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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 - anglický
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
Klíčová slova:
Magnesium alloy AZ91; Plasma spraying
Dokument je dostupný na externích webových stránkách.
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 ...
Structural and Mechanical Characterization of Spark Plasma Sintered Tungsten
Čech, J.; Haušild, P.; Kocmanová, Lenka; Matějíček, Jiří
2015 - anglický
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
Klíčová slova:
tungsten; SPS; instrumented indentation
Dokument je dostupný na externích webových stránkách.
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 ...
Deposition of Fluorocarbon Plasma Polymer Nanoparticles and their Basic Properties
Serov, Anton; Choukourov, A.; Artemenko, A.; Kuzminova, A.; Biederman, H.; Hrabovský, Milan
2015 - anglický
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.
Klíčová slova:
poly(tetrafluoroethylene); magnetron sputtering; plasma polymerization; superhydrophobic
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
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 - anglický
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.
Klíčová slova:
optical glass; microroughness; PROBA3; ASPIICS
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
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 - anglický
The aim of the study is to develop a process chain and realize prototype lenses of non-symmetrical apherical lenses of given tolerances.
Klíčová slova:
non-symmetrical; aspherica lens
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
Nanostructuring of solid surfaces by discharge-pumped xuv laser source
Schmidt, Jiří; Štraus, Jaroslav; Koláček, Karel; Frolov, Oleksandr
2015 - anglický
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
Klíčová slova:
XUV laser; laser ablation; diffraction pattern
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
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 - anglický
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
Klíčová slova:
plasma; tokamak; diagnostic
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
Unfolding of energies of fusion products measured by the activation probe at JET
Ficker, Ondřej; Mlynář, Jan; Bonheure, G.; Murari, A.; Popovichev, S.
2015 - anglický
Providing a detection method for diagnostic of charged fusion products in tokamaks presents a major challenge, while its absolute calibration with a sufficient accuracy and its capability to withstand harsh fusion reactor environment will be required. A novel type of detector that meets most of these requirements, based on an activation probe, was tested in JET and other European facilities. This probe proved to be extremely robust due to its simple construction. It is equipped with samples of well defined isotopic abundance. The amounts of activated nuclei due to the reactions in these materials could be measured via ultra-low-level gamma spectroscopy. The feasibility of the proton spectrum reconstruction from measured activities is examined in this contribution with the help of the algorithm based on the Tikhonov regularisation constrained by minimum Fisher information. The reliability of the method was previously illustrated using synthetic proton data.
Klíčová slova:
fusion products; nuclear activation; protons; spectra
Dokument je dostupný na externích webových stránkách.
Unfolding of energies of fusion products measured by the activation probe at JET
Providing a detection method for diagnostic of charged fusion products in tokamaks presents a major challenge, while its absolute calibration with a sufficient accuracy and its capability to withstand ...
Enthalpy Probe Diagnostics of Steam/Argon Plasma Jet
Hlína, Michal; Hrabovský, Milan
2015 - anglický
DC plasma torch with argon/water stabilization features extreme properties of the exiting plasma jet. The plasma mass flow rate is very low while the temperature reaches very high values. Plasma properties were measured by enthalpy probe connected to a mass spectrometer. The measurements of enthalpy, temperature, density and dynamic pressure were carried out for three different arc currents and at atmospheric pressure. The dependences of plasma characteristics on arc current were shown.
Klíčová slova:
enthalpy probe; thermal plasma; plasma diagnostics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Enthalpy Probe Diagnostics of Steam/Argon Plasma Jet
DC plasma torch with argon/water stabilization features extreme properties of the exiting plasma jet. The plasma mass flow rate is very low while the temperature reaches very high values. Plasma ...
Boronized stainless steel with zirconia coatings
Brožek, Vlastimil; Kolísko, J.; Kubatík, Tomáš František; Mastný, L.; Pokorný, P.; Tej, P.
2015 - anglický
Conditions of boronizing are described using a reactive diffusion method of boron from boron carbide and lanthanum hexaboride so that the formation of Fe2B is preferred to FeB which is more brittle and whose structure does not satisfy the conditions for perfect adhesion of modified zirconia ceramics. Perfectly rigid adhesive connection of needle-like embedded interlayers Fe2B in steel AISI 303 prepared by reactive diffusion of a boronizing medium without activators at 1000 ° C and exposure of 2-4 hours has the value of 20 - 24 MPa at the Pinn-off test.Ceramic coatings from Al2O3-ZrO2 ceramics formed on those interlayers have the value of bond strength up to 14 - 20 MPa.Thermal cycling between 100°C - 600 °C confirmed good adhesion of coatings with the underlying steel.During thermal cycling at elevated temperatures (600-1000 °C) there occurs a statistically significant number of faults in cohesion and mechanical destruction of the coatings. One of the reasons are secondary changes
Klíčová slova:
Boronised steel; plasma spraying; ceramic coatings; bond strength; zirkonia coatings
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Boronized stainless steel with zirconia coatings
Conditions of boronizing are described using a reactive diffusion method of boron from boron carbide and lanthanum hexaboride so that the formation of Fe2B is preferred to FeB which is more brittle ...
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