Improving microhardness and wear properties by surface modification on Ti-34Nb-6Sn system by plasma electrolyte oxidation

Author(s)

Rossi, Mariana ; Kuroda, Pedro ; Danelon, Miguel Rubira ; Rossino, Luciana Sgarbi ; Afonso, Conrado R. M.

• Document type: Journal article
• Source: Materials Letters; v. 370, p. 5-pg., 2024-06-14.

Abstract

The plasma electrolyte oxidation (PEO) coating technique was used to fabricate a ceramic porous layer on the surface of beta Ti-34Nb-6Sn alloy in a phosphate, calcium, and magnesium electrolyte (bioactive elements). The phase composition and microstructure of the substrate Ti-34Nb-6Sn (TNS) alloy was made by XRD essay and the PEO coatings were characterized by XRD and SEM analyses. The microhardness was done by Vickers microhardness and the wear assay was made by micro-abrasive wear technique. The oxide coatings can be effectively fabricated on the surface of this alloy. The pore size showed a variability and the maximum and minimum pore size values found were 2.98 mu m and 0.42 mu m. The PEO coatings comprised anatase and rutile TiO2, Nb2O5 and SnO oxides. The hardness and wear properties were compared to the CP-Ti substrate. The hardness of the oxide surface coating increased significantly when compared to the metallic substrates. The wear resistance was improved after PEO-coating on CP-Ti compared to untreated material, and the treatment established the wear behavior of the TNS alloy. The improvement of the hardness, and wear resistance of the TNS alloy can be related to the oxides formed during the PEO treatment and can contribute to the development of biomedical devices advancing the biological properties when in contact with the bone tissue. (AU)

• FAPESP's process: 23/04654-7 - Tribological and ion release study of low elastic modulus in beta Ti alloys modified by anodizing and MAO
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 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
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/26517-6 - Influence of the microstructure and phases on surface functionalization of beta Ti-25Ta-xZr- alloys system
• Grantee: Pedro Akira Bazaglia Kuroda
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants