静电场中多孔PZT95/5铁电陶瓷的通道电-机械击穿模型及分析

蒋一萱; 王省哲; 贺红亮

doi:10.11858/gywlxb.2014.06.006

静电场中多孔PZT95/5铁电陶瓷的通道电-机械击穿模型及分析

doi: 10.11858/gywlxb.2014.06.006

蒋一萱^1,,
王省哲^1,*, ,,
贺红亮²

1.
西部灾害与环境力学教育部重点实验室，兰州大学土木工程与力学学院，甘肃兰州 730000
2.
中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，四川绵阳 621999

基金项目: 中国工程物理研究院科学技术发展基金(2010A0201005)；中央高校基本科研业务费专项资金(lzujbky-2010-17)

详细信息

作者简介:
蒋一萱(1980—), 女，硕士，讲师，主要从事冲击波加载下铁电陶瓷力学特性研究.E-mail:jyix@lzu.edu.cn

通讯作者:
王省哲(1972—), 男，博士，教授，主要从事电磁固体力学研究.E-mail:xzwang@lzu.edu.cn

中图分类号: O521.23
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出版历程
- 收稿日期: 2012-06-25
- 修回日期: 2012-09-09

Channel Induced Electro-Mechanical Breakdown Model for Porous PZT95/5 Ceramics in Quasi-Static Electric Fields

1.
Key Laboratory of Mechanics on Environment and Disaster in Western China, Ministry of Education of China, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621999, China

摘要

摘要: 作为爆电电源的多孔PZT95/5铁电陶瓷具有极为重要的工程应用背景，但它在强电场作用下易发生电击穿失效，从而影响其放电效率，甚至造成电源失效。基于多孔PZT95/5铁电陶瓷材料在外电场作用下内部形成导电通道以致电失效的机制，通过通道内部局部放电及通道电-机械击穿机理，建立了导电通道诱导的多孔铁电陶瓷的电击穿模型并进行了相关的理论分析。基于本模型, 给出了不同孔隙率下铁电陶瓷的电击穿临界电场强度，预测结果与实验测试结果吻合良好, 且材料孔隙率越大，内部电击穿通道的特征尺寸越大，导致铁电陶瓷材料的电击穿临界场强显著降低。
- 多孔PZT95/5铁电陶瓷 /
- 击穿电场强度 /
- 导电通道 /
- 孔隙率
Abstract: As a promising candidate material in explosive power supplies, the porous PZT95/5 ferroelectric ceramics exhibit attractive advantages in engineering applications.However, the electrical breakdown of ferroelectric ceramics usually reduces their discharge efficiency, and even results in failure of the explosive power supply.In this paper, we presented a theoretical model of electro-mechanical breakdown for the porous PZT95/5 ferroelectric ceramics in quasi-static electric fields.The model is based on the mechanism of electro-mechanical breakdown and partial discharges in conducting channels generated inside the ceramics.Theoretical predictions of the critical electric-field breakdown strength of the ferroelectric ceramics with different porosities are carried out, and show good agreements with the experimental results.The characteristic size of the conducting channel increases with the porosity, which causes a significant reduce in the critical electric-field breakdown strength.
- porous PZT95/5 ferroelectric ceramics /
- electric-field breakdown strength /
- conducting channel /
- porosity

HTML全文

图 1 PZT95/5陶瓷电击穿场强随孔隙率的变化曲线

Figure 1. Dielectric breakdown strength of PZT95/5 ceramics as a function of porosity

下载: 全尺寸图片幻灯片

图 2 PZT95/5陶瓷电击穿场强随通道特征尺寸的变化曲线

Figure 2. Dielectric breakdown strength of PZT95/5 ceramics as a function of path feature size

下载: 全尺寸图片幻灯片

表 1 不同孔隙率及不同造孔剂的PZT95/5铁电陶瓷材料的击穿临界电场强度

Table 1. Dielectric breakdown strength of PZT95/5 ceramics with different porosities and pore formers

Material^[17]	Porosity/ (%)	Relative dielectric constant	Young's modulus/(GPa)	Path size/(μm)	Predicted breakdown strength/(kV/m)	Experimental breakdown strength/(kV/m)
Dense material by hot-press method	0.4	314	148	1.00	16 500	15 000
Dense	4.1	309	148	5.00	7 460	6 800
PMMA (Spherical shape)	7.2	281	136	6.00	7 140	-
	11.2	252	121	7.00	6 980	-
	13.5	241	112	8.00	6 680	6 600
Dextrin (Irregular pores)	8.9	249	121	7.50	6 790	6 650
Dextrin (Irregular pores)	10.7	236	112	8.00	6 750	6 550

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