Abstract：
:The calcination and natural sintering of calcium deficient hydroxyapatite powders Ca(10-x)(PO4)(6-x)(HPO4)x(OH)(2-x) (with 0 < or = x < or = 1) were studied. For temperature below 700 degrees C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specific surface area. This surface decreases all the more as the Ca/P molar ratio of the powder is small. The mechanism agrees with a transfer of matter occurring by superficial diffusion, which is enhanced by the augmentation of vacancies in the apatitic structure (i.e. by a decrease of the Ca/P ratio). The sintering of compacted powders begins at 700 degrees C. At the same temperature, the calcium deficient hydroxyapatites dissociate into biphasic mixtures of hydroxyapatite and tricalcium phosphate. The sintering is slowed down when the content of TCP in the biphasic mixture increases. In parallel, the grain size increases. This result relates to the augmentation of the coalescence of particles at low temperature.
journal_name
Biomaterialsjournal_title
Biomaterialsauthors
Raynaud S,Champion E,Bernache-Assollant Ddoi
10.1016/s0142-9612(01)00219-8keywords:
subject
Has Abstractpub_date
2002-02-01 00:00:00pages
1073-80issue
4eissn
0142-9612issn
1878-5905pii
S0142-9612(01)00219-8journal_volume
23pub_type
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