From natural bio-resource waste to akermanite bioceramics for synthetic bone substitution
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Date
2018-06
Authors
Boey, Zhan Hei
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Abstract
Akermanite is a Si, Ca and Mg contained bio-ceramics that shows bioactive
properties in vivo and in vitro conditions. Besides, it also has good controllable
mechanical properties and degradation rate. In this study, the formation of akermanite by
using natural bio-resource waste is studied. The raw materials include cockle shell, rice
husk ash and dolomite. The starting raw materials were heat treated and then weighed
according to the molecular formula Ca2MgSiO7. The akermanite was prepared using high
energy planetary ball mill, palletized and sintered at 3 different temperature which were
1150°C, 1200°C and 1250°C for 3 hours with heating rate 5°C per minute.
Characterizations of samples were carried out by using XRD, SEM, density measurement,
shrinkage measurement. Diametral tensile strength test was also performed on the
sintered samples. XRD results showed that only akermanite peaks were identify whereas
SEM results showed that the amount of porosity decreases and the grain size increases
when sintering temperature increases. The density and shrinkage percentage increases
with the increase in sintering temperature. The compressive strength increased when the
sintering temperature increases. Among all samples, akermanite samples that was
sintered in 1250°C showed remarkable compressive strength.