Autor: Kopia, A. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Characterisation of Oxide Coatings Produced on Aluminum Alloys by MAO and Chemical Methods
Autorzy:: Jędrusik, M.
Dębowska, A.
Kopia, A.
Tematy:: MAO
chemical method
corrosion resistance
aluminium alloys
Al2O3; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354014.pdf Link otwiera się w nowym oknie
Opis:: The study compared the properties of oxide coatings formed on aluminium alloys produced by: MAO (micro – arc oxidation), and the chemical method (oxidation in acid). Morphology, microstructure and of the coatings was analysed with a scanning electron microscope SEM. Corrosion resistance were tested in potentiometer – dynamic. The layers produced by MAO significantly improved corrosion resistance. Coatings produced after 3 minutes of oxidation had better corrosion resistance than the coatings after 5 minutes of oxidation. The layers produced by chemical method didn’t improve corrosion resistance of aluminium alloy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Perovskite La1-xSrxFeO3 Thin Films Deposited by Laser Ablation Process
Autorzy:: Cyza, A.
Cieniek, Ł.
Kopia, A.
Tematy:: Perovskite LaFeO3
thin films
gas sensors
PLD; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352657.pdf Link otwiera się w nowym oknie
Opis:: The aim of the research was to investigate the influence of strontium on the structure of thin films La1-xSrxFeO₃ (x = 0; 0,1; 0,2). The LaFeO₃ and Sr-doped LaFeO₃ films were produced by pulsed laser deposition (PLD) on Si (100) substrate using the Nd-YAG (λ = 266 nm) laser. SEM, AFM and XRD methods were used to characterize the structure and morphology of the thin films. X-Ray Diffraction analysis showed only the LaFeO₃ phase in the undoped thin film and the La0.9Sr0.1O3 and La0.8Sr0.2O₃ phases in thin films doped by Sr. The mean crystallite size, calculated by Williamson-Hall method, was smaller (of the order of 18 nm) in films doped by Sr. SEM analysis showed small droplets in thin films doped by Sr. Highly developed surface layer was observed using the AFM microscope for thin films doped by Sr.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Microstructure, Chemical and Phase Composition of Clad Layers of Inconel 625 and Inconel 686
Autorzy:: Solecka, M.
Kopia, A.
Petrzak, P.
Radziszewska, A.
Tematy:: Inconel 625
Inconel 686
SEM
EDS
TEM; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351519.pdf Link otwiera się w nowym oknie
Opis:: The article presents the investigation results of microstructural, chemical composition changes after clad layers of Inconel 625 and Inconel 686 alloys weld overlaid on boiler tubes. The boiler tubes made of 16Mo3 steel were cladded in the Boiler Factory SEFAKO S.A. using CMT technique. The microstructure and chemical composition of coatings were analysed using light microscopy, scanning and transmission electron microscopy. The value of the partition coefficient k was determined for Inconel 625 and Inconel 686 clad layers. The value was calculated by dividing the average content (% wt.) of Ni, Cr, Mo, Fe, Nb and W.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Structural Characterization of $La_{1-x}Sr_xCoO_3$ Thin Films Deposited by Pulsed Electron Deposition Method
Autorzy:: Cieniek, Ł.
Kopia, A.
Cyza, A.
Kowalski, K.
Kusiński, J.
Tematy:: 81.15.-z
81.10.Bk
81.07.Bc
68.55.-a
68.55.J-
68.55.Nq
68.37.-d; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398370.pdf Link otwiera się w nowym oknie
Opis:: The aim of the presented research was to investigate the influence of strontium dopant on the structure and composition of $La_{1-x}Sr_{x}CoO_3$ (x=0, 0.1, 0.2) perovskite thin films. Pure and Sr doped LaCoO₃ thin films were grown by pulsed electron deposition technique on crystalline epi-polished Si/MgO substrates. Numerous analytical techniques (scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction) were applied to characterize their phase/chemical composition, structure and surface morphology. X-ray diffraction analysis showed the presence of pure LaCoO₃ perovskite phase in the undoped thin film. For Sr doped thin films $La_{0.8}Sr_{0.2}CoO_3$ (x=0.2), $La_{0.9}Sr_{0.1}CoO_3$ (x=0.1) small contents of La₂ O₃ and LaSrCoO₄ phases were noticed. The crystallite sizes, calculated from the Williamson-Hall plots, were about 18 nm for all analyzed films. According to scanning electron microscopy/atomic force microscopy observations, obtained thin films were free from defects and cracks. Atomic force microscopy (tapping mode) analysis revealed the differences in the shape and quantity of surface crystallites for all thin films as a result of Sr doping and different deposition parameters. Atomic force microscopy technique also allowed measurement of roughness parameters for analyzed samples. X-ray photoelectron spectroscopy analyses of chemical states of elements of thin films showed that their chemical state was stable across the film thickness and even at the interface with the MgO substrate. X-ray photoelectron spectroscopy analysis also allowed to evaluate chemical states and atomic concentration of La, Co, and Sr elements within cross-sections of deposited thin films.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Deposition Of Oxide And Intermetallic Thin Films By Pulsed Laser (PLD) And Electron Beam (PED) Methods
Osadzanie tlenkowych oraz międzymetalicznych cienkich filmów z wykorzystaniem lasera impulsowego (PLD) i wiązki elektronowej (PED)
Autorzy:: Kusiński, J.
Kopia, A.
Cieniek, Ł.
Kąc, S.
Radziszewska, A.
Tematy:: PLD
PED
thin film
structure
doped oxides
cienki film
struktura
osadzanie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352325.pdf Link otwiera się w nowym oknie
Opis:: In this work the pulsed laser deposition (PLD) and the pulsed electron beam deposition (PED) techniques were used for fabrication of Mo-Bi₂O₃, La_1-xSr_xCoO₃, La_1-xCa_xCoO₃ and Al-Mg thin films. An influence of ablation process basic parameters on the coatings structure and properties was discussed. Two types of laser ablation systems were applied: one equipped with a KrF excimer and second with a Q-switched Nd:YAG. Films were deposited on Si and MgO substrates. Scanning (SEM) and transmission (TEM) electron microscopy, atomic force microscopy (AFM) as well as X-ray diffraction (XRD) were used for structural analysis. Investigations focused on structure and chemical composition showed that smooth and dense thin films with nanocrystalline structure, preserving the composition of the bulk target, could be obtained by the both PLD and PED techniques. Research study showed that by a proper selection of PLD and PED process parameters it was possible to deposit films with significantly decreased amount and size of undesirably nanoparticulates.
Osadzanie laserem impulsowym (PLD) oraz osadzanie impulsową wiązka elektronową (PED) wykorzystane zostało do wytwarzania cienkich filmów typu: Mo-Bi₂O₃, La_1-xSr_xCoO₃, La_1-xCa_xCoO₃ and Al-Mg oraz Al-Mg. Dyskutowano wpływ podstawowych parametrów procesu ablacji na strukturę i właściwości uzyskiwanych powłok. Wykorzystane zostały dwa typy systemów do ablacji; jeden z ekscymerowym laserem KrF i drugi na bazie lasera Nd:YAG z modulatorem dobroci (Q-Switch). Filmy osadzano na podłożu Si i MgO. Skaningowa (SEM) i transmisyjna (TEM) mikroskopia elektronowa, mikroskopia sił atomowych (AFM), oraz dyfrakcja rentgenowska (XRD) wykorzystana została do analizy strukturalnej. Badania skoncentrowane na strukturze i składzie chemicznym wykazały jednorodną i zwartą budowę cienkich nanokrystalicznych filmów uzyskanych metodami PLD i PED utrzymujących skład odparowywanych tarcz. Wykazano doświadczalnie, że odpowiednie dobranie parametrów procesu pozwala otrzymywać filmy o istotnym zminimalizowaniu ilości i wymiarów niekorzystnych nanocząstek w powłoce.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Erosive Wear of Inconel 625 Alloy Coatings Deposited by CMT Method
Autorzy:: Solecka, M.
Kopyściański, M.
Kusiński, J.
Kopia, A.
Radziszewska, A.
Tematy:: Inconel 625
erosion wear
solid particles erosion
alloys; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/357042.pdf Link otwiera się w nowym oknie
Opis:: The article presents the investigation results concerning the determination of the characteristics of erosive wear caused by the impact of Al2O3 solid particles on the surface of Inconel 625 alloy after plastic working and the same material after weld cladding process using the CMT method. Erosion wear tests were performed at two temperatures: 20°C and 650°C. The erosion tests were conducted using the standard ASTM G76. A jet with a specified abrasive waight was directed to the surface of the tested material at an α impingement angle varied in the range of 30-90° at a velocity imparted to the abrasive by the medium, which was compressed air. The eroded surface was examined using a scanning electron microscope (SEM), while the depths of craters caused by the erosion tests were measured with an optical profilometer. The predominant mechanisms of the formation of mass losses during solid particle erosion were microcutting and microfissuring.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Structural Characterization of LaCoO3 Thin Films Grown by Pulsed Laser Deposition
Autorzy:: Jędrusik, M.
Cieniek, Ł.
Kopia, A.
Turquat, C.
Leroux, C.
Tematy:: PLD
thin films
perovskites
LaCoO3; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354709.pdf Link otwiera się w nowym oknie
Opis:: Thin films of crystallized LaCoO₃ were grown on Si substrate by Pulsed Laser Deposition at different temperatures (750°C, 850°C and 1000°C). The structural characterization of the LaCoO₃ thin films was done by combining several techniques: Scanning Electron Microscopy (SEM), Atomic Force Microscope (AFM), Transmission Electron Microscopy (TEM) and Grazing Incidence X-Ray Diffraction (GIXRD). The thin films crystallized in the expected rhombohedral phase whatever the deposition temperature, with an increase of crystallite size from 70 nm at 750°C to 100 nm at 1000°C, and an average thickness of the thin films of less than 200 nm. At 850°C and 1000°C, the thin films are crack-free, and with a lower number of droplets than the film deposited at 750°C. The grains of LaCoO₃ film deposited at 850°C are columnar, with a triangular termination. At 1000°C, an intermediate layer of La₂ Si₂ O₇ was observed, indicating diffusion of Si into the deposited film.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Surface Characterization of 309 and 310 Steel after the Corrosion in Wood Biomass Ash
Autorzy:: Dębowska, A.
Kopia, A.
Kalemba-Rec, I.
Petrzak, P.
Magdziarz, A.
Tematy:: 61.66.Dk
61.05.cp
68.37.Hk
88.20.dd; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032929.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study was to investigate the influence of biomass ashes - specifically wood biomass ash - on the surface of austenitic stainless steel 309 and 310. The process was carried out for 1000 h at 650°C. The microstructure and chemical composition of corrosion products were examined by scanning electron microscopy with energy dispersive spectroscopy analysis. Phase analysis of corrosion product were done by X-ray diffraction and ash composition was investigated by X-ray fluorescence. It was observed that wood biomass ash caused the corrosion of the steel surface. On the surface of the steels exposed to wood biomass ash the layer of corrosion products was observed, mostly chromium, nickel and iron oxide. The thickness of mill scale formed during the process was in the range of h=15-30 μm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: High-temperature corrosion of Ni-base alloys by waste incineration ashes
Autorzy:: Solecka, M.
Kusiński, J.
Kopia, A.
Rozmus-Górnikowska, M.
Radziszewska, A.
Tematy:: 81.05.Bh
68.47.Gh
68.37.Hk
61.05.cp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1112555.pdf Link otwiera się w nowym oknie
Opis:: Ni-Cr-Mo alloys, e.g. Inconel 625 and 686, exhibit high-temperature corrosion, oxidation and wear resistance. For this reason, these alloys are typically used as a coating material in different environments as effective solid-state diffusion barriers between the corrosive atmosphere and the base metal. To perform: the Ni-base weld overlays, without introducing too much Fe, a new welding technique called cold metal transfer was used. High-temperature corrosion of boiler parts during incineration of waste was investigated. Boiler tubes were coated with Inconel 625 and Inconel 686 nickel alloys and, after subjecting them to waste incineration ashes, they were examined by scanning electron microscopy with energy dispersive X-ray spectrometer to reveal different corrosion mechanisms and their causes. Results indicate a strong dependence of the boiler steel corrosion on anions in the incineration waste ash. X-ray diffraction characteristics of the scale showed that surface corrosion processes induce the formation of CrO₂, NiO. The presence of iron in the clad weld surface is conductive to the formation of the Fe₂O₃ oxide.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Characterization of oxide layers made on aluminum alloy 7075 by different methods
Charakterystyka warstw tlenkowych wytworzonych na stopie aluminium 7075 z zastosowaniem różnych metod
Autorzy:: Jędrusik, M.
Dębowska, A.
Kopia, A.
Petrzak, P.
Koclęga, D.
Kalemba-Rec, I.
Tematy:: oxide layers
aluminum alloy 7075
micro-arc oxidation
phosphate coating
chemical method
warstwy tlenkowe
stop aluminium 7075
MAO
fosforanowanie
metoda chemiczna; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/263954.pdf Link otwiera się w nowym oknie
Opis:: Aluminum and aluminum alloys are now being widely used as materials for structural applications due to a number of valuable properties. Improvement in the functional and decorative properties of aluminum can be obtained by forming an oxide layer on its surface. The aim of the present study was to produce and compare the properties of oxide layers on the surface of aluminum alloy 7075 and compare their properties. The methods that were used during the study were as follows: phosphating, micro-arc oxidation, and a chemical method involving the formation of a passive layer. The layers were subjected to corrosion tests. SEM and EDS methods were used for characterization of the received results. Also, some tests on an optical profilometer were done. It was proven that the micro-arc oxidation method allowed us to obtain a layer with the greatest thickness and highest corrosion resistance.
Glin i jego stopy są obecnie powszechnie wykorzystywanym materiałem do zastosowań konstrukcyjnych ze względu stosunek masy do wytrzymałości. Poprawę własności funkcyjnych i dekoracyjnych aluminium uzyskać można przez wytworzenie warstwy tlenku na jego powierzchni. Celem badań było wytworzenie warstw tlenkowych na podłożu ze stopu aluminium 7075 i porównanie ich właściwości. Zastosowano trzy metody: fosforanowanie, micro-arc oxidation oraz metodę chemiczną polegającą na wytworzeniu warstwy pasywnej. Otrzymane powłoki poddano testom korozyjnym oraz charakteryzowano z zastosowaniem następujących metod: SEM, EDS. Wykonano też badania na profilometrze optycznym. Metoda micro-arc oxidation pozwala na uzyskanie warstwy o największej grubości oraz najlepszej odporności na korozję.
Dostawca treści:: Biblioteka Nauki

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