JP2010089981A - チタン酸アルミニウム系セラミックス粉末の製造方法 - Google Patents
チタン酸アルミニウム系セラミックス粉末の製造方法 Download PDFInfo
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Abstract
【解決手段】チタニア源粉末、アルミナ源粉末およびシリカ源粉末を含む前駆体混合物を、1100℃〜1350℃の温度範囲で3時間以上保持する工程と、1400℃以上の温度に昇温し同温度で焼成を行ない、チタン酸アルミニウム系セラミックス体を得る工程と、チタン酸アルミニウム系セラミックス体を粉砕および分級する工程とを含み、該粉砕および分級する工程は、チタン酸アルミニウム系セラミックス体を粉砕した後、該粉砕物を分級することにより、所定粒度以下の粉末を得る工程(A)と、該粉砕物の残りを再度粉砕した後、該粉砕物を分級することにより、所定粒度以下の粉末を得る工程(B)とを備える、チタン酸アルミニウム系セラミックス粉末の製造方法である。
【選択図】なし
Description
(1)チタニア源粉末、アルミナ源粉末およびシリカ源粉末を含む前駆体混合物を、1100℃〜1350℃の温度範囲で3時間以上保持する工程(保持工程)。
(2)1400℃以上の温度に昇温し、同温度で焼成を行なうことにより、チタン酸アルミニウム系セラミックス体を得る工程(焼成工程)。
(3)チタン酸アルミニウム系セラミックス体を粉砕および分級する工程(粉砕・分級工程)。
本工程では、チタニア源粉末、アルミナ源粉末およびシリカ源粉末を混合し、これら原料粉末を含む前駆体混合物を調製した後、当該前駆体混合物を1100℃〜1350℃の温度範囲で3時間以上保持する。この前駆体混合物は、焼成されることによりチタン酸アルミニウム系セラミックスに導かれるものである。
本工程において、上記保持工程を経た前駆体混合物を、1400℃以上、通常は1500℃未満の温度に昇温し、同温度で焼成することにより、チタン酸アルミニウム系セラミックス体を得る。焼成は、通常、上記保持工程に引き続き上記焼成温度に昇温することにより行なわれ、上記保持工程と同様の雰囲気中で、同様の加熱炉を用いて行なわれる。
本工程において、上記チタン酸アルミニウム系セラミックス体を粉砕および分級し、チタン酸アルミニウム系セラミックス粉末を得る。本発明の製造方法において、粉砕・分級工程は、以下の工程を備える。
(A)チタン酸アルミニウム系セラミックス体に衝撃を加えて粉砕した後、得られた粉砕物を分級することにより、所定粒度以下のチタン酸アルミニウム系セラミックス粉末を得る工程、および、
(B)該粉砕物の残りに衝撃を加えて再度粉砕した後、得られた粉砕物を分級することにより、所定粒度以下のチタン酸アルミニウム系セラミックス粉末を得る工程。
酸化チタン(IV)粉末〔デュポン(株)、「R−900」〕38.1質量部、αアルミナ粉末〔住友化学(株)製、「AES−12」〕52.5質量部、マグネシアスピネル粉末5.7質量部、長石粉末〔福島長石、SiO2換算のシリコン含有量は72質量%、Al2O3換算のアルミニウム含有量は15質量%〕3.7質量部を混合し、前駆体混合物を得た。
1100〜1300℃での保持時間を6.7時間としたこと以外は、実施例1と同様にして、チタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
粉砕用回転体の回転数を6800rpmとしたこと以外は、実施例2と同様にして、チタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
まず、実施例2と同様にして、チタン酸アルミニウムマグネシウム体を得た。次に、このチタン酸アルミニウムマグネシウム体を、石臼ミル〔中央化工機商事(株)製のプレマックス PR−200V〕を用いて、歯隙間90μm、回転数2000rpmの条件で、粉砕することによりチタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
まず、実施例1で用いたものと同じ前駆体混合物をアルミナルツボに入れ、大気中、300℃/時間の速度で昇温し、1100〜1300℃で2時間保持した後、さらに昇温速度300℃/時間で1450℃まで昇温し、同温度で4時間保持することにより焼成して、チタン酸アルミニウムマグネシウム体を得た。
分級用回転体の回転数を500rpmとしたこと以外は、比較例2と同様にして、チタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
粉砕用回転体の回転数を4000rpmとしたこと以外は、比較例2と同様にして、チタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
粉砕用回転体の回転数を3000rpmとしたこと以外は、比較例2と同様にして、チタン酸アルミニウムマグネシウム粉末を得た。得られたチタン酸アルミニウムマグネシウム粉末の粒径特性を表1に示す。
Claims (4)
- チタニア源粉末、アルミナ源粉末およびシリカ源粉末を含む前駆体混合物を、1100℃〜1350℃の温度範囲で3時間以上保持する工程と、
1400℃以上の温度に昇温し、同温度で焼成を行なうことにより、チタン酸アルミニウム系セラミックス体を得る工程と、
前記チタン酸アルミニウム系セラミックス体を粉砕および分級する工程とを含み、
ここで、前記チタン酸アルミニウム系セラミックス体を粉砕および分級する工程は、
前記チタン酸アルミニウム系セラミックス体に衝撃を加えて粉砕した後、得られた粉砕物を分級することにより、所定粒度以下のチタン酸アルミニウム系セラミックス粉末を得る工程(A)と、
前記粉砕物の残りに衝撃を加えて再度粉砕した後、得られた粉砕物を分級することにより、所定粒度以下のチタン酸アルミニウム系セラミックス粉末を得る工程(B)と、
を備える、チタン酸アルミニウム系セラミックス粉末の製造方法。 - 前記工程(B)が2回以上繰り返される請求項1に記載のチタン酸アルミニウム系セラミックス粉末の製造方法。
- 前記所定粒度以下のチタン酸アルミニウム系セラミックス粉末は、最大粒径が110μm以下のチタン酸アルミニウム系セラミックス粉末である請求項1または2に記載のチタン酸アルミニウム系セラミックス粉末の製造方法。
- 前記前駆体混合物は、マグネシア源粉末をさらに含む請求項1〜3のいずれかに記載のチタン酸アルミニウム系セラミックス粉末の製造方法。
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PCT/JP2009/067388 WO2010041648A1 (ja) | 2008-10-07 | 2009-10-06 | チタン酸アルミニウム系セラミックス粉末の製造方法 |
CN2009801397449A CN102177096A (zh) | 2008-10-07 | 2009-10-06 | 钛酸铝系陶瓷粉末的制造方法 |
PL09819182T PL2336087T3 (pl) | 2008-10-07 | 2009-10-06 | Sposób wytwarzania proszku ceramiki na bazie tytanianu glinu |
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EP09819182.8A EP2336087B1 (en) | 2008-10-07 | 2009-10-06 | Process for producing a powder of aluminum titanate-based ceramics |
US13/119,661 US8920705B2 (en) | 2008-10-07 | 2009-10-06 | Process for producing a powder of aluminum titanate-based ceramics |
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