制备工艺对0．95（K0．5 Na0．5）NbO3-0．05CaZrO3基无铅陶瓷压电性能的影响

摘要

Lead-free piezoelectric ceramics 0.95 (K0.5 Na0.5 )NbO3 -0.05CaZrO3 were prepared by traditional ceramics process.The effect of the sintering temperature and poling conditions on piezoelectric properties of 0.95(K0.5 Na0.5 )NbO3-0.05CaZrO3 ceramics was investigated.Results show that the optimum sintering temperature of 0.95(K0.5 Na0.5 )NbO3-0.05CaZrO3 ceramics is 1 170℃.Piezoelectric properties of 0.95(K0.5 Na0.5 )NbO3-0.05CaZrO3 ceramics under the opti-mum sintering temperature are piezoelectric constant d33 of 210 pC/N,planar electromechanical coupling factor kp of 0.40. At the same time,the results show that the optimum poling condition for 0.95(K0.5 Na0.5 )NbO3-0.05CaZrO3 ceramics is poling electric field of 4 kV/mm and poling temperature of 70℃.%采用传统陶瓷工艺制备了0．95（K0．5 Na0．5）NbO3-0．05CaZrO3无铅压电陶瓷。研究了烧结温度和极化工艺对陶瓷压电性能的影响。结果表明：随着烧结温度的提高，0．95（K0．5 Na0．5）NbO3-0．05CaZrO3陶瓷的体积密度增大，在1170℃时达到最大值，同时 d33和 kp，在此温度也分别达到他们的最大值210 pC／N和0．40。极化工艺对0．95（K0．5Na0．5） NbO3-0．05CaZrO3陶瓷的压电性能有明显的影响，0．95（K0．5 Na0．5）NbO3-0．05CaZrO3陶瓷的最佳极化温度是70℃，最佳极化电场是4 kV／mm。