Study on the influence mechanism of sintering hydroxyapatite (HA)
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As one of promising biomaterial, hydroxyapatite (HA) is potentially used as an implant component. Yet, to date, HA stillencounter difficulties to be comerciallise due to the easily deteriorate and often fluctuate mechanical performance whichdepends on the manufacturing process. Thus, this study aims to experiment the influence of HA composition and sinteringparameter on the densification, morphological analysis and flexural strength in terms of green parts and sintered HA. The HAparts are fabricated through the powder injection moulding process with the pressure applied between 10 and 12 bar at 150 oC. The HA compositions are varied of 54 wt.%, 55 wt.% and 56 wt.% while the sintering parameter are set at 1,100 oC, 1,200 oCand 1,300 oC. The 56 wt.% of HA parts recorded the densification of 2.13 g/cm3 and 2.95 g/cm3 for both green parts andsintered parts at 1,300 oC. However, as the sintering temperature reduced to 1,200 oC, the densification reached the value of2.9 g/cm3 with the existence of porous structure to allow tissue growth. This finding suggested that the HA parts can be massproduce using powder injection moulding process at 1,200 oC, with a minimum existence of porosity to allow tissue growth inbetween the HA structure.
Abstract
As one of promising biomaterial, hydroxyapatite (HA) is potentially used as an implant component. Yet, to date, HA stillencounter difficulties to be comerciallise due to the easily deteriorate and often fluctuate mechanical performance whichdepends on the manufacturing process. Thus, this study aims to experiment the influence of HA composition and sinteringparameter on the densification, morphological analysis and flexural strength in terms of green parts and sintered HA. The HAparts are fabricated through the powder injection moulding process with the pressure applied between 10 and 12 bar at 150 oC. The HA compositions are varied of 54 wt.%, 55 wt.% and 56 wt.% while the sintering parameter are set at 1,100 oC, 1,200 oCand 1,300 oC. The 56 wt.% of HA parts recorded the densification of 2.13 g/cm3 and 2.95 g/cm3 for both green parts andsintered parts at 1,300 oC. However, as the sintering temperature reduced to 1,200 oC, the densification reached the value of2.9 g/cm3 with the existence of porous structure to allow tissue growth. This finding suggested that the HA parts can be massproduce using powder injection moulding process at 1,200 oC, with a minimum existence of porosity to allow tissue growth inbetween the HA structure.
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