JP7333146B2 - 複合相巨大誘電体セラミック材料及びその製造方法 - Google Patents
複合相巨大誘電体セラミック材料及びその製造方法 Download PDFInfo
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- JP7333146B2 JP7333146B2 JP2021527997A JP2021527997A JP7333146B2 JP 7333146 B2 JP7333146 B2 JP 7333146B2 JP 2021527997 A JP2021527997 A JP 2021527997A JP 2021527997 A JP2021527997 A JP 2021527997A JP 7333146 B2 JP7333146 B2 JP 7333146B2
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- 229910010293 ceramic material Inorganic materials 0.000 title claims description 68
- 239000002131 composite material Substances 0.000 title claims description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000203 mixture Substances 0.000 claims description 43
- 239000000843 powder Substances 0.000 claims description 40
- 229910052758 niobium Inorganic materials 0.000 claims description 16
- 238000000498 ball milling Methods 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052738 indium Inorganic materials 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 6
- 235000019441 ethanol Nutrition 0.000 claims description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000008213 purified water Substances 0.000 claims description 2
- -1 rare earth cations Chemical class 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 150000004677 hydrates Chemical class 0.000 claims 2
- 230000015556 catabolic process Effects 0.000 description 8
- 238000005469 granulation Methods 0.000 description 8
- 230000003179 granulation Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000376 reactant Substances 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 125000000350 glycoloyl group Chemical group O=C([*])C([H])([H])O[H] 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
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Description
本願で製造された複合相巨大誘電体セラミック材料は、巨大誘電率、低損失、優れた周波数・温度安定性を有する上で、特に、高絶縁電気抵抗率の高電圧絶縁破壊耐性を有し、その絶縁電気抵抗率が1011Ω・cmよりも高く、高エネルギー保存デバイス及びスーパーコンデンサに適用することができる。
好ましくは、前記複合相巨大誘電体セラミック材料の主相が、A5+とB3+が共ドープされたルチル型二酸化チタンであり、副相が、B2TiO5であり、かつ副相が、主相に均一に分散される。主相は、巨大誘電率を提供し、副性は、極めて優れた電気絶縁性能を有する。非連続的に、均一に主相との結晶境界で分布する副相は、弱い分極電荷の伝送を効果的に阻害することができ、これにより、材料の作動電圧及び破壊電圧を大幅に向上させながら、巨大誘電率の悪化を引き起こすことがない。
より好ましくは、前記副相が、直方晶構造のB2TiO5である。前記副相は、一回の合成過程において、主相よりも低い合成温度を有することにより、自発的相分離可能な直方晶構造のB2TiO5である。
好ましくは、前記複合相巨大誘電体セラミック材料の電気抵抗率が、1011Ω・cmを超える。
好ましくは、前記複合相巨大誘電体セラミック材料は、20Hz~2×106Hzの周波数範囲内の誘電率が、10000を超え、そして、前記複合相巨大誘電体セラミック材料は、周波数が2×105Hz未満である場合、誘電損失が、0.05未満である。
好ましくは、前記複合相巨大誘電体セラミック材料は、-160℃~170℃の温度範囲内の誘電率が、10000を超え、そして、前記複合相巨大誘電体セラミック材料は、-50℃~150℃の温度範囲内の誘電損失が、0.05未満である。
そして、本発明は、前記の複合相巨大誘電体セラミック材料の製造方法であって、
複合相巨大誘電体セラミック材料の組成式AxBnxTi1-(n+1)xO2に従って、対応するチタン源、A源及びB源をはかりとる工程(1)と、
上記反応物をボールミルタンクに置き、ボールミル処理を行い、乾燥し、均一な混合物粉体を得る工程(2)と、
工程(2)で得られる混合物粉体を乳鉢に置き、前記混合物粉体重量の5%~10%の精製水を加えて、均一に混合し、その後、粉体を金型に置き、少なくとも400MPaの圧力で圧力を保持し、生地シートを得て、そして、生地シートを乳鉢に置き、粉砕研磨し、予備粉体を得る工程(3)と、
工程(3)で得られる予備粉体を金型に置き、少なくとも2MPaの圧力で圧力を保持して成形し、その後焼結処理を行い、具体的には、焼結を、昇温速度:1.5~15℃/min、温度範囲:1200℃~1500℃、保温時間:1~24時間という条件にて行い、終了後、室温まで放冷し、緻密なセラミックシートを得る工程(4)と、
工程(4)で得られるセラミックシートを表面研磨処理し、その後焼入れを行い、具体的には、焼入れを、昇温速度:1.5~15℃/min、温度範囲:1000℃~1200℃、保温時間:1~24時間という条件にて行い、終了後、室温まで放冷し、複合相巨大誘電体セラミック材料を得る工程(5)と、
を含む製造方法を提供する。
好ましくは、前記工程(1)において、チタン源がTiO2であり、A源がA2O5であり、B源が、B2O3、B2(C2O4)3、B2(C2O4)3の水合物、B(NO3)3、B(NO3)3の水合物、B2(SO4)3、B2(SO4)3の水合物、B2(CO3)3 、B2(CO3)3の水合物、B(C2H3O2)3、B(C2H3O2)3の水合物からなる群より選ばれる少なくとも1種である。非酸化物であるB源は、副相の合成温度と結晶境界での変異性をさらに低下させ、B相の非連続的な均一な分布を形成することに寄与する。
好ましくは、前記工程(2)におけるボールミル処理は、分散剤としてエチルアルコールまたはアセトンを使用し、ボールミル媒介としてイットリア安定化ジルコニアボールを使用し、12時間以上ボールミル処理を行うことであり、前記工程(4)及び工程(5)において、焼結及び焼入れの雰囲気が、空気である。
好ましくは、前記工程(5)において、表面研磨処理は、まず、240メッシュのサンドペーパーで粗研磨し、その後、1200メッシュのサンドペーパーで仕上げ研磨することである。これにより、平坦な表面を形成することができ、表面粗さの焼入れ後の試料の性能に対する影響を回避できる。
本発明によれば、A5+とB3+金属イオンが同時にドープされたことで化学的修飾されたルチル型二酸化チタン構造により、主相が、A5+とB3+が共ドープされたルチル型二酸化チタンであり、かつ副相(B2TiO5)が主相に均一に分散された複合相材料を得る。この材料は、巨大誘電率、低損失、優れた周波数・温度安定性を示す上で、特に、高絶縁電気抵抗率の高電圧絶縁破壊耐性を有し、そのため、高エネルギー保存デバイス及びスーパーコンデンサに適用することができる。その利点は、以下の3つの点で示される。
本発明に係る複合相巨大誘電体セラミック材料の一実施例として、本実施例に係る複合相巨大誘電体セラミック材料の組成式は、AxBnxTi1-(n+1)xO2であり、ここで、AがNbであり、BがInであり、x=0.0125、n=2である。
本実施例に係る複合相巨大誘電体セラミック材料の製造方法は、以下のとおりである。
本発明に係る複合相巨大誘電体セラミック材料の一実施例として、本実施例に係る複合相巨大誘電体セラミック材料の組成式は、AxBnxTi1-(n+1)xO2であり、ここで、AがNbであり、BがInであり、x=0.075、n=2である。
本実施例に係る複合相巨大誘電体セラミック材料の製造方法は、以下のとおりである。
本発明に係る複合相巨大誘電体セラミック材料の一実施例として、本実施例に係る複合相巨大誘電体セラミック材料の組成式は、AxBnxTi1-(n+1)xO2であり、ここで、AがNbであり、BがInであり、x=0.0125、n=3である。
本実施例に係る複合相巨大誘電体セラミック材料の製造方法は、以下のとおりである。
本発明に係る複合相巨大誘電体セラミック材料の一実施例として、本実施例に係る複合相巨大誘電体セラミック材料の組成式は、AxBnxTi1-(n+1)xO2であり、ここで、AがNbであり、BがInであり、x=0.0125、n=4である。
本実施例に係る複合相巨大誘電体セラミック材料の製造方法は、以下のとおりである。
Claims (9)
- 複合相巨大誘電体セラミック材料であって、前記複合相巨大誘電体セラミック材料の組成式は、AxBnxTi1-(n+1)xO2であり、ここで、Aが、Nb、Ta、V、Mo、Sbからなる群より選ばれる少なくとも1種であり、Bが、In、Ga、Al、Co、Cr、Sc、Fe(III)、3価の希土カチオンからなる群より選ばれる少なくとも1種であり、nが、BとAとのモル比であり、かつ、1<n≦4、0.0125≦x≦0.075であり、前記複合相巨大誘電体セラミック材料の主相が、A5+とB3+が共ドープされたルチル型二酸化チタンであり、副相が、B2TiO5であり、かつ副相が、主相に均一に分散される、ことを特徴とする、複合相巨大誘電体セラミック材料。
- 前記副相が、直方晶構造のB2TiO5であることを特徴とする、請求項1に記載の複合相巨大誘電体セラミック材料。
- 前記複合相巨大誘電体セラミック材料の電気抵抗率が、1011Ω・cmを超えることを特徴とする、請求項1または2に記載の複合相巨大誘電体セラミック材料。
- 前記複合相巨大誘電体セラミック材料は、20Hz~2×106Hzの周波数範囲内の誘電率が、10000を超え、そして、前記複合相巨大誘電体セラミック材料は、周波数が2×105Hz未満である場合、誘電損失が0.05未満であることを特徴とする、請求項1または2に記載の複合相巨大誘電体セラミック材料。
- 前記複合相巨大誘電体セラミック材料は、-160℃~170℃の温度範囲内の誘電率が、10000を超え、そして、前記複合相巨大誘電体セラミック材料は、-50℃~150℃の温度範囲内の誘電損失が0.05未満であることを特徴とする、請求項1または2に記載の複合相巨大誘電体セラミック材料。
- 請求項1~5のいずれか一項に記載の複合相巨大誘電体セラミック材料の製造方法であって、
複合相巨大誘電体セラミック材料の組成式AxBnxTi1-(n+1)xO2に従って、対応するチタン源、A源及びB源をはかりとる工程(1)と、
工程(1)ではかりとられるチタン源、A源及びB源をボールミルタンクに置き、ボールミル処理を行い、乾燥し、均一な混合物粉体を得る工程(2)と、
工程(2)で得られる混合物粉体を乳鉢に置き、前記混合物粉体重量の5%~10%の精製水を加えて、均一に混合し、その後、粉体を金型に置き、少なくとも400MPaの圧力で圧力を保持し、生地シートを得て、そして、生地シートを乳鉢に置き、粉砕研磨し、予備粉体を得る工程(3)と、
工程(3)で得られる予備粉体を金型に置き、少なくとも2MPaの圧力で圧力を保持して成形し、その後、焼結処理を行い、焼結を、昇温速度:1.5~15℃/min、温度範囲:1200℃~1500℃、保温時間:1~24時間という条件にて行い、終了後、室温まで放冷し、緻密なセラミックシートを得る工程(4)と、
工程(4)で得られるセラミックシートを表面研磨処理し、その後、焼入れを行い、焼入れを、昇温速度:1.5~15℃/min、温度範囲:1000℃~1200℃、保温時間:1~24時間という条件にて行い、終了後、室温まで放冷し、複合相巨大誘電体セラミック材料を得る工程(5)と、
を含むことを特徴とする、製造方法。 - 前記工程(1)において、チタン源がTiO2であり、A源がA2O5であり、B源が、B2O3、B2(C2O4)3、B2(C2O4)3の水合物、B(NO3)3、B(NO3)3の水合物、B2(SO4)3、B2(SO4)3の水合物、B2(CO3)3 、B2(CO3)3の水合物、B(C2H3O2)3、B(C2H3O2)3の水合物からなる群より選ばれる少なくとも1種であることを特徴とする、請求項6に記載の複合相巨大誘電体セラミック材料の製造方法。
- 前記工程(2)におけるボールミル処理は、分散剤としてエチルアルコールまたはアセトンを使用し、ボールミル媒介としてイットリア安定化ジルコニアボールを使用し、12時間以上ボールミル処理を行うことであり、前記工程(4)及び工程(5)において、焼結及び焼入れの雰囲気が空気であることを特徴とする、請求項6に記載の複合相巨大誘電体セラミック材料の製造方法。
- 前記工程(5)において、表面研磨処理は、まず、240メッシュのサンドペーパーで粗研磨し、その後、1200メッシュのサンドペーパーで仕上げ研磨することであることを特徴とする、請求項6に記載の複合相巨大誘電体セラミック材料の製造方法。
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