低温烧结制备(Ba_(0.9)Ca_(0.1))(Zr_(0.15)Ti_(0.85))O_3无铅压电陶瓷

(Ba_(0.9)Ca_(0.1))(Zr_(0.15)Ti_(0.85))O_3 lead-free piezoelectric ceramics prepared by low sintering temperature

采用溶胶-凝胶法制备出(Ba0.9Ca0.1)(Zr0.15Ti0.85)O3(简称BCT-BZT)粉体,并采用两段式传统烧结法用较低的烧结温度(1 290℃)制备了该无铅压电陶瓷,运用热重差示扫描测量法分析了反应过程。X射线衍射测试结果表明,BCT-BZT粉体和陶瓷均是典型的钙钛矿结构,根据谢乐公式计算出粉体的晶粒尺寸约为32nm。此外,室温下利用TF Analyzer 2000铁电分析仪测得该陶瓷的介电常数高达6 134,居里温度约为95℃,最大压电系数d33达到263pm/V。利用此方法制备的BCT-BZT无铅压电陶瓷,其烧结温度与固相反应法相比降低了约200℃左右,同时还保持了良好的压电性能,从而降低了烧结成本,有利于实现该陶瓷的大规模工业化生产。

The （Ba0.9 Ca0.1 ）（Zr0.15 Ti0.85 ）O3 powders had been successfully prepared by sol-gel method,and the BCT-BZT lead free piezoelectric ceramics were obtained by traditional two-step sintering method under lower temperature （1 290 ℃）.The reaction process was analyzed with the help of the thermo gravimetric and differential scanning calorimetry.X-ray diffraction results showed that the structure of the BCT-BZT powders and ceramics were typical perovskite structure and the particle size was approximately 32 nm by Scherrer calculation. Moreover,the dielectric constant of ceramic was 6 134 at the room temperature by TF analyzer 2 000;the Curie temperature was about 95 ℃.Especially,the piezoelectric response loops revealed that the maximum piezoelectric coefficient d33 reached 263 pm/V.We successfully get BCT-BZT lead-free piezoelectric ceramics by the method,the sintering temperature was about 200 ℃ lower than the solid phase reaction method,maintaining the good piezoelectric properties and reducing the sintering costs.So,it was conducive to realizing the largescale industrial production of ceramics.