Processing and properties of calcium phosphates bioceramics by hot isostatic pressing
1 Belgian Ceramic Research Centre (BCRC-EMRA), avenue gouverneur Cornez 4, 7000 Mons, Belgium
2 Laboratoire des Matériaux Céramiques et Procédés Associés (LMCPA), Université Lille-Nord de France, 59800 Lille, France
3 UVHC, ZI Champ de l'abbesse, 59600 Maubeuge, France
Stoichiometric β-tricalcium phosphate (β-TCP), hydroxyapatite (HA) and biphasic calcium phosphate (TCP/HA 60/40 %wt, BCP40) powders were synthesized by chemical precipitation of aqueous solutions of diammonium phosphate and calcium nitrate. After a calcination treatment and a milling step, powders were shaped by slip-casting. The sintering temperature effect on the density and the average grain size was investigated. By natural sintering, densities between 98 and 99.8% were obtained. Hot Isostatic Pressing (HIP) treatment was carried out after a pre-sintering of these materials. Transparent or translucent samples were obtained, indicating a relative density very close to the theoretical value (>99.9%). Mechanical properties (three-point bending strength, fracture toughness, Young's modulus and Vickers hardness) were measured on hipped materials with similar grain size (∼0.7μm).
© Owned by the authors, published by EDP Sciences, 2013
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