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CEITEC VUTZkratka: AMAk. rok: 2014/2015
Program: Advanced Materials and Nanosciences
Délka studia: 4 roky
Akreditace od: 1.1.2011Akreditace do:
Profil
The programme of Advanced materials will be focussed on advanced (functional and structural gradient, nanostructural and smart) ceramic materials, polymers, metals and composites. Basic research will be focussed on advanced methods of synthesis (or preparing) of advanced materials and multifunctional composites with polymeric, ceramic, silicate or metallic matrixes, characterization of their structures on various dimensional scales and quantifying structure-property-function relationships on the various structural levels. Combined research in the field of advanced ceramic materials, polymeric composites and metallic composites will be focussed on applications in medicine, electrical engineering, power engineering, engineering, chemistry and building engineering.
Vstupní požadavky
http://www.ceitec.vutbr.cz/en/students/admission
Garant
prof. RNDr. Jaroslav Cihlář, CSc.
Vypsaná témata doktorského studijního programu
The aim of the work are advanced syntheses of multicomponent inorganic (ceramic) nanoparticles in order to modify their bioactive properties. The effect of the particle morphology, phase and chemical composition and macrostructure modification on the bioactive properties will be studied. The bioactivity study by means of interaction with cell cultures is assumed.
Školitel: Částková Klára, doc. Ing., Ph.D.
This PhD study programme, in collaboration with the Materials for Sensors Group, will investigate novel methods for the manufacture of complex electroceramic structures for new sensor devices. Possible material configurations will include monolithic, composite and thick films.
Školitel: Button Timothy William, prof., Ph.D.
Engineering structures contain many singular stress concentrators. The most typical is sharp v-notch. Important set of singular stress concentrators represents material joints or material interfaces (surface layers, composite materials). Many further examples can be found in practice. Common characteristic of mentioned stress concentrators is their stress singularity different from 0.5 (in contrast with a crack). It means that classical approaches of linear elastic fracture mechanics cannot be used. The aim of PhD thesis is to use procedures of generalized linear elastic fracture mechanics for estimation of the moment of initial and a manner of crack propagation from general singular stress concentrator. From point of view of engineering applications the procedures derived will be used e.g. for determination of a manner of layered materials failure (material field), for determination of initial crack propagation from sharp v-notch (in structure design field) or for determination of free surface influence on fatigue crack propagation. Commercial FEM code Ansys and mathematical software Matlab will be used for necessary numerical calculations.
Školitel: Náhlík Luboš, prof. Ing., Ph.D.
Usually fatigue crack propagation is described by simple Paris-Erdogan law, where fatigue crack growth rate corresponds to stress intensity factor value. In the case of short cracks, plasticity, microstructure or free surface effects play role. The aim of the work is using numerical simulations in ANSYS software and our own experimental results find possibility of short fatigue crack fracture mechanics description. Important issue is also separation and quantification of single effects responsible for anomalous short crack behaviour.
Školitel: Hutař Pavel, prof. Ing., Ph.D.
Dissertation will be focused on the study of bioceramic materials with mechanical properties similar to those of flat and long bones. The main task will be to prepare bioceramic composites modeling the porous and dense patterns of human bones and the study of relations between synthesis, structure, morphology of bioceramic composites and their physical and biochemical properties. The work will be mainly focused on functionally graded nanostructured composites t-ZrO2/Ca-phosphates type. Besides technological issues (synthesis of composite ceramic nanoparticles, forming, sintering and machining of hydroxyapatite composites) the structure of hydroxyapatite composites, mechanical properties and biological properties (bioactivity and biocompatibility) will be studied.
Školitel: Cihlář Jaroslav, prof. RNDr., CSc.
The aim of the project is to find necessary parameters for a visual telepresence device for faithful visual telepresence and enhanced reality for medical applications, and propose and validate physiotherapeutic procedures that would use these techniques to improve the quality of rehabilitation and its quality assessment. It is supposed that stereovision, thermal imaging, resp. 3D scanning will be used. Visual telepresence is a technique, where image is transmitted to the operator so he/she should feel to be in the place where the camera system is. Enhanced reality adds other “artificial” data, e.g. thermal data, artificial objects, other measured data, to this image. The research will be utilised in medical rehabilitation or mobile robotics.
Školitel: Žalud Luděk, prof. Ing., Ph.D.
The subject of the PhD study is focused on shaping and consolidation of nanoceramic oxide particles. The main task of the student will contain a study of bulk colloidal ceramics processing using ceramic particles with size below 100 nm via colloidal shaping methods. The research will concern primarily with methods of direct consolidation of ceramic particles. A common difficulty of all these methods lies in the preparation of a stable concentrated suspension of nanoparticles with appropriate viscosity. The solution of the problem assumes understanding and utilization of colloidal chemistry and rheology of ceramic suspensions.
Školitel: Trunec Martin, prof. Ing., Dr.
The aim of this work is the study of composite catalytic systems based on transition metal oxides in particular, systems with perovskite (brownmillerite or spinel structures) in terms of their synthesis, structure and catalytic activity. Initial work will be to study the synthesis of multicomponent catalytic systems and the study of their surface and surface defects. The main objective will be to study the kinetics and mechanism of redox reactions associated with the synthesis of hydrogen. The dissertation will bring new scientific knowledge about the kinetics and mechanisms of heterogeneous catalysis in multicomponent nanoparticle catalysts that will enable in design of new heterogeneous catalysts for reformation reaction of low hydrocarbons and their derivatives to hydrogen with high efficiency.
Due to increase of the long term application of the polymer materials process of slow stable crack growth became important scientific topic. Therefore, the general goal of the work lies in the accurate description of the slow crack propagation in the case of polymeric structure under complex loading conditions taking into account residual stresses. Slow crack growth can be described by the corresponding fracture mechanics parameters and plays an important part in estimation of this life time. The correlation between experimental data of PCCL and numerical model will be presented.
Development of a model of cracked specimen loaded in shear modes using the ANSYS code. Analysis of elastic-plastic stress-strain field at the crack front deviated from the maximum shear plane under various deflection and twist angles. These unique results will enable a quantitative assessment of stability, growth kinetics and local loading modes of cracks in engineering components particularly exposed to torsion and contact loading.
Školitel: Horníková Jana, doc. Ing., Ph.D.
For detailed info please contact the supervisor.
Školitel: Jančář Josef, prof. RNDr., CSc.
The aim of the dissertation is the study of the properties of ceramic materials for high-temperature fuel cells using electrical and electrophysical methods. The focus will be on methods of impedance spectroscopy, cyclic voltammetry and load characteristics of fuel cells measurements. Recovery can also be non-linear impedance spectroscopy method, allowing the description of conductivity mechanisms.
Školitel: Novák Vítězslav, doc. Ing., Ph.D.
The dissertation will be focused on the study of thermodynamics and kinetics of electrochemical processes taking place in non-aqueous dispersions of inorganic nanoparticles. The work will be mainly focused on the synthesis of inorganic nanoparticles and composites, on the study of electrokinetic behavior of non-aqueous dispersions of nanoparticles and their rheological properties. The dissertation will bring new scientific knowledge about the kinetics and mechanisms of stabilization of inorganic nanoparticles in non-aqueous dispersions in the presence electrosteric stabilizers that will be used in the design of stable inorganic inks for printing and for electrophoretic deposition of ceramic nanoparticles.
Piezoelectric materials are key components in a wide range of sensor, actuator and transducer devices. The aim of this PhD study is to investigate the introduction of lead-free piezoelectric materials into devices at the micro-scale, using fabrication processes based on photolithography and micro-moulding.
Study of the cyclic plastic response, fatigue resistance and mechanisms of fatigue damage in materials used for demanding installations working in high temperature environment. Advanced austenitic steel type Sanicro 25 designed for high temperature will be the basic material of the study.. Principal attention will be concentrated to complex evaluation of the material subjected to variable loading with time control of the strain or stress. In addition to the standard low cycle fatigue test the attention will be devoted to the effect of the dwells in a cycle, to thermomechanical fatigue and biaxial fatigue at elevated temperatures. The aim of the work is the study of mechanisms underlying the high resistance of materials and mechanisms of their damage during various types of loading.
Školitel: Polák Jaroslav, prof. RNDr., DrSc.
The new heat-resisting Ni-based alloy MAR –M247 is started to be considered as an advanced material available for precision cast components for example in aerospace industry. The aim of PhD thesis is to explain the high-temperature creep behaviour of a MAR –M247 alloy by the determination of creep mechanisms, which control the creep deformation and fracture. The identification of relevant mechanisms will be performed by an activation analysis of creep data and microstructure investigation using SEM and TEM.
Školitel: Kvapilová Marie, Mgr., Ph.D.
Dissertation will focus on the study of biological and biochemical interactions of bioceramic materials with bone tissues in order to increase biological compatibility of bone cells with bioceramic surfaces and possibly get the tissue-bioceramic composites with long-lived biological the tissue components. First step will be to prepare and study of bioceramic composites with high biocompatibility and bioactivity containing mechanically resistant ceramic shell and biologically active phosphate component. The second step will be to study the growth of bone cell structures on the surface of bioceramic skeleton in vitro. The dissertation will bring new scientific knowledge about the interaction of bioceramic functionally gradient materials and their surfaces with bioactive bone cell cultures.
The aim of this PhD project is to manufacture and characterise lead-free piezoceramic devices based on BiNaTiO3 and compare the properties and performance with those of standard lead-based materials. A wide range of fabrication and characterisation techniques will be used. The study is part of an international collaboration.
The aim of the study is to delimit a region of mechanical stability of selected crystals under nonhydrostatic triaxial loading. For this purpose, phonon spectra will be computed for the crystals in their ground states as well as in deformed states. Phonon spectra will be obtained using force constants that will be computed by the VASP code.
Školitel: Černý Miroslav, prof. Mgr., Ph.D.
The aim of this project is to elucidate the relationships between processing conditions, structural parameters and piezoelectric properties of Pb(ZrTi)O3-based ceramics for industrial applications. This PhD study will involve close collaboration with an industrial organisation.
This work will be focused on modelling of crack growth in NiTi-type materials exhibiting a shape memory effect. Models of processes that underlie the resistance to crack propagation as the slip plasticity, the strain-induced phase transformation and the twinning will comprise an important part of the work.
Školitel: Šandera Pavel, prof. RNDr., CSc.
The aim of the work is to optimise 3D print technologies to calculate and guarantee the parameters of the resulting 3D print material. It is supposed that 3D scanning of the print during the print process and thermal imaging will be used. The key problem will be creation of a complex model of the 3D print object, including mechanical parameters and thermal propagation. This model will be used for feedback control of the printing process, as well as for resulting material parameters’ estimation.
FePd, FePt, CoPt, and other magnetic layers became extensively investigated because of their potential application in ultrahigh magnetic recording media. The aim of the study is to delimit a theoretical region of stability for selected crystals of binary alloys. Student will make a model of such crystals under simulated deformations using some of available ab initio codes. In particular, magnetic phase transitions will be studied during the deformation. Results will be compared with available literature data measured on thin films.
Vibration-based energy harvesters utilising piezoelectric ceramics are promising candidates for powering autonomous sensor systems and networks. The aim of this project is to investigate, design and develop processing methods for the manufacture of piezoelectric devices for energy harvesting applications. This will include the optimisation of material properties and characterisation of the new devices. The project will be joint with the Materials for Sensors group.
As existing structural materials reach their performance limits, one of the major scientific challenges for the 21st century is the development of new stronger and tougher lightweight structural materials. One approach in this quest for the design of new and superior structural materials is by mimicking the architecture of natural/biological materials and structures. We will emulate nature’s toughening mechanisms by combining ordinary advanced ceramic and polymers, into ice-templated structures. The aim of the Ph.D. study will be to master ice-tempating technique for preparation of hybrid ceramic materials. New technique should be adopted for relatively large samples compare with current state of art. The expected results will stimulate development of new materials directly designed for specific applications.
Školitel: Salamon David, doc. Ing., Ph.D.
The proposed topic of the work is focused on novel approach in the research and development of plasma sprayed thermal barrier coatings widely used in aerospace applications. Design and optimalization of complex technological parameters will be solved in proposed work, when the amorphous and nanocrystalline composite Al2O3-ZrO2-SiO2 + ZrO2-Y2O3 / CoNiCrAlY functional gradient coating systems will be deposited on the surface of a new generation Inconel 713LC nickel-based superalloy substrate by plasma spraying process in combination with properly designed subsequent annealing. The structural stability of these thermal barrier coatings will be studied under the fixed or variable thermal loading cycle conditions. The results of this work will also be compared with the structural stability tests provided at the same or comparable conditions on plasma sprayed thermal barrier coatings based on ZrO2-Y2O3 / CoNiCrAlY widely used in technical practice and nanocrystalline Al2O3-ZrO2-SiO2 / CoNiCrAlY which currently undergoes the development.
Školitel: Čelko Ladislav, doc. Ing., Ph.D.
The proposed topic of the work is focused on a one of the novel approaches in the development of plasma sprayed thermal barrier coatings. Design and optimization of complex technological parameters will be solved in proposed work, when the amorphous and nanocrystalline ZrO2-Al2O3-SiO2 + CoNiCrAlY functional gradient coating systems will be deposited on the surface of a new generation Inconel 713LC nickel-based superalloy substrate by plasma spraying process in combination with properly designed subsequent annealing. Moreover, the structural stability of these thermal barrier coatings will be studied under the fixed or variable thermal loading cycle conditions. The results of this work will also be compared with the structural stability tests provided at the same or comparable conditions on plasma sprayed thermal barrier coatings based on ZrO2-Y2O3 + CoNiCrAlY widely used in current technical practice.
Školitel: Švejcar Jiří, prof. Ing., CSc.
Příprava a charakterizace modifikovaných polysacharidových hydrogelů pro medicínské aplikace
Školitel: Vojtová Lucy, doc. Ing., Ph.D.
Plastic deformation of metals crystallizing in the body-centered cubic (bcc) structure, e.g. Mo, W, Nb, Ta, V, Fe, is very different from that of close-packed materials such as Cu, Al or Ni. To understand the plastic flow these materials within a wide range of temperatures and loading conditions, it is necessary to formulate a thermodynamic model of slip in bcc metals that is parametrized using the results of atomistic simulations. The currently available models do not take into account the following essential facts: (i) dependence of the dislocation energy on its orientation, (ii) significantly different mobility of edge and screw segments of the dislocation line, (iii) dependence of the Peierls barrier on the external stress, and (iv) curvilinear dislocation path connecting two stable positions in the lattice. The missing details (i)-(iii) will be obtained from atomistic simulations using semiempirical potentials such as BOP (Bond Order Potential). The solution of the problem (iv) will be accomplished using geometrical models that follow from the displacements of atoms in the neighborhood of the dislocation line.
Školitel: Gröger Roman, doc. Ing., Ph.D. et Ph.D.
The localization of the cyclic plastic strain in persistent slip bands (PSBs) is a typical and very important feature in fatigue damage process of crystalline materials leading to the evolution of surface relief consisting of extrusions and intrusions and subsequently to transcrystalline fatigue crack initiation. The aim of the study will be experimental examination of (i) surface relief evolution during cycling at different temperatures, (ii) the PSB slip activity in half- and full loading cycle within individual grains of a polycrystal and its evolution during fatigue life and (iii) dislocation structures of PSBs and surrounding matrix. High-resolution techniques – scanning electron microscopy (SEM–FEG), atomic force microscopy (AFM) simultaneously with electron backscattering diffraction (EBSD) method and in situ fatigue tests within a SEM–FEG chamber will be adopted for two polycrystalline metals – 316L austenitic stainless steel and copper. Early stages of evolution of dislocation structures of PSBs will be studied using transmission electron microscopy (TEM) and electron channelling contrast imaging (ECCI). Experimental data on the half- and full cycle slip activity as well as the local shear strain amplitudes and their distribution in PSBs will be obtained. Quantitative data on the kinetics of extrusion and intrusion growth at various temperatures allows checking of theoretical models of surface relief formation and fatigue crack initiation and elucidation of the role of point defects in these processes. Experimental results obtained advance our understanding of fundamental micromechanisms of fatigue crack initiation.
Školitel: Man Jiří, Ing., Ph.D.
The work will be focused on experimental determination of fatigue strength, crack growth rates and thresholds in NiTi shape memory alloys under push-pull, torsion and combined cyclic loading at room temperature. The multiaxial servo-hydraulic pulsator Industar-M will be utilized in these fatigue experiments. Crack initiation sites and crack-growth paths will be studied in SEM using stereophotogrammetry of fracture surfaces.
Školitel: Pokluda Jaroslav, prof. RNDr., CSc.
The project is concerned with a systematic study of the influence of processing conditions on the physical, structural, microstructural and piezoelectric properties of material compositions in the barium zirconium titanate – barium calcium titanate solid solution system. The aim will be to identify candidate materials which could be adopted as environmentally friendly replacements for current piezoelectric materials based on lead zirconate titanate.
The main goal of the thesis will be the tailoring the microstructure of advanced ceramics through the proper choice of sintering regime. Various experimental approaches (conventional sintering as well as non-conventional sintering like Spark Plasma Sintering, Microwave Sintering, Hot Isostatic Pressing etc.) will be studied and compared with the final aim to find the optimal way for processing of ceramics with improved microstructure and therefore improved structural and functional properties.
Školitel: Maca Karel, prof. RNDr., Dr.
The aim of the dissertation is the study of composite reducible transition metal oxides with perovskite or defective spinel structures in terms of stability of phase and chemical composition during repeated redox processes. The work will be focused on the synthesis of oxide nanoparticles and their (cationic and anionic) doping, and the study of their structure. The main part of the work will involve studies of cyclic oxidation and reduction of oxide nanoparticles, the study of surface defects and the mechanism of their formation, locating the active sites for heterogeneous catalysis and testing their activity in model reactions. The dissertation will bring new scientific knowledge about the molecular structure of reducible composite oxides and kinetics and mechanisms of redox processes on their surface.
The work is focused on the study of photoactive properties of ceramic materials using impedance and photoimpedance spectroscopy. These methods allow a detailed description of the mechanisms and subsequent optimization of the composition of the studied materials.
The doctoral thesis is focused on study of advanced thermal barrier coatings behavior after thermo-mechanical cyclic loading tests. To metallographic and fractographic evaluation will also be applied recent conventional available materials testing methods.
Školitel: Podrábský Tomáš, prof. Ing., CSc.
For detailed info please contact the supervisor
Study of selective ceramic nanoparticles linking by photopolymer composition for ceramic prototypes manufacturing on special 3D printer (Lithography based Ceramic Manufacturing). The photochemical processes of photopolymer crosslinking initialised by UV light will be studied. This photochemical reactions leads to selective connections of nanoparticles to patterned ceramic layers or 3D ceramic body. The physical and chemical properties of prepared ceramic layers will be studied.
Školitel: Veselý Michal, prof. Ing., CSc.