Effect of Tb<sub>4</sub>O<sub>7</sub> Doping on Wear Resistance of High-Alumina Ceramic

It was investigated that the effect of wear resistance of high-alumina ceramic with a series of Tb 4 O 7 additives. It showed that wear resistance of ceramic firstly increased and then decreased with increasing of Tb 4 O 7 doped. And we found that microscopic played the vital role to affect wear resistance of alumina ceramic, decreasing grain sizes would improve the wear resistant. Terbium ions dissolved in liquid phases and the second phase of Tb 3 Al 5 O 12 appeared would improve microscopic of ceramic, taken grain sizes small and made ceramic density. Doped 0.2wt% Tb 4 O 7 , alumina ceramic with small grain sizes had better wear resistance than other ceramic.