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Electron Beam Micromachining of Nonmetalic Materials
Dupák, Libor ; Mrňa, Libor (referee) ; Bábor, Petr (referee) ; Lencová, Bohumila (advisor)
The thesis deals with electron beam micromachining of nonmetallic materials like glass, ceramics and plastics. A brief description of the device on which the experiments were carried out is included; the author has participated on its development. Main topic is experimental study of influence of main electron beam parameters on results of machining. Examined parameters include accelerating voltage, beam current, focusing and speed of machining. Influence of beam deflection is analyzed. Method of sequential machining by repeated passes of the electron beam is presented. Main examined materials are quartz glass, alumina and selected plastics. The usefulness of the technology is shown by several practical applications.
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Study of fracture toughness and wear resistance of thin MoBC coating under dynamic conditions
Buršíková, V. ; Grossman, Jan ; Fořt, Tomáš ; Souček, P. ; Zábranský, L. ; Buršík, Jiří ; Vašina, P. ; Dupák, Libor ; Sobota, Jaroslav
The aim of the present work was to study the mechanical properties of thin amorphous MoBC coatings and MoBC coatings consisting of nanocrystalline Mo2BC embedded in amorphous MoBC matrix. The hardness of the amorphous MoBC coatings (20 GPa) is comparable with the common amorphous diamond-like carbon coatings, however their elastic modulus as well as fracture toughness and ductility are significantly higher. Magnetron sputtering of three targets, B4C, C and Mo, for MoBC was used for coatings preparation. The aim of this work was to study the mechanical and tribological properties of MoBC coatings deposited on high speed steel substrate. The classification of MoBC coatings was performed using an impact tester in a dynamic mode and enabled us to predict the limit load causing the coating destruction.
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SMV-2014-05: Electron Beam Welder MEBW-60/2
Zobač, Martin ; Vlček, Ivan ; Dupák, Libor ; Dupák, Jan ; Kapounek, Petr
License fee from production and sales of the electron beam welder MEBW-60/2, which research and development was conducted at ISI in years 2006-2008. The device is significantly upgraded version of the electron beam welder developed at ISI during past 20 years. It features a working chamber with volume of 7 liters, an electron gun with accelerating voltage of 60 kV. The beam power is fluently adjustable up to 2 kW. For movement of the welded pieces it is possible to use 2-axis motorized manipulator. The control of the welder is fully digital and all functions are available to user through movable control panel. The device includes work table with work area large enough for needed preparatory work. Spatial arrangement is variable so it allows customization in place of installation.
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SMV-2012-30: Electron Beam Welder MEBW-60/2
Zobač, Martin ; Vlček, Ivan ; Dupák, Jan ; Dupák, Libor ; Kapounek, Petr
License fee from production and sales of the electron beam welder MEBW-60/2, which research and development was conducted at ISI in years 2006-2008. The device is significantly upgraded version of the electron beam welder developed at ISI during past 20 years. It features a working chamber with volume of 7 liters, an electron gun with accelerating voltage of 60 kV. The beam power is fluently adjustable up to 2 kW. For movement of the welded pieces it is possible to use 2-axis motorized manipulator. The control of the welder is fully digital and all functions are available to user through movable control panel. The device includes work table with work area large enough for needed preparatory work. Spatial arrangement is variable so it allows customization in place of installation.
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SMV-2013-24: New brazing and welding methods for new x-ray sources
Zobač, Martin ; Vlček, Ivan ; Dupák, Libor
The subject of the project was further research and development of permanent joints of metal materials by electron beam welding and vacuum brazing. The outcome of the project were specific technological procedures for the given assemblies, as well as technological procedures for various combinations of metal materials with general usability. The significant experimental demands were characteristic for this project.
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