无机材料学报 ›› 2017, Vol. 32 ›› Issue (6): 615-620.DOI: 10.15541/jim20160489 CSTR: 32189.14.10.15541/jim20160489

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原料预处理对BaTiO3压电陶瓷的物性影响

孙丹丹1, 张家良2, 武燕庆3, 张仲秋4, 刘大康5   

  1. (山东大学 物理学院, 晶体材料国家重点实验室, 济南 250100)
  • 收稿日期:2016-08-29 修回日期:2016-10-09 出版日期:2017-06-20 网络出版日期:2017-05-27
  • 作者简介:孙丹丹(1991–), 女, 硕士研究生. E-mail: sdd1133556@163.com
  • 基金资助:
    高等学校博士学科点专项科研基金(20130131110006)

Raw-material Pre-milling on Physical Property of BaTiO3 Piezoelectric Ceramics

SUN Dan-Dan1, ZHANG Jia-Liang2, WU Yan-Qing3, ZHANG Zhong-Qiu4, LIU Da-Kang5   

  1. (School of physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China)
  • Received:2016-08-29 Revised:2016-10-09 Published:2017-06-20 Online:2017-05-27
  • About author:SUN Dan-Dan. E-mail: sdd1133556@163.com
  • Supported by:
    Specialized Research Fund for the Doctoral Program of Higher Education (20130131110006)

摘要:

BaCO3微粉原料通常由尺寸较大的棒状颗粒所组成, 这些棒状颗粒在一次球磨过程中由于不容易粉碎, 从而对经预烧、二次球磨所得到的BaTiO3陶瓷微粉的化学组分的均匀性和颗粒度产生影响, 进而影响后序烧结制备的BaTiO3陶瓷的微观组织结构和压电性能。本研究重点探讨了以BaCO3和TiO2为原料、通过固相反应途径制备BaTiO3陶瓷时, 实施原料预处理对所制备的BaTiO3压电陶瓷物性的影响。研究发现, 配料前对BaCO3原料实施球磨预处理可明显地降低棒状颗粒的尺寸, 从而可获得颗粒度细化的BaTiO3陶瓷微粉, 进而制备致密度更高和晶粒尺寸更小而压电性能更高的BaTiO3陶瓷材料。研究中对BaCO3微粉进行不同时间的球磨预处理, 然后制备钛酸钡陶瓷, 考察了其压电性能、介电性质、铁电性能和微观结构等物理性质。利用同样的BaCO3微粉原料, 未经球磨预处理所制备的BaTiO3陶瓷的压电系数d33最高值为410 pC/N, 而实施合适的球磨预处理制备的BaTiO3陶瓷的压电系数d33最高值可达470 pC/N。

关键词: BaTiO3, 压电陶瓷, 原料预球磨处理, 微观结构

Abstract:

BaCO3 powder usually consists of large rod-shaped particles, which can not be easily broken up into fine ones when ball-milled together with TiO2 powder. This may lead to chemical compositional non-uniformity and large particle sizes of the subsequently synthesized BaTiO3 powder through the calcination and the secondary ball-milling procedure, and may eventually affect the microstructure and the piezoelectric properties of resultant BaTiO3 ceramics. Effects of the pre-milling treatment of BaCO3 powder on physical properties of the resultant BaTiO3 ceramics prepared by conventional solid-state reaction were investigated. The results show that an additional ball-milling treatment of BaCO3 powder before being mixed with TiO2 powder can remarkably reduce the size of the rod-like particles, which is an effective way to get good-quality BaTiO3 fine powder. In such a way, a series of small-grained dense BaTiO3 ceramics are fabricated with significantly high piezoelectric coefficient d33. The BaTiO3 ceramics were prepared with the BaCO3 powders ball-milled for different time before mixing with raw TiO2 powder. Physical properties of the resultant BaTiO3ceramics, including piezoelectric properties, dielectric properties, ferroelectric properties, and microstructure were investigated. A much enhanced d33 value of 470 pC/N was achieved for the BaTiO3 ceramics prepared with the BaCO3 powders ball-milled for 8 h, in comparison to the maximum value of 410 pC/N for those BaTiO3 ceramics prepared with un-ball-milled BaCO3 powders.

Key words: BaTiO3, piezoelectric ceramics, pre-milling of raw material, microstructure

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