Hydroxyapatite coating on AZ91 magnesium alloy via sol-gel method

Abstract

Producing a material lighter than available biomaterials, having corrosion-resistance to biological attacks and histocompatible similar to the bone structure in order to use in biomedical applications is the purpose of this study. Lightness is extremely important in biomedical applications because stainless steel and many of the similar heavy metallic alloys can lead to infection by causing harm to tissues around the implant when it is used in the body. Although the lightness of AZ91 Mg alloy is an advantage, it is not strength enough to use in human body and it degrades in biological environment After AZ91 Mg alloy powders were pressed with unidirectional hot pressing machine under 275 MPa pressure and 320 degrees C temperature, their surfaces were coated with hydroxyapatite to provide sufficient strength and prevent the degradation of specimens using sol-gel and dip coating method with different dipping number. Then the specimens were sintered at the temperature of 400 degrees C. The surface morphologies and phase structures of coated specimens were analyzed with SEM and XRD, respectively.