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Fabrication and Characterization of Hydroxyapatite/Mullite and Tricalcium Phosphate/Al2O3 Composites Containing 30 wt% of Bioactive Components
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 Title & Authors
Fabrication and Characterization of Hydroxyapatite/Mullite and Tricalcium Phosphate/Al2O3 Composites Containing 30 wt% of Bioactive Components
Ha, Jung-Soo;
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Mullite-matrix and -matrix composites were fabricated with 30 wt% hydroxyapatite (HA) and tricalcium phosphate (TCP), respectively, as additives to give bioactivity. A diphasic gel process was employed to lower the densification temperature of the mullite matrix to . A polymer complexation process was used to synthesize a TCP powder that was fully densified at , for application to the matrix. For the HA/mullite composite, HA decomposed during sintering by reactions with the matrix components of and , resulting in a mixture of , TCP, and other minor phases with a low densification of less than 88% of the theoretical density (TD). In contrast, the TCP/ composite was highly densified by sintering at to 96%TD with no reaction between the components. Different from the TCP monolith, the TCP/ composite also showed a fine microstructure and intergranular fracture, both of which characteristics are advantageous for strength and fracture toughness.
Hydroxyapatite;Mullite;Tricalcium phosphate;;Composites;
 Cited by
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