PZT/PVDF压电复合材料的制备及其性能研究

PREPARATION AND PROPERTIES OF PIEZOELECTRIC COMPOSITES OF PZT/PVDF

用氧化物一步合成法制备了 PZT粉末 ,X射线衍射测试结果显示 ,它是 Zr/Ti为 5 2∶ 48的纯四方钙钛矿型结晶相 ,并用 SEM观察了 PZT粉末的形貌 ;用热分析仪测试了 PVDF的固化温度 ;在自制模具上采用模压 /烧结工艺获得了六种含 PZT不同体积含量的 PZT/PVDF复合材料 ;对其介电性和压电性的测试表明 ,随着 PZT体积含量的增加 ,电性能参数呈非线性增大 ,当 PZT的体积份数超过 70 %时 ,介电常数ε和压电常数 d33 值迅速增加 ,PZT体积份数达到 90 %时 ,其电性能参数与纯 PZT值接近 ,但此时复合材料的脆性较大 ,已没有实用价值。

PZT powder is made using oxide one off sintering technique. Its X ray diffraction (XRD) peaks are monitored and shown to be in crystallization phase of pure square with Zr/Ti equal to 52:48. The pattern of the PZT powder is observed with SEM; the mold technique of PVDF is analyzed by TG DTA. Six sorts of PZT/PVDF composites are obtained with different PZT volume ratios by compression mould/sintering technique. Tests of dielectric and piezoelectric show that electric parameter accretion increases nonlinearly with PZT content, when the volume content of PZT exceeds 70%, dielectric constant ε and piezoelectric constant d 33 increase rapidly, and when it reaches 90% the electric parameters are almost the same as the pure PZT's.