Characterization And Properties Of Synthesized And Sintered Carbonated Hydroxyapatite
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Date
2011-05
Authors
Baba Ismail, Yanny Marliana
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
B-type Carbonated Hydroxyapatite (CHA) was successfully synthesized via
nanoemulsion method, through dropwise (DW) and direct pouring (DP) techniques.
The carbonate content in DP (8.60%) was higher than DW (7.85%). Both techniques
produced nano-sized powders with variation in shapes of particles. It was also found
that at temperature (≤ 40°C), the CHA powders were angular while above this
critical temperature mixture of rods and angular shape was produced. Room
temperature synthesis was better as they produced nano-size CHA with larger surface
area. Sintering was then performed on pure CHA, CHA+Mg(OH)2, HA and
HA+Mg(OH)2, samples which was cooled down with and without wet CO2
atmosphere to produce different type of carbonate substitution in the structure. Pure
B-type CHA was successfully retained when pure CHA and CHA+Mg(OH)2 was
sintered at 700-900°C, with the latter reaching optimum densification at temperature
of 800°C (CM2C). Other samples required higher temperature for densification. The
carbonate content was also different with CM2C having highest 4.30 wt%. AB-type
CHA and A-type CHA was formed for densest sintered samples using HA+Mg(OH)2
and HA as starting material. The use of Mg(OH)2 had successfully reduce the
sintering temperature and improve the densification of the sintered samples through
Liquid-Phase Sintering. The use of wet CO2 atmosphere was successfull to
compensate the carbonate loss during sintering. The hardness, K1c, and DTS values
obtained for densest CM2C were 2.37 GPa, 3.27 MPa.m1/2, and 22.95 MPa,
respectively, and shows a better bioactivity by rapid formation of apatite crystals.
Thus, an enhancement of sintered CHA properties was successfully achieved in this
study.
Description
Keywords
B-type Carbonated Hydroxyapatite was successfully , synthesized via nanoemulsion method