0.655PMN-0.345PT压电陶瓷流延成型工艺研究

文章利用前驱体法和流延成型法先后制备了具有纯铌铁矿相结构MgNb2O6前驱体以及纯钙钛矿相的0.655Pb(Mg1/3Nb2/3)O3-0.345PbTiO3(0.655PMN-0.345PT)压电陶瓷。利用X射线衍射仪和扫描电子显微镜等设备,研究了烧结温度对压电陶瓷物理性能、微观形貌和电性能的影响。结果表明:烧结温度为1200℃时,陶瓷的综合性能最好,压电常数d33=700pC/N,机电耦合系数kp=0.605,介电常数εr=4.77×10^3,介电损耗tanδ=0.016,剩余极化强度Pr=30.68μC/cm^2。

In this paper,the precursor MgNb2O6 with pure tantalum phase was initially fabricated by precursor method,0.655Pb(Mg1/3Nb2/3)O3-0.345PbTiO3(0.655PMN-0.345PT)piezoelectric ceramics with purity perovskite phase were synthesized by tape-casting process.Through the X-ray diffractometers and scanning electron microscopes analyses,the influences from sintering temperature on the physical,microstructure and electrical properties were studied.The results show that the comprehensive properties of the ceramics are the best when the sintering temperature is 1200℃.The piezoelectric constant is d33=700pC/N,the electromechanical coupling coefficient kp=0.605,isεr=4.77×10^3,the dielectric loss tanδ=0.016,and the residual polarization Pr=30.68μC/cm^2。