摘要
采用溶胶/凝胶法在高居里点的LiNbO3压电颗粒表面覆盖SiO2薄膜,以压力浸渗工艺制备LiNbO3（SiO2）/ZL102基复合材料,并通过动态机械热分析仪研究了其在30～350℃下的阻尼性能.结果表明,当30℃时,LiNbO3（SiO2）/ZL102基复合材料的内耗是铝基体的3倍,LiNbO3/ZL102基复合材料的2倍;在所选用的测试温度范围内,铝基体、LiNbO3/ZL102和LiNbO3（SiO2）/ZL102基复合材料内耗随温度的升高而增加并最终趋于相近.这是由于极化处理的高居里点LiNbO3压电颗粒具有压电阻尼特性,而且SiO2薄膜改变了LiNbO3颗粒外部的电阻率,从而提高了其压电阻尼特性.
LiNbO3 piezoelectric particles of high Curie point coated by SiO2 via sol-gel method were used and then LiNbO3（SiO2）/ZL102 composites were fabricated through pressure infiltration.Damping properties from 30 ℃ to 350 ℃ were measured by dynamic mechanical thermal analyzer（DMTA）.The results reveal that the damping capacity of LiNbO3（SiO2）/ZL102 composite is three times the value of ZL102 alloy and two times as high as LiNbO3/ZL102 composite at 30 ℃.And with increasing temperature the damping capacities of three types of materials increase together and gradually become close.In the present paper,piezo-damping was achieved by using poled LiNbO3 piezoelectric particles.Moreover,the piezo-damping was enhanced by SiO2 coatings,which changed the resistivity around LiNbO3 particles.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2010年第5期711-714,717,共5页
Journal of Shanghai Jiaotong University
关键词
铝基复合材料
SIO2薄膜
阻尼
压电阻尼性能
aluminum matrix composites
SiO2 coatings
damping
piezo-damping performance
