Abstract

Sintered bulks of ZrO_2 nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent two-step sintering employed in this study and the formability effects of nanopowder on mixing condition, pressure and sintering temperature were investigated. The addition of PVA induced and increase in the formability of the sintered bulk. But cracked bulks were obtained on sintering with addition of over 10 wt% PVA due to generation of crack during sintering. The optimum compaction pressure during MPC was 1.0 GPa and mixing conditions included using 5.0 wt% PVA. The optimum processing condition included MPC process, followed by two-step sintering (first at 1000 and then at 1450°C). The sintered bulks with the diameter of 30 mm under these conditions were found to have non crack, ~99% density.

• Keywords: Magnetic Pulsed Compaction (MPC);ZrO_2 nano Powder;PVA Powder;Sintering;Dental block;