MECHANICAL PROPERTIES OF CARBONATED BIOMIMETIC NANOCRYSTALLINE APATITE COATINGS OBTAINED BY COLD SPRAY

In recent years, a few attempts have been made to produce hydroxyapatite (HA) coatings by Cold Spray. In contrast to plasma spray, this technique uses supersonic gas jet and no particles melting, interesting to avoid decomposition. Moreover, many bioactive raw materials were developed and exhibit high biological properties compare to HA due to the reactivity and metastability which limit the temperature of processing. Recently, Cold Spray Technic was successful to obtain homogeneous new promising coatings: carbonated Biomimetic Nanocrystalline Apatite (BNAc) coatings. These coatings, metastable and similar to mineral bone, exhibit rather a good physico-chemical agreement to the apatite powder and required adhesion for target application. For the first time, the bond strength of BNAc coatings was evaluated using different tensile adherence tests whose one is according to the medical standard ISO 13779-4. Cold sprayed BNAc coatings hold tremendous potential for improving bone integration of a wide range of medical implants.