压电陶瓷/硫铝酸盐水泥复合材料的压电性及介电性  

PIEZOEIECTRIC AND DIELECTRIC PROPERTIES OF PIEZOELECTRIC CERAMICSULPHOALUMINATE CEMENT COMPOSITES

作　　者：黄世峰[1] 常钧[2] 刘福田[2] 芦令超[2] 徐荣华[2] 闫嘉旺[3] 程新[2] 

机构地区：[1]武汉理工大学材料学院,武汉430070 [2]济南大学材料学院,济南250022 [3]唐山学院,河北唐山063020

出　　处：《硅酸盐学报》2004年第9期1082-1087,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50272024);山东省优秀中青年科学家科研奖励基金(03BS060)资助项目

摘　　要：采用水泥作为压电复合材料的基体,可有效解决机敏材料与混凝土母体结构材料之间的相容性问题。用压制法制备了铌锂锆钛酸铅[0.08Pb(Li1/4Nb3/4)O3·0.47PbTiO3·0.45PbZrO3,简称P(ZTNL)]/硫铝酸盐水泥复合材料,分析讨论了P(ZTNL)颗粒粒度和含量对水泥基压电复合材料的压电性和介电性的影响。结果表明:随着P(ZTNL)粒度的增大,复合材料的压电性和介电性均随之增大,但机电耦合系数则减小,当达到一定值后,机电耦合系数趋于稳定。综合分析表明,在所研究的材料中P(ZTNL)粒度应为100μm左右为宜。随着P(ZTNL)含量的增加,压电复合材料的压电常数和介电常数均增大,而介电损耗则减小,只有当P(ZTNL)质量分数超过70%时,水泥基压电复合材料才显示出较好的压电性能。P(ZTNL)的质量分数为85%时,压电复合材料的平面机电耦合系数KP和厚度伸缩机电偶合系数Kt分别为28.54%和28.19%。在-30～100℃范围内,水泥基压电复合材料的介电常数几乎不变,表现出优良的介电稳定性。Using cement as matrix of piezoelectric smart composites the mismatch problem of smart materials and concrete structure can be solved. The effects of the particle size and mass fraction of 0.08 Pb(Li_(1/4)Nb_(3/4))O_(3)·0.47PbTiO_(3) ·0.45PbZrO_(3) (\ on piezoelectric and dielectric properties of the cement matrix composites were studied. The results show that the piezoelectric and dielectric properties of the composites increase rapidly with the increase of particle size of P(ZTNL), but the electromechanical coupling factor K_(p )(planar) and K_(t )(thickness vibration)of the composites decrease. The K_(p )and K_(t)are nearly independent of the size when P(ZTNL) particle size reaches to a certain value. The optimum P(ZTNL) particle size is about 100 μm. With the increasing of P(ZTNL) mass fraction,the piezoelectric and dielectric constants of the composites increase, and the dielectric loss drops down quickly. The composites with better piezoelectric performances can be obtained when the mass fraction of P(ZTNL) content 70%.K_p and K_t of the composite with 85% P(ZTNL) are 28.54% and 28.19% respectively.The dielectric constants of the composites are almost unchanged at -30-100 ℃,which exhibit good dielectrictemperature stability.

关 键 词：压电陶瓷 水泥基压电复合材料 压电性能 介电常数 机电耦合系数 颗粒粒度 

分 类 号：TB332[一般工业技术—材料科学与工程] TU525[建筑科学—建筑技术科学]