Abstract
In present study, effect of sintering temperature on density and hardness of 3mol% yttria-stabilized tetragonal zirconia (referred to as TZ-3Y) composite reinforced with alumina whiskers (5, 10, 15 and 20wt.%) has been studied. Initially, Ammonium Aluminum Carbonate Hydroxide (AACH) whiskers were added in TZ-3Y composite and transformed into alumina during sintering performed at different temperatures i.e. 1400, 1500 and 1650°C. Results revealed that for all sintering temperatures, with increase in whisker concentration, sintered density decreased and hardness increased conversely. Maximum hardness of 14.47GPa was achieved with 10wt.% whiskers addition when sintered at 1500°C. However, with addition of CTAB (1wt.%) as deflocculating agent the hardness was further improved to 15.11GPa. While sintering at 1650°C a decrease in hardness was observed. It was mainly due to high temperature morphological change of whiskers i.e. transformation of whiskers into alumina rich grains.
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