Project Overview
Abstract
Titanium and titanium alloys are widely used for implant manufacturing due to their mechanical performance, biocompatibility and corrosion resistance. However, the long-term stability of titanium implants depends on efficient osseointegration, while the bio-inert character of titanium surfaces can limit early bone healing. In physiological environments, titanium implants may also be affected by corrosion and wear processes generated by the combined action of body fluids, chloride ions, proteins and mechanical stress.
The BioTiC project aims to improve the biocompatibility and bioactivity of Ti6Al4V by depositing innovative phosphate layers through chemical conversion. The developed phosphating solutions are based on Zn, Zr and Sr. Zinc was selected due to its important role in osteoblast adhesion, proliferation and differentiation, while zirconium and strontium were introduced to support biological and mechanical compatibility.
Chemical phosphate conversion is a promising surface modification route because it can generate insoluble phosphate layers directly on the metallic substrate. Compared with other surface engineering methods, phosphating can provide favorable micro-nano morphological features, good adhesion to the substrate, the possibility of incorporating biologically active ions, improved corrosion and wear resistance, and a relatively low processing cost.
Project Objectives
The main objective of BioTiC is to improve the characteristics of titanium alloys used for implant manufacturing by depositing new Zr-Zn-Sr phosphate layers through the phosphating process. The project is focused on the development of original phosphating solutions and on the validation of the obtained layers on Ti6Al4V substrates.
- Design of three original phosphating solution recipes based on Zn, Zr and Sr.
- Optimization of the technological parameters of the chemical conversion process.
- Deposition of phosphate layers on Ti6Al4V substrates.
- Structural, morphological, elemental, chemical, mechanical and surface characterization of the newly deposited layers.
- Evaluation of the corrosion behaviour of the coated titanium alloy in relevant testing media.
- Dissemination and intellectual protection of the results through patent application, scientific publications and international conferences.
Methodology
The project methodology follows an integrated route that starts from the design of the phosphating solutions and continues with coating deposition, advanced characterization and dissemination of the obtained results.
Ti6Al4V samples
Substrate preparation and dimensional standardization.
Surface activation
Selection of activation and processing conditions.
Phosphating
Deposition of Zn-Zr-Sr phosphate conversion layers.
Characterization
OM, SEM/EDX, FT-IR, XRD, profilometry and mechanical tests.
Performance
Corrosion behaviour, surface response and dissemination.
Activity 1
Design, deposition and preliminary characterization
Development of phosphating solutions, selection of technological parameters, deposition of phosphate layers and preliminary OM/SEM/EDX evaluation.
Activity 2
Advanced characterization of coated Ti6Al4V
Structural, morphological, elemental, chemical, surface and mechanical characterization using OM, SEM, EDX, FT-IR, XRD, profilometry, scratch testing, microindentation, wettability and surface energy measurements.
Activity 3
Intellectual protection and dissemination
Preparation of patent documentation, publication of results and participation in international conferences and scientific events.
Expected Results
- Three original phosphating solution recipes based on Zn, Zr and Sr.
- Optimized technological parameters for the chemical conversion process.
- Innovative phosphate layers deposited on Ti6Al4V with advanced surface properties.
- Improved adhesion, corrosion resistance and wear resistance of the coated titanium alloy.
- Surface characteristics favorable for improving the biological response of titanium implants.
- At least one patent application for the developed phosphating solutions or coating route.
- At least one scientific paper published in Q1/Q2 indexed journals.
- Participation in at least two international conferences and publication of conference papers.
Project Impact
The final result of the BioTiC project targets the improvement of the biological response of titanium alloys used in implant manufacturing. The developed layers are expected to be innovative, adherent and suitable for enhancing the functional performance of titanium implant surfaces.
Scientific impact
The project contributes to the development of a highly specialized research direction focused on phosphate conversion coatings for biomaterials and titanium alloys.
Technological and economic impact
The proposed phosphating route is a low-cost and controllable surface engineering method with potential applicability to titanium-based implant materials.
Social impact
By improving implant surface response, the project may contribute to shorter patient recovery times, reduced implant failure rates and fewer inflammatory side effects.