Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3系无铅压电陶瓷的制备工艺研究

利用XRD、SEM等分析技术 ,研究了Na0 .5Bi0 .5TiO3 -K0 .5Bi0 .5TiO3 系无铅压电陶瓷的合成温度 ,烧成工艺条件对陶瓷晶体结构、压电性能的影响。结果表明 ,合成温度提高有利于主晶相的形成 ,适当延长保温时间有利于材料的压电性能。该体系随着KBT含量的增加 ,烧结温度提高 ,烧结温度范围变窄。同时研究了极化工艺条件对材料压电性能的影响表明 ,提高极化电场和适当提高极化温度有利于压电性能的提高 ,但过高的温度由于受到材料高温下退极化的影响而导致材料压电性能变差

STUDY ON THE EFFECTS OF TECHNIQUE ON THE PROPERTIES OF NBT-KBT SYSTEM PIEZOCERAMICS

The effects of synthetic temperature and firing technique on the structure and piezoelectric properties of Na 0.5 Bi 0.5 TiO 3 system piezoceramics was studied by XRD,SEM and other analytic method.It shows that increasing synthetic temperature is useful for the crystalline formation and proper prologing soaking time is useful for the piezoelectric properties.With increasing the amount of KBT in this system,the higher is the sintering temperature,the narrower is the sintering temperature range.From the effects of poling technique on the piezoelectric properties in the system,it shows that higher poling electric field and poling temperature are helpful to improve the piezoelectric properties,but too high poling temperature will make the properties become bad because of the depolarization at the high temperature.