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Wyszukujesz frazę "copper powder" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Study of Copper Alloy with Graphene Additive via x-Ray Diffraction
    Autorzy:
    Masri, Mohamad Najmi
    Mohammad, M.
    Yusoff, Mahani
    Mamat, Sarizam
    Teo, Pao Ter
    Othman, R.
    Irfan, Abd Rahim
    Singh, Pramod K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134097.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloy
    graphene
    powder metallurgy
    copper
    zinc
    Opis:
    This study evaluated the effect of milling speed and compaction pressure on the densification and morphology of the CuZn-Gr composite. The composite was prepared by using the powder metallurgy technique. The effect on the microstructural and compaction was determined based on different milling speeds. The different milling speeds involved were 175, 200, 225, and 250 rpm. Meanwhile, the different compaction pressures used in this study were 127, 250, 374, and 500 MPa. The properties of the milled powder gave the result to green density and densification parameters. The XRD pattern of Cu and Zn broadened as milling time increased.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1051--1053
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic, isotherm and thermodynamics investigation on adsorption of divalent copper using agro-waste biomaterials, Musa acuminata, Casuarina equisetifolia L. and Sorghum bicolor
    Autorzy:
    Mokkapati, R.P.
    Mokkapati, J.
    Ratnakaram, V.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/778519.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    banana bunch-stem powder
    casuarinas fruit powder
    sorghum stem powder
    removal
    copper
    adsorption
    Opis:
    Three novel and distinct agricultural waste materials, viz., Casuarinas fruit powder (CFP), sorghum stem powder (SSP) and banana stem powder (BSP) were used as low cost adsorbents for the removal of toxic copper(II) from aqueous solutions. Acid treated adsorbents were characterized by SEM, EDX and FTIR. Different factors effecting adsorption capacity were analyzed and the efficiency order was BSP>SSP>CFP. Based on the extent of compatibility to Freundlich/Langmuir/D-R/Temkin adsorption isotherm and different models (pseudo-first and second order, Boyd, Weber’s and Elovich), chemisorption primarily involved in the case of CFP and SSP, whereas, simultaneous occurrence of chemisorption and physisorption was proposed in the case of BSP. Based on the observations, it was proposed that three kinetic stages involve in adsorption process viz., diffusion of sorbate to sorbent, intra particle diffusion and then establishment of equilibrium. These adsorbents have promising role towards removal of Cu(II) from industrial wastewater to contribute environmental protection.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 2; 68-77
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced processing for recycling of iron scrap with impurities
    Autorzy:
    Osawa, Y.
    Takamori, S.
    Minagawa, K.
    Kakisawa, H.
    Halada, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146109.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    recycling
    steel scrap
    copper
    aluminum
    powder metallurgy
    cast iron
    Opis:
    The present research focuses on the recycling of steel in combination with copper or aluminum alloys. To use iron scrap with a copper content in the range of 0.5 to 15%, a water atomization process was carried out, producing a rapidly solidified powder with copper of nano-order size dispersed in it. The powder was then hot rolled in the 600°C to 1000°C temperature region, where there is no liquid phase of copper, to produce a solid body. The solid bodies obtained presented a porosity of less than 1% for all the values of temperature and copper concentration, and it was established that the proposed process can be used for a wide range of concentrations of metallic impurities. The tensile strength increased with the copper content for all the temperatures, reaching stability at a copper concentration over 5%. Rapidly solidified powder was annealed and compacted at 600°C, resulting in a reduction of strength compared to non-annealed powder. The microstructure with a finely dispersed copper content seemed to have a considerable effect on the tensile strength of the compacted bodies. In the case of the use of aluminum-containing iron scrap, the results show that addition of aluminum to cast iron increased the resistance to abrasion, the high temperature oxidation characteristics, and the vibration control characteristics. When this cast iron was kept in air at temperatures ranging from 800°C to 1000°C, it was observed that the graphite on the surface was substituted by alumina.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 113-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characteristics of Copper- Intermetallics Composites
    Autorzy:
    Kargul, M.
    Konieczny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/947625.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composites
    powder metallurgy
    sintering
    copper
    titanium
    kompozyty
    metalurgia proszków
    spiekanie
    miedź
    tytan
    Opis:
    The paper presents the results of research on the production and application of sintered copper matrix composite reinforced with titanium-copper intermetallic phases. Cu- Ti composites were fabricated by powder metallurgy. The starting materials for obtaining the sintered composites were commercial powders of copper and titanium. Experiments were carried out on specimens containing 2.5, 5, 7.5 and 10 % of titanium by weight. Finished powders mixtures containing appropriate quantities of titanium were subjected to single pressing with a hydraulic press at a compaction pressure of 620 MPa. Obtained samples were subjected to sintering process at 880°C in an atmosphere of dissociated ammonia. The sintering time was 6 hours. The introduction of titanium into copper resulted in the formation of many particles containing intermetallic phases. The obtained sinters were subjected to hardness, density and electrical conductivity measurements. Observations of the microstructure on metallographic specimens made from the sintered compacts were also performed using a optical microscope. An analysis of the chemical composition (EDS) of the obtained composites was also performed using a scanning electron microscope. Microstructural investigations by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that after 6 hours of sintering at 880°C intermetallic compounds: TiCu, TiCu2, TiCu4, Ti2Cu3, Ti3Cu4 were formed. The hardness increased in comparison with a sample made of pure copper whereas density and electrical conductivity decreased. The aim of this work was to fabricate copper matrix composites reinforced with titanium particles containing copper- titanium intermetallic phases using powder metallurgy technology and determine the influence of the titanium particles on the properties of the sintered compacts and, finally, analyse the potentials application for friction materials or electric motors brushes.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 25-30
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibility of Al-Cu composite manufacturing from fine metal fractions by recycling process
    Określenie możliwości wytwarzania kompozytów Al-Cu w procesie recyklingu drobnych frakcji metali
    Autorzy:
    Wzorek, Ł.
    Wędrychowicz, M.
    Wiewióra, M.
    Noga, P.
    Skrzekut, T.
    Wzorek, A.
    Łyp-Wrońska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/263801.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    aluminum
    copper
    powder
    plastic consolidation
    electrical conductivity
    Al-Cu composite
    aluminium
    miedź
    proszek
    konsolidacja plastyczna
    przewodność elektryczna
    kompozyty Al-Cu
    Opis:
    Plastic consolidation of highly fragmented materials is a cost-effective way to recover aluminum alloys. In this process, metal in the form of chips, powders, or ribbons omits the melting step that is typical for conventional scrap recycling; by that, it significantly reduces both energy expenses and material losses. By reducing the number of operations, the cost of labor and expenditures on environmental protection can be decreased. In addition, the solid bonding of metals in highly dispersed forms allows us to create heterogeneous structures that could be difficult to obtain in traditional processes. In the present study, the influence of the addition of Cu powder (99.7 wt.%) on the bonding quality of aluminum powder (99.7 wt.%) during hot extrusion is being examined. The examined materials contained aluminum powder with the addition of 5 wt.% of Cu powder. The mixture of these powders were cold compacted to produce an 80-mm-long charge for the extrusion process. Plastic consolidation was conducted at three different temperatures: 300°, 350°, and 400°C. As a result, rods 8 mm in diameter were obtained. Mechanical tests combined with microstructure observations and electrical conductivity tests were performed for the as-extruded materials.
    Konsolidacja plastyczna silnie rozdrobnionych form materiałów jest ekonomicznie opłacalnym sposobem odzysku stopów aluminium. W procesie tym pomija się etap topienia, który jest integralną częścią recyklingu konwencjonalnego złomów metali takich jak wióry, proszki i taśmy. Umożliwia to znaczącą redukcję nakładów energetycznych oraz strat materiału. W wyniku zmniejszenia liczby operacji, koszty pracy oraz wydatki na ochronę środowiska mogą zostać znacznie zmniejszone. Dodatkowo konsolidacja plastyczna metali w stanie silnie rozproszonym pozwala uzyskać heterogeniczną strukturę, która może być trudna do otrzymania w tradycyjnych procesach. W niniejszej pracy badano jakość połączenia proszku Al z proszkiem Cu podczas wyciskania na gorąco (proszek Al i 5 wag.% proszku Cu). Wstępnie zagęszczony na zimno wsad o długości 80 mm wyciśnięto w trzech temperaturach: 350°C, 400°C, 450°C. W wyniku konsolidacji plastycznej otrzymano pręty o średnicy 8 mm. Dokonano obserwacji ich mikrostruktury, określono własności mechaniczne z próby jednoosiowego rozciągania oraz przeprowadzono pomiar przewodności elektrycznej.
    Źródło:
    Metallurgy and Foundry Engineering; 2017, 43, 2; 117-124
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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