Abstract
Hydroxyapatite (HA) has been studied for their excellent performances which are suitable for use in bone defects or regeneration of bone. Hydroxyapatite (HA) has poor mechanical properties which make it limited used in a load bearing area. In this case, sodium alginate (SA) was used to be mixed with hydroxyapatite (HA) by using precipitation method to increase the mechanical and physical properties. The mixing of hydroxyapatite/sodium alginate effectively increases the densification and hardness of hydroxyapatite. It could contribute to the development of the artificial implants of hydroxyapatite (HA) for bone implants applications in load bearing area. The behaviors during densification were studied together with the mechanical properties of samples. The influence of mixed powder and the sintering temperature on densification, microstructure and mechanical properties of hydroxyapatite (HA)/sodium alginate (SA) composite were studied. The maximum density were attained by 99.5/0.5% (HA/SA) at 1.47g/cm3 and 1.82g/cm3 for both temperature 1000°C and 1100°C respectively while, the maximum values of hardness were also attained by 99.5/0.5% for temperature 1000°C and 1100°C at 0.053GPa and 0.266GPa respectively.
Highlights
Hydroxyapatite (HA) (Ca10(PO4)6(OH)2 is the inorganic component of bones that have excellent biocompatibility with a lot of application in biomedical fields and act as filler due to its characteristics
The Field Emission Scanning Electron Microscope (FESEM) microstructure of HA and HA/sodium alginate (SA) sintered samples are analyzed at temperature about 1000°C and 1100°C as shown in Figure 1(a) and 1(b).The particle size growth slowly as the sintering temperature increases from 1000°C to 1100°C and the particles size was in irregular shapes
This study is similar to Choi and Kumta 2006, whereby the interaction between the alginate and carbonate content incorporated into hydroxyapatite structure [8].The rapid growth of HA and hydroxyapatite/sodium alginate (HA/SA) particle size were observed in Figure 1(a) and 1 (b) for 1000°C and 1100°C
Summary
Hydroxyapatite (HA) (Ca10(PO4)6(OH) is the inorganic component of bones that have excellent biocompatibility with a lot of application in biomedical fields and act as filler due to its characteristics. These are similar to mineral component that present in bones and hard tissues [1]. The combination of ceramic based materials such as hydroxyapatite and natural polymer as sodium alginate will provide strength, stiffness and fracture toughness to the bone [2,3].The composite materials have been used in load bearing application such as filler and bone defect. Alginate (Alg) is a natural polymer which synthesized from brown algae. Sodium alginate act as a hydrophilic and it can be dissolved in water but not entirely soluble [1]
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