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논문 기본 정보

자료유형
학술저널
저자정보
M. Amiri Roudan (University of Malaya)
저널정보
한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제18권 제1호
발행연도
2017.1
수록면
69 - 72 (4page)
DOI
http://dx.doi.org/

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In the present work, hydroxyapatite (HA) derived from calcined eggshell via a wet chemical precipitation method wasinvestigated. The as-received eggshells was calcined at 900 oC to produce crystalline calcium oxide which reacted withorthophosphoric acid under controlled conditions. The final solution was filtered, dried and sieved to obtain ready to press,phase pure hydroxyapatite powder as confirmed by X-ray diffraction (XRD) analysis. Green samples were prepared andsintered in air at various temperatures ranging from 900 oC to 1300 oC at a ramp rate of 10 oC per minute and 1 hr holdingtime. The sintered samples were evaluated in terms of HA phase stability, relative density, grain size, Vickers hardness andfracture toughness. The results showed that the HA phase remained stable even after sintering at 1300 oC. In addition, the relativedensity, Vickers hardness and fracture toughness were found to increase rapidly between 900 to 1100 oC and reached a plateauthereafter. A relatively density of 98.5%, high Vickers hardness of 5.9 GPa and fracture toughness of 1.09 MPam1/2 was achievedat 1250 oC despite having a large grain size of 2.5 μm at this temperature.

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