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1

Application of the image analysis methods for the study of Al2O3 surafce coatings

Korzekwa Joanna, Gądek-Moszczak Aneta

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

406--411

EN

Anodic oxidation of aluminum alloy in a ternary solution of SFS (sulfuric, phthalic and oxalic acids) with 30g of tungsten disulfide (WS2) powder was carried out in order to obtain the aluminum oxide layer named in article as Al2O3/WS2 coatings. The microstructures of surface of obtained coatings were investigated. The subject of the analysis was a threadlike hill structure visible on the surface of coatings as bright ridges. The computer image analysis was performed in order to study the influence of electrolysis time and temperature of acids bath on the volume fraction VV of the area of the surface with filamentous hill’s structure.

2

Characterization of Oxide Layers Formed on 13CrMo4-5 Steel Operated for a Long Time at an Elevated Temperature

Gwoździk M.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 3A

1783--1788

EN

The paper contains results of studies into the formation of oxide layers on 13CrMo4-5 (15HM) steel long-term operated at an elevated temperature. The oxide layer was studied on a surface and a cross-section at the inner and outer surface of the tube wall. The 13CrMo4-5 steel operated at the temperature of 470°C during 190,000 hours was investigated. X-ray structural examinations (XRD) were carried out, microscope observation s using an optical, scanning microscope were performed. The native material chemical composition was analysed by means of emission spark spectroscopy, while that of oxide layers on a scanning microscope (EDS). The studies on the topography of the oxide layers comprised studies on the roughness plane, which were carried out using a AFM microscope designed for 2D and 3D studies on the surface. Mechanical properties of the oxide layer – steel (substrate) were characterised on the basis of scratch test. The adhesion of oxide layers, friction force, friction coefficient, scratching depth were determined as well as the force at which the layer was delaminated.

PL

Praca zawiera wyniki badań warstw tlenkowych powstałych na stali 13CrMo4-5 (15HM) długotrwale eksploatowanej w podwyższonej temperaturze. Badania przeprowadzono na powierzchni oraz na przekroju przy powierzchni wewnętrznej i zewnętrznej ścianki rury. Badana stal 13CrMo4-5 była eksploatowana w temperaturze 470oC w czasie 190000 godzin. Na badanym materiale przeprowadzono badania XRD, obserwacje mikroskopowe przy użyciu mikroskopu optycznego i skaningowego. Skład chemiczny stali badano na emisyjnym spektrometrze iskrowym natomiast poszczególnych warstw tlenkowych przy użyciu mikroskopu skaningowego za pomocą EDS. W ramach badań topografii warstw tlenkowych przeprowadzono badania chropowatości powierzchniowej, które realizowano przy zastosowaniu mikroskopu sił atomowych AFM przeznaczonego do badań 2D i 3D. Przeprowadzono charakterystykę mechanicznych właściwości warstwa tlenków – stal (podłoże) na podstawie badań za pomocą scratch testu. Określono przyczepność warstw tlenkowych, siłę tarcia, współczynnik tarcia, głębokość zarysowania oraz siłę, przy której warstwa uległa delaminacji.

3

Anodization of cast aluminium alloys produced by different casting methods

Labisz K., Dobrzański L.A., Konieczny J.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 3s

45--50

EN

In this paper the usability of two casting methods, of sand and high pressure cast for the anodization of AlSi12 and AlSi9Cu3 aluminium cast alloys was investigated. With defined anodization parameters like electrolyte composition and temperature, current type and value a anodic alumina surface layer was produced. The quality, size and properties of the anodic layer was investigated after the anodization of the chosen aluminium cast alloys. The Alumina layer was observed used light microscope, also the mechanical properties were measured as well the abrasive wear test was made with using ABR-8251 equipment. The researches included analyze of the influence of chemical composition, geometry and roughness of anodic layer obtained on aluminum casts. Conducted investigations shows the areas of later researches, especially in the direction of the possible, next optimization anodization process of aluminum casting alloys, for example in the range of raising resistance on corrosion to achieve a suitable anodic surface layer on elements for increasing applications in the aggressive environment for example as materials on working building constructions, elements in electronics and construction parts in air and automotive industry.

4

Warstwy tlenku glinu na węglikach spiekanych otrzymywane metodą MOCVD

Sawka A., Kwatera A., Juda W., Rakowski W.

Inżynieria Materiałowa

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2002

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R. XXIII, nr 5

387-389

PL

Warstwy Al2O3 syntezowano metodą MOCVD (Metal-Organic Chemical Vapour Deposition) z użyciem acetyloacetonianu glinu, czystego argonu (99,999% obj.) oraz powietrza. Warstwy te osadzano bezpośrednio na powierzchniach węglików spiekanych bez pośredniej warstwy TiC w zakresie temperatur 800-1000 stopni Celsjusza. Czas ich syntezy wynosił 15-120 min. Niektóre z otrzymanych warstw w 800 stopniach Celsjusza dodatkowo wygrzewano w temperaturze 850-1000 stopni Celsjusza. Warstwy poddano badaniom na mikroskopie skaningowym współpracującym z mikroanalizatorem dyspersji energii promieniowania rentgenowskiego (EDS). Wykonano również analizę rentgenowską, a także przeprowadzono pomiary mikrotwardości oraz badania na przyczepność warstw do podłoża.

EN

Alumina layers were synthesized by the MOCVD (Metal-Organic Chemical Vapour Deposition) method using aluminium acetylacetonate (Al(O2C5H7)3), pure argon (99,999% vol.) and air. Layers were deposited on cemented carbides with no intermediate layer of TiC in the temperature range of 800-1000 degrees centigrade. The time of their synthesis was 15-120 min. Some layers synthesized at 800 degrees centigrade were additionally annealed at 850-1000 degrees centigrade. The obtained layers were examined by scanning electron microscopy with EDS attachement. The phase composition of the layers was also investigated by X-ray analysis. The microhardness of the coats and their adhesion to the substrate were also measured.