真空热压烧结铌酸锂压电陶瓷研究
Research on Lithium Niobate Piezoelectric Ceramics by Vacuum Hot-Pressing Sintering
胡忠良 1张博 1禹建功 1王一强 1周红梅1
作者信息
- 1. 河南理工大学机械与动力工程学院,河南焦作 454000
- 折叠
摘要
采用真空热压烧结法对铌酸锂粉体进行烧结制备铌酸锂压电陶瓷,通过改变烧结温度、保温时间来确定最佳烧结方案;对烧结样品的密度、显微结构、物相组成、压电和介电等性能进行了测试.研究表明:在烧结温度900 ℃、保温时间120 min、压力35 MPa条件下制备的铌酸锂压电陶瓷致密度最高(4.62 g/cm3),同时其压电常数d33达最大(8.7 pC/N),相较于传统固相烧结法及CO2激光烧结法,其压电常数分别提高7.9 pC/N和2.7 pC/N.当测试频率介于1 kHz～1 MHz时,不同制备条件下铌酸锂压电陶瓷的介电常数均呈现迅速下降后趋于稳定的趋势.
Abstract
Lithium niobate(LN)powder was sintered by vacuum hot-pressing sintering to prepare LN pie-zoelectric ceramics,with the optimal sintering parameters determined by changing the sintering tempera-ture and holding time.The density,microstructure,phase composition,piezoelectric and dielectric proper-ties of the sintered samples were tested.The results show that LN piezoelectric ceramics prepared under the conditions of a sintering temperature of 900 ℃,a holding time of 120 minutes,and a pressure of 35 MPa exhibit the highest density(4.62 g/cm3)and the maximum piezoelectric constant d33(8.7 pC/N).Com-pared with the methods of traditional solid-phase sintering and CO2 laser sintering,the piezoelectric con-stant of the prepared LN piezoelectric ceramics increases by 7.9 pC/N and 2.7 pC/N,respectively.When the test frequency is within 1 kHz～1 MHz,the dieletric constant of LN piezoelectric ceramics prepared un-der different conditions decreases rapidly and then tends to stabilize.
关键词
真空热压烧结/铌酸锂/压电陶瓷/介电性能/压电性能Key words
vacuum hot-pressing sintering/lithium niobate/piezoelectric ceramics/dielectric property/piezoe-lectric property引用本文复制引用
基金项目
国家自然科学基金项目(U1804134)
河南省重点研发与推广专项科技攻关项目(222102230004)
河南省重点研发与推广专项科技攻关项目(232102220011)
出版年
2024
NETL
NSTL
万方数据