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    Wyświetlanie 1-6 z 6
    Tytuł:
    Copper-Carbon Nanoforms Composites - Processing, Microstructure and Thermal Properties
    Autorzy:
    Pietrzak, K.
    Gładki, A.
    Frydman, K.
    Wójcik-Grzybek, D.
    Strojny-Nędza, A.
    Wejrzanowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/350995.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    sintering
    copper
    graphene
    thermal diffusivity
    Opis:
    The main current of publication is focused around the issues and problems associated with the formation of composite materials with Cu matrix and reinforcing phases in the various carbon nanoforms. The core of the research has been focused on thermal conductivity of these composites types. This parameter globally reflects the state of the structure, quality of raw materials and the technology used during the formation of composite materials. Vanishingly low affinity of copper for carbon, multilayered forms of graphene, the existence of critical values of graphene volume in the composite are not conducive to the classic procedures of composites designing. As a result, the expected, significant increase in thermal conductivity of composites is not greater than for pure copper matrix. Present paper especially includes: (i) data of obtaining procedure of copper/graphene mixtures, (ii) data of sintering process, (iii) the results of structure investigations and of thermal properties. Structural analysis revealed the homogenous distribution of graphene in copper matrix, the thermal analysis indicate the existence of carbon phase critical concentration, where improvement of thermal diffusivity to pure copper can occur.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Cu/SiC surface composite produced by friction stir processing
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/202068.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper
    metal matrix surface composite
    friction stir processing
    Opis:
    The main aim of this work was to obtain a copper matrix surface composite using friction stir processing (FSP). The reinforced phase was SiC particles with an average size of 5 mm. The effect of the reinforcement on the microstructure, hardness and wear behaviour were analysed. The friction treatment was carried out using a truncated cone-shaped tool with a threaded side surface. Multi-chamber technology was used to produce the composite microstructure in the copper surface layer. Changes in the material microstructure were assessed by light microscopy and scanning electron microscopy. Comparative measurement of the hardness of the initial and treated material as well as wear resistance tests were also carried out. A favourable effect of the surface treatment on the microstructure and properties of the copper was found. As a result of the friction treatment there was strong grain refinement in the copper surface layer. The average grain size in the stirring zone was about 3 mm and was over 21 times smaller than the average grain size in the initial material. Intensive dispersion of the SiC particles in the modified layer was also found, leading to the formation of a copper matrix composite. The effect of microstructural changes in the surface layer of the material and formation of the surface composite was an over two-fold increase in the hardness of the material and an increase in wear resistance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 555-564
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Properties of Copper Based MMC Strengthened with Alumina
    Autorzy:
    Kaczmar, J. W.
    Granat, K.
    Kurzawa, A.
    Grodzka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380691.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    copper
    alumina particles
    squeeze casting
    thermal conductivity
    electrical conductivity
    kompozyt
    miedź
    przewodność cieplna
    przewodność elektryczna
    Opis:
    The aim of this work is the development of Cu-Al2O3 composites of copper Cu-ETP matrix composite materials reinforced by 20 and 30 vol.% Al2O3 particles and study of some chosen physical properties. Squeeze casting technique of porous compacts with liquid copper was applied at the pressure of 110 MPa. Introduction of alumina particles into copper matrix affected on the significant increase of hardness and in the case of Cu-30 vol. % of alumina particles to 128 HBW. Electrical resistivity was strongly affected by the ceramic alumina particles and addition of 20 vol. % of particles caused diminishing of electrical conductivity to 20 S/m (34.5% IACS). Thermal conductivity tests were performed applying two methods and it was ascertained that this parameter strongly depends on the ceramic particles content, diminishing it to 100 Wm-1K-1 for the composite material containing 30 vol.% of ceramic particles comparing to 400 Wm-1K-1 for the unreinforced copper. Microstructural analysis was carried out using SEM microscopy and indicates that Al2O3 particles are homogeneously distributed in the copper matrix. EDS analysis shows remains of silicon on the surface of ceramic particles after binding agent used during preparation of ceramic preforms.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Addition of Zeolite Particles on the Performance Characteristics of Sintered Copper Matrix Composites
    Wpływ dodatku cząstek zeolitu na właściwości eksploatacyjne spiekanego kompozytu o osnowie miedzi
    Autorzy:
    Kargul, M.
    Borowiecka-Jamrozek, J.
    Konieczny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/190340.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    sinter
    copper
    zeolite
    metal matrix composite
    wear resistance
    spiek
    miedź
    zeolit
    kompozyt z metalową osnową
    odporność na zużycie ścierne
    Opis:
    The paper presents the results of research on the possibilities of producing and using copper–zeolite composites obtained by powder metallurgy. The zeolite powder (0.0–0.2 mm fraction) used in the experiments was ground tuff rock extracted from the Kucin Quarry (VSK PRO-ZEO s.r.o.) in Slovakia. The as-delivered material was imaged and analysed using the SEM/EDS and XRD techniques. Before the sintering process, one-sided pressing was applied to the hydraulic press at a pressure of 620 MPa. The sintering process was carried out in a laboratory tube furnace at 900°C in an atmosphere of dissociated ammonia. The sintering time was 60 minutes. The resulting agglomerates were subjected to the following tests: measurements of density, hardness, electrical conductivity, and abrasion resistance. Observations of the microstructure on metallographic specimens made from the sintered samples were also performed using a scanning electron microscope (SEM). Zeolite was introduced into the copper matrix in the amounts of 2.5, 5, 7.5, and 10% by weight. The introduction of zeolite particles into the matrix as the strengthening phase caused an increase in the hardness of sinters while lowering a density and electrical conductivity. The introduction of zeolite particles caused a decrease in abrasion resistance for a composite containing up to 7.5% zeolite. The increase in abrasion resistance was observed for the composite containing 10% zeolite particles.
    W pracy przedstawiono wyniki badań nad możliwościami wytwarzania i zastosowania kompozytu miedź– –zeolit otrzymanego za pomocą technologii metalurgii proszków. Proszek zeolitu (frakcja 0.0–0.2 mm) wykorzystany do badań pozyskano ze skały zwanej tufem zeolitowym, wydobywanej w kopalni Kucice, (VSK PRO-ZEO s.r.o.), Słowacja. Proszek zeolitu został poddany obserwacjom SEM/EDS oraz rentgenowskiej analizie fazowej XRD. Przed procesem spiekania zastosowano jednostronne prasowanie na prasie hydraulicznej przy ciśnieniu prasowania 620 MPa. Proces spiekania przeprowadzono w laboratoryjnym piecu rurowym w temp 900°C w atmosferze zdysocjowanego amoniaku. Czas spiekania wynosił 60 minut. Wytworzone spieki poddano następującym badaniom: pomiarowi gęstości, twardości, przewodności elektrycznej oraz odporności na zużycie ścierne. Przeprowadzono również obserwacje mikroskopowe zgładów metalograficznych wykonanych z badanych spieków z użyciem skaningowego mikroskopu elektronowego (SEM). Zeolit wprowadzono do miedzianej osnowy w ilościach 2,5, 5, 7,5, 10% wagowych. Wprowadzenie do osnowy cząstek zeolitu jako fazy umacniającej spowodowało podwyższenie twardości spieków, natomiast obniżenie gęstości i przewodności elektrycznej. Wprowadzenie cząstek zeolitu w ilości do 7,5% spowodowało obniżenie odporności na zużycie ścierne. Wzrost odporności na zużycie ścierne zaobserwowano dla kompozytu zawierającego 10% zeolitu.
    Źródło:
    Tribologia; 2018, 282, 6; 51-62
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending strength and fracture investigations of Cu based composite materials strengthened with \delta-alumina fibres
    Autorzy:
    Kaczmar, J. W.
    Granat, K.
    Naplocha, K.
    Kurzawa, A.
    Grodzka, E.
    Samociuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/383012.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    copper
    alumina fibre
    squeeze casting
    bending strength
    kompozyt metalowy
    miedź
    włókno aluminiowe
    prasowanie stopu
    wytrzymałość na zginanie
    Opis:
    Bending strength, thermal and electric conductivity and microstructure examinations of Cu based composite materials reinforced with Saffil alumina fibres are presented. Materials were produced by squeeze casting method applying the designed device and specially elaborated production parameters. Applying infiltration pressure of 90MPa and suitable temperature parameters provided manufacturing of copper based composite materials strengthened with Saffil alumina fibres characterized by the low rest porosity and good fibre-matrix interface. Three point bending tests at temperatures of 25, 100 and 300ºC were performed on specimens reinforced with 10, 15 and 20% of Saffil fibres. Introduced reinforcement effected on the relatively high bending strengths at elevated temperatures. In relation to unreinforced Cu casting strength of composite material Cu – 15vol.% Saffil fibres increase by about 25%, whereas at the highest applied test temperature of 300ºC the improvement was almost 100%. Fibres by strengthening of the copper matrix and by transferring loads from the matrix reduce its plastic deformation and hinder the micro-crack developed during bending tests. Decreasing of thermal and electrical conductivity of Cu after incorporating fibres in the matrix are relatively small and these properties can be acceptable for electric and thermal applications.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 59-63
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological properties of Cu based composite materials strengthened with Al2O3 particles
    Autorzy:
    Kaczmar, J.
    Granat, K.
    Grodzka, E.
    Kurzawa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381312.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    copper
    aluminium oxide particles
    tribological properties
    wear resistance
    friction coefficient
    Pin-on-disc tester
    kompozyt metalowy
    miedź
    tlenek aluminium
    właściwości tribologiczne
    odporność na ścieranie
    współczynnik tarcia
    Opis:
    In the present work copper was strenghtened with 20 and 30 vol. % of alumina particles characterized by diameter of 3-6μm. The copper based composite materials were manufactured by the squeeze casting method. Preheated preforms made from Al2O3 particles were placed in the desired place in the heated cast die and the squeeze casting process with liquid copper was performed applying the infiltration pressure of 90MPa and pressure was kept for 10-15s until solidification was complete. The microstructure and physical properties: Brinell hardness (HBW) and density were characterized. Metallografic examinations showed that alumina particles were uniformly distributed in the copper matrix. Hardness of 208 HBW for composite materials containing 30 vol.% of particles was achieved. Wear investigations were performed applying the tribological pin-on-disc tester. Friction forces between copper based composite materials containing 20 and 30 vol. % of Al2O3 particles and cast iron were registered and wear was determined on the base of the specimen mass loss after 1.0, 3.5 and 8.5 km friction distance.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 33-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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