JP2010132527A - チタン酸アルミニウム系セラミックスの製造方法 - Google Patents
チタン酸アルミニウム系セラミックスの製造方法 Download PDFInfo
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- JP2010132527A JP2010132527A JP2009147921A JP2009147921A JP2010132527A JP 2010132527 A JP2010132527 A JP 2010132527A JP 2009147921 A JP2009147921 A JP 2009147921A JP 2009147921 A JP2009147921 A JP 2009147921A JP 2010132527 A JP2010132527 A JP 2010132527A
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Abstract
【解決手段】チタニウム源粉末、アルミニウム源粉末およびケイ素源粉末を含む原材料混合物を焼成するチタン酸アルミニウム系セラミックスの製造方法であって、前記ケイ素源粉末の体積基準での累積百分率50%相当粒子径(D50)が5μm以下であることを特徴とするチタン酸アルミニウム系セラミックスの製造方法。また、前記原材料混合物が、さらにマグネシウム源粉末を含むチタン酸アルミニウム系セラミックスの製造方法。
【選択図】図1
Description
前記ケイ素源粉末の体積基準での累積百分率50%相当粒子径(D50)が5μm以下であることを特徴とするチタン酸アルミニウム系セラミックスの製造方法である。
チタニウム源粉末の使用量およびアルミナ(Al2O3)換算のアルミニウム源粉末の使用量の合計量100質量部に対して、チタニア換算のチタニウム源粉末の使用量は30〜70質量部であり、アルミナ換算のアルミニウム源粉末の使用量は30質量部〜70質量部であり、かつ、シリカ(SiO2)換算のケイ素源粉末の使用量は、0.1質量部〜20質量部であることが好ましい。また、原材料混合物にマグネシウム源粉末が含まれる場合は、チタニア(TiO2)換算のチタニウム源粉末の使用量とアルミナ(Al2O3)換算のアルミニウム源粉末の使用量との合計量100質量部に対して、マグネシア(MgO)換算のマグネシウム源粉末の使用量は0.1質量部〜10質量部であることが好ましい。
本発明で用いられる原材料混合物は、原材料粉末であるチタニウム源粉末、アルミニウム源粉末およびケイ素源粉末を含む混合物であり、さらにマグネシウム源粉末を含むことが好ましい。なお、本発明では、前記マグネシアスピネル(MgAl2O4)などの複合酸化物のように、チタニウム源化合物、アルミニウム源化合物およびマグネシウム源化合物のうち2つ以上の金属元素を成分とする化合物の粉末を含む混合物も、それぞれの金属源粉末を混合した原材料混合物に含まれるものとする。また、原材料混合物にはチタン酸アルミニウムやチタン酸アルミニウムマグネシウム自体が含まれていてもよく、例えば、原材料混合物としてチタン酸アルミニウムマグネシウムを使用する場合、チタニウム源化合物、アルミニウム源化合物およびマグネシウム源化合物を兼ね備えた原材料混合物に相当するものとする。
本発明に用いられるチタニウム源粉末は、チタンを含有し焼成によりチタン酸アルミニウム系セラミックスを合成できる粉末であれば特に限定されないが、好ましくは酸化チタンの粉末である。酸化チタンとしては、例えば、酸化チタン(IV)、酸化チタン(III)、酸化チタン(II)などが挙げられ、酸化チタン(IV)が好ましく用いられる。酸化チタン(IV)の結晶型としては、アナターゼ型、ルチル型、ブルッカイト型などが挙げられ、アモルファスであってもよく、より好ましくはアナターゼ型、ルチル型である。
本発明で用いられるアルミニウム源粉末は、アルミニウムを含有し焼成によりチタン酸アルミニウム系セラミックスを合成できる粉末であれば特に限定されないが、好ましくはアルミナである。アルミナの結晶型としては、γ型、δ型、θ型、α型などが挙げられ、アモルファスであってもよいが、好ましくはα型である。
本発明で用いられるケイ素源粉末は、ケイ素元素を含有し焼成によりチタン酸アルミニウム系セラミックスを合成できる粉末であれば特に限定されないが、好ましくは酸化ケイ素の粉末である。酸化ケイ素としては、二酸化ケイ素、一酸化ケイ素などが挙げられる。
ていることが好ましく、添加量は0.1wt%以上、10wt%以下であることが好ましい。また、使用するガラスフリットは、得られるチタン酸アルミニウム系セラミックスの耐熱分解性を向上させるという観点から、屈伏点が700℃以上のものを用いることが好ましい。
本発明で用いられるマグネシウム源粉末は、マグネシウムを含有し焼成によりチタン酸アルミニウム系セラミックスを合成できる粉末であれば特に限定されないが、例えば、マグネシア(酸化マグネシウム)、単独で空気中で焼成することによりマグネシアに導かれる化合物を含む粉末が挙げられ、好ましくはマグネシアである。
原材料混合物中に含まれるチタニア(TiO2)換算のチタニウム源粉末の使用量およびアルミナ(Al2O3)換算のアルミニウム源粉末の使用量の合計量100質量部あたり、チタニア換算のチタニウム源粉末の使用量は、通常、30〜70質量部であり、好ましくは40〜60質量部である。また、アルミナ換算のアルミニウム源粉末の使用量は、通常、30質量部〜70質量部であり、好ましくは40質量部〜60質量部である。
本発明の製造方法においては、通常、上記各原材料粉末を混合することで原材料混合物を得ることができる。混合方法は、乾式雰囲気にて混合を行なう方法(乾式混合法)、湿式雰囲気で混合を行なう方法(湿式混合法)のいずれを用いてもよい。また、これらの原材料混合物には微粒チタン酸アルミニウム等が含まれていてもよい。
乾式雰囲気で混合する場合は、例えば、上記の各原材料粉末を混合し、液体媒体中に分散させること無く、粉砕容器内で撹拌すればよく、粉砕メディアの共存下に粉砕容器内で撹拌することによって原材料粉末の粉砕を同時に行なってもよい。
原材料粉末を乾式にて粉砕するにあたっては、粉砕助剤、解膠剤などの添加剤を加えてもよい。
湿式雰囲気で混合する場合は、例えば、ケイ素源粉末等の原材料粉末を溶媒中に分散させた状態で他の原材料粉末と混合すればよく、通常はケイ素源粉末が溶媒に分散された状態で他の原材料粉末と混合される。その際、溶媒として、通常は水が用いられ、不純物が少ない点で、イオン交換水が好適に用いられる。溶媒の使用量は、原材料粉末の合計量100質量部に対して、通常、20質量部〜1000質量部であり、好ましくは30質量部〜300質量部である。
本発明の製造方法においては、上述のようにして得られた粉末状の原材料混合物に対して、粉末状のままで焼成を行なってから成形体としてもよく、原材料混合物を成形した後に焼成を行なってもよい。また、粉末状の原材料混合物を焼成した後に成形体を得て、さらに該成形体を焼成してもよい。
原材料混合物の焼成前または焼成後の成形には、通常用いられる成形方法を用いることができ、一軸成形や押し出し成形などが用いられる。成形に用いる成形機としては、一軸プレス、押出成形機、打錠機造粒機などが挙げられる。
チタン酸アルミニウムのチタン酸アルミニウム化率(AT化率)は、粉末X線回折スペクトルにおける2θ=27.4°の位置に現れるピーク(チタニア・ルチル相(110)面)の積分強度(IT)と、2θ=33.7°の位置に現れるピーク(チタン酸アルミニウム相(230)面またはチタン酸アルミニウムマグネシウム相(230)面)の積分強度(IAT)とから、式(1)
(熱膨張係数の測定)
チタン酸アルミニウム系セラミックスの成形焼成体の熱膨張係数の値は、各実施例、比較例において解砕される前の成形焼成体から検体を切り出した後、200℃/hで600℃まで昇温し熱処理をしたのち、熱機械的分析装置(TMA (SIIテクノロジー(株)社製 TMA6300)を用いて、室温から1000℃まで600℃/hで昇温させた際の膨張率で、熱膨張係数(K-1)を測定した。
二次粒子径は、レーザー回折式粒度分布測定装置(日機装社製「Microtrac HRA(X−100)」)により、体積基準での累積百分率50%相当粒子径(D50)および90%相当粒子径(D90)として算出した。
ガラスフリット(タカラスタンダード(株)製、型番「CK−0832M2」)5000gをアルミナビーズ(直径15mm)80kgと共にアルミナ製粉砕容器(内容積50L)に投入した。その後、粉砕容器を振動ミルにより振幅10mm、振動数1200回/分、動力5.5kWにて30分間振動させることにより粉砕容器内のガラスフリットを粉砕し、ケイ素源粉末を得た。粉砕後のガラスフリットのD50は3.6μm、D90は14.6μmであった。
原材料混合物の焼成温度を1500℃とした(昇温速度300℃/時間で1500℃まで昇温し、同温度を4時間保持した)以外は、実施例1と同様にして、チタン酸アルミニウム系セラミックスの成形焼成体および粉末を得た。
ケイ素源粉末の調製において、ガラスフリット(タカラスタンダード(株)製、型番「CK−0832M2」)の振動ミルによる粉砕時間(振動時間)を60分間とした以外は、実施例1と同様にして、チタン酸アルミニウム系セラミックスの成形焼成体および粉末を得た。
原材料混合物の焼成温度を1500℃とした(昇温速度300℃/時間で1500℃まで昇温し、同温度を4時間保持した)以外は、実施例3と同様にして、チタン酸アルミニウム系セラミックスの成形焼成体および粉末を得た。
比較例として、ガラスフリットの前粉砕処理を行なわずに原材料粉末を混合する以外は、実施例1と同様にして、チタン酸アルミニウム系セラミックスの成形焼成体および粉末を得た。
比較例として、ガラスフリットの前粉砕処理を行なわずに原材料粉末を混合する以外は、実施例2と同様にして、チタン酸アルミニウム系セラミックスの成形焼成体および粉末を得た。
Claims (11)
- チタニウム源粉末、アルミニウム源粉末およびケイ素源粉末を含む原材料混合物を焼成するチタン酸アルミニウム系セラミックスの製造方法であって、
前記ケイ素源粉末の体積基準での累積百分率50%相当粒子径(D50)が5μm以下であることを特徴とするチタン酸アルミニウム系セラミックスの製造方法。 - 前記原材料混合物が、さらにマグネシウム源粉末を含む、請求項1記載の製造方法。
- 前記焼成の温度が1300〜1650℃である、請求項1記載の製造方法。
- 前記ケイ素源粉末の体積基準での累積百分率90%相当粒子径(D90)が18μm以下である、請求項1記載の製造方法。
- 前記ケイ素源粉末がガラスフリットである、請求項1記載の製造方法。
- 前記チタニウム源粉末の体積基準での累積百分率50%相当粒子径(D50)が0.1〜20μmである、請求項1記載の製造方法。
- 前記アルミニウム源粉末の体積基準での累積百分率50%相当粒子径(D50)が1〜100μmである、請求項1記載の製造方法。
- 前記マグネシウム源粉末の体積基準での累積百分率50%相当粒子径(D50)が0.5〜20μmである、請求項2記載の製造方法。
- 原材料混合物中に含まれるチタニア(TiO2)換算のチタニウム源粉末の使用量およ
びアルミナ(Al2O3)換算のアルミニウム源粉末の使用量の合計量100質量部に対して、チタニア換算のチタニウム源粉末の使用量は30〜70質量部であり、アルミナ換算のアルミニウム源粉末の使用量は30質量部〜70質量部であり、かつ、シリカ(SiO2)換算のケイ素源粉末の使用量は、0.1質量部〜20質量部である、請求項1に記載の製造方法。 - チタニア(TiO2)換算のチタニウム源粉末の使用量とアルミナ(Al2O3)換算の
アルミニウム源粉末の使用量との合計量100質量部に対して、マグネシア(MgO)換算のマグネシウム源粉末の使用量は0.1質量部〜10質量部である、請求項2に記載の製造方法。 - さらに、原材料混合物の焼成後に得られたチタン酸アルミニウム系セラミックス焼成物を解砕する工程を含む、請求項1記載の製造方法。
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JP2004026508A (ja) * | 2002-04-26 | 2004-01-29 | Tsutomu Fukuda | チタン酸アルミニウム系焼結体の製造方法 |
JP2008514542A (ja) * | 2004-09-29 | 2008-05-08 | 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に基づく、ガラス相を含むセラミック体 |
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US7959704B2 (en) * | 2005-11-16 | 2011-06-14 | Geo2 Technologies, Inc. | Fibrous aluminum titanate substrates and methods of forming the same |
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BR112012011073B8 (pt) * | 2009-11-10 | 2023-01-10 | Massachusetts Inst Technology | Método para aumentar a produção de terpenoide em uma célula que produz um ou mais terpenoides |
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2009
- 2009-06-22 JP JP2009147921A patent/JP2010132527A/ja active Pending
- 2009-11-05 EP EP09824821A patent/EP2360130A4/en not_active Withdrawn
- 2009-11-05 KR KR1020117009644A patent/KR20110083634A/ko not_active Application Discontinuation
- 2009-11-05 US US13/124,079 patent/US20110248106A1/en not_active Abandoned
- 2009-11-05 WO PCT/JP2009/068904 patent/WO2010053122A1/ja active Application Filing
- 2009-11-05 CN CN2009801443767A patent/CN102209698A/zh active Pending
- 2009-11-06 TW TW098137791A patent/TW201031616A/zh unknown
Patent Citations (3)
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JPH1160240A (ja) * | 1997-08-18 | 1999-03-02 | Tsutomu Fukuda | チタン酸アルミニウム粉体及びチタン酸アルミニウム焼結体の製造方法 |
JP2004026508A (ja) * | 2002-04-26 | 2004-01-29 | Tsutomu Fukuda | チタン酸アルミニウム系焼結体の製造方法 |
JP2008514542A (ja) * | 2004-09-29 | 2008-05-08 | 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に基づく、ガラス相を含むセラミック体 |
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JP2013224255A (ja) * | 2013-05-14 | 2013-10-31 | Otsuka Chem Co Ltd | 柱状チタン酸アルミニウムの製造方法 |
JP2017538651A (ja) * | 2014-11-19 | 2017-12-28 | コーニング インコーポレイテッド | 制御されたサイズ分布を有するセラミック粉末 |
Also Published As
Publication number | Publication date |
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CN102209698A (zh) | 2011-10-05 |
EP2360130A1 (en) | 2011-08-24 |
TW201031616A (en) | 2010-09-01 |
US20110248106A1 (en) | 2011-10-13 |
KR20110083634A (ko) | 2011-07-20 |
EP2360130A4 (en) | 2012-07-04 |
WO2010053122A1 (ja) | 2010-05-14 |
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