Tribological and ion release study of low elastic modulus in beta Ti alloys modified by anodizing and MAO

• Grant number: 23/04654-7
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: February 01, 2024
• End date: September 30, 2024
• Field of knowledge: Interdisciplinary Subjects
• Principal Investigator: Conrado Ramos Moreira Afonso
• Grantee: Mariana Correa Rossi
• Supervisor: Vicente Amigo Borras
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Institution abroad: Universitat Politécnica de Valéncia (UPV), Spain
• Associated to the scholarship: 21/03865-9 - Influence of surface modifications on bioactivity and (tribo) corrosion of beta Ti-Nb-(Zr) alloys with low elastic modulus for application as implant, BP.PD

Abstract

This work aims to evaluate the tribocorrosion resistance of beta-type Ti alloys after surface modification by MAO and anodization. The alloys to be evaluated will be Ti-cp (alpha), Ti15Nb (alpha' + beta), TN-25 (alpha"), TN40 (beta-stable) TNZ33 (beta-metastable) and TNZ40 (beta stable). According to preliminary studies, it was possible to find differences in the formation of the oxide layer in the two types of modification, the main ones are: size, chemical composition and homogeneity of the micropores, length and diameter of the nanotubes. Since these differences were governed by the content of alloying elements (Nb and Zr). The tribocorrosive behavior will be investigated using an alumina sphere of 4 mm in diameter and varying the oscillation frequency (1, 2 and 3 Hz) along with different types of electrolytes (NaCl, SBF, PBS). At the end of each experiment, the surfaces will be evaluated by a SEM-EDX and the surface wear volume will be determined by profilometry, performing a three-dimensional mapping for the complete study of the wear of the materials. The final solution of each experiment will be evaluated for the release of Ti, Nb and Zr particles after the tribological tests. It is expected to obtain information on the influence of the different coatings obtained by MAO and anodization from the microstructure and chemical composition of the beta alloys on the resistance to tribocorrosion for potential biomedical application. (AU)