期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 95, 期 1, 页码 21-29出版社
SPRINGER
DOI: 10.1007/s10973-008-9065-4
关键词
bone-like apatite; dissolution kinetic; hydroxyapatite; thermal treatment
The dissolution kinetic and structural behaviour of natural hydroxyapatite (N-HA) and synthetic hydroxyapatite (S-HA) was studied vs. sintering temperature and using 'in vitro' experiments. Obtained results highlight the chemical stability of N-HA. Any structural modification was observed until 1200A degrees C. In the fact S-HA undergoes some modifications. XRD diagrams show the tricalcium phosphate (TCP) phase formation between 800 and 1100A degrees C and tetracalcium phosphate (TetCP) phase formation at 1200A degrees C. The 'in vitro' assay shows that the dissolution was occurred more in N-HA than in S-HA. The formed TCP activated the dissolution kinetic and then the precipitation phenomena when a continuous dissolution of TetCP leaded to slow down the kinetic precipitation.
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