JP5799336B2 - 圧電配向セラミックスおよびその製造方法 - Google Patents
圧電配向セラミックスおよびその製造方法 Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims description 70
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- 239000013078 crystal Substances 0.000 claims description 38
- 238000010304 firing Methods 0.000 claims description 35
- 150000001875 compounds Chemical class 0.000 claims description 28
- 229910052726 zirconium Inorganic materials 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 20
- 238000002441 X-ray diffraction Methods 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 31
- 238000005245 sintering Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000013074 reference sample Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- -1 dried Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000007088 Archimedes method Methods 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
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Description
また、この発明にかかる圧電配向セラミックスでは、圧電配向セラミックスを構成する粒子が球状であることが好ましい。
この発明にかかる圧電配向セラミックスの製造方法は、圧電配向セラミックスの所定の断面におけるX線回折パターンに基づいて、Lotgering法により算出した配向度が0.64以上である圧電配向セラミックスの製造方法であって、圧電配向セラミックスの製造方法は、ペロブスカイト構造を有するPb(Ti,Zr)O3系化合物を含む単結晶粉末を用意する工程と、分散相として、単結晶粉末を含む、スラリーを作製する工程と、スラリーを磁場中で成形することによって、成形体を得る工程と、成形体を焼成する工程と、を含み、成形体を焼成する工程は、焼成温度の保持時間が3時間の条件で焼成した場合に、焼結密度が理論密度の85%以上となる焼成温度のうち、最も低い焼成温度よりも100℃以上低い温度で24時間以上保持して焼成することを特徴とする、圧電配向セラミックスの製造方法である。
本発明に係る圧電配向セラミックスは、ペロブスカイト構造を有するPb(Ti,Zr)O3系化合物を主成分とする圧電配向セラミックスである。また、この圧電配向セラミックスを構成する粒子は、球状であることが好ましい。圧電配向セラミックスを構成する粒子を球状の場合、クラックの発生や進展を生じさせにくくすることができるからである。
ρtheo=Wunit/Vunit (1)
ここで、Wunitは、単位格子あたりの重量を示し、Vunitは、単位格子あたりの体積を示す。
次に、本発明に係る圧電配向セラミックスの製造方法の実施の形態について説明する。
(試料1)
試料1は、以下に記載の作製方法により作製された。
PbO,TiO2,ZrO2をPb,Ti,Zrのモル比が1:0.7:0.3となるように秤量し、ボールミルにて15時間湿式混合した後、900℃にて仮焼乾燥し、Pb(Ti0.7Zr0.3)O3仮焼物を得た。
試料2は、以下に記載の作製方法により作製された。
PbO,TiO2,ZrO2をPb,Ti,Zrのモル比が1:0.7:0.3となるように秤量し、ボールミルにて15時間湿式混合した後、900℃にて仮焼乾燥し、Pb(Ti0.7Zr0.3)O3仮焼物を得た。
試料3は、以下に記載の作製方法により作製された。
PbO,TiO2,ZrO2をPb,Ti,Zrのモル比が1:0.7:0.3となるように秤量し、ボールミルにて15時間湿式混合した後、900℃にて仮焼乾燥し、Pb(Ti0.7Zr0.3)O3仮焼物を得た。
次に、上述の作製方法により得られた各試料に係る焼結体の所定の断面における配向度を、Lotgering(ロットゲーリング)法により、以下の数式(2)から算出した。配向度の計算では、磁場を印加しない状態で成形した成形体を焼成することにより得られたPb(Ti0.7Zr0.3)O3の焼結体を基準試料とした。
Claims (3)
- ペロブスカイト構造を有するPb(Ti,Zr)O3系化合物を主成分とする圧電配向セラミックスであって、
前記圧電配向セラミックスは、
前記圧電配向セラミックスの所定の断面におけるX線回折パターンに基づいて、Lotgering法により算出した配向度が0.64以上であり、かつ、焼結密度が理論密度の85%以上であることを特徴とする、圧電配向セラミックス。 - 前記圧電配向セラミックスを構成する粒子は、球状であることを特徴とする、請求項1に記載の圧電配向セラミックス。
- 圧電配向セラミックスの所定の断面におけるX線回折パターンに基づいて、Lotgering法により算出した配向度が0.64以上である圧電配向セラミックスの製造方法であって、
前記圧電配向セラミックスの製造方法は、
ペロブスカイト構造を有するPb(Ti,Zr)O3系化合物を含む単結晶粉末を用意する工程と、
分散相として、前記単結晶粉末を含む、スラリーを作製する工程と、
前記スラリーを磁場中で成形することによって、成形体を得る工程と、
前記成形体を焼成する工程と、
を含み、
前記成形体を焼成する工程は、
焼成温度の保持時間が3時間の条件で焼成した場合に、焼結密度が理論密度の85%以上となる焼成温度のうち、最も低い焼成温度よりも100℃以上低い温度で24時間以上保持して焼成することを特徴とする、圧電配向セラミックスの製造方法。
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