采用传统固相反应法制备了铌酸钠钾(KNN)粉体,在该粉体中添加碳纳米管(CNT)后,制备成CNT-KNN复合材料,研究了该复合材料的介电和压电性能。实验发现CNT的添加没有改变KNN压电陶瓷的晶体结构。少量的CNT添加(0.02‰(质量分数))提高了压电性能,过多的CNT(〉0.02‰(质量分数))会导致压电性能降低。同时发现,CNT的添加降低了样品的介电常数,介电性能明显依赖于密度关系。
We prepared CNT-KNN(carbon nanotube and potassium sodium niobate)composite and studied its structure and properties.The result shows:(1)phase structure and microstructure of the CNT-KNN composites don't change while the content of CNT varies;(2)0.02wt‰ CNT addition can improve the d33,but addition〉0.02wt‰ deteriorates d33;(3)dielectric constant decrease in all composites and strongly depend on density of composite samples.