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Tytuł:
Study on Magnetic Properties of the U-Type Ferrite According to Substituted Elements
Autorzy:
Jeong, Kwang-Pil
Kim, Jeong-Gon
Yang, Su-Won
Yun, Jae-Ho
Choi, Jin-Hyuk
Powiązania:
https://bibliotekanauki.pl/articles/354006.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
U-type ferrite
hexagonal ferrite
sol-gel process
Opis:
The magnetic properties of the U-type ferrite synthesized by a sol-gel process had studied by substituting cobalt with manganese or zinc in cobalt-based U-type ferrite. The substituted U-type ferrite showed a dominant crystal structure at a different substitution ratio of manganese and zinc. The change of the starting temperature of U-type ferrite formation according to substitutional elements was confirmed by TG-DTA analysis. In the case of manganese substitution, the starting temperature of U-type ferrite formation lowered, and on the contrary, when zinc was substituted, it became higher. The magnetic properties of the U-type ferrite substituted with manganese showed a tendency that the saturation magnetization was decreased and the coercivity was increased as the manganese ratio increased. The highest saturation magnetization was 57.9 emu/g in the specific composition (Ba4Co0.5Zn1.5Fe36O60) substituted with zinc.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 501-505
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ warunków austenityzowania i podwyższonej zawartości Cr na kinetykę przemian przechłodzonego austenitu stali podeutektoidalnej obrabianej plastycznie
The influence of austenitizing conditions and additional Cr contents on transformation kinetics of undercooled austenite of hypo eutectoid steel treated by plastic forming
Autorzy:
Wierszyłłowski, I.
Borowski, J.
Wieczorek, S.
Powiązania:
https://bibliotekanauki.pl/articles/211536.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
pearlite
acicular ferrite
grained ferrite
bainite
transformation kinetics
Opis:
Badania przeprowadzono podczas ciągłego chłodzenia stali C45E i 41Cr 4 austenityzowanych w temperaturach 860, 950 i 1050 °C. Badano przemiany austenitu w ferryt ziarnisty, ferryt iglasty, perlit i bainit. Czas początku przemian przechłodzonego austenitu malał wraz ze wzrostem stopnia przechłodzenia, wzrastał ze wzrostem temperatury austenityzowania i zawartością Cr w stali. Kinetykę przemian przechłodzonego austenitu analizowano przy pomocy zmodyfikowanego równania Kissingera. Energia aktywacji przemian malała wraz ze wzrostem stopnia przechłodzenia, wzrost temperatury austenityzowania i zawartość Cr powodowały wzrost energii aktywacji wszystkich przemian przechłodzonego austenitu. Zmniejszenie energii aktywacji wraz ze wzrostem stopnia przechłodzenia należy tłumaczyć decydującym wpływem siły napędowej przemiany. Wzrost energii aktywacji był spowodowany trudniejszym zarodkowaniem i zmniejszającą się wraz z rosnąca temperaturą austenityzowania ilością dróg łatwej dyfuzji. Obecność Cr utrudniała dyfuzję węgla limitującą przemiany przechłodzonego austenitu.
The studies were performed under continuous cooling conditions of C 45E and 41Cr4 steels austenitised at 860, 950 and 1050 °C. Transformation of the austenite into grained and acicular ferrite, pearlite and bainite were analyzed. The time of the transformations start decreases with increase of undercooling degree, and increases with increase of austenitising temperature and Cr content in steel. Transformation kinetics was analyzed with use of modified Kissinger equation .Activation energies of all transformations decreases with increase of undercooling degree. Increase of austenitising temperature and addition of Cr increases activation energies of under cooled austenite. The decrease of activation energies for undercooled austenite transformations can be explained by predominant influence of transformations driving force. The increase of activation energies can be explained by more difficult nucleation because of less easy diffusion path.
Źródło:
Obróbka Plastyczna Metali; 2006, 17, 2; 65-71
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Microwave Absorption Characteristics by Coating Layer in Substituted U-Type Ferrites
Autorzy:
Jeong, Kwang-Pil
Kim, Jeong-Gon
Yang, Su-Won
Choi, Jin-Hyuk
Park, Seung-Young
Powiązania:
https://bibliotekanauki.pl/articles/353196.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hexagonal ferrite
U-type ferrite
silicon oxide layer
microwave absorption
Opis:
The U-type ferrite is a kind of hexagonal ferrite, and it is known as a microwave absorber in the X-band. The magnetic and dielectric loss of the U-type ferrite change to the composition and coating layer, etc. In this study, the silicon oxide layer was coated on the substituted U-type ferrites to improve microwave absorption characteristics. The complex permittivity and complex permeability were measured using toroidal specimens that were press-molded and the measured frequency range was set from 2-18 GHz. The improvement of the microwave absorption rate was different according to the type of the substituted U-type ferrites. Only in the substituted U-type ferrites with nickel and zinc, an improvement in the microwave absorption rate due to enhancement of magnetic loss was confirmed. The highest microwave absorption was 99.9% at 9.6 GHz, which was S_Z0.5 U.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1287-1291
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of the S49 Rail after a Long Term Outdoor Exposure
Autorzy:
Konieczny, Jarosław
Labisz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2172345.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microstructure
perlite
ferrite
hardness
Opis:
The subject of the research in this work was the S49 rail made of R260 rail steel (1.0623). The carried out investigations concern microstructure tests and tests of mechanical properties of rails after several years of exposure in the open air without usage. The purpose of the work was to determine on the basis of the results of research the possibilities of using the tested rail for usage and application for the construction of tracks on railway sidings. For investigations there were used diverse techniques reaching such engineering materials investigations like light or scanning electron microscope for microstructure investigations, as well as hardness and microhardness test were performed for determinations of the microstructural changes occurred in the upper area of the rails surface. The microstructure changes concerns especially the ferritic and pearlitic structure and the breaks in the present carbide mesh. During investigations it was found out that the tested railway rails are fully useful for application, after machining to achieve required dimensional parameters. It is also of high importance, of the economical point of view, that their price, also in case of earlier installation of the rails, may be lower than the current price offered on the marked for a entire new product. The price difference reaches dimensions in the range of 5% - 10%.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 2; 280--290
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Substituted Elements on Reflection Loss of Ba-Ferrite Nanoparticle
Autorzy:
Yang, S.
Jeong, K.-P.
Park, S.-Y.
Kim, J.-G.
Powiązania:
https://bibliotekanauki.pl/articles/352041.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ba ferrite
substitutional m-type ferrite
reflection loss
sol-gel
additional atom
Opis:
Due to the rapid development of the information communication industries, it is expected that next-generation mobile communication devices in the data communication environment will be used at the same time in the L~X band (1–12 GHz). To mutual electric wave interference prevention, research on wave absorbers in L~X band is needed. In this paper, barium ferrite was researched as L~X band wave absorber. The Barium ferrite (BaM, Ba ferrite) substituted by divalent ions (Co2+, Cu2+, Ni2+, Zn2+) and tetravalent ion (Ti4+). The substituted Ba ferrite nanoparticles were fabricated by sol-gel process. Lattice parameter, particle size, magnetic properties, and reflection loss were analyzed by X-ray diffraction (X-RD), a Vibrating Sample Magnetometer (VSM), and a Network Analyzer. Lattice parameter of Ba ferrite was changed 0.0005 to 0.0078 Å in a-b direction, and 0.0187 to0.0445 Å in c-direction by substituted elements, and it influenced on magnetic anisotropy. In addition, Co-Ti substitution elements influenced that coercive force decrease 5,739 to 2,240 Oe. Moreover, reflection loss frequencies were shifted from 16.3 GHz to 14.4 and 17.4 GHz by substituted elements Co-Ti and Zn-Ti.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1201-1204
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Combined Influence of Molybdenum and Nickel in Steel Welds
Autorzy:
Szczucka-Lasota, B.
Węgrzyn, T.
Kurc-Lisiecka, A.
Piwnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/352371.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
steel
ferrite
impact toughness
Opis:
Weld metal deposit (WMD) was carried out for standard MMA welding process. This welding method is still promising mainly due to the high amount of AF (acicular ferrite) and low amount of MAC (self-tempered martensite, retained austenite, carbide) phases in WMD. That structure corresponds with good impact toughness of welds at low temperature. Separate effect of these elements on the mechanical properties of welds is well known, but the combined effect of these alloy additions has not been analyzed so far. It was decided to check the total influence of nickel with a content between 1% to 3% and molybdenum with content from 0.1% up to 0.5%.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1087-1091
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and electromagnetic properties of microwave sintered CoCuZn ferrites
Autorzy:
Patankar, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/411554.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ferrite
microwave sintering
Microstructure
electromagnetic
inductors
Opis:
Co-Cu-Zn ferrite material has been extensively used in multilayer chip inductors because of their good electromagnetic properties at higher frequencies and low sintering temperatures. In this research work, a comparative study on Co-Cu-Zn ferrite prepared from two different routes is reported. The two different routes are conventional ceramic sintering method (CS) and is microwave sintered (MS) method. The former route is most commonly used while the latter one is now gaining popularity in sintering processes. The work highlights that the sintering temperature and time were significantly reduced from 4 h and 1250 °C for the CS process to 20 min and 900 °C for MS process. Moreover, microwave sintering also improves the physical and electromagnetic properties of ferrite.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 1; 1-8
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and magnetic properties of cobalt ferrite nanopowders synthesis using contact non-equilibrium plasma
Autorzy:
Frolova, L.
Derimova, A.
Butyrina, T.
Powiązania:
https://bibliotekanauki.pl/articles/1052775.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
nanomaterials
cobalt
ferrite
Fe/Co molar ratio
Opis:
Different grades of magnetic cobalt ferrite (Co_xFe_{3-x}O₄) nanoparticles were synthesized with various molar ratios of Fe²⁺ to Co²⁺ ions in the initial salt solutions method with using contact non-equilibrium plasma. The crystal structure and morphology of the nanoparticles are obtained from X-ray diffraction and transmission electron microscopy studies. With an increase in the value of x, the saturation magnetization for the samples of CoFe₂O₄ has decreased from 150.9 emu/g to 1.2 emu/g. The dependence of the coercive force on x is extremal with a plateau maximum corresponding to the x=0.5-1.25.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1021-1023
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of organic coatings containing pigments with surface modified with a layer of ZnFe2O4
Autorzy:
Nechvílová, K
Kalendová, A
Powiązania:
https://bibliotekanauki.pl/articles/102579.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zinc ferrite
silicates
surface protection
organic coatings
Opis:
This work is focussed on the properties of organic coatings containing pigments whose surface was chemically coated with zinc ferrite (ZnFe2O4) layer. Four silicate types with different particle shapes were selected as the cores: diatomite, talc, kaolin and wollastonite. The untreated particles exhibit a barrier effect. The aim of this project was to apply the surface treatment approach with a view to enhancing not only the model paint films’ anticorrosion properties but also their resistance to physico- mechanical tests pursuant to ISO standards (cupping, bending, impact, adhesion). Other parameters examined included: particle size and morphology, density of the modified pigment, oil consumption, pH, conductivity, and electrochemical properties of the paint film. A solvent-based epoxy-ester resin was used as the binder and also served as the reference material. The pigment volume concentration (PVC) was 1% and 10%. During the last stage of the experiment, the paint films were exposed to a corrosive environment stimulating seaside conditions or conditions roads treated with rock salt. The accelerated cyclic corrosion test in a neutral salt mist atmosphere was conducted for 864 hours. The results served to ascertain a suitable environment for organic coatings.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 51-55
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Promotion of iron-oxide with potassium as optimization of the soot combustion catalyst
Autorzy:
Legutko, P.
Stelmachowski, P.
Kotarba, A.
Powiązania:
https://bibliotekanauki.pl/articles/115602.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
soot combustion
promotion
potassium
iron
ferrite
catalyst
Opis:
In this work the effect of potassium addition to iron oxides (FeO, Fe3O4, Fe2O3) as catalysts for soot combustion was investigated. While the addition of potassium by impregnation had positive effect on all oxides the strength of this effect varied considerably. Comparison with potassium ferrites (K2Fe22O34, KFeO2), with potassium as a part of a crystal lattice, proved that they were more active than unpromoted oxides. The determined range of activity was as follows: FeO < Fe3O4 Fe2O3 K/Fe34 ~ K2Fe22O34 K/Fe2O3 K/FeO ~FeO2.
Źródło:
Challenges of Modern Technology; 2012, 3, 2; 9-11
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-Induced Anisotropy and Stress Dependence of Saturation Magnetostriction in the Jiles-Atherton-Sablik Model of the Magnetoelastic Villari Effect
Autorzy:
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/355063.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetic hysteresis model
soft ferrite
magnetoelastic anisotropy
Opis:
The paper presents the results of the magnetoelastic Villari effect modelling in high-permeability Mn0.51Zn0.44Fe2.05O4 ferrite. Modelling was performed on the basis of measurements of magnetoelastic characteristics of frame-shaped samples. For the modelling, the corrected Jiles-Atherton-Sablik model was used. On the base of modelling results, the stress dependence of parameter k and stress-induced anisotropy were estimated. As a result the changes of saturation magnetostriction of Mn0.51Zn0.44Fe2.05O4 ferrite subjected to stresses were calculated. Such changes were previously observed experimentally. However, the phenomenon of stress-induced sign change of saturation magnetostriction was never previously explained quantitatively.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 607-612
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferrite content measurements in S32101 lean duplex stainless steel and its welded joints
Pomiary ferrytu w stali lean duplex S32101 i jej złączach spawanych
Autorzy:
Niagaj, J.
Mazur, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/354264.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pomiary ferrytu
stal lean
duplex S32101
lean duplex
welded joint
ferrite measurement
ferrite content
MAG
GMAW
Opis:
Due to their mechanical and plastic properties as well as unique corrosion resistance, two-phase lean duplex steels are increasingly popular in industrial applications e.g. for building waterside fixtures, ships, pipelines or containers. A critical factor of welded joints made of such steels is the balance between austenite and ferrite; the latter being measured by a special device called ferritoscope. The article contains the results of tests focused on measurements of ferrite content in S32101 lean duplex steel and its welded joints. The text also presents the impact of such factors as test sample thickness or shape and condition of measurement surface etc. on test results. In addition, this paper discusses the use of correction factors, describes problems arising during measurements of ferrite in welded joints and presents manners of the elimination of the latter. The conducted tests revealed that MAG method welding parameters affect the content of ferrite in butt welded joints produced with S32101 lean duplex steel.
Dwufazowe stale typu lean duplex z uwagi na ich własności wytrzymałościowe i plastyczne oraz szczególną odporność korozyjną są coraz częściej stosowane w przemyśle do budowy armatury nadbrzeżnej, statków, rurociągów lub zbiorników. W złączach spawanych z tych stali bardzo ważna jest równowaga pomiędzy austenitem i ferrytem. Pomiary zawartości ferrytu wykonuje sie za pomocą np. urządzenia typu ferrytoskop. W artykule przedstawiono wyniki badań zawartości ferrytu za pomocą ferrytoskopu w stali lean duplex S32101 i jej złączach spawanych oraz wpływ na wyniki pomiarów takich czynników jak: grubość mierzonej próbki, stan i kształt powierzchni pomiarowej itp. Omówiono stosowanie współczynników korekcyjnych. Wyszczególniono problemy powstające podczas wykonywania pomiarów ferrytu w złączach spawanych oraz sposoby ich niwelowania. Przeprowadzone badania wykazały, że parametry spawania metodą MAG mają wpływ na zawartość ferrytu w doczołowych złączach spawanych wykonanych ze stali lean duplex S32101.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 780-787
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Delta Ferrite on the Mechanical Properties of Dissimilar Ferritic-Austenitic Stainless Steel Welds
Autorzy:
Ghasemi, R.
Beidokhti, B.
Fazel-Najafabadi, M.
Powiązania:
https://bibliotekanauki.pl/articles/353040.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stainless steel
welding
delta ferrite
electron microscopy
austenite
Opis:
The dissimilar welds of AISI 304 to AISI 430 stainless steel was investigated by using gas tungsten arc welding. Three filler metals including ER309L, ER316L and ER2594 were applied. The weakest region of the welds was the heat affected zone of 430 stainless steel due to the formation of martensite. Also, the wide grain growth zone was observed in this side. The ferrite number for type 309L, 316L and 2594 weld metals was about 15, 32 and 57, respectively. The hardness and tensile strength values of the weld metals were higher than that of the heat affected zones and the base metals. The ferrite presented higher hardness values than the austenite in type 316L and 309L joints; while the hardness of austenite and ferrite was comparable in type 2594 weld metal.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 437-443
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role and position of iron in 0.8CaZrO3-0.2CaFe2O4
Autorzy:
Szczerba, J.
Śnieżek, E.
Stoch, P.
Prorok, R.
Jastrzębska, I.
Powiązania:
https://bibliotekanauki.pl/articles/146129.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
calcium ferrite
calcium zirconate
Mössbauer spectroscopy
perovskite
spinel
Opis:
The aim of the study was to characterize the 0.8CaZrO3-0.2CaFe2O4 composite structure with particular emphasis on the role and position of iron in the function of sintering temperature. The paper presents the results of 57Fe Mössbauer effect at room temperature. It was found that the increase of sintering temperature causes an increase in the amount of incorporated iron ions in the CaZrO3-crystal structure. Based on Mössbauer spectroscopy analysis, it was found that three different environments of Fe3+ ions were observed in the obtained materials. Two of them corresponded to CaFe2O4 phase and one was associated with the substitution of Zr4+ by Fe3+ in the CaZrO3 structure.
Źródło:
Nukleonika; 2015, 60, 1; 147-150
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ composite cathode for solid oxide fuel cell
Autorzy:
Mosiałek, M.
Kędra, A.
Krzan, M.
Bielańska, E.
Tatko, M.
Powiązania:
https://bibliotekanauki.pl/articles/355878.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
barium strontium cobalt ferrite
lanthanum strontium cobalt ferrite
solid oxide fuel cell
oxygen reduction reaction
electrochemical impedance spectroscopy
Opis:
Composite cathodes contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ were tested in different configuration for achieving cathode of area specific resistance lower than Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ cathodes. Electrodes were screen printed on samaria-doped ceria electrolyte half-discs and tested in the three electrode setup by the electrochemical impedance spectroscopy. Microstructure was observed by scanning electron microscopy. The lowest area specific resistance 0.46 and 2.77 Ω cm-2 at 700 °C and 600 °C respectively revealed composite cathode contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ in 1:1 weight ratio. The area specific resistance of this cathode is characterized by the lowest activation energy among tested cathodes.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1483-1488
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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