Nanocomposites alumina/Pt produced by PVD and thermal oxidation methods used in catalytic applications

Reszka, Kazimierz

doi:10.1016/j.vacuum.2007.01.048

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…7). The horizontal delamination of Si layer may occur over these areas (2), due to direct contact with the oxide layer and the layer created over the compensation grain.…”

Section: Resultsmentioning

confidence: 99%

“…The unchanging nature of the grain growth oriented perpendicularly to the areas where crystallization was initiated, is maintained. It applies both to steel base (1), and to the space filled with a large amount of oxides (2). As far as these areas are concerned, only a slightly smaller thickness of the layer might be observed.…”

Section: Resultsmentioning

confidence: 99%

“…The share of the main components of an alloy, from which the wire was produced, was as follows: 4.8 wt.% Al, 20.9 wt.% Cr, 0.22 wt.% Si, other additives <1 %, and Fe. On the basis of electron microscopy examination, it was found that the surface of the wire was covered by amorphous oxide nanolayer, which might have been formed naturally due to prolonged exposition to atmosphere and possibly during the technological process of the wire forming [1][2][3]. Examination of the wires surface as well as the profiles of breaking points has been performed with an optical metallographic microscope Nikon MA200 with a large depth of field.…”

Section: Methodsmentioning

confidence: 99%

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The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

Szczypiński¹,

Reszka

Szczypiński

2018

Materials Science-Poland

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The subject of this research is the structure of a Si nanolayer deposited on a FeCrAl wire surface by means of magnetron sputtering method. Si layer was selected as one of possible protections of the wire surface against excessive corrosive-erosive wear. In order to increase the power necessary for the DC discharge of the magnetron with Si cathode, a second magnetron with an aluminum disc as a cathode was used. The wire was attached to a carousel holder to ensure its rotation around the magnetron. The thickness of the deposited layers was about 150 nm. A wire surface examination indicated the presence of defects such as gaps between grains, cavities as well as severely deformed grains of surface layer. The research was conducted on the sample sections which had been prepared by focused ion beam method (FIB). The technique of transmission microscopy, which was used for observation, allowed us to obtain images in bright field (BF), dark field (DF), as well as in high resolution (HREM). The studies were also performed on the wire surface after the cutting process of the expanded polystyrene blocks. A metallographic optical microscope Nikon MA200 with a large depth of field was used for the examination which showed the presence of carbon deposit products. Additionally, a composition microanalysis was carried out along the line within selected areas of samples, with the use of energy dispersive spectroscopy (EDS). A large impact of wire surface defects on Si layer forming was found as well as a high direct homogeneous growth. The examination of the sections indicated the existence of a mechanism of defects sealed by Si layer, where directionality of grains growth in these areas revealed the tendency for vertical location relative to defects surface. Consequently, closed nanopores, i.e. spaces not covered with Si layer, were created. It is a characteristic feature of areas with defects covered with an oxide film created in a natural way.

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“…7). The horizontal delamination of Si layer may occur over these areas (2), due to direct contact with the oxide layer and the layer created over the compensation grain.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

Szczypiński¹,

Reszka

Szczypiński

2018

Materials Science-Poland

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“…For depositing the Al-films, the vacuum apparatus [4,5] fitted with two magnetron constant-current sources, where the targets made of aluminium plates (purity 99.99) were used. The deposition of films was carried out on pieces of foils 35 mm × 35 mm × 0.005 mm in dimension made of Fe20Cr5Al steel.…”

Section: Deposition Of Metallic Al-filmsmentioning

confidence: 99%

Influence of Substrate Local Heating on Morphology of Al and Al₂O₃Nanofilms

Reszka

Szczypiński²,

Pomorska

2011

Acta Phys. Pol. A

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Experimental investigations presented in this work were focused on the execution of a carousel system with its usability for step-by-step revolutions and the mechanism for clamping the heater, which made it possible to heat substrates individually within the range from 25• C to 300• C. This system was used for depositing the metallic Al films by the magnetron sputtering method on foil made of FeCrAl steel, which found application in the production of metallic catalytic reactors. It was found that in the case of not-heated foil the polycrystalline continuous Al film, which is separated from steel by an amorphous oxide nanofilm obtained spontaneously under influence of weather conditions, was created. The deposition of aluminium on foil heated to the temperature of 300• C caused the film marked by fine grains integrated with small forces to be formed. These differences had an influence on the morphology of the oxide films.

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“…The object of testing was Fe -19Cr -5Al steel foil 0.05 mm in thickness that was coiled into packets [3,4] of a honeycomb cross-section composed of 4 flat foil strips and 4 corrugated foil strips of a total surface area equal to 21260mm 2 . The strips prior to oxidation were two-sided coated with metallic nanofilms using the vacuum setup equipped with two DC magnetrons, Al and Pt cathodes 18-40 and a carousel fixture in the form of a cylinder [5].…”

Section: Materials and Manufacturing Processesmentioning

confidence: 99%

Oxide Films Produced on Fe<sub>19</sub>Cr<sub>5</sub>Al Steel Coated with Al, Pt and Al+Pt Composite Nanofilms: Technological Aspects and Catalytic Properties

Reszka

Żurek

Morgiel

et al. 2008

AMR

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Nanocomposites alumina/Pt produced by PVD and thermal oxidation methods used in catalytic applications

Cited by 7 publications

References 3 publications

The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

Influence of Substrate Local Heating on Morphology of Al and Al₂O₃Nanofilms

Oxide Films Produced on Fe<sub>19</sub>Cr<sub>5</sub>Al Steel Coated with Al, Pt and Al+Pt Composite Nanofilms: Technological Aspects and Catalytic Properties

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Nanocomposites alumina/Pt produced by PVD and thermal oxidation methods used in catalytic applications

Cited by 7 publications

References 3 publications

The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

Influence of Substrate Local Heating on Morphology of Al and Al2O3Nanofilms

Oxide Films Produced on Fe<sub>19</sub>Cr<sub>5</sub>Al Steel Coated with Al, Pt and Al+Pt Composite Nanofilms: Technological Aspects and Catalytic Properties

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Influence of Substrate Local Heating on Morphology of Al and Al₂O₃Nanofilms