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Wyświetlanie 1-3 z 3
Tytuł:
Nanocomposites graphene/CoFe2O4 and graphene/NiFe2O4 – preparation and characterization
Autorzy:
Jędrzejewska, A.
Sibera, D.
Pełech, R.
Jedrzejewski, R.
Narkiewicz, U.
Powiązania:
https://bibliotekanauki.pl/articles/352113.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
graphene
nanocomposites
CoFe2O4
NiFe2O4
Opis:
A series of nanocomposite graphene/CoFe2 O4 and graphene/NiFe2 O4 hybrid materials was synthesized via facile, one-pot solvothermal route. The materials were obtained using two pressure methods: synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The use of a microwave reactor enabled to significantly shorten the synthesis time up to 15 min. All the syntheses were carried out in a solution of ethanol. The effect of processing conditions and composite composition on the physicochemical properties and electric conductivity was studied. The specific surface area, density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated. The results of studies of composites obtained in an autoclave and in a microwave reactor were compared.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 103-112
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermal Stability of CrCN Coatings Deposited on Nitrided Substrates Using Modulated Temperature Thermodilatometry
Autorzy:
Mydłowska, K.
Myśliński, P.
Szparaga, Ł.
Ratajski, J.
Gilewicz, A.
Jędrzejewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/352462.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antiwear coatings
nitriding
residual stress
thermal stability
thermodilatometry
Opis:
The aim of the research was to investigate the influence of nitriding of the substrate made of 42CrMo4 steel on thermal stability of the antiwear CrCN coating deposited on its surface using Cathodic Arc Evaporation method. Samples of non-nitrided and nitrided substrate/CrCN coating systems were tested with Modulated Temperature Thermodilatometry, which program included system annealing in 26 h, temperature of 290°C and argon atmosphere. Recorded during tests, changes in substrate elongation in response for changes of sample temperature, enabled qualitative determination of changes in stress states in the coatings as a result of samples annealing. Annealing of the system with nitrided substrate resulted in smaller change in residual stress in coating than for the system with non-nitrided substrate, which can indicate its better thermal stability. Values of residual stresses in coatings calculated by sin2ψ method before and after annealing on the basis of tests performed using X-Ray diffraction, agree with results of dilatometric tests.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 771-776
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and performance study of a small-scale waste heat recovery turbine
Autorzy:
Rusanov, R.
Jędrzejewski, Ł.
Klonowicz, P.
Żywica, G.
Lampart, P.
Rusanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/175197.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cogeneration unit
low-boiling working media
numerical method
turbine
radialaxial stage
Opis:
The paper presents the design process of a radial-axial turbine working with SES36 working fluid. First, the mean-line design process is performed and then the geometry is developed. In the next stage the numerical verification is performed taking into account the real properties of the working fluid. The properties are implemented via a look-up table and by a modified Benedict-Webb-Rubin equation of state. The presented turbine is characterized by a very small stator outflow angle which is about 4.5◦ but despite this small value, the efficiency of the machine is relatively high and equal to about 88%. The influence of internal leakages has also been investigated.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 145-162
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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