title: A new titanium based alloy Ti-27Nb-13Zr produced by powder metallurgy with biomimetic coating for use as a biomaterial.
abstract: Titanium alloys are widely used in biomedical applications due to their excellent properties such as high strength, good corrosion resistance and biocompatibility. Titanium alloys with alloying elements such as Nb and Zr are biocompatible and have Young's modulus close to that of human bone. To increase the bioactivity of titanium alloy surfaces is used chemical treatment with NaOH followed by immersion in simulated body fluid (SBF). The purpose of this study was to produce the alloy Ti-27Nb-13Zr with low Young's modulus by powder metallurgy using powders produced by the HDH process. The formation of biomimetic coatings on samples immersed in SBF for 3, 7, 11 and 15 days was evaluated. Characterization of the coating was performed by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and scanning electron microscope. The microstructure and composition of the alloy were determined using SEM and XRD, while the mechanical properties were evaluated by determining the elastic modulus and the Vickers microhardness. The sintered alloys were composed of α and β phases, equiaxed grains and with density around 97.8% of its theoretical density. The Vickers microhardness and elasticity modulus of the alloy were determined and their values indicate that this alloy can be used as a biomaterial. Analysis of the coating revealed the presence of calcium phosphate layers on samples immersed for >3 days in the SBF solution.
authors.affiliation: Materials Science and Technology Center, Energy and Nuclear Research Institute, Av. Lineu Prestes 2242, C.P: 05508-000 São Paulo, SP, Brazil. Electronic address: mwdmendes@ipen.com.
authors.forename: Marcio W D
authors.initials: MW
authors.lastname: Mendes
authors.affiliation: Materials Science and Technology Center, Energy and Nuclear Research Institute, Av. Lineu Prestes 2242, C.P: 05508-000 São Paulo, SP, Brazil.
authors.forename: Carola G
authors.initials: CG
authors.lastname: Ágreda
authors.affiliation: Materials Science and Technology Center, Energy and Nuclear Research Institute, Av. Lineu Prestes 2242, C.P: 05508-000 São Paulo, SP, Brazil.
authors.forename: Ana H A
authors.initials: AH
authors.lastname: Bressiani
authors.affiliation: Materials Science and Technology Center, Energy and Nuclear Research Institute, Av. Lineu Prestes 2242, C.P: 05508-000 São Paulo, SP, Brazil.
authors.forename: José C
authors.initials: JC
authors.lastname: Bressiani
mesh_terms: D000497:Alloys / Q000737:chemistry*; D032701:Biomimetics; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D055119:Elastic Modulus; D008855:Microscopy, Electron, Scanning; D009556:Niobium / Q000737:chemistry; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D009556:Niobium; D015040:Zirconium; D014025:Titanium
keywords: Apatite coating; Titanium alloy; Ti–Nb–Zr; Young's modulus; powder metallurgy