对激光烧结制备钛酸铋Bi4Ti3O12陶瓷进行了研究。采用CO2激光直接辐照Bi4Ti3O12陶瓷素坯表面, 激光功率密度为20～30 W/cm2, 烧结温度为1000 ℃左右。与传统固相反应烧结技术制备的Bi4Ti3O12陶瓷相比, 激光烧结制备的Bi4Ti3O12陶瓷致密度较高, 相对密度能达到95%, 压电性能提高了约60%, 铁电性能的增强表现在矫顽场的明显减小和易于极化。通过X射线衍射、扫描电镜分析了激光烧结Bi4Ti3O12陶瓷的物相、显微结构和电性能改变的机理。实验现象和结果表明, 激光烧结可以作为功能陶瓷烧结的方法之一。

The investigation on laser sintering of Bi4Ti3O12 ceramics is reported. The green patch of Bi4Ti3O12 ceramic was sintered by a CO2 laser, with power density 20～30 W/cm2 and sintering temperature around 1000 ℃. Compared with that sintered by conventional solid-state reaction technique ,the density of Bi4Ti3O12 ceramic sintered by laser is higher, reaches 95% of the theoretical one ,the piezoelectric constant was increased by 60% , the decrease of coercive field and easier polarization indicated that the enhancement of the ferroelectric properties. By using the X-ray diffraction (XRD), scanning electron microscope (SEM), the phase, microstructure, and the mechanism of property modification in laser sintered Bi4Ti3O12 ceramics were analyzed. It’s indicated that the measure of laser sintering could be regarded as one of the ways to sinter the functional ceramics.