CNT改性水泥基压电复合材料制备与压电性能  

Preparation and Piezoelectric Properties of CNT Modified Cement-based Piezoelectric Composites

作　　者：罗健林[1] 张帅[1] 魏雪[1,2] 李秋义[1] 李璐[1] 孙胜伟[1,3] 

机构地区：[1]青岛理工大学蓝色经济区工程建设与安全协同创新中心,山东青岛266033 [2]深圳筑道建筑工程设计有限公司青岛分公司,山东青岛266033 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《压电与声光》2015年第3期437-440,445,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51208272);教育部高等学校博士点基金(新教师类)资助项目(20123721120004);青岛市应用基础研究计划基金资助项目(青年专项)(14-2-4-48-jch);山东省高校优秀科研创新团队计划基金资助项目

摘　　要：采用Fenton试剂结合超声分散和紫外线照射对CNT进行表面修饰,采用溶胶-凝胶法制备纳米级压电陶瓷(PZT),以CNT作为增强相,结合手动压片与直流极化工艺,制备出CNT改性水泥基压电复合材料。通过红外光谱和分光光度测试,当超声温度60℃、紫外线照射1h时,CNT分散液分散均匀,分散性最好。通过显微测试,CNT和PZT在水泥基压电复合材料中分散均匀,但结构致密度下降。压电常数和相对介电常数分别达到50.6pC/N、412.0,与相同条件下制备的PZT水泥基压电材料相比,分别提高18.5%、4.1%。同时,分散的CNT能发挥宏观量子隧穿效应,使复合材料在几乎不降低材料介电性能情况下更易极化。Nano-scale PZT powder was prepared by Sol-Gel method, CNT filler was surface modified with Fenton reagent combined with ultrasonic dispersion and ultraviolet irradiation; Hereafter, CNT modified Portland cement-based piezoelectric composites were prepared by mold pressing and DC polarization method. The test results of infrared spectrum and spectrophotometric show that when the ultrasonic temperature is 60 ℃ and ultraviolet rays irradiation time is 1 h, CNT uniformly disperses in aqueous suspension, the dispersivity reaches to its best. The mi- croscopic test show that CNT and PZT disperse evenly in cement-based piezoelectric composite, but the structural density decreases. The piezoelectric constant and relative dielectric can reach up to 50.6 pC/N and 412.0, respec- tively, and compared with the same conditions for preparation of PZT cement-based piezoelectric materials, it in- creases up to 18.5 %, 4.1%, respectively. Dispersed CNT fiber can play macroscope quantum tunneling effect, ren- dering that the composite is easier to polarization while hardly impairs its dielectric property.

关 键 词：纳米级PZT粉体 CNT表面修饰 水泥基压电复合材料 压电性能 微观结构 

分 类 号：TN384[电子电信—物理电子学] TB332[一般工业技术—材料科学与工程]