Fine structure analysis of biocompatible ceramic materials based hydroxyapatite and metallic biomaterials 316L

• Published in: Applied surface science 2013-11, Vol.285, p.65-71
• Main Authors: Anghelina, F.V., Ungureanu, D.N., Bratu, V., Popescu, I.N., Rusanescu, C.O.
• Format: Article
• Language: English
• Subjects: AISI 316L; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Coprecipitation method; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; HAp nanopowders; Physics; Second residual stresses; SEM; XRD
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.06.102

•Surface morphology and fine structure of hydroxyapatite powder (HAp) and AISI316L were used as biomaterials.•Identification of the phases of HAp synthesized by coprecipitation, determination of crystalinity degree and average size of crystallites by XRD.•Study of second residual stress profiles of 316L samples by WAXD for different machining regimes.•SEM analysis of sparking spots of 316L and the morphology of HAp depending on the variation of heat treatment parameters. The aim of this paper was to obtain and characterize (surface morphology and fine structure) two types of materials: Ca10(PO4)6(OH)2 hydroxyapatite powder (HAp) as biocompatible ceramic materials and AISI 316L austenitic stainless steels as metallic biomaterials, which are the components of the metal–ceramic composites used for medical implants in reconstructive surgery and prosthetic treatment. The HAp was synthesized by coprecipitation method, heat treated at 200°C, 800°C and 1200°C for 4h, analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The stainless steel 316L type was made by casting, annealing and machined with a low speed (100mm/s) in order to obtain a smooth surface and after that has been studied from residual stresses point of view in three polishing regimes conditions: at low speed polishing (150rpm), at high speed polishing (1500rpm) and high speed-vibration contact polishing (1500rpm) using wide angle X-ray diffractions (WAXD). The chemical compositions of AISI 316 steel samples were measured using a Foundry Master Spectrometer equipped with CCD detector for spectral lines and the sparking spots of AISI 316L samples were analyzed using SEM. By XRD the phases of HAp powders have been identified and also the degree of crystallinity and average size of crystallites, and with SEM, we studied the morphology of the HAp. It has been found from XRD analysis that we obtained HAp with a high degree of crystallinity at 800°C and 1200°C, no presence of impurity and from SEM analysis we noticed the influence of heat treatment on the ceramic particles morphology. From the study of residual stress profiles of 316L samples were observed that it differs substantially for different machining regimes and from the SEM analysis of sparking spots we revealed the rough surfaces of stainless steel rods necessary for a better adhesion of HAp on it.