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Sol‐Gel Synthesis of Amorphous Calcium Phosphate and Sintering into Microporous Hydroxyapatite Bioceramics
Author(s) -
Layrolle Pierre,
Ito Atsuo,
Tateishi Tetsuya
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02499.x
Subject(s) - bioceramic , materials science , microporous material , sintering , chemical engineering , amorphous calcium phosphate , crystallization , phosphoric acid , sol gel , ceramic , amorphous solid , mineralogy , nuclear chemistry , calcium , composite material , chemistry , metallurgy , organic chemistry , nanotechnology , engineering
A new route for preparing hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) bioceramic has been described. An amorphous, nanosized, and carbonate‐containing calcium phosphate powder that had a Ca:P ratio of 1.67 was synthesized from calcium diethoxide and phosphoric acid in ethanol via a sol‐gel method. The powder was pressed at 98 MPa into green specimens and then heated to a temperature range of 500°‐1300°C. At 600°C, the powder crystallized to a carbonated hydroxyapatite and a trace of ß‐tricalcium phosphate before converting to hydroxyapatite at 900°C. The thermal crystallization was associated with grain growth, shrinkage, and active surface diffusion. The activation energy of grain growth was 37 ± 2 kJ/mol. After sintering at 1100°C, the decomposition of carbonated hydroxyapatite generated a microporous ceramic with an average pore size of 0.2 µm and an open porosity of 15.5%. This microporous bioceramic can be used as a bone filler.