Three-layer structure lead zirconate titanate ferroelectric ceramic material and preparation method thereof

A technology of lead zirconate titanate and ferroelectric ceramics, applied in the field of ferroelectric ceramic materials, can solve the problems of reducing the dielectric breakdown strength of materials, reducing material breakdown strength, increasing dielectric loss, etc., and achieving the electrical breakdown of dense ceramics Strength, optimized reliability and safety, effect of high electrical breakdown strength

Active Publication Date: 2014-02-05
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in porous ceramics, the introduction of pores reduces the dielectric breakdown strength of the material
According to the weak point breakdown theory, the introduction of pores increases the weakness of the ceramic material, which is likely to cause dielectric breakdown of the material; at the same time, in the preparation process of ferroelectric ceramic material electrodes, the introduction of pores also causes the silver layer to penetrate into the electrode during the electrode preparation process. Ceramics, resulting in an increase in the electrical conductivity of the material and an increase in dielectric loss, resulting in a decrease in the breakdown strength of the material

Method used

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  • Three-layer structure lead zirconate titanate ferroelectric ceramic material and preparation method thereof
  • Three-layer structure lead zirconate titanate ferroelectric ceramic material and preparation method thereof
  • Three-layer structure lead zirconate titanate ferroelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to PbZr 0.95 Ti 0.05 O 3 The stoichiometric ratio of Pb 3 O 4 , ZrO 2 and TiO 2 Raw materials, mixed powder with wet ball milling, finely ground, and then used solid-phase reaction method to keep the temperature at 800-900 ℃ for 1-3 hours to synthesize Pb (Zr x Ti 1-x )O 3 powder.

[0026] Weigh a certain amount of PbZr 0.95 Ti 0.05 O 3 Powder, add PbZr 0.95 Ti 0.05 O 3 PMMA microspheres with a diameter of 10 μm and 1% by weight of the powder were mixed uniformly, finely ground and dried, and PbZr was added. 0.95 Ti 0.05 O 3 PVA binder with a weight of 5% of the powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use; in addition, a certain amount of PbZr 0.95 Ti 0.05 O 3 Add PbZr to the powder 0.95 Ti 0.05 O 3 PVA binder of 5% by weight of powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use.

[0027] Add two plexiglass plate diaphragms to the forming mold to separate the mold into three la...

Embodiment 2

[0032] Prepare PbZr as in Example 1 0.95 Ti 0.05 O 3 powder.

[0033] Weigh a certain amount of PbZr 0.95 Ti 0.05 O 3 Powder, add PbZr 0.95 Ti 0.05 O 3 PMMA microspheres with a diameter of 20 μm and 1% by weight of the powder were mixed uniformly, finely ground and dried, and PbZr was added. 0.95 Ti 0.05 O 3 PVA binder with a weight of 5% of the powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use; in addition, a certain amount of PbZr 0.95 Ti 0.05 O 3 Add PbZr to the powder 0.95 Ti 0.05 O 3 PVA binder of 5% by weight of powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use.

[0034] Add two plexiglass plate diaphragms to the forming mold to separate the mold into three layers of space, and add a pore-forming agent PbZr to the middle layer 0.95 Ti 0.05 O 3 Powder with PbZr without pore former added to both surface layers 0.95 Ti 0.05 O 3 Powder, carefully remove the diaphragm, shape under 200MPa pressure, h...

Embodiment 3

[0036] Prepare PbZr as in Example 1 0.95 Ti 0.05 O 3 powder.

[0037] Weigh a certain amount of PbZr 0.95 Ti 0.05 O 3 Powder, add PbZr 0.95 Ti 0.05 O 3 PMMA microspheres with a diameter of 15-60 μm (D 50 = 30μm), mixed evenly, finely ground, dried, and added with PbZr 0.95 Ti 0.05 O 3 PVA binder with a weight of 5% of the powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use; in addition, a certain amount of PbZr 0.95 Ti 0.05 O 3 Add PbZr to the powder 0.95 Ti 0.05 O 3 PVA binder of 5% by weight of powder, granulated, aged for 24 hours, passed through a 30-mesh sieve for use.

[0038] Add two plexiglass plate diaphragms to the forming mold to separate the mold into three layers of space, and add a pore-forming agent PbZr to the middle layer 0.95 Ti 0.05 O 3 Powder with PbZr without pore former added to both surface layers 0.95 Ti 0.05 O 3 Powder, carefully remove the diaphragm, shape under 200MPa pressure, hold at 750°C for 2 hour...

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Abstract

The invention discloses a three-layer structure lead zirconate titanate ferroelectric ceramic material and a preparation method thereof. The three-layer structure lead zirconate titanate ferroelectric ceramic material is of a sandwich structure, wherein a core layer of the material is a porous lead zirconate titanate ceramic layer, and the porosity of the core layer is 5-30%; the upper surface and lower surface of the material are compact lead zirconate titanate ceramic layers. The preparation method comprises the following steps: (a) respectively preparing porous lead zirconate titanate ceramic powder and compact lead zirconate titanate ceramic powder; (b) adding the porous lead zirconate titanate ceramic powder to the middle layer of a mold divided into three layers of space by using membranes, adding the compact lead zirconate titanate ceramic powder to the upper surface and lower surface of the mold, removing the membranes, briquetting and demolding; (c) removing plastic, sintering, machining and carrying out silver electrode firing, thus obtaining the ceramic material. The ceramic material provided by the invention has the advantages of high electric breakdown strength, low loss property of compact ceramics and the shock resistance of porous ceramics, so that the reliability and safety of the ferroelectric ceramic material in a pulse power supply are optimized.

Description

technical field [0001] The invention relates to a three-layer structure lead zirconate titanate ferroelectric ceramic material and a preparation method thereof, belonging to the technical field of ferroelectric ceramic materials. Background technique [0002] Neilson proposed in 1957 that if a polarized ferroelectric can be depolarized under the action of an external shock wave, then the ferroelectric can be used as a pulsed power source (Neilson F W., Effects of strong shocks in ferroelectric materials., Bull. Am. Phys. Soc., 2, 302 (1957).). For a polarized ferroelectric, the stored energy density ω = Pr 2 / (2ε 0 ε r ), where Pr is the remanent polarization of the ferroelectric, ε r is the specific permittivity, ε 0 is the air dielectric constant. The PZT ceramic components in the high zirconium region are located near the ferroelectric-antiferroelectric phase boundary, and can induce phase transition under the action of electric field, temperature and stress. Espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/622
Inventor 聂恒昌董显林王根水陈学锋
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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