LiTaO_3压电陶瓷烧结工艺的优化

OPTIMIZATION OF SINTERING PROCESS OF LiTaO_3 PIEZOELECTRIC CERAMIC

采用氮气保护热压烧结工艺制备LiTaO3压电陶瓷材料,研究了不同烧结方法和热压烧结压力对LiTaO3压电陶瓷致密度和力学性能的影响。无压烧结不能得到烧结致密的LiTaO3基压电陶瓷。1300℃/25MPa热压烧结制备的纯LiTaO3陶瓷的烧结致密度很低,只有91.5%,其各项力学性能很差。1300℃/35MPa热压烧结制备的纯LiTaO3陶瓷材料的致密度较高,已经达到了97%,材料烧结较致密,气孔较少,但由于LiTaO3本身性质所限其各项力学性能变化不大。

LiTaO3 piezoelectric ceramic was prepared by hot pressing in nitrogen atmosphere.Effects of different sintering methods such as pressureless sintering and hot press sintering on relative density and mechanical properties of the Al2O3/LiTaO3（ALT） composite ceramics and pure LiTaO3 piezoelectric ceramic were investigated to obtain a preferable sintering process.LiTaO3 matrix piezoelectric ceramic can＇t be obtained by pressureless sintering.Relative density of pure LiTaO3 piezoelectric ceramic is only 91.5% when sintered by hot pressing at 1300°C under 25MPa.Relative density of pure LiTaO3piezoelectric ceramic has reached 97% when sintered by hot pressing at 1300° C under 35MPa and fewer pores are observed in ceramic,but mechanical properties of pure LiTaO3 piezoelectric ceramic have not changed.