JP2009190912A - 誘電体粉末の製造方法 - Google Patents
誘電体粉末の製造方法 Download PDFInfo
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- JP2009190912A JP2009190912A JP2008031509A JP2008031509A JP2009190912A JP 2009190912 A JP2009190912 A JP 2009190912A JP 2008031509 A JP2008031509 A JP 2008031509A JP 2008031509 A JP2008031509 A JP 2008031509A JP 2009190912 A JP2009190912 A JP 2009190912A
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- titanium dioxide
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- 239000000843 powder Substances 0.000 title claims abstract description 137
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 238
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 101
- 239000000460 chlorine Substances 0.000 claims abstract description 76
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 75
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 75
- 150000001553 barium compounds Chemical class 0.000 claims abstract description 13
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011812 mixed powder Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 12
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 40
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000009257 reactivity Effects 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000000197 pyrolysis Methods 0.000 abstract 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 76
- 229910002113 barium titanate Inorganic materials 0.000 description 76
- 239000002245 particle Substances 0.000 description 68
- 238000010438 heat treatment Methods 0.000 description 64
- 239000002994 raw material Substances 0.000 description 29
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 229910052788 barium Inorganic materials 0.000 description 17
- 230000008569 process Effects 0.000 description 15
- 239000010936 titanium Substances 0.000 description 12
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 11
- 238000006298 dechlorination reaction Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 11
- 230000002159 abnormal effect Effects 0.000 description 10
- 239000003985 ceramic capacitor Substances 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 9
- 229910052719 titanium Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 8
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 8
- 239000010419 fine particle Substances 0.000 description 7
- 238000003746 solid phase reaction Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 238000005660 chlorination reaction Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000002411 thermogravimetry Methods 0.000 description 4
- 238000004438 BET method Methods 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004255 ion exchange chromatography Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000011164 primary particle Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 238000002076 thermal analysis method Methods 0.000 description 3
- 239000011882 ultra-fine particle Substances 0.000 description 3
- 238000009827 uniform distribution Methods 0.000 description 3
- 239000012808 vapor phase Substances 0.000 description 3
- HNSDLXPSAYFUHK-UHFFFAOYSA-N 1,4-bis(2-ethylhexyl) sulfosuccinate Chemical compound CCCCC(CC)COC(=O)CC(S(O)(=O)=O)C(=O)OCC(CC)CCCC HNSDLXPSAYFUHK-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000000634 powder X-ray diffraction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- WKBPZYKAUNRMKP-UHFFFAOYSA-N 1-[2-(2,4-dichlorophenyl)pentyl]1,2,4-triazole Chemical compound C=1C=C(Cl)C=C(Cl)C=1C(CCC)CN1C=NC=N1 WKBPZYKAUNRMKP-UHFFFAOYSA-N 0.000 description 1
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
【解決手段】表面塩素量と内部塩素量との合計が2000ppm以下、表面塩素量が120ppm以下、ルチル化率が30%以下、BET比表面積が30m2/g以上の二酸化チタン粉末を準備する工程、加熱分解によって酸化バリウムを生成するバリウム化合物粉末を準備する工程、二酸化チタン粉末とバリウム化合物粉末との混合粉末を準備する工程、および該混合粉末を熱処理する工程を含む誘電体粉末の製造方法。
【選択図】図1
Description
しかし近年、電子機器の小型化が加速し、積層セラミックコンデンサにおいても、誘電体層をさらに薄層化することが求められている。このため、誘電体粉末の原料である二酸化チタン粉末をさらに微粒化することが求められる。すなわち原料である二酸化チタン粉末の粒径とその分布を維持した状態で、チタン酸バリウムを熱処理し、かつ得られたチタン酸バリウムの結晶性が高く粒径が均一となるものが求められる。
(1)表面塩素量と内部塩素量との合計が2000ppm以下、表面塩素量が120ppm以下、ルチル化率が30%以下、BET比表面積が30m2/g以上の二酸化チタン粉末を準備する工程、
加熱分解によって酸化バリウムを生成するバリウム化合物粉末を準備する工程、
二酸化チタン粉末とバリウム化合物粉末との混合粉末を準備する工程、および
該混合粉末を熱処理する工程を含む誘電体粉末の製造方法。
(2)前記二酸化チタン粉末の表面塩素量と内部塩素量との重量比(表面塩素量/内部塩素量)が0.15以下である(1)に記載の製造方法。
(3)上記(1)に記載の製造方法により得られる誘電体粉末。
(4)BET比表面積が4m2/g以上、c/aが1.008以上である(3)に記載の誘電体粉末。
(5)BET比表面積が10m2/g以上である(3)に記載の誘電体粉末からなる共材。
本発明のチタン酸バリウムの製造方法は、二酸化チタン粉末とバリウム化合物粉末との混合粉末を熱処理する工程を含む。
ルチル化率は、二酸化チタン粉末のX線回折分析から求められる。
なお、以下の実施例および比較例において、各種物性評価は、以下のように行った。
原料として用いた二酸化チタン粉末10mgを1100℃で水蒸気蒸留し、分解物を0.09%の過酸化水素5mlに捕集し、イオンクロマトグラフィーにより塩素量を定量した。カラムはDionexAS17、溶離液は4−20mMのKOHを使用し、流速1.0ml/minにて測定した。
二酸化チタン粉末5gを純水45g中に投入し、撹拌、超音波分散の後、遠心分離して上澄液を回収した。上澄液を50倍希釈後、0.2μmのフィルタでろ過し、イオンクロマトグラフィーにより塩素量を定量した。カラムはDionexAS17、溶離液は1−30mMのKOHを使用し、流速1.0ml/minにて測定した。
原料として使用した二酸化チタン粉末のX線回折分析によりルチル化率を求めた。また、得られたチタン酸バリウム粉末のX線回折分析によりa軸とc軸を求め、正方晶性の指標であるc/a比および結晶粒径を求めた。
原料である二酸化チタン粉末および熱処理により得られたチタン酸バリウム粉末の比表面積をBET法により求めた。
具体的には、NOVA2200(高速比表面積計)を用い、紛量1g、窒素ガス、1点法 脱気条件300℃で15分保持、の条件で測定した。
チタン酸バリウムの比誘電率評価のため、以下のように試料を準備した。本発明の実施例および比較例で得られたチタン酸バリウム粉末に、バインダとしてPVA(ポリビニルアルコール樹脂)を10重量%添加し、加圧成型することにより、直径12.5mm、厚さ約0.6mmの円板状の試料を得た。次に、得られた円板状の試料の脱バインダ処理として、400℃、保持時間4時間、空気中での熱処理を行った。その後、チタン酸バリウムの成型体密度、誘電率が十分得られる誘電体焼成温度T2が1220℃〜1280℃の条件で熱処理(焼成)を行った。雰囲気:大気中、保持時間:2時間、昇温速度3.3℃/minの条件とした。
コンデンサ試料に対し、室温25℃および温度槽中−55℃〜140℃において、デジタルLCRメータ(YHP社製4284A)にて、周波数1kHz、入力信号レベル(測定電圧)1Vrmsの信号を入力し、静電容量Cおよび誘電損失tanδを測定した。そして、比誘電率εs(単位なし)を、誘電体試料の厚みと、有効電極面積と、測定の結果得られた静電容量Cとに基づき算出した。強誘電体転移温度は、比誘電率のピーク温度から求めた。
原料である炭酸バリウム粉末と二酸化チタン粉末の混合粉末の、TG分析(熱重量分析)を行った。Pt製の容器に30〜50mgを充填し、昇温速度3.3℃/分で1000℃まで上昇させた。雰囲気は200ml/分の空気フローとした。
[混合粉末の調製]
比表面積が30m2/gの炭酸バリウム粉末と、二酸化チタン粉末(TiO2(A))とをBa/Ti比が0.997となるように秤量し、ジルコニア(ZrO2)メディアを用いたボールミルにより72時間湿式混合し、その後、乾燥して、混合粉末を得た。湿式混合は、スラリー濃度を40重量%とし、ポリカルボン酸塩系の分散剤を0.5重量%添加する条件で行った。ここで二酸化チタン粉末は比表面積が大きい微粒子であるため、原料の混合は十分行う必要がある。
電気炉(バッチ炉)により大気雰囲気で、昇温速度3.3℃/分(200℃/時間)にて、室温から表1に示す熱処理温度T1まで昇温した。その後、熱処理温度にて2時間保持し、その後3.3℃/分(200℃/時間)で降温した。この熱処理条件をプロセス(A)とすると、このプロセスに対して、さらに高い正方晶性c/aが得られる熱処理条件をプロセス(B)とした。プロセス(B)は、熱処理中の雰囲気および昇温のステップを最適化したものであり、熱処理温度T1において2時間保持する部分は共通である。
二酸化チタン粉末としてTiO2(B)を用いた以外は実施例1と同様の操作を行った。結果を表2に示す。
(実施例3)
二酸化チタン粉末としてTiO2(A)を用いて、熱処理プロセス(B)とする以外は、実施例1と同様に、チタン酸バリウム粉末の試料を作成した。
実施例1、および実施例3の結果を表3に示す。
Claims (5)
- 表面塩素量と内部塩素量との合計が2000ppm以下、表面塩素量が120ppm以下、ルチル化率が30%以下、BET比表面積が30m2/g以上の二酸化チタン粉末を準備する工程、
加熱分解によって酸化バリウムを生成するバリウム化合物粉末を準備する工程、
二酸化チタン粉末とバリウム化合物粉末との混合粉末を準備する工程、および
該混合粉末を熱処理する工程を含む誘電体粉末の製造方法。 - 前記二酸化チタン粉末の表面塩素量と内部塩素量との重量比(表面塩素量/内部塩素量)が0.15以下である請求項1に記載の製造方法。
- 請求項1に記載の製造方法により得られる誘電体粉末。
- BET比表面積が4m2/g以上、c/aが1.008以上である請求項3に記載の誘電体粉末。
- BET比表面積が10m2/g以上である請求項3に記載の誘電体粉末からなる共材。
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