Development of Transparent MgAl2O4 Spinel Ceramics
The present paper summarizes the technology and basic process for fabricating transparent ceramic MgAl2O4 spinel and introduces a scalable production technique. Fully transparent polycrystalline spinel has been prepared by combined vacuum sintering, hot-pressing, sintering in H2 atmosphere and hot isostatic pressing(HIP). The optical transmittance of the specimen sintered at 1500°C following HIP at 1800°C was nearly the same as that of single crystal spinel. When radiated by γ-ray and X- ray, colorless spinel became brown due to V-type color centers, which decreased its transmittance. On the other hand, the spinel ceramics’ resistance to radiation improved by doping CeO2.
Wei Pan and Jianghong Gong
F. H. Li et al., "Development of Transparent MgAl2O4 Spinel Ceramics", Key Engineering Materials, Vols. 434-435, pp. 649-652, 2010