Development of Transparent Ceramic Scintillators by Electromagnetic Heating Using Far Infrared Rays

采用远红外线电磁加热的方法制备了石榴石陶瓷闪烁体。以Y_3Al_5O_(12)(Y_3Al_5O_(12)，Y_3Al_5O_(12))为原料进行了造粒。用28 GHz毫米波对空气中的YAG和LuAG样品进行辐照。样品表面温度达到1600℃，保温30min。与理论密度相比，烧结体的致密度为95%。扫描电子显微镜(SEM)图像观察表明，烧结体中的气孔较少。结果表明，电磁加热对石榴石陶瓷的致密化是有效的。烧结后的陶瓷呈半透明，但不透明。

Garnet type ceramic scintillators have been produced by electromagnetic heating using far infrared rays. Fine powders of Y3Al5O12 (YAG) were pelletized, and they were used as starting samples. 28 GHz millimeter wave was irradiated to YAG and LuAG samples in air. The temperature at the surface of samples reached to 1600 oC for 30 min. The density of sintered YAG ceramics was 95 %, compared to the theoretical density of the YAG crystal. The observation of scanning electron microscope (SEM) images revealed that there is few pore in sinterd YAG ceramics. The results obtained indicate that the electromagnetic heating is effective for the densification of garnet type ceramics. The sintered YAG ceramics was translucent, but not transparent.