KJ Ceramics 31

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Detailed Program

Paper Number : SY-P04

Time Frame : 12:00~13:30

Presentation Date : Thursday, 27, November

Session Name : Synthesis, Raw Materials & Advanced powder processing

Session Chair 1# : -

Session Chair 2# : -

Synthesis of Hydroxyapatite Using Room-temperature Reaction between Egg Shell and Phosphoric Acid

Mr. Taesung Kang

Mokpo National University

Hydroxyapatite and -tricalcium phosphate are very well known ceramic materials because of their high biocompatibility and they can be used for artificial bones for transplants or even help in regenerating pre-existent bone structures. For the synthesis of these materials the precursors can react with each other in an aqueous solution or they can be combined in solid phase and react during a heating process at high temperatures. In this study, to find the conditions on how to synthesize hydroxyapatite, which is a calcium phosphate based bio-ceramic material, at lower temperature we combined calcined egg shells with various concentrations of phosphoric acid. The very fine CaO powder, made from calcined egg shells that have a high surface area of 31.6 m2/g, shows a high reactivity with phosphoric acid. The powder was combined with various concentrations of the acid at room temperature and the resulting reaction was highly exothermic. After the reaction the samples showed both CaOH and CaHPO4 crystal phases. In order to observe the changes in crystal phase, the samples were afterwards heat treated at various temperatures. After varying the heating temperature and the concentration of the phosphoric acid, most of the samples had as a major crystal phase the CaHPO4, and only one of the samples displayed the formation of the hydroxyapatite crystal phase.

Acknowledgements :

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