B. Aksakal, O.S. Yildirim, A. Okur, and H. Gul (Turkey)
: Biomaterials, Dip Coating,, Hydroxyapatite, Adhesive strength
The focus of the present study is based on a more economical coating of the most common implant substrates used in orthopedics. For this, as inorganic phase of ceramic dip coating of implant substrates, calcium hydroxyapatite, Ca10(PO4)6(OH)2, powder was produced chemically from calcium hydroxide dissolved in aqueous solutions. The formation of calcium hydroxyapatite (HA) powder has been confirmed by X-ray diffractometry (XRD) analyses. To provide a dipping sol, first produced HA powder with ethanol was grinded in a grinding machine, for gelation then homogenized in ultrasonic homogenizer. Before the dipping process Ti-6Al-4V and 316L substrates were sandblasted, a homogeneous thin film of HA was successfully deposited easily onto metal substrates by using a newly manufactured dip-coating aparatus. Coated sample characterization are evaluated by SEM, and XRD analysis. A homogeneous coating layer and 20-25MPa adhesive strengths have been achieved between the coating layer and metal substrates of both 316L and Ti-6Al-4V alloys after sintering at 7500 C under flowing argon. Hardness tests took place and showed an increase with increasing sintering temperature.
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