Structural ceramics are generally superior in strength to metal at high temperatures. However, they must be sintered at high temperatures to achieve this high strength. Therefore, lowering the sintering temperature would have economic benefits, including in terms of energy consumption. This study investigated the possibility of reducing the sintering temperature by adding bismuth oxide(Bi₂O₃) to the sintering of aluminium oxide(Al₂O₃). The amount of Bi₂O₃ additive was changed to 12~19.1 wt.% and the sintering temperature was in the range of 850~1200 ^oC, and the compressive strength was evaluated under these conditions. The addition of Bi₂O₃ can decrease the necessary sintering temperature by about 400 ^oC. Ceramic structures that can be low temperature sintering can save costs due to reduced manufacturing costs, replacement costs, shutdowns, etc., which will ensure enormous economic efficiency.

Keywords: Al₂O₃, Bi₂O₃, Sintering temperature, Compressive strength, Economic effect