Synthesis of bioactive coatings based on high entropy oxides using the micro-arc oxidation of a metal matrix composite

• Grant number: 24/14878-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2024
• End date: December 28, 2025
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Diego Rafael Nespeque Correa
• Grantee: Samuel Phelippe Bonetti
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
• Associated research grant: 24/03148-3 - Biofunctionalization of biomedical Ti-based alloys using micro-arc oxidation and the concept of high entropy oxides, AP.R
• Associated scholarship(s): 25/02091-0 - Exploring the mechanical properties at the nanoscale of MAO-treated titanium matrix composites reinforced with oxide particles, BE.EP.IC

Abstract

The present study focuses on developing a new metal matrix composite from commercially pure titanium grade 2 and metal oxides of interest to the biomedical field (TiO2, Al2O3, MoO3, MnO2, and Fe2O3) as reinforcement. The composite will be formed by argon arc-melting, with a mixture of oxide particles in the proportion of 5% volumetric to titanium. The composite will subsequently be subjected to a surface treatment by micro-arc oxidation (MAO) to improve its biofunctionality by forming porous high-entropy oxides (PHEOs). The MAO process will allow the incorporation of bioactive ions on the surface of the alloy, encouraging osseointegration and bone regeneration. For this purpose, the electrolyte used in the MAO process will be composed of bioactive chemical species, such as calcium (Ca), phosphorus (P), and magnesium (Mg). The project will encompass a detailed study of the chemical, physical, and structural characteristics and a preliminary evaluation of the mechanical, electrochemical, tribological, and biological properties of the bulk and surface. Finally, the project is expected to develop a new metal matrix composite with porous HEO-type coatings, with promising properties for use as biofunctional biomedical implants, with improved performance for the treatment of trauma and injuries to bones and joints in the human body.