| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === Having good bio-compatibility and bio-resorption, both calcium phosphate and calcium sulfate conceded their own advantage and disadvantage in the areas of human implantation. In the study, DCPD (dicalcium phosphate dihydrate) and TCP (β tri-calcium phosphate) powders are mixed with equally weight ratio as bony cements were invested systematically. Variation of amounts of calcium sulfate is added into the above CPC (calcium phosphate cement) while using de-ionized water as binder. The composites are analyzed for their harden time, physical properties, mechanical properties, and microstructure. Followed, the characterization of specimens is carried out in the simulated body fluid immersing solution for each interval. The results showed that shorten the harden time and decreased the porosity would enlarge the diametric compressive strength by increasing the added amount of calcium sulfate and decreasing the liquid water content of the composites. The microstructures also indicated that formation of hydroxyapatite is observed on the surfaces of specimens when calcium ions and phosphate ions reach to a saturated concentration.
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