多孔PZT95/5铁电陶瓷的机械性能和铁电性能研究

doi:10.3724/SP.J.1077.2014.13563

无机材料学报 ›› 2014, Vol. 29 ›› Issue (7): 758-762.DOI: 10.3724/SP.J.1077.2014.13563 CSTR: 32189.14.SP.J.1077.2014.13563

多孔PZT95/5铁电陶瓷的机械性能和铁电性能研究

曾涛¹, 白杨¹, 沈喜训¹, 王保峰¹, 董显林², 周志勇²

(1.上海电力学院, 上海200090; 2.中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2013-10-30 修回日期:2013-12-09 出版日期:2014-07-20 网络出版日期:2014-06-20
基金资助:
上海市浦江人才计划(11PJ1404200);上海市教委科研创新项目(13YZ106);中国科学院无机功能材料与器件重点实验室开放课题(KLIFMD-2011-08)

Investigation on the Mechanical and Ferroelectric Properties of the Porous PZT 95/5 Ceramics

ZENG Tao¹, BAI Yang¹, SHEN Xi-Xun¹, WANG Bao-Feng¹, DONG Xian-Lin², ZHOU Zhi-Yong²

(1. Shanghai University of Electric Power, Shanghai 200090, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2013-10-30 Revised:2013-12-09 Published:2014-07-20 Online:2014-06-20
Supported by:
Shanghai Pujiang Program (11PJ1404200);Innovation Program of Shanghai Municipal Education Commission (13YZ106);Key Laboratory of Inorganic Function Material and Device, Chinese Academy of Sciences (KLIFMD-2011-08)

摘要/Abstract

摘要：

采用添加造孔剂的方法制备多孔锆钛酸铅(PZT95/5)铁电陶瓷, 研究了孔结构包括孔隙率、孔径及孔形状对多孔PZT95/5陶瓷机械性能和电性能的影响及机理, 并揭示多孔PZT95/5陶瓷微观结构、机械性能和铁电性能的内在联系。研究表明: 孔隙率的增加降低了多孔PZT95/5陶瓷的声阻抗, 改善了陶瓷与封装材料的声阻抗匹配. 孔隙率增加, 多孔PZT95/5陶瓷的屈服应力和剩余极化强度降低, 矫顽场强增大。孔结构对多孔PZT95/5陶瓷屈服应力的影响可由应力集中理论解释; 多孔PZT95/5陶瓷剩余极化强度随孔结构的变化可用内应力结合空间电荷理论加以解释。

关键词: 多孔, PZT95/5陶瓷, 铁电性能, 应力集中, 机械性能

Abstract:

Porous lead zirconate titanate (PZT95/5) ceramics were prepared by adding pore formers. The effects of pore structures including porosity, pore size and pore shape on the mechanical and ferroelectric properties of the porous PZT95/5 ceramics and their mechanisms were investigated, and the relationships between the microstructures and the mechanical and ferroelectric properties were revealed. The results showed that increase in porosity improved the acoustic impedance matching between ceramics and encapsulating materials by reducing the sound impedance values. With increase in porosity, the yield stress and remnant polarization (P_r) of the porous PZT95/5 ceramics decreased, while the coercive electric field increased. The porous PZT95/5 ceramics with spherical pores exhibited higher yield stress and remnant polarization (P_r) than that with irregular pores. The porous PZT95/5 ceramics with larger pore size exhibited lower yield stress and remnant polarization. However, compared with pore shape, pore size had minor effects on the yield stress and remnant polarization properties of the porous PZT95/5 ceramics. The effect of pore structure on the yield stress could be explained by stress concentration theory. The microscopic internal stress combined with space-charge theory was used to explain the variation of the remnant polarization with the pore structure.

Key words: porous PZT95/5 ceramics, ferroelectric properties, stress concentration, mechanical properties

中图分类号:

TM221

曾涛, 白杨, 沈喜训, 王保峰, 董显林, 周志勇. 多孔PZT95/5铁电陶瓷的机械性能和铁电性能研究[J]. 无机材料学报, 2014, 29(7): 758-762.

ZENG Tao, BAI Yang, SHEN Xi-Xun, WANG Bao-Feng, DONG Xian-Lin, ZHOU Zhi-Yong. Investigation on the Mechanical and Ferroelectric Properties of the Porous PZT 95/5 Ceramics[J]. Journal of Inorganic Materials, 2014, 29(7): 758-762.

图/表 8

图1 致密PZT95/5陶瓷与添加不同造孔剂的多孔PZT陶瓷的XRD图谱

Fig. 1 XRD patterns of the PZT95/5 ceramics with different pore formers

图2 多孔PZT95/5陶瓷的 (a)不规则孔, (b)球形孔和(c) 放大的球形孔的SEM照片

Fig. 2 SEM images of the porous PZT95/5 ceramics with (a) irregular pores and (b) spherical pores and (c) magnified microstructure of spherical pore

图3 造孔剂的添加量与多孔PZT95/5陶瓷孔隙率的关系

Fig. 3 Porosity of the porous PZT95/5 ceramics as a function of the content of pore formers

图4 多孔PZT95/5铁电陶瓷的声阻抗与孔隙率的关系

Fig. 4 Acoustic impedance of the porous PZT95/5 ceramics as a function of porosity

图5 多孔PZT95/5陶瓷孔隙率与屈服应力的关系

Fig. 5 Yield stress of the porous PZT95/5 ceramics as a function of porosity

图6 多孔材料应力集中模型(a)[10]和多孔PZT95/5陶瓷表面和内部的孔沿X-X’方向应力分布示意图(b)

Fig. 6 Stress concentration model in porous material (a) and schematic stress line distribution of the surfaced and internal pores along the line X-X’ in the porous PZT95/5 ceramics (b)

图7 不同孔隙率的多孔PZT95/5铁电陶瓷的电滞回线

Fig. 7 Ferroelectric hysteresis loops of the porous PZT95/5 ceramics with different porosities (a) Dense PZT95/5 ceramic, Porosity = 4.1%, Ec = 1138 V/mm; (b) Porosity = 7.2%, Ec = 1197.5 V/mm; (c) Porosity = 10.2%, Ec = 1301.5 V/mm;(d) Porosity = 13.5%, Ec = 1863.6 V/mm

图8 多孔PZT95/5陶瓷孔隙率与剩余极化强度的关系

Fig. 8 Remnant polarization of the porous PZT95/5 ceramics as a function of porosity

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多孔PZT95/5铁电陶瓷的机械性能和铁电性能研究

Investigation on the Mechanical and Ferroelectric Properties of the Porous PZT 95/5 Ceramics

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