Thesis topic proposal
Gabriella Vadászné Bognár
Analysis and evaluation of coating characteristics


Institute: University of Miskolc
mechanical engineering
István Sályi Doctoral School of Mechanical Engineering Sciences

Thesis supervisor: Gabriella Vadászné Bognár
Location of studies (in Hungarian): Institute of Machine and Product Design
Abbreviation of location of studies: GET

Description of the research topic:

The wear of the materials and friction of the mechanical systems have a significant economic and social impact. Wear is a phenomenon that occurs both in the mechanical degradation of materials, limiting the lifespan of machine tools, the increased risk of accidents due to breakage through wear, etc. The most critical parts of machine elements are their surfaces, in point of view of characteristic strains or environmental effects.
Advances in thin film deposition techniques during the 20th century have enabled a wide range of technological areas. Deposition techniques are categorized depending on whether the process is primarily chemical or physical.
Surface roughness has a huge impact on many important phenomena. Typical examples of spatiotemporal pattern formation in systems driven away from equilibrium can be found in physical, chemical and biological processes such as in hydrodynamic systems in pure fluids and mixtures, in patterns of solidification fronts, in optics, in chemical reactions and in excitable biological media. While on micro- and macro scales one can control the processes by special devices, on nano scales such instruments are absent or their use is extremely expensive. Therefore, the investigation of self-organization and self-assembly provide promising mode to understand basic physical principles and mechanisms. The understanding of these processes can allow us to extend the use of such technique to a large variety of fabrication processes, to create new electronic devices, sensors and tailored surfaces; moreover, to controllably modify chemico-physical properties of the surface by tailoring the nanoscale morphology during patterning and to optimize certain film properties like roughness and coarsening.

Tasks and aims:

The objective is the analysis and evaluation of the surface treatment processes (coatings), in order to elongate the life expectancy of the structure, analysis of coating technologies, wear experiments, and experiments for materials and surface pairs, as well as modelization of the wear process.
Research and optimization of surface characteristics need the presence of up-to-date methods of investigation. In order to answer these questions, fluid and thermal dynamics, surface mechanics, material science, and recent experimental and numerical methods will be used.
Based on the growth equation the better understanding of the amorphous thin film growth process is available. The temporal evolution of the surface roughness of the surface morphology with parameter will be presented. The effect of the parameter is significant on the height profile, on the mean average height profile and the surface roughness. The spatio-temporal evolution of surface morphologies will be compared with experimental data for deposition processes.

Required language skills: English
Number of students who can be accepted: 1

Deadline for application: 2020-02-28

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