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- 저자 : Serdar SALMAN (검색결과 1 건)
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Serdar PAZARLIOĞLU,Serdar SALMAN 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
The phase stability, mechanical and in vitro bioactivity properties of hydroxyapatite/alumina composite with and withoutyttria were investigated. Hydroxyapatite without additives decomposed at 1300 oC to beta- and alpha-tricalcium phosphateand calcium oxide phases. Although alumina contributed to the mechanical properties of hydroxyapatite, it not only decreasedthe decomposition temperature of hydroxyapatite from 1200 oC to 900 oC and it’s in vitro bioactivity property but alsoincreased the decomposition ratio of hydroxyapatite. An improvement in the properties of hydroxyapatite/alumina compositewas provided by yttria via inhibiting the solid-state reactions between hydroxyapatite and alumina via the formation of yttriumaluminum oxide and calcium yttrium trialuminum oxide phases. The maximum fracture toughness of 2.178 ± 0.251 MPam1/2,microhardness of 4.947 ± 0.191 GPa, a compressive strength of 227.75 ± 27.87 MPa, and a three-point bending strength of90.15 ± 6.93 MPa were achieved for hydroxyapatite/alumina composite containing 1.5 wt% yttria at the sintering temperatureof 1200 oC. The relative density of 92.94 ± 0.11% was also attained. This ternary composite can potentially be used in thehuman body for load-bearing applications because of its sufficient mechanical and in vitro bioactivity properties with adecomposition ratio of 9.4%.
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