0-3型γ-C2S压电复合材料的制备及性能研究

Preparation and Properties of 0-3 γ-C2S Piezoelectric Composite

以γ型硅酸二钙(以下简称γ-C2S)为基体,以锆钛酸铅(PZT)为压电相,用压制成型、碳化养护方法制备出0-3型γ-C2S压电复合材料。分析了压电相体积分数及粒径分布、成型压力、碳化时间和极化时间对复合材料压电性能的影响,结果表明:复合材料压电性能在一定范围内随着压电相体积分数、成型压力、极化时间的增加而提高。在压电相体积分数从40%增加到85%时,复合材料压电应变常数d33从4.78 pC/N提升到67.8 pC/N;在压电相体积分数保持为60%,成型压力从50 MPa增加到200 MPa时,复合材料压电应变常数d33从14.6 pC/N提升到17.8 pC/N;在保持体积分数、成型压力一定时,极化时间为30 min较15 min复合材料具有更高的压电应变常数。同时,合理的颗粒级配对复合材料的压电性能也有显著的提升,当压电相体积分数为60%时,压电相陶瓷颗粒采用大颗粒、小颗粒混掺时复合材料压电性能得到显著提升,压电应变常数较只有小颗粒提升了1倍,达到33.9 pC/N。

A 0-3 piezoelectric composite was prepared using carbonatedγ-C2S as the matrix and lead zirconate titanate(PZT)as the piezoelectric phase.The composites were fabricated with compacted method and carbon dioxide curing.Based on the analysis of piezoelectric phase volume fraction and particle size distribution,molding pressure,carbonization time and poling time on the piezoelectric effect,the results showed that the piezoelectric properties were improved in a certain range with the increase of volume fraction of the piezoelectric phase,molding pressure,and poling time.The piezoelectric strain constant(d33)of the composites were increased from 4.78 pC/N to 67.8 pC/N as the volume fraction of the piezoelectric phrase increased from 40%to 85%;When the volume fraction of the piezoelectric phase was maintained at 60%,the d33 of the composites were improved from 14.6 pC/N to 17.8 pC/N as the forming pressure increased from 50 MPa to 200 MPa.When the volume fraction and the molding pressure were kept constant,the d33 of the composites with 30 min polarization was higher than that with 15 min polarization.At the same time,reasonable matching of the particle size would significantly improve the piezoelectric properties.The composites with the piezoelectric ceramic particles mixing the large particles and small particles had the better piezoelectric property with the d33 reaching 33.9 pC/N.