作者：丁绍华, 马永力

作者单位：武汉大学土木建筑工程学院, 湖北 武汉 430072

关键词：水泥基压电复合材料;振动真空;压电性能;介电性能;机电耦合系数

摘要：

为改善水泥基压电复合材料的密实度，提高材料性能和耐久性，该文提出一种基于振动真空共同作用的方法，制备水泥基压电复合材料，设置两组对照试验。以普通硅酸盐水泥为基体，以锆钛酸铅压电陶瓷PZT为功能体，用振动真空和纯真空方法结合切割-填充法制备出1-3型、2-2型PZT/水泥基压电复合材料.研究分析振动真空和纯真空下水泥基压电复合材料的压电性、介电性和机电耦合性能的变化规律。结果表明：采用振动真空方法所得到的试件，其压电应变常数d₃₃和相对介电常数ε_γ比纯真空方法得到的结果相对偏大，而相对应的压电电压常数g₃₃则偏小，压电性能更好。振动真空方法得到的试件，其串联谐振频率f_s和并联谐振频率f_p较纯真空方法得到的试件要更小，而K_p、K_t和Q_m的值都稍微更大，机电耦合性能更好。

Characterization of performance improvement of cement-based piezoelectric composites by vacuum vibration method
DING Shaohua, MA Yongli
School of Civil Engineering, Wuhan University, Wuhan 430072, China
Abstract: PZT/cement-based piezoelectric composite of type 1-3 and 2-2 were prepared with ordinary portland cement as matrix and lead zirconate titanate PZT as functional materials by vibrating vacuum and pure vacuum combined with cutting-filling method. The variation of piezoelectricity, dielectric properties and electromechanical coupling performance of cement-based piezoelectric composites under vibration vacuum and pure vacuum was studied and analyzed. The results show that the piezoelectric constant d₃₃ and the relative permittivity ε_γ of the specimen obtained by the vibration vacuum method are relatively larger than those obtained by the pure vacuum method, while the corresponding piezoelectric voltage constants g₃₃ are smaller and the piezoelectric performance is better. The specimen obtained by the vibrating vacuum method has smaller series resonance frequency f_s and parallel resonance frequency f_p than the specimen obtained by the pure vacuum method, and the values of K_p, K_t and Q_m are slightly larger and the electromechanical coupling performance is better.
Keywords: cement-based piezoelectric composites;vibration vacuum;piezoelectric performance;dielectric properties;electromechanical coupling coefficient
2019, 45(3):30-35  收稿日期: 2018-06-05;收到修改稿日期: 2018-07-15
基金项目: 中央高校基本科研专项资金（000003）
作者简介: 丁绍华(1992-),男,江西抚州市人,硕士研究生,专业方向为水泥基压电传感器智能检测和监测
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