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    Wyświetlanie 1-5 z 5
    Tytuł:
    The tribological characteristics of Al-Si/graphite composite
    Charakterystyka tribologiczna kompozytu Al-Si/grafit
    Autorzy:
    Walczak, M.
    Zwierzchowski, M.
    Bieniaś, J.
    Caban, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/190194.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminium matrix composite
    graphite
    sliding friction
    wear testing
    aluminiowe materiały kompozytowe
    grafit
    tarcie ślizgowe
    testy zużycia
    Opis:
    The paper presents the results of tribological research on AlSi12CuNiMg/5.7 wt.% Gr aluminium composite material (containing graphite particles in the amount of 5.7% wt.%) and on its matrix. This composite is used as high-tech construction material in the automotive industry, particularly for pistons, cylinder liners, and slide bearings. The tribological properties of these materials can be significantly changed as a result of the introduction of graphite particles. Therefore, wear tests have been carried out using the ball-on-disc tribometer. Microstructure and wear resistance of the matrix and composite alloy have been subjected to comparative analysis. It was demonstrated that the composite reinforced with graphite is characterized by a lower friction coefficient and lower wear in comparison to the matrix.
    Artykuł przedstawia wyniki badań tribologicznych aluminiowego materiału kompozytowego AlSi12CuNiMg/5.7 wt.% Gr (zawierającego cząsteczki grafitu w ilości 5,7% wag.) i jego osnowy. Kompozyt ten znajduje zastosowanie jako nowoczesny materiał konstrukcyjny w przemyśle motoryzacyjnym, szczególnie na tłoki, tuleje cylindrowe i łożyska ślizgowe. Wprowadzenie cząstek grafitu znacząco może zmieniać właściwości tribologiczne tych materiałów. W tym celu wykonano testy zużycia na tribometrze typu kula-tarcza. Mikrostruktura i odporność na zużycie stopu osnowy i kompozytu zostały poddane analizie porównawczej. Wykazano, że kompozyt zbrojony grafitem charakteryzuje się mniejszym współczynnikiem tarcia i mniejszym zużyciem w porównaniu z osnową.
    Źródło:
    Tribologia; 2017, 271, 1; 97-104
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural, electrical, thermal and tribological studies of copper-fly ash composites through powder metallurgy
    Autorzy:
    Thanga_Kasi_Rajan, S.
    Balaji, A. N.
    Narayanasamy, P.
    Vettivel, S. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/200650.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper composites
    fly ash
    electrical conductivity
    thermal conductivity
    wear test
    popiół lotny
    przewodnictwo elektryczne
    przewodnictwo cieplne
    testy zużycia
    kompozyty miedzi
    Opis:
    This research work address the fabrication of copper (Cu) matrix composites, reinforced with fly ash (FA) particulates with 3, 6, 9 and 12 wt.% using the powder metallurgy route. The microstructural, physical, electrical, thermal, mechanical and tribological properties of thus fabricated Cu-FA composites have been studied. Optical microstructural characterization of the composites exposed persuasively uniform distribution of FA reinforcement with minimum porosity. The mixed powder SEM images revealed the homogeneous dispersion of fly ash particulates in the copper matrix. The hardness values showed improvement with increase in the weight percentage of FA in the Cu matrix. Electrical conductivity was measured using the four-point probe method at room temperature. Thermal conductivity was measured with a thermal diffusivity analyzer at room temperature. The fly ash addition leads to weakening the conductivity of Cu-FA composites. The tribological properties of Cu-FA composite specimens were investigated using a Pin-on-disc tribo testing machine against an EN81 steel contour disc. The specific wear rate of the composites tended first to decrease, which was attributed mainly to the formation of a mechanically mixed layer on the worn surface. Then it would increase as the FA content increased because of reduction in ductility and brittle oxide cracks associated with adding more FA particulates. It seems that composites with FA percentages below 9wt.% have optimum properties of microstructure, hardness and wear resistance, which is suitable for applications such as electrical sliding contacts, electrical discharge machining and spot welding electrodes.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 935-940
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy consumption of a passenger car with a hybrid powertrain in real traffic conditions
    Autorzy:
    Bieniek, Andrzej
    Graba, Mariusz
    Mamala, Jarosław
    Prażnowski, Krzysztof
    Hennek, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/2202524.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    energy consumption
    hybrid vehicle
    road tests
    energy consumption analysis
    zużycie energii
    napęd hybrydowy
    testy drogowe
    analiza zużycia energii
    Opis:
    The analysis of energy consumption in a hybrid drive system of a passenger car in real road conditions is an important factor determining its operational indicators. The article presents energy consumption analysis of a car equipped with an advanced Plug-in Hybrid Electric Drive (PHEV), driving in real road conditions on a test section of about 51 km covered in various environmental conditions and seasons. Particular attention was paid to the energy consumption resulting from the cooperation of two independent drive units, analyzed in terms of the total energy expenditure. The energy consumption obtained from fuel and energy collected from the car’s batteries for each run over the total distance of 12 500 km was summarized. The instantaneous values of energy consumption for the hybrid drive per kilometer of distance traveled in car’s real operating conditions range from 0.6 to 1.4 MJ/km, with lower values relating to the vehicle operation only with electric drive. The upper range applies to the internal combustion engine, which increases not only the energy expenditure in the TTW (Tank-to-Wheel) system, but also CO2 emissions to the environment. Based on the experimental data, the curves of total energy consumption per kilometer of the road section traveled were determined, showing a close correlation with the actual operating conditions. Obtained values were compared with homologation data from the WLTP test of the tested passenger car, where the average value of energy demand is 1.1 MJ/km and the CO2 emission is 23 g/km.
    Źródło:
    Combustion Engines; 2022, 61, 4; 15--22
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Phase Change Materials to Improve the External Walls Thermal Parameters of Heated Buildings
    Autorzy:
    Nakielska, Magdalena
    Kaczmarek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/27314861.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    phase change material
    PCM
    reducing energy consumption
    thermal conductivity coefficient
    laboratory tests
    materiał o przemianie fazowej
    zmniejszenie zużycia energii
    współczynnik przewodności cieplnej
    testy laboratoryjne
    Opis:
    Currently, it is estimated that the construction sector consumes over 40% of the energy produced and about 50% of the mass of processed materials. As a consequence, there is a challenge to look for alternative material solutions allowing for the storage and conversion of energy. Phase change materials give us such opportunities. Their introduction leads to additional benefits related to thermal parameters. The work presents a short overview of PCMs along with the possibility of their application. Then, as part of the research, the selected phase change material was applied to the internal plaster layer of an external wall to check its activity. The obtained results were compared to the values of reference samples (without PCM). The proposed solution leads to the improvement of the analyzed partitions' thermal parameters.
    Źródło:
    Civil and Environmental Engineering Reports; 2023, 33, 4; 63--72
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adhesion of PVD and CVD hard coatings as an essential parameter that determines the durability of coated tools
    Autorzy:
    Pancielejko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379427.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    hard coating
    tool materials
    adhesion
    scratch test
    production tests
    tool lifetime
    wear mechanism
    twarda powłoka
    materiały narzędziowe
    adhezja
    próba zarysowania
    testy produkcyjne
    trwałość narzędzia
    mechanizm zużycia
    Opis:
    Purpose: The work is connected with the current trend related to the modification of tool surfaces with PVD and CVD methods through the deposition of coatings to increase their durability. The research results of coated tools tests that are carried out in industrial conditions are presented in details. Design/methodology/approach: Structure, chemical and phase composition investigations related to the mechanical and tribological properties of coatings produced on tool substrates and analysis of the results are included. Investigations of the properties of deposited coatings on the following tool materials were made: high speed steels, hot work tool steel, sintered carbides and SiAlON tool ceramics. Findings: Interpretation of production tests results of coated tools and an analysis of the wear mechanisms of tool blades in relation to the properties of coatings and their adhesion, in particular characterized in the scratch test, were described. Research limitations/implications: Adhesion scratch test cannot be the only and final method of such evaluation. For example a direct comparison of the results of the scratch tests of coatings is possible when adhesion is being examined of different coatings yet on the same type of the substrate. Practical implications: Based on the adhesion test results using the scratch test, the suitability of the coatings produced on the cutting tools can be quickly assessed. Originality/value: It was sought those parameters which characterize the properties of coatings, ones which would permit to effectively/practically assess the performance of tools with coatings produced, with an exclusion or limitation of long-term and expensive durability tests of tools that are carried out in industrial conditions.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 96, 1; 5-21
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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