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Wyświetlanie 1-4 z 4
Tytuł:
Nowy gatunek stali na szyny tramwajowe
Novel steel grade for groove rail
Autorzy:
Żak, S.
Zygmunt, T.
Kasprowicz, J.
Kozera, K.
Powiązania:
https://bibliotekanauki.pl/articles/251334.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
gatunek B1000
szyna tramwajowa
właściwości mechaniczne
spawanie termitowe
spawanie elektrodą
wyniki badań eksploatacyjnych
steel grade B1000
grooved rails
mechanical properties
thermite welding
electric arc welding
exploitation results
Opis:
W artykule omówiono genezę i uwarunkowania uruchomienia produkcji szyn tramwajowych naturalnie chłodzonych (bez obróbki cieplnej) w nowym gatunku stali. Przedstawiono także wyniki badań właściwości mechanicznych, twardości, oceny mikrostruktury, odporności na kruche pękanie i innych. Otrzymany poziom właściwości odniesiono do wymagań stawianych szynom obrobionym cieplnie w normie Europejskiej EN14811. Opisano także dobór technologii łączenia szyn przy użyciu spawania łukiem elektrycznym i spawania termitem.
In this article the origin and conditionings of the start of production grooved rails naturally cooled (without heat treatment) in a new steel grade are discussed. Results of mechanical properties, hardness, evaluation of microstructure, fracture toughness and others are presented. Received level of properties is related to the requirements of heat treated rails described in European standard EN14811. Selection of connection technology of rails using arc and thermite weld is also described.
Źródło:
TTS Technika Transportu Szynowego; 2018, 3; 41-44
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoscale Aluminum - Metal Oxide (Thermite) Reactions for Application in Energetic Materials
Autorzy:
Piercey, D. G.
Klapötke, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/358693.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nano-aluminum
materials
thermites
energetic materials
Opis:
Energetic materials fnd use in both military and civilian applications, however many commonly used materials suffer from serious defciencies including toxicity and high sensitivity. Nanothermites exhibit vastly differing characteristics compared to their well known micron scale relatives and through the use of various preparatory chemical techniques can be tailored to have a wide spectra of chemical and energetic properties. This may allow use as superior replacements of conventional energetic materials in various applications.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 2; 115-129
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Activation of Al/MoO3 Thermite as a Component of Energetic Condensed Systems to Increase Its Effciency
Autorzy:
Meerov, D.
Ivanov, D.
Monogarov, K.
Muravyev, N.
Pivkina, A.
Frolov, Y.
Powiązania:
https://bibliotekanauki.pl/articles/358816.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
thermites
burning rate
nano-MoO3
Opis:
In the present work a stoichiometric energetic compositions Al+MoO3 prepared by dry mixing and by reactive milling of micro-scale particles were investigated. Morphology, particle size and surface structure of produced powders were examined using scanning electron microscopy, atomic-force microscopy, laser diffractometry and BET analysis. DSC/TG data were processed to obtain kinetic mechanism of the reaction between Al and MoO3. The combustion rate of Al+MoO3 thermite mixture increases with pressure, reaching a maximum at ~10 atm, and then decreases with further pressure increase. The rise of combustion rate at the low range of pressure is associated with the rise in the extent of the vapour phase penetrating the pores of the pressed sample as the ambient pressure increases. However, at a higher pressure the gas formation is suppressed, and the melt formed in the combustion process can selectively wet the pores resulting in inhibition of reaction. Burning rates of mechanical activated system Al+MoO3 are two times higher then not-activated system at ambient pressure ~10 atm and 8 times higher at ~40 atm. In additional experiments, nano-scale MoO3 powder was prepared by evaporation with a subsequent condensation onto cooled plate in an inert-gas fow. Scanning electron microscopy showed that nano-MoO3 particles are absolutely spherical with mean diameter ~100 nm, and atomic-force microscopy 278 D. Meerov et al. reveals smaller particles with mean diameter ~5-30 nm. DSC/TG data showed that the nano-MoO3 starts to sublime earlier than micro MoO3. The use of nano-sized components could considerably increase the burning rates of energetic condensed systems, because of its large specifc surface, lower temperature of sublimation, and high reaction ability.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 3-4; 277-289
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling
Autorzy:
Oh, Minseok
Kim, Kwanil
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/355529.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-CuO
thermite
nanocomposite
cryomilling
high energy density materials
Opis:
Al-CuO is a thermite material exhibiting the exothermic reaction only when aluminum melts. For wide spread of its applica-tion, the reaction temperature needs to be reduced in addition to the enhancement of total reaction energy. In the present study, a thermite nanocomposite with a large contact area between Al and CuO was fabricated in order to lower the exothermic reaction temperature and to improve the reactivity. A cryomilling process was performed to achieve the nanostructure, and the effect of composition on the microstructure and its reactivity was studied in detail. The microstructure was characterized using SEM and XRD, and the thermal property was analyzed using DSC. The results show that as the molar ratio between Al and CuO varies, the fraction of uniform nanocomposite structure was changed affecting the exothermic reaction characteristics.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 931-934
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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