Porous Hydroxyapatite–Zirconia Composites Prepared by Powder Deposition and Pressureless Sintering

E. Pujiyanto; A.E. Tontowi; Muhammad Waziz Wildan; Widowati Siswomihardjo

doi:10.4028/www.scientific.net/AMR.445.463

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 445Porous Hydroxyapatite–Zirconia Composites Prepared...

Porous Hydroxyapatite–Zirconia Composites Prepared by Powder Deposition and Pressureless Sintering

Abstract:

In the present study, hydroxyapatite was synthesized from local gypsum by microwave-hydrothermal method. Different percentage amounts of zirconia (0, 20, 30 and 40 wt.%) and poly-methyl methacrylate (40, 50 and 60 wt.%) mixed with hydroxyapatite (HA) for six hours. These powder mixture were deposited using deposition machine to produce specimens. These specimens were sintered at a temperature of 140°C with holding time for 1 hour into the green parts. These green parts were sintered at temperature of 1450°C with holding time for 2 hours. This process produces porous hydroxyapatite-zirconia composites with porosity between 62.76-73.92 percent. These composites were examined by XRD, XRF, SEM-EDX, BET analysis and compressive strength testing. Compressive strength of porous hidroxyapatite-zirconia composite decreased from 3.706 to 0.039 MPa when percentage amounts of zirconia increased up to 40 wt.%. This caused by several factors i.e. increased porosity, grain zirconia cracked, zirconia reacted with HA to produce CaZrO₃, β-TCP and α-TCP, HA matrix cracks because of the phase change of tetragonal-zirconia into monoclinic-zirconia.

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Periodical:

Advanced Materials Research (Volume 445)

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463-468

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.445.463

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Online since:

January 2012

Authors:

E. Pujiyanto, A.E. Tontowi, Muhammad Waziz Wildan, Widowati Siswomihardjo

Keywords:

Porous Hydroxyapatite-Zirconia, Powder Deposition, Pressureless Sintering

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