Institute of Materials and Machine Mechanics
Development of a new type of biomedical bioabsorbable Zn metal matrix composites
Progressive materials and material design
Name of the supervisor
Ing. Martin Balog, PhD.
Faculty of material science and technology STU
The aim of the doctoral thesis is the development of a new generation of biomedical zinc (Zn)-based bulk metal matrix composites (MMC) fabricated by powder metallurgy (PM) approach with ultrafine-grained (UFG) structures in-situ stabilized by nanometric zincite (ZnO) dispersoids with the mechanical, corrosion and biological properties optimized for implantology namely for an application of endovascular stents and orthopedic internal fixation devices, and which address the shortcomings of contemporary bioabsorbable Zn-based materials. During the interdisciplinary work the doctoral student will be responsible for: i) fabrication and optimization of MMC preparation technologies of PM and hydrostatic extrusion, ii) complex microstructural characterisation and mechanical testing, iii) study of expected stabilizing effect induced by in-situ ZnO dispersoids into highly strained UFG Zn grain structure by a Zener pinning action, iv) study on corrosion behavior in simulated body fluids and v) in-vitro biological cell culture response incl. antibacterial effect study of Zn+ZnO MMC. The doctoral student will be required for both experimental and analytical type of research. The doctoral student will have to handle various technologies of PM, will use the methods of thermal analysis (TGA, DSC) and electron microscopy (SEM, TEM), spectrometric methods (EBSD, EDS), X-ray diffraction (XRD), mechanical (tensile tests, DMA) and fatigue and corrosion tests, at collaborative bases he/she will participate on in-vitro cell culture biological response (MTT) assays. The doctoral thesis will be supported by a research project and the student will workclosely with the BMC SAS and other foreign institutions. A previous experience in materials research, active knowledge of the English language, the ability to work in a dynamic team and independence are required.