653-2009/01 – Nanotechnologies (NT)
Gurantor department | Department of Materials Engineering and Recycling | Credits | 5 |
Subject guarantor | doc. Dr. Ing. Monika Losertová | Subject version guarantor | doc. Dr. Ing. Monika Losertová |
Study level | undergraduate or graduate | Requirement | Choice-compulsory type B |
Year | 3 | Semester | winter |
| | Study language | Czech |
Year of introduction | 2022/2023 | Year of cancellation | |
Intended for the faculties | FMT | Intended for study types | Bachelor |
Subject aims expressed by acquired skills and competences
Student will be able:
- to define perspective groups of nanomaterials.
- to describe and characterize the application areas of nanomaterials.
- to classify and clarify nanomaterial processing technologies.
- to choose optimal metallurgical processes for the production of nanomaterials.
- to evaluate and apply knowledge from nanomaterials preparation by intensive forming methods.
Teaching methods
Lectures
Seminars
Tutorials
Experimental work in labs
Project work
Summary
Předmět je zaměřen na charakteristiku vlastností a procesů přípravy jednotlivých typů nanostrukturních materiálů:
Metody syntézy nanostrukturních materiálů (kondenzace, mechanické mletí a legování, prášková metalurgie, rozprašování
suspenzí, elektrodepozice, devitrifikace amorfních fází apod.). Dále budou charakterizovány jednotlivé technologické
postupy aplikované v technické praxi: Chemické metody přípravy nanomateriálů, pulzní laserové metody, pyrolýzní
metody, aplikace vysokofrekvenčně generované plazmy. PVD, CVD, epitaxe. Nové poznatky z výzkumu nanotechnologií
a nanostrukturních materiálů se zaměřením na jejich konstrukční využití. Technologie výroby polykomponentních
kovových materiálů se základními stavebními jednotkami (rozměry, tvar, struktura, mezifázové rozhraní) menšími
než 100 nm. Pozornost je věnována technologiím, které jsou založeny na velkých plastických deformacích (SPD) a
řízených podmínkách tváření. Je prezentován vliv nekonvenčních technologií tváření ECAP (Equal Channel Angular
Pressing), High-Pressure Torsion (HPT), CEC (Cyclic Extrusion Compression), TC (Torsion with Compression), Continuous
Confined Strip Shearing (C2S2), Continuous DECAP, Conshearing (CS), Semi-solid Casting (tixoforming) na strukturu
a mechanické vlastnosti kovových konstrukčních mikro- a nanomateriálů. Homogenita deformace v ultrajemnozrnných
a nanostrukturních kovových materiálech připravených extrémní plastickou deformací. Stanovení napětí a deformaci
u jednotlivých SPD technologií. Superplastické chování ultrajemnozrnných a nanostrukturních materiálů. Příprava
nanostrukturních materiálů na bázi Ti a slitin Ti pro aplikace v medicíně.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
Credit test.
E-learning
Other requirements
semestral project, lab works
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Characteristics of nanostructured materials, size and specific surface area of particles. Influence of material properties by the ratio of atoms in the volume and on the surface of the particles. Basic types of nanostructured materials and their applications.
2. Methods of preparation of nanostructured materials and their classification. Preparation of nanostructured materials from different phases (gas, liquid, aqueous solutions, suspensions, solid phases). Possibilities of preparation of nanostructured materials.
3. Preparation of nanostructured materials by condensation from inert gases. Preparation of nanostructured materials by PVS (Physical Vapor Synthesis). The reaction of the reaction gases with the vapor precursor. Effect of preparation conditions on properties.
4. Plasma processes of the preparation of nanostructured materials. Plasma characteristics, induction and arc plasma. Generation of plasma, evaporation and condensation of material. Chemical synthesis, pyrolysis processes.
5. Preparation of nanostructured materials by NAS (Nano Arc Synthesis). Utilization of arc discharge energy for the preparation of single-component and multi-component oxides of rare earth metals and transition metals. Methods of preparation of carbon nanostructured materials.
6. Methods for the preparation of solutions, microemulsions, aerosols, for the preparation of nanostructured and nanocomposite materials, mixed crystal compounds. Single-component and multi-component systems (WCo, WCoV, WCoCr2C3, etc.).
7. Preparation of nanostructured materials for fast melt solidification processes. Effect of melt chemical composition and cooling rate on structure and particle size. Preparation of fine-grained materials by atomization of metal melts using high-speed inert gas, influence of atomization conditions and melt composition on material structure.
8. Preparation of nano-structural materials by milling process in high-energy ball mills. Preparation of multi-component materials by the process of mechanical alloying (TiC, TiB2, ...).
9. Methods for evaluation of properties of nano-structural materials. Determination of size of particles, mechanical properties, evaluation of properties of thermally sprayed coatings and surface layers. Structural characteristics. Mechanical properties of nano-crystalline metals. Change of the properties of metallic materials in dependence on the grain size. Super-plastic behaviour.
10. Deformation of metals and alloys (elastic, plastic), methods for determination of plastic deformation (absolute, relative, true strain, deformation coefficients, the law of constancy of the volume). Analysis of plastic deformation performed by the SPD technology using computer simulation. Properties of metallic materials and nano-structural materials (Hall-Petch equation, strength, ductility, grain growth).
11. Technologies: Top-down, Bottom-up, SPD – UFG and NC material (ultra-fine grained and nano-structural materials).
12. Severe Plastic Deformation (SPD), methods for preparation of nano-crystalline metals: High-pressure torsion (HPT), Equal channel angular processing (ECAP, DECAP), Cyclic extrusion-compression (CEC), Accumulative roll-bonding (ARB), continuous processes (Conshearing, C2S2, CSPD) and tixoforming.
13. Basic thermodynamic conditions for production of nano-crystalline materials by severe plastic deformation. Application of technologies ECAP, CEC and TC, evolution of structure and properties of selected alloys. Influence of the shape of tools, comparison of different technologies, magnitude of deformation, stress state, evolution of structure, aging, recrystallisation, achievable properties. Analysis of thermo-mechanical conditions during the ECAP process using the software FormFEM.
14. The principle and the physical nature of the structure evolution at application of SPD technologies. Construction of individual devices, processed alloys and properties. Conditions of structure stability (instability). Analysis of the structure evolution with use of software. Industrial use of SPD technologies at production of nano-crystalline materials. Examples of the use of nano-crystalline materials in modern structures.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
Předmět neobsahuje žádné hodnocení.