LAUSR

Abstract The aim of this paper is to investigate the effect of slip casting process and the annealing before and after sintering to achieve a transparent MgAl2O4. To remove contaminants such as carbon from the structure of shaped spinel bodies, at first, the samples were annealed at temperature of 800 °C, 900 °C and 1000 °C for 2 h and then sintered at 1400 °C. By annealing the sample before sintering at 900 °C, the transmission increased (15% at IR region and 10% at visible region). Although by annealing the samples, the amount of carbon contamination reduced. Annealing the samples after sintering also had some desirable results. The samples annealed at temperature of 1200 °C for a time of 3, 5 and 10 h. The darkness of samples reduced due to the removal of carbon impurities and the sample was annealed at 1200 °C for 5 h had the most transparency in the visible and infrared regions.