Effect of nano silica on the sinterability of hydroxyapatite dense bodies
The effects of adding a small amount of nano silica in hydroxyapatite (HA) on the sinterability and mechanical properties of hydroxyapatite were studied. The starting HA powder was synthesized using a novel wet chemical precipitation method. Different amount of silica powder was mechanically mixe...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trans Tech Publications, Switzerland
2011
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/11867/ http://irep.iium.edu.my/11867/ http://irep.iium.edu.my/11867/ http://irep.iium.edu.my/11867/4/AMR.264-265.pg1832_2_irep_ID11867.pdf |
| Summary: | The effects of adding a small amount of nano silica in hydroxyapatite (HA) on the sinterability
and mechanical properties of hydroxyapatite were studied. The starting HA powder was synthesized
using a novel wet chemical precipitation method. Different amount of silica powder was
mechanically mixed with the synthesized HA. The green samples were subsequently cold
isostatically pressed at 200 MPa. Sintering in air was accomplished by firing the green samples at
temperatures ranging from 1050°C to 1250°C. Sintered samples were analyzed to determine phase
composition and mechanical properties. The XRD analysis revealed that with increasing the amount
of silica in the HA powder, decomposition of HA to TCP occurred at sintering temperature higher
than 1050°C. The bulk density of all silica-doped samples decreased through the temperature range
studied. In agreement with the bulk density trend, the increasing silica additives in HA depleted the
Young’s modulus and Vickers hardness of the HA body. The study revealed that the addition of
silica have an adverse effect on the sintered properties of hydroxyapatite bioceramics. |
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