Number of found documents: 516
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Structural and Mechanical Characterization of Spark Plasma Sintered Tungsten
Čech, J.; Haušild, P.; Kocmanová, Lenka; Matějíček, Jiří
2015 - English
The main objective of this paper is to describe the microstructure and mechanical properties of spark plasma sintered tungsten. The indentation tests, which are very advantageous because of their semi-nondestructive character and low requirements on the volume of investigated material, were carried out using Berkovich and spherical indenters. Indentation techniques with spherical indenters are less frequently used than those with sharp indenters but they offer variation of strain with the indentation depth and, therefore, they could be used for determination of stress-strain curves. Local stress-strain behavior obtained by this method showed good correspondence with the results of compression tests. Observation of the microstructure and the fracture surfaces helped to explain some phenomena which occurred during the mechanical testing Keywords: tungsten; SPS; instrumented indentation Fulltext is available at external website.
Structural and Mechanical Characterization of Spark Plasma Sintered Tungsten

The main objective of this paper is to describe the microstructure and mechanical properties of spark plasma sintered tungsten. The indentation tests, which are very advantageous because of their ...

Čech, J.; Haušild, P.; Kocmanová, Lenka; Matějíček, Jiří
Ústav fyziky plazmatu, 2015

Chemical aspects of antiballistic cermets preparation
Brožek, Vlastimil; Kubatík, Tomáš František; Chráska, Tomáš; Mušálek, Radek; Janata, Marek; Mastný, L.
2015 - English
The paper aims to demonstrate the possibilities of metal-ceramic material deposition on different types of metal or ceramic substrates using plasma deposition. A number of self-supporting components and the preparation of metal-braced composites are described and the results of plasma depositions of two particular extremely hard ceramic materials, boride and nitride of titanium are presented. The plasma deposition of these material is performed in technological conditions which prevent undesirable high-temperature oxidation. The paper describes deposition conditions that may lead to materials suited to create anti-ballistic protection and complicated shapes or improve parameters of surface layers of present anti-ballistic ceramics. Keywords: Anti-ballistic ceramics; armour ceramics; plasma spraying; titanium boride; plasma spraying; titanium nitride Fulltext is available at external website.
Chemical aspects of antiballistic cermets preparation

The paper aims to demonstrate the possibilities of metal-ceramic material deposition on different types of metal or ceramic substrates using plasma deposition. A number of self-supporting components ...

Brožek, Vlastimil; Kubatík, Tomáš František; Chráska, Tomáš; Mušálek, Radek; Janata, Marek; Mastný, L.
Ústav fyziky plazmatu, 2015

Mechanical and chemical properties of plasma sprayed bronze CuAl10 coating on magnesium and magnesium alloy AZ91
Kubatík, Tomáš František; Vilémová, Monika; Mušálek, Radek; Janata, Marek
2015 - English
The most common magnesium alloy AZ91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare protective metallic and nonmetallic coatings on a wide variety of substrates including magnesium and its alloys. In this study, CuAl10 was plasma sprayed on magnesium and magnesium alloy AZ91 with the aim to study corrosion resistance of the magnesium substrates. The work focuses on optimization of the plasma spraying process, on chemical composition of the coatings, on interface between the coating and substrate, as well as on adhesive strength of the coatings. The coating were deposited after two passes of the spraying torch resulting in thickness of 150 micro m on magnesium substrate and 110 micro m on AZ91 substrate. Chemical microanalysis showed that deposition of CuAl10 alloy on magnesium results in formation of an intermetallic layer at the interface. The layer provides a Keywords: Magnesium alloy AZ91; Plasma spraying Fulltext is available at external website.
Mechanical and chemical properties of plasma sprayed bronze CuAl10 coating on magnesium and magnesium alloy AZ91

The most common magnesium alloy AZ91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare ...

Kubatík, Tomáš František; Vilémová, Monika; Mušálek, Radek; Janata, Marek
Ústav fyziky plazmatu, 2015

Process development and prototype realization of non-symmetrical aspherical lenses
Melich, Radek; Pintr, Pavel; Pleštil, Jan; Poláková, Ivana; Procháska, František; Rail, Zdeněk; Václavík, Jan; Vápenka, David; Vít, Tomáš
2015 - English
The aim of the study is to develop a process chain and realize prototype lenses of non-symmetrical apherical lenses of given tolerances. Keywords: non-symmetrical; aspherica lens Available at various institutes of the ASCR
Process development and prototype realization of non-symmetrical aspherical lenses

The aim of the study is to develop a process chain and realize prototype lenses of non-symmetrical apherical lenses of given tolerances.

Melich, Radek; Pintr, Pavel; Pleštil, Jan; Poláková, Ivana; Procháska, František; Rail, Zdeněk; Václavík, Jan; Vápenka, David; Vít, Tomáš
Ústav fyziky plazmatu, 2015

P3-TOP-TN-15001 Achievable microroughness of ASPIICS optical glass elements
Bartoníček, Jiří; Budasz, Jiří; Hadincová, Ivana; Horodyská, Petra; Kaucká, Iva; Kovačičinová, Jana; Lédl, Vít; Melich, Radek; Pleštil, Jan; Poláková, Ivana; Procháska, František; Psota, Pavel; Rail, Zdeněk; Šípová, Gabriela; Šrajer, Bohdan; Ulrichová, Iva; Václavík, Jan; Vápenka, David; Vít, Tomáš
2015 - English
The scope of this document is describe a test that investigates an achievable micro-roughness realized on different types of optical glasses [R1] that are planned to be employed for realization of PROBA3 coronagraph telescope. The test is realized with respect to the technological manufacturing possibilities of optical elements at TOPTEC facility. Keywords: optical glass; microroughness; PROBA3; ASPIICS Available at various institutes of the ASCR
P3-TOP-TN-15001 Achievable microroughness of ASPIICS optical glass elements

The scope of this document is describe a test that investigates an achievable micro-roughness realized on different types of optical glasses [R1] that are planned to be employed for realization of ...

Bartoníček, Jiří; Budasz, Jiří; Hadincová, Ivana; Horodyská, Petra; Kaucká, Iva; Kovačičinová, Jana; Lédl, Vít; Melich, Radek; Pleštil, Jan; Poláková, Ivana; Procháska, František; Psota, Pavel; Rail, Zdeněk; Šípová, Gabriela; Šrajer, Bohdan; Ulrichová, Iva; Václavík, Jan; Vápenka, David; Vít, Tomáš
Ústav fyziky plazmatu, 2015

Optické parametry objektivu Secrétan Paris 130/1930 Hvězdárny v Úpici.
Rail, Zdeněk; Melich, Zbyněk
2015 - Czech
Objektiv Secrétan Paris 130/1930 Hvězdárny v Úpici byl na pracovišti ÚFP AV ČR, v.v.i.- TOPTEC vyčištěn a byly proměřeny jeho optické parametry. V referátu uvádíme výsledky matematické simulace zbytkových vad objektivu. The Optical Parameters of Objective Lens Secrétan Paris 130/1930 of Observatory of Úpice Objective lens of Secrétan Paris 130/1930 of Úpice observatory was cleaned a measured its optical parameters in IPP AS CR, v.v.i. - TOPTEC. In this paper we present results of mathematical simulation of residual aberrations of this lens. Keywords: Achromatic doublet; Antonín Bečvář; Chromatic aberration; Lens parameters; Residual optical aberrations; B-F type of chromatic correction; Uncorrected coma Fulltext is available at external website.
Optické parametry objektivu Secrétan Paris 130/1930 Hvězdárny v Úpici.

Objektiv Secrétan Paris 130/1930 Hvězdárny v Úpici byl na pracovišti ÚFP AV ČR, v.v.i.- TOPTEC vyčištěn a byly proměřeny jeho optické parametry. V referátu uvádíme výsledky matematické simulace ...

Rail, Zdeněk; Melich, Zbyněk
Ústav fyziky plazmatu, 2015

Deposition of Fluorocarbon Plasma Polymer Nanoparticles and their Basic Properties
Serov, Anton; Choukourov, A.; Artemenko, A.; Kuzminova, A.; Biederman, H.; Hrabovský, Milan
2015 - English
Fluorocarbon plasma polymer nanoparticles have been fabricated using gas aggregation cluster source (GAS) equipped with a planar magnetron with PTFE target. A beam of nanoparticles 20 – 200 nm in diameter was generated. Fluorocarbon nanoparticle films have shown very good water repellent properties. Films immersed in ethanol for two hours exhibited excellent stability that was also good in case of water. Measurements using a deflection system showed the presence of both neutral and charged nanoparticles. Keywords: poly(tetrafluoroethylene); magnetron sputtering; plasma polymerization; superhydrophobic Fulltext is available at external website.
Deposition of Fluorocarbon Plasma Polymer Nanoparticles and their Basic Properties

Fluorocarbon plasma polymer nanoparticles have been fabricated using gas aggregation cluster source (GAS) equipped with a planar magnetron with PTFE target. A beam of nanoparticles 20 – 200 nm in ...

Serov, Anton; Choukourov, A.; Artemenko, A.; Kuzminova, A.; Biederman, H.; Hrabovský, Milan
Ústav fyziky plazmatu, 2015

Nanostructuring of solid surfaces by discharge-pumped xuv laser source
Schmidt, Jiří; Štraus, Jaroslav; Koláček, Karel; Frolov, Oleksandr
2015 - English
The experimental results of interaction of focused XUV laser beam (wavelength 46.9 nm) with Polymethylmethacrylate (PMMA) and GaAs samples will be presented. Proximity-standing golden grid showed on naturally-generated diffraction pattern that direct nanostructuring is possible Keywords: XUV laser; laser ablation; diffraction pattern Available at various institutes of the ASCR
Nanostructuring of solid surfaces by discharge-pumped xuv laser source

The experimental results of interaction of focused XUV laser beam (wavelength 46.9 nm) with Polymethylmethacrylate (PMMA) and GaAs samples will be presented. Proximity-standing golden grid showed on ...

Schmidt, Jiří; Štraus, Jaroslav; Koláček, Karel; Frolov, Oleksandr
Ústav fyziky plazmatu, 2015

Measurements with Atomic Beam Probe Diagnostic on the COMPASS Tokamak
Háček, Pavel; Berta, Miklós; Krbec, Jaroslav; Stöckel, Jan; Weinzettl, Vladimír; Bencze, A.; Zoletnik, S.; Anda, G.
2015 - English
Atomic beam probe is a new diagnostic method for detection of ions coming from the ionized part of diagnostic neutral beams in tokamaks. The method allows to measure plasma density fluctuations and fast variations in the poloidal magnetic field. Therefore, one can follow fast changes in the edge plasma current. Test detector has been installed on COMPASS as an extension of lithium beam diagnostic and the article presents the first measurements done with the diagnostic Keywords: plasma; tokamak; diagnostic Available at various institutes of the ASCR
Measurements with Atomic Beam Probe Diagnostic on the COMPASS Tokamak

Atomic beam probe is a new diagnostic method for detection of ions coming from the ionized part of diagnostic neutral beams in tokamaks. The method allows to measure plasma density fluctuations and ...

Háček, Pavel; Berta, Miklós; Krbec, Jaroslav; Stöckel, Jan; Weinzettl, Vladimír; Bencze, A.; Zoletnik, S.; Anda, G.
Ústav fyziky plazmatu, 2015

První experimenty s přípravou suspenzního nástřiku Al2O3 pomocí hybridního plazmového hořáku
Tesař, Tomáš; Mušálek, Radek; Medřický, Jan; Kotlan, Jiří; Pala, Zdeněk
2015 - Czech
Hybridní vodou stabilizovaný hořák WSP-H představuje zajímavou alternativu k běžným hořákům pro žárové stříkání, neboť poskytuje jedinečnou kombinaci rychlosti plazmatu a entalpie dostupné pro zpracování materiálu. V této práci je studován vliv depozičních parametrů na charakteristiky nástřiku. Jako modelový materiál byl použit nanometrický Al2O3 dispergovaný v etanolu. Nástřik byl zkoumán pomocí skenovací elektronové mikroskopie a rentgenové difrakce. Výsledky prokázaly závislost charakteru mikrostruktury a fázového složení na podávací vzdálenosti a podávaném množství suspenze. Výsledky jsou zajímavé pro další optimalizaci depozičního procesu Hybrid water stabilized plasmatron WSP-H represents an interesting alternative to common torches for thermal spraying, because it provides a unique combination of plasma velocity and enthalpy available for material processing. In this paper, influence of deposition parameters on coating characteristics was studied. Nanometric Al2O3 powder dispersed in ethanol was used as a model material. The coating was examined by scanning electron microscopy and X-ray diffraction and the results showed clear dependence of microstructure and phase composition on spraying distance and feed rate of the suspension. Results are promising for further optimization of the deposition process. Keywords: suspension plasma spraying; alumina; microstructure Available at various institutes of the ASCR
První experimenty s přípravou suspenzního nástřiku Al2O3 pomocí hybridního plazmového hořáku

Hybridní vodou stabilizovaný hořák WSP-H představuje zajímavou alternativu k běžným hořákům pro žárové stříkání, neboť poskytuje jedinečnou kombinaci rychlosti plazmatu a entalpie dostupné pro ...

Tesař, Tomáš; Mušálek, Radek; Medřický, Jan; Kotlan, Jiří; Pala, Zdeněk
Ústav fyziky plazmatu, 2015

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