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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Mechanical Properties and Wear Resistance of HVOF Sprayed WC-Co Coatings
    Autorzy:
    Özbek, Y.
    Canikoğlu, N.
    İpek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187418.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Rs
    Opis:
    In this work, the Woka 5810 powders (88% tungsten carbide-12% cobalt) were used to produce coating by high velocity oxy-fuel spraying. WC-Co is widely used as a tribological coating material providing a combination of high toughness, high hardness, and good strength. The treated samples were characterized by using optical micrograph, stereo microscope and scanning electron microscopy, X-ray diffractometry, and microhardness tests. Also the wear performance of the coatings was investigated. The results indicated that the coating shows slight higher microhardness and better abrasive wear resistance than the conventional counterpart. The friction coefficient of coating was low. The scanning electron microscopy and energy dispersive spectroscopy analyses were applied to worn surfaces.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 600-603
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Surface Properties of WC-Co-Cr Based Coatings Deposited by High Velocity Oxygen Fuel Spraying
    Autorzy:
    Ozbek, Y.
    Canikoğlu, N.
    İpek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032535.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Rs
    Opis:
    The aim of this research was to investigate microstructural and mechanical properties of the WC-Co-Cr coatings by high velocity oxygen fuel spraying. Woka 3653 (WC10Co4Cr) powder was used as coating material. This powder is widely used as a tribological coating material providing a combination of high toughness, high hardness, and good strength. The coatings were produced for the different high velocity oxygen fuel spraying parameters. The treated samples were characterized by using scanning electron microscopy/energy dispersive X-ray spectrometry and X-ray diffractometry. Microhardness measurements were executed to evaluate the mechanical properties of the coatings. Also the wear performance of the coatings was investigated. The scanning electron microscopy and energy dispersive X-ray spectrometry analyses were applied to worn surfaces. The results indicated that the coating shows slightly higher microhardness and better abrasive wear resistance than the conventional counterpart.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 186-189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pack Siliconizing of Ti6Al4V Alloy
    Autorzy:
    Celebi Efe, G.
    İpek, M.
    Bindal, C.
    Zeytin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031464.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Lp
    81.65.-b
    Opis:
    In this study, it was aimed to produce titanium silicide layer on Ti6Al4V by a simple, cheap and efficient method of pack siliconizing. Siliconizing was performed in a pack containing a mixture composed of SiO₂ powder as siliconizing source, pure Al powder as a reducer for siliconizing, NH₄Cl as an activator and Al₂O₃ powder as filler, at 1000°C for 8, 10 and 12 hours in open atmospheric furnace. Optical microscope and SEM-EDS studies indicate that the morphology of silicide layers has smooth, dense and layered nature. The presence of phases, confirmed by XRD analyses, reveals that the silicide layers formed at 1000°C are composed of TiSi₂, Ti₃Si₅, TiN, TiO₂ and SiO₂ compounds. Silicide layer thickness was increased with increasing process time and ranged from 7.5 to 9.0 μm. Hardness of silicide layers, measured by Vickers indentation, is over 2100 HV.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 760-762
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of SiC Particle Size on Properties of Cu-SiC Metal Matrix Composites
    Autorzy:
    Celebi Efe, G.
    Altinsoy, I.
    Ipek, M.
    Zeytin, S.
    Bindal, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491445.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.20.Ev
    Opis:
    This paper was focused on the effects of particle size and distribution on some properties of the SiC particle reinforced Cu composites. Copper powder produced by cementation method was reinforced with SiC particles having 1 and 30 μm particle size and sintered at 700°C. Scanning electron microscopy studies showed that SiC particles were dispersed in copper matrix homogeneously. The presence of Cu and SiC components in composites were verified by X-ray diffraction analysis technique. The relative densities of Cu-SiC composites determined by Archimedes' principle are ranged from 96.2% to 90.9% for SiC with 1 μm particle size, 97.0% to 95.0% for SiC with 30 μm particle size. Measured hardness of sintered compacts varied from 130 to 155 HVN for SiC having 1 μm particle size, 188 to 229 HVN for SiC having 30 μm particle size. Maximum electrical conductivity of test materials was obtained as 80.0% IACS (international annealed copper standard) for SiC with 1 μm particle size and 83.0% IACS for SiC with 30 μm particle size.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 251-253
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing of Commercial and Cemented Cu-SiC Composites
    Autorzy:
    Celebi Efe, G.
    Altinsoy, I.
    Yener, T.
    Ipek, M.
    Zeytin, S.
    Bindal, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287723.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.05.Je
    81.05.Ni
    Opis:
    SiC with 30 μm particle size reinforced copper composites have been fabricated by powder metallurgy method and sintered at 700C for 2 h in open atmosphere. Copper powder was produced by cementation method and obtained as commercial for comparing. Cemented and commercial copper powders were reinforced with SiC having 30 μm particle size at ratios of 0, 1, 2, 3, and 5 wt% for improving mechanical properties of copper without decreasing the electrical conductivity. The presence of Cu and SiC which are dominant components in the sintered composites were confirmed by X-ray diffraction analyses technique. Scanning electron microscope showed that SiC particles are distributed homogeneously in the copper matrix. The relative densities of Cu and Cu-SiC composites sintered at 700C are ranged from 98.0% to 96.2% for commercial Cu-SiC composites, 97.55 to 95.0% for cemented Cu-SiC composites, microhardness of composites ranged from 133 to 277 HV for commercial Cu-SiC composites and 127 to 229 HV for cemented Cu-SiC composites, and the electrical conductivity of composites changed between 95.6%IACS and 77.2%IACS for commercial Cu-SiC composites, 91.7%IACS and 69%IACS for cemented Cu-SiC composites. It was observed that there is a good agreement between cemented Cu-SiC and commercial Cu-SiC composites.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 417-419
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Different Heat Exchangers and the Thermal Activities of Different Designs
    Autorzy:
    Ipek, O.
    Kan, M.
    Gurel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031281.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    heat exchangers
    compact heat exchanger
    micro channel heat exchanger
    Opis:
    In this study, instead of gasketed or brazed plate heat exchangers, which are used in various fields of application, a direct metal sintering method is used to design a heat exchanger with its original geometry and with different geometries. Studies of heat exchangers found in published literature were reviewed, and the thermal behaviors of the proposed unique designs were examined. Usually heat exchangers using this design do not use channel spacing angles of 30-45-60-75° for the plate ducts. The thermal behaviors of the fluid-circulating systems were analyzed using ANSYS FLUENT software, and they used the boundary conditions found in the literature for this design. Heat transfer between the heat exchanger channels and channel walls was calculated. The analyses results show that an increase in the amount of heat transfer surface area and also an increase in surface roughness increased the amount of positive heat transfer.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 580-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Pulverised Coal Fired Boiler with Different Burner Geometries
    Autorzy:
    Gurel, B.
    Ipek, O.
    Kan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402493.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    44.15.+a
    Opis:
    Pulverized coal combustion is extensively used in utility boilers, industrial boilers, furnaces, kilns, and other energy conversion appliances. The effective utilization of pulverized coal is the main problem in study of combustion processes, particularly in burning low-grade coal. It is well known that the emission of nitrogen oxides $(NO_{x})$ during coal combustion is a main environmental problem. In this study, three different pulverised coal burner geometries for a pulverised coal fired boiler have been studied by numerical analysis. GLI-Tunçbilek coal was used as fuel. Three-dimensional numerical analysis was carried out using Ansys Fluent code. Realizable K-ε turbulence method, single rate devolatilization method, multiple char combustion method and second-order upwind discretization method were used during calculations. Coal particle diameter and coal mass flow rate were assumed to be 70 μm and 378 kg/h respectively.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-43-B-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Investigation on Hydrodynamic Combustion and NO_x Emission Behavior in 8 MW Circulating Fluidized Bed
    Autorzy:
    İpek, O.
    Gürel, B.
    Kan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031746.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    circulating fluidized bed
    hydrodynamic analysis
    multi-phase flow
    NO_x emissions
    clean coal
    Opis:
    Multi-phase flow is one of the types of flow which is frequently observed in natural phenomena and engineering applications. Circulating fluidized beds constitute an important application of multi-phase flow. The combustion and emission behaviours in circulating fluidized beds are determined by hydrodynamic of bearing. The most appropriate combustion can be provided with the hydrodynamic structure of bearing, taking into account fuel and operating parameters. Therefore, the hydrodynamic structure of circulating fluidized beds should be displayed with mathematical/physical modelling and simulation approach for its analysis and synthesis. Mathematical analysis in today's conditions is very difficult or impossible because of excessive turbulence, unstable and two-phase flow characteristics of the bed. Therefore, the most effective way to do this is the use the physical modelling and simulation approach. In this study, 8 MW circulating fluidized bed hydrodynamic analysis are made by ANSYS-FLUENT R14 commercial CFD code and then combustion and emissions analysis are made with hydrodynamic analysis results. These analysis results show that combustion chamber exit mean NO_x emission was 38.5 ppm and combustion chamber exit mean temperature was 1123 K.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 553-557
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plate Heat Exchangers as a Compact Design and Optimization of Different Channel Angles
    Autorzy:
    Kan, M.
    Ipek, O.
    Gurel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402529.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    44.15.+a
    Opis:
    In this study, thermal treatments have been investigated for different channel angles and mass flow rates of a compact heat exchanger have been manufactured by direct metal laser sintering technique instead of a sealed and brazed one used in many areas. Boundary conditions of available heat exchanger experimental test have been used in laboratory. In this study, we have designed for compact heat exchanger of 30°, 45° and 60° channel angle and used three different mass flow rates (0.2, 0.3, and 0.43 kg/s). Heat transfers occurring between heat channels and walls of heat exchangers for different channel angles and efficiency of heat exchangers have been calculated. As a result of the analysis, it has been determined that in order for maximum of heat transfer of a compact heat exchanger, following working conditions ought to be fulfilled: channel angle 30°, hot water input temperature 60°C, cold water input temperature 15°C, and mass flow rate 0.43 kg/s.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-49-B-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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