Fabrication of alumina ceramics by pulse electric current sintering using magnesia-doped transition alumina powders prepared from polyhydroxoaluminum solutions.

Abstract

Alumina ceramics were densified by pulse electric current sintering using magnesia-doped transition alumina powders prepared by sol-gel method. The magnesia-doped powder has the advantage of densification under lower PECS pressure, as compared with the powder without containing magnesia. The alumina ceramics thus obtained consisted of a microstructure which was made up of relatively small and uniform grains. Translucent alumina ceramics were also obtainable using the magnesia-doped powder.