Abstract
An uncalcinated carbonated amorphous calcium phosphate (CACP) compact during heating lost its absorbed and structural waters as well as volatile gases from residual by-products up to 600 °C and crystallized into a partially carbonated nanocrystalline calcium-deficient hydroxyapatite (CDHA) within 600–750 °C. The CDHA transformed into a mixture of stoichiometric HA and β-TCP (BCP) at 900 °C. These transformations in case of the preliminary uncalcinated CACP resulted in an increased density of the compact from 1.0 g cm−3 to 2.97 g cm−3, i.e., by a factor of about three. Such a high “green” density gave a ceramics of 95 % density (37/63 β-TCP/HA) for the BCP compact heated to 1000 °C practically with no holding time. This finding seems to be promising for the preparation of BCP ceramics with improved quality.
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