Temat: composite coatings - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Structure and Properties of Ni/Diamond Nanocrystalline Coatings
Autorzy:: Mazurek, A.
Trzaska, M.
Tematy:: diamond
nickel/diamond
composite coatings; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/350997.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of research of Ni/diamond composite coatings produced by electrochemical reduction method. Research was focused on composite coatings with nickel matrix and diamond as a disperse phase and for comparison purposes on nanocrystalline nickel coatings. Ni/diamond composite coatings were produced in baths with different content of nanodiamond powder. The structures of the dispersed phase and the composite coatings were analysed by using X-ray diffraction, scanning electron microscopy and light microscopy. Measurements of selected properties of the coatings were performed, including roughness, microhardness, adhesion and abrasive wear resistance. The research results indicate that the produced coatings have a compact structure and good adherence to steel substrate. Moreover, nanocrystalline Ni/diamond composite coatings exhibit greater hardness and reduced abrasive wear resistance compared to nanocrystalline nickel coatings.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Preparation and properties of nanocrystalline Ni/graphene composite coatings deposited by electrochemical method
Autorzy:: Cieślak, G.
Trzaska, M.
Tematy:: Graphene
electrodeposition
composite coatings
Ni/graphene coatings; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/949445.pdf Link otwiera się w nowym oknie
Opis:: The paper presents results of studies of composite nickel/graphene coatings produced by electrodeposition method on a steel substrate. The method of producing composite coatings with nanocrystalline nickel matrix and dispersion phase in the form of graphene is presented. For comparative purposes, the study also includes nano-crystalline Ni coatings produced by electrochemical reduction without built-in graphene flakes. Graphene was characterized by Raman spectroscopy, transmission and scanning electron microscopes. Results of studies on the structure and morphology of Ni and Ni/graphene layers produced in a bath containing different amounts of graphene are presented. Material of the coatings was characterized by SEM, light microscopy, X-ray diffraction. The microhardness of the coatings was examined by Knoop measurements. The adhesion of the coatings with the substrate was tested using a scratchtester. The influence of graphene on the structure and properties of composite coatings deposited from a bath with different graphene contents was determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Composite coatings with nickel matrix and graphene as dispersed phase
Autorzy:: Gajewska-Midziałek, A.
Tematy:: nickel
graphene
electrodeposition
composite coatings; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778669.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of the studies of nickel-graphene composite coatings deposited by the electrochemical reduction method. A bath with low concentration of nickel ions, graphene as dispersed particles and organic compounds were used for deposition of the composite coatings nickel-graphene. The results of investigations of coatings deposited from the electrolyte containing 0.33, 0.5 and 1 g/dm³ graphene and two surface-active compounds were shown. The particles content in the coatings, the surface morphology, the cross-sectional structures of the coated samples, thickness and internal stresses were measured. Voltammetric method was used for examination of the corrosion resistance of samples of composite coatings in 0.5 M NaCl solution. The obtained results suggest that the content of incorporated graphene particles increases with an increasing amount of graphene in plating bath. The applications of organic addition agents was advantageous because it caused compressive stresses in the coatings. All of the nickel-graphene composite coatings had better corrosion resistance than the nickel coatings.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Composite Coatings with Ceramic Matrix Including Nanomaterials as Solid Lubricants for Oil-Less Automotive Applications
Autorzy:: Posmyk, A.
Myalski, J.
Hekner, B.
Tematy:: composite coatings
nanotubes
nanowires
solid lubricants; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352408.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the theoretical basis of manufacturing and chosen applications of composite coatings with ceramic matrix containing nanomaterials as a solid lubricant (AHC+NL). From a theoretical point of view, in order to reduce the friction coefficient of sliding contacts, two materials are required, i.e. one with a high hardness and the other with low shear strength. In case of composite coatings AHC+NL the matrix is a very hard and wear resistant anodic oxide coating (AHC) whereas the solid lubricant used is the nanomaterial (NL) featuring a low shear strength such as glassy carbon nanotubes (GC). Friction coefficient of cast iron GJL-350 sliding against the coating itself is much higher (0.18-0.22) than when it slides against a composite coating (0.08-0.14). It is possible to reduce the friction due to the presence of carbon nanotubes, or metal nanowires.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effect of Various Organic Additives in Galvanic Bath on Properties of Ni-SiC Composite Coatings
Autorzy:: Nowak, M.
Mizera, J.
Kłyszewski, A.
Dobkowska, A.
Boczkal, S.
Kozik, A.
Koprowski, P.
Tematy:: organic additives
SiC
composite coatings
nickel coatings
zeta potential; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/357020.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the ceramic SiC particles. A Watts type galvanic bath modified with various organic additives was used. These additives were: 2-sulfobenzoic acid imide (LSA), dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate (SDS), tris (hydroxymethyl) aminomethane (THAM) and hexamethyldisilizane (HMDS). The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. Studies concerned the effect of the applied organic additives on properties of composite coatings such as: microstructure, microhardness, adhesion to the substrate, corrosion resistance and roughness. The structure of the coatings was assessed by scanning electron microscopy and light microscopy. Based on the studies of zeta potential it was found that the bath modification had a significant impact on the amount of the ceramic phase embedded in metal matrix. The tests conducted in a model 0.01 M KCl solution were not fully representative of the true behavior of particles in a Watts bath.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Improving the quality of technological surfaces of machines of composite coatings
Autorzy:: Dyl, T. C.
Starosta, R.
Tematy:: composite coatings
flame spraying
surface finishing
technological quality; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243120.pdf Link otwiera się w nowym oknie
Opis:: Nickel matrix coatings were sprayed by the Casto-Dyn 8000 torch on a steel substrate, and then subjected to straight turning. Determining of the optimum geometry of indexing is now synonymous with the selection of the optimum shape and dimensions of the insert and of an appropriate holder. According to cutting board, it was selected square, triangular, trigon inserts, made of carbide and of cubic boron nitride (borazon). Machining of nickel-based coatings was carried out for the cutting speed vc = 214 m/min in the case of treatment with borazon inserts, vc = 107 m/min in case of plates treated with tungsten carbide cutting, using the feed f =0.06 mm/rev and the depth of cut ap = 0.3 mm. Metal cutting the surface of steel samples coated with a composite coating containing 15% Al2O3 based on nickel, conducted for the cutting speed vc = 157 m/min when machining with borazon inserts and for vc = 83 m/min inserts with tungsten carbide for feed f = 0.06 mm/rev and depth of cut ap = 0.3 mm. Highly precise finishing of flame spraying composite and alloy coatings was carried out using turning by tool with borazon inserts. Flank (VB) and attack (KB) of turning tool wear while maintaining a constant length of spiral cutting (LSC) were determined. The effect of the shape and grade of inserts upon the geometric structure of the composite coatings and is considered in the paper. The article can determine the shape and grade of inserts is necessary to obtain sufficient quality of the shaft of centrifugal pumps with a composite coating.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Microstructure and properties of composite coatings obtained on aluminium alloys
Autorzy:: Bara, M.
Kmita, T.
Korzekwa, J.
Tematy:: composite coatings
hard anodising
Al2O3; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355423.pdf Link otwiera się w nowym oknie
Opis:: This paper presents methods of modifying the anode surface layers of Al₂O₃ by introducing carbon to their rnicrostructure. Composite coatings were prepared using two different methods. In the first, coatings were formed by means of oxidation under constant current conditions. Anodic oxidation of aluminium was conducted in a multicomponent electrolyte with the addition of organic acids and graphite. The second method was based on the formation of oxide coatings in an electrolyte without the addition of graphite or heat treatment of the layers of succinic acid. The obtained coatings were tested using SEM, TEM, and GDOES (glow discharge optical emission spectrometry) and their tribological and stereometric properties were measured. The study demonstrated the beneficial effects of the methods when used to improve the tribological properties of sliding couples.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Nickel Composite Coatings Reinforced Nano SiC Particles
Autorzy:: Nowak, M.
Mizera, J.
Kłyszewski, A.
Dobkowska, A.
Boczkal, S.
Kozik, A.
Koprowski, P.
Tematy:: nanoparticles
organic additives
SiC
composite coatings
nickel coatings
zeta potential; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356955.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the nano size SiC ceramic particles. The type and size of the ceramic particles or organic additives used play a important role during electrodeposition processes. A Watts type galvanic bath with various organic additives was used. These additives were: 2-sulfobenzoic acid imide, dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate, tris (hydroxymethyl) aminomethane and hexamethyldisilizane. The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. The work concerns the determination of the impact of the change in the zeta potential of SiC nanoceramic particles used on properties of composite coatings (wear resistance, corrosion, etc.). The paper characterized the composite nickel coatings on aluminum alloy using SEM techniques, wear resistance tests by TABER method and coating adhesion to the substrate using the “scratch test” method. The corrosion resistance of coatings was also tested using electrochemical methods. The research allowed to determine the effect of SiC nanoceramic particle size on the value of the zeta potential in the model KCl solution.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The finishing of composite coatings in aspect of surface roughness reduction
Autorzy:: Dyl, T. C.
Tematy:: composite coatings
flame spraying
cutting inserts
surface finishing; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242029.pdf Link otwiera się w nowym oknie
Opis:: The influence of the shape and grade of inserts upon the geometric structure of the composite coatings Ni-5%Al- 15%Al2O3 and alloy coatings of Ni-5% Al is considered in the paper. Nickel matrix coatings were sprayed by the Casto-Dyn 8000 torch on a steel substrate, and then subjected to straight turning. Determining of the optimum geometry of indexing is now synonymous with the selection of the optimum shape and dimensions of the insert and of an appropriate holder. According to cutting board it was selected square, triangular, trigon inserts, made of carbide and of cubic boron nitride (borazon). Machining of nickel-based coatings was carried out for the cutting speed vc = 214 m/min in the case of treatment with borazon inserts, vc = 107m/min in case of plates treated with tungsten carbide cutting, using the feed fn=0.06mm/rev and the depth of cut ap = 0.3 mm. Metal cutting the surface of steel samples coated with a composite coating containing 15% Al2O3 based on nickel, conducted for the cutting speed vc = 157 m/min when machining with borazon inserts and for vc = 83 m/min inserts with tungsten carbide for feed fn = 0.06 mm/rev and depth of cut ap = 0.3 mm. Highly precise finishing of flame spraying composite and alloy coatings was carried out using turning by tool with borazon inserts. Flank (VB) and attack (KB) wear coefficient of inserts while maintaining a constant spiral cutting length (SCL) were determined. Important elements parts (such as engines, pumps, centrifugal separators) are regenerated during long-term utilization. This paper proposes the use of regenerated technology subsonic flame thermal spraying and surface finishing by turning composite and alloy coatings of ship machinery parts.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Composite Nickel Coatings Produced on 6XXX Series Aluminium Alloys with the Addition of Vanadium
Kompozytowe powłoki niklowe wytwarzane na stopach aluminum serii 6XXX z dodatkiem wanadu
Autorzy:: Nowak, M.
Lech-Grega, M.
Kozik, A.
Mitka, M.
Gawlik, M.
Kłyszewski, A.
Tematy:: electrodeposition
composite coatings
vanadium
SiC
elektroosadzanie
powłoki kompozytowe
wanad; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/350892.pdf Link otwiera się w nowym oknie
Opis:: Studies of composite nickel coatings electrolytically deposited on aluminium alloys with different content of vanadium were described. Composite coatings were deposited from a Watts bath containing fine-dispersed SiC powder particles in an amount of 20 g/l and organic matters such as saccharin and sodium laurate. The morphology, structure and thickness of the obtained composite coatings were presented. The corrosion resistance of produced coatings was examined by electrochemical method. Basing on the results of studies it was found that coatings obtained with the sole addition of saccharin were characterized by numerous surface defects. The addition of sodium laurate eliminated the occurrence of defects caused by hydrogen evolution and the resulting coatings were continuous with good adhesion to the substrate. The distribution of the ceramic SiC phase in coatings was fairly uniform for all the examined variants of aluminium alloys. SEM examinations did not reveal the phenomenon of the ceramic particles agglomeration.
W pracy przedstawiono badania charakteryzujące kompozytowe powłoki niklowe osadzane elektrolitycznie na stopach aluminium z różną zawartością wanadu. Powłoki kompozytowe wytwarzano w kąpieli Wattsa z dodatkiem drobnodyspersyjnych cząstek proszku SiC w ilości 20 g/l oraz substancji organicznych takich jak sacharyna i laurynian sodu. Przedstawiono morfologię, strukturę, grubość uzyskanych powłok kompozytowych. Odporność korozyjną wytworzonych powłok badano metodą elektrochemiczną. Na podstawie przeprowadzonych badań stwierdzono, iż w przypadku powłok uzyskanych wyłącznie z dodatkiem sacharyny powłoki charakteryzują się licznymi wadami powierzchniowymi. Dodatek laurynianu sodu eliminuje występowanie wad spowodowanych wydzielaniem wodoru, a uzyskane powłoki są ciągłe oraz dobrze przyczepne do podłoża. Rozkład fazy ceramicznej SiC w powłoce jest w miarę równomierny dla wszystkich analizowanych wariantów stopów aluminium. Na podstawie obserwacji wykonanych za pomocą skaningowego mikroskopu elektronowego nie stwierdzono zjawiska aglomeracji cząstek ceramicznych.
Dostawca treści:: Biblioteka Nauki

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