する第1の保持温度領域内に40時間未満にわたり炉温度を保持する工程と、
前記第2の加熱段階の後、第3の加熱段階において、30℃/時間より大きく80℃/時間より小さい第2の平均上昇速度で炉温度を上昇させる工程と、
第4の加熱段階において、前記未焼成体をセラミックに転化するのに十分な時間にわたり、1350℃より高い下限および1550℃未満の上限を有する第2の保持温度領域内に炉温度を保持する工程と、
を含むことを特徴とする、未焼成体を焼成する方法。 - 前記第4の加熱段階の後、100℃/時間より大きい平均冷却速度で、前記下限から1000℃未満まで冷却する工程をさらに含むことを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階において、室温〜500℃の間で加熱する時間が、30時間未満であることを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階において室温〜500℃の間で加熱する時間が、20時間未満であることを特徴とする、請求項3記載の方法。
- 前記第1の加熱段階において、300℃〜500℃の温度範囲内で、加熱速度が10℃/時間より大きいことを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階において、300℃〜500℃の温度範囲内で、加熱速度が25℃/時間より大きいことを特徴とする、請求項5記載の方法。
- 前記第1の加熱段階において、300℃〜500℃の温度範囲内で、加熱速度が50℃/時間より大きいことを特徴とする、請求項5記載の方法。
- 前記第1の加熱段階において、300℃〜500℃の温度範囲内で、加熱速度が75℃/時間より大きいことを特徴とする、請求項5記載の方法。
- 前記第2の加熱段階における平均上昇速度が、10℃/時間より大きいことを特徴とする、請求項1記載の方法。
- 前記第2の加熱段階において、前記炉温度を保持する時間が30時間未満であることを特徴とする、請求項1記載の方法。
- 前記第2の加熱段階において、前記炉温度を保持する時間が20時間未満であることを特徴とする、請求項10記載の方法。
- 前記第2の加熱段階において、前記炉温度を保持する時間が20時間未満であり、前記第1の保持温度領域が、600℃より高い下限および800℃未満の上限を有することを特徴とする、請求項1記載の方法。
- 前記第3の加熱段階が、40℃/時間より大きく60℃/時間より小さい第2の平均上昇速度を有することを特徴とする、請求項1記載の方法。
- 前記第3の加熱段階が、40℃/時間より大きく50℃/時間より小さい第2の平均上昇速度を有することを特徴とする、請求項13記載の方法。
- 前記第4の加熱段階において前記炉温度を保持する時間が、少なくとも10時間であることを特徴とする、請求項1記載の方法。
- 前記第4の加熱段階において前記炉温度を1420℃より高い下限および1460℃未満の上限を有する第2の保持温度領域内に保持する時間が、少なくとも15時間であることを特徴とする、請求項1記載の方法。
- 前記第1の平均上昇速度が、第1の保持温度領域内での前記第2の加熱段階の平均加熱速度より大きいことを特徴とする、請求項1記載の方法。
- 前記第3の加熱段階における第2の平均上昇速度が、前記第2の加熱段階の平均加熱速度より大きいことを特徴とする、請求項1記載の方法。
- 前記第4の加熱段階において炉温度を保持する工程が、1350℃より高く1550℃未満の前記第2の保持温度領域内に少なくとも10時間にわたり炉温度を維持する工程を含むことを特徴とする、請求項1記載の方法。
- 前記セラミック物品が、チタン酸アルミニウムの主相を有するように形成されることを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階の開始から80時間未満で、炉内の酸素濃度を15%超まで上昇させる工程をさらに含むことを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階の開始から40時間未満で、炉内の酸素濃度を15%超まで上昇させる工程をさらに含むことを特徴とする、請求項1記載の方法。
- 前記第1の加熱段階の開始から30時間未満で、炉内の酸素濃度を15%超まで上昇させる工程をさらに含むことを特徴とする、請求項1記載の方法。
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- 2006-05-31 EP EP06784527A patent/EP1890983B1/en active Active
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Publication number | Publication date |
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JP2008545612A (ja) | 2008-12-18 |
CN101213156B (zh) | 2014-07-16 |
WO2006130759A2 (en) | 2006-12-07 |
JP2009227580A (ja) | 2009-10-08 |
WO2006130759A3 (en) | 2007-02-15 |
US20070006561A1 (en) | 2007-01-11 |
JP5366661B2 (ja) | 2013-12-11 |
EP1890983A2 (en) | 2008-02-27 |
CN101213156A (zh) | 2008-07-02 |
US7976768B2 (en) | 2011-07-12 |
EP1890983B1 (en) | 2012-12-12 |
US20110195838A1 (en) | 2011-08-11 |
JP2009190968A (ja) | 2009-08-27 |
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