Painting method for hydroxyapatite coating on titanium substrate

Abstract

Abstract Coating on prostheses and implantable devices is one of the ways to increase the osseointegration of these products. However, plasma spray techniques, that are normally used, present high complexity and high cost. In this work, a new methodology for coating with nanometric hydroxyapatite is presented, with a low cost and ease of production. The technique proposed involves the formation of a suspension of hydroxyapatite (HAp) and oil of turpentine (OT) and its application, with a paintbrush, on the titanium substrate. In order to qualify the process for medical devices, the properties of the titanium substrate, before and after the coating process, the calcium phosphate phases present and the adhesive bond of the coating were evaluated. The results indicated that thermal treatment does not affect the properties of ASTM F67 titanium in order to compromise the properties and the analyses, by X-ray diffraction and Raman spectroscopy, proved that no formation of second phases of calcium phosphate occurred. The adhesive bond assay showed that the coating behaved according to ISO 13779–2, i.e., it had adhesive bond values higher than 15 MPa. The proposed new coating method proved promising for the titanium coating and is an alternative to the complex and high cost processes normally used in metal implants.