Volume : IV, Issue : V, May - 2014

Thermal Stability and Sintering Behaviour of Hydroxyapatite and Zirconia

Dr M. K. Hilal

Abstract :

The aim of this study was to investigate the thermal stability and sintering behaviour of two hydroxyapatite and two zirconia powders, using the powder press technique. two powders of hydroxyapatite and zirconia were studied. Compacts of HAp (PB), formed by powder pressing and fired at a sintering temperature ranging from 1100 to 1500o C for 3 h for HAP and for 6 h for Zirconia, HAp(PB) could be sintered to high densities and did not dehydroxylate and/ or decompose into TCP, whereas for HAp (EC) dehydroxylation and decomposition occured at lower sintering temperature than HAp (PB). A major difference was observed in the rate of densification. Densification of the ZrO 2 does not begin to take place to any great degree until sintering temperatures in excess of 1350o C are used, when employing a simple cold powder pressing (Figure 8.22). Further increasing the sintering temperature resulted in an increase in the theoretical density and linear shrinkage (Figure 8.23). The corresponding increase in biaxial flexural strength values (Figure 8.24), is thus primarily due to the densification process and secondly due to particles size distribution and transformation toughening mechanism of zirconia which was confirmed by XRD and DTA data. The BFS of ZrO 2 (U) is higher than that of ZrO 2 (M) because ZrO 2 (U) densified more than ZrO 2 (M) and that is related to the particles size distribution of ZrO 2 (U) which is smaller than ZrO 2 (M). However, statistically there is no significant difference in relation to the BFS between the two zirconia powder they behave in similar manner.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Dr M. K. Hilal Thermal Stability and Sintering Behaviour of Hydroxyapatite and Zirconia Indian Journal of Applied Research, Volume.4, Issue.5, May-2014

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