The roasting process of leachable alumina based ceramic core has been systematically studied in this paper, the results show that, the roasting process should be divided into two parts, i.e., dewaxing process and sintering process, and the plasticizer can be removed completely from the ceramic green body by the dewaxing process with little residue left behind. The sintering temperature and mineralizer are the decisive factors to ensure the strength of ceramic core. The apparent porosity of ceramic core will decrease obviously while the room temperature flexural strength will increase when the sintering temperature is rising. The room temperature flexural strength can exceed 14MPa when the ceramic core samples sintered at 1550 degrees C. The ceramic core samples will present excellent comprehensive properties when the sintering temperature is 1550 degrees C and the added quantity of SiO2 is 8 similar to 10%, i.e., apparent porosity is 44.7 similar to 46.9%, bulk density is 1.93 similar to 1.99 g/cm(3), room temperature flexural strength is 10.65 similar to 11.93MPa.
