Influence of the sintering method on densification, microstructure and electrical conductivity of 12Ce-TZP

Abstract

Zirconia containing 12 mol-% cerium oxide ceramics were prepared by solid state reaction utilising the conventional, fast firing and two-step sintering methods. The sintering temperature and time were varied aiming to determine ideal sintering profile for these methods. The monoclinic and tetragonal phase contents, microstructure and electrical conductivity of dense specimens were investigated. The linear shrinkage was found negligible up to 1100°C and the maximum rate of shrinkage was achieved at 1150°C. Densification increased up to 2 h for conventional sintered specimens. Stabilisation of tetragonal phase in non-isothermally sintered specimens occurred at a high temperature (1500°C). Specimens sintered by the two-step method attained high density along with small grain sizes. Optimised sintering profiles were determined for all the sintering methods used.

Temperature dependence in ageing process in commercial zirconia dental ceramics

“…The results are consistent with XRD data based on the crystal phase. The material does not show any significant detrimental effect of LTD at 100°C for 5 and 10 h. However, increasing the time limit may result in possible tphase to m-phase transformation consequently as reported elsewhere [1,6,17,22,32,33].…”

“…The results are consistent with XRD data based on the crystal phase. The material does not show any significant detrimental effect of LTD at 100°C for 5 and 10 h. However, increasing the time limit may result in possible t- phase to m -phase transformation consequently as reported elsewhere [1,6,17,22,32,33].

Figure 1 XRD of Samples, S0 (As received condition), S1 (Sintered at 1500°C), S2 (LTD at 100°C for 5 h), S3(LTD at 100°C for 10 h), S4 (LTD at 134°C for 5 h).

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