The effect of holding time on the mechanical properties of Y-TZP-TITANIA-TCP composites
List of Authors
  • G. Sankar , S. Meenaloshini

Keyword
  • Titanium Oxide, Tricalcium phosphate, Zirconia, Mechanical Properties, Holding Time

Abstract
  • The impact of sintering temperature, additive content and holding time on Y-TZP-TiO2-TCP composites was investigated in this research, with respect to the densification behaviour and Vickers hardness. A high-purity titanium oxide (TiO2), tricalcium phosphate (TCP) and Y-TZP composites were prepared in various wt% whereby TCP content was fixed at 15wt%, TiO2 content was varied from 0wt% to 10wt% while Y-TZP content was varied from 75wt% to 85wt%. The samples were prepared into circular discs and rectangular bars i.e uniaxially pressed at 200MPa. Then, the samples were pressureless-sintered at temperatures ranging between 1200˚C to 1400˚C with a ramp rate of 10˚C/min for 60, 90 and 120 minutes holding time. The mechanical properties: bulk density and Vickers hardness were measured and analysed. The results revealed that the higher sintering temperature and higher additive content of TiO2 played a vital role, as good contributing factors towards the enhancement of mechanical properties of this composite especially when sintered at 90 minutes holding time. The results obtained for the composition of 10wt% TiO2/15wt% TCP and 75wt% ZrO3 ceramics were 4.89Mgm-3 for bulk density and 10.67GPa for Vickers hardness, sintered at 1400˚C with 90 minutes holding time. The results show a significant contribution towards mechanical properties accelerated from the holding time and sintering temperature.

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