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    Wyświetlanie 1-11 z 11
    Tytuł:
    Characterization of Nanometric-Sized Carbides Formed During Tempering of Carbide-Steel Cermets
    Autorzy:
    Matus, K.
    Pawlyta, M.
    Matula, G.
    Gołombek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/356337.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbide-steel cermet
    HRTEM
    STEM
    tempering
    Opis:
    The aim of this article of this paper is to present issues related to characterization of nanometric-sized carbides, nitrides and/or carbonitrides formed during tempering of carbide-steel cermets. Closer examination of those materials is important because of hardness growth of carbide-steel cermet after tempering. The results obtained during research show that the upswing of hardness is significantly higher than for high-speed steels. Another interesting fact is the displacement of secondary hardness effect observed for this material to a higher tempering temperature range. Determined influence of the atmosphere in the sintering process on precipitations formed during tempering of carbide-steel cermets. So far examination of carbidesteel cermet produced by powder injection moulding was carried out mainly in the scanning electron microscope. A proper description of nanosized particles is both important and difficult as achievements of nanoscience and nanotechnology confirm the significant influence of nanocrystalline particles on material properties even if its mass fraction is undetectable by standard methods. The following research studies have been carried out using transmission electron microscopy, mainly selected area electron diffraction and energy dispersive spectroscopy. The obtained results and computer simulations comparison were made.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 747-752
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe-Al based composite reinforced with ultra-fine Al2O3 oxides for high temperature applications
    Autorzy:
    Kopec, Mateusz
    Jóźwiak, Stanisław
    Kowalewski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2055052.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    cermet composites
    reaction synthesis
    powder method
    electron microscopy
    Opis:
    In this paper, an Fe-Al based composite reinforced with ultra-fine Al2O3 oxides was obtained through sintering of aluminium, iron and mullite ceramic powders using self-propagated high temperature synthesis (SHS). The powder mixture with a 50%wt. content of the ceramic reinforcement was cold pressed and subsequently subjected to the sintering process in vacuum at 1200◦C for 25 minutes under external loading of 25 kN. The complex microstructure of the Fe-Al matrix reinforced with ultra-fine Al2O3 oxides was found to be desired in high temperature applications since only 3% of the relative weight gain was observed after 100 hours of annealing at 900◦C.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 509--513
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Cladding of WC/T-800 Cermet: Fabrication, Microstructure and Wear Properties
    Autorzy:
    Kim, Kyoung-Wook
    Kim, Young-Kyun
    Park, Sun-Hong
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2049250.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CoMoCr alloy
    WC
    cermet
    laser cladding
    microstructure
    wear properties
    Opis:
    This study fabricated a WC/T-800 cermet coating layer with Co-Mo-Cr (T-800) powder and WC powder using laser cladding, and analyzed its microstructure, hardness and wear properties. For comparison, casted bulk T-800 was used. Laser cladded WC/T-800 cermet coating layer showed circular WC phases in the Co matrix, and dendritic laves phases. The average laves phase size in the cermet coating layer and bulk T-800 measured as 7.9 µm and 60.6 µm, respectively, indicating that the cermet coating layer had a relatively finer laves phase. Upon conducting a wear test, the cermet coating layer added with WC showed better wear resistance. In the case of laser cladded WC/T-800 cermet coating layer, abrasion wear was observed; on the contrary, the bulk T-800 showed pulled out laves phases. Based on the above findings, the WC/T-800 cermet coating layer using laser cladding and the relationship between its microstructure and wear behavior were discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 713-717
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Velocity Impact of 2-Phase WC/Co Composite Plate - Beginning of the Process
    Autorzy:
    Postek, E.
    Sadowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351505.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    2-phase composites
    cermet
    Johnson-Cook plasticity
    impact
    numerical modelling
    Opis:
    2-phase composites are often used for high demanding parts that can undergo impact loads. However, most of the papers on dynamic loading concerns layered composites. In our opinion, the impact loads are not considered thoroughly enough. Good examples of 2-phase composites are: (1) a WC/Co cermet or (2) a monolithic ceramic Al2 O3 /ZrO2 . The WC/Co cermet is often modelled as having ductile elasto-plastic Co matrix and ideally elastic WC grains. It is because of very high crushing resistivity of the WC. In this paper, we present an extension to earlier elaborated models ([44]) with the assumption of ideal elasticity of the grains. The new and general numerical model for high-velocity impact of the 2-phase composites is proposed. The idea of this novelty relies on the introduction of crushability of grains in the composite and thermo-mechanical coupling. The model allows for description of the dynamic response both composite polycrystals made of: (1) 2 different purely elastic phases (e.g. Al2 O3 /ZrO2 ) or (2) one elastic phase and the second one plastic (e.g. cermet WC/Co), or (3) 2 elasto-plastic phases with different material properties and damage processes. In particular, the analysis was limited to the cases (2) and (3), i.e. we investigated the WC/Co polycrystal that impacted a rigid wall with the initial velocity equal to 50 m/s.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 265-274
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Properties of TiC/Ti Coatings Deposited by the Supersonic Cold Gas Spray Technique
    Autorzy:
    Kusiński, J.
    Kac, S.
    Kowalski, K.
    Dosta, S.
    Georgiou, E. P.
    Garcia-Forgas, J.
    Matteazzi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356608.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold gas spraying
    Ti
    TiC
    CerMet coating
    SEM
    TEM
    wear resistance
    Opis:
    Nanostructured, biocompatible, TiC/Ti Supersonic Cold Gas Sprayed coatings were deposited onto a Ti6Al4V alloy and their microstructure, wear resistance and hardness were investigated. The starting nanostructured powder, containing a varied mixture of Ti and TiC particles, was produced by high energy ball milling. Scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were used for structural and chemical analyses of powder particles and coatings. Coatings, 250-350 μm thick, preserving the nanostructure and chemical powder composition, with low porosity and relatively high hardness (~850 HV), were obtained. These nanostructured TiC/Ti coatings exhibited better tribological properties than commonly used biomedical benchmark materials, due to an appropriate balance of hard and soft nano-phases.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 867-873
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reprocessability of molybdenum and magnesia based inert matrix fuels
    Autorzy:
    Ebert, E. L.
    Bukaemskiy, A.
    Sadowski, F.
    Lange, S
    Wilden, A.
    Modolo, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148138.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    CERCER
    CERMET
    dissolution
    inert matrix fuels (IMF)
    liquid-liquid extraction
    minor actinides
    reprocessing
    Opis:
    This work focuses on the reprocessability of metallic 92Mo and ceramic MgO, which is under investigation for (Pu,MA)-oxide (MA = minor actinide) fuel within a metallic 92Mo matrix (CERMET) and a ceramic MgO matrix (CERCER). Magnesium oxide and molybdenum reference samples have been fabricated by powder metallurgy. The dissolution of the matrices was studied as a function of HNO3 concentration (1–7 mol/L) and temperature (25–90°C). The rate of dissolution of magnesium oxide and metallic molybdenum increased with temperature. While the MgO rate was independent of the acid concentration (1–7 mol/L), the rate of dissolution of Mo increased with acid concentration. However, the dissolution of Mo at high temperatures and nitric acid concentrations was accompanied by precipitation of MoO3. The extraction of uranium, americium, and europium in the presence of macro amounts of Mo and Mg was studied by three different extraction agents: tri-n-butylphosphate (TBP), N,N'-dimethyl-N,N'-dioctylhexylethoxymalonamide (DMDOHEMA), and N,N,N’,N’- -tetraoctyldiglycolamide (TODGA). With TBP no extraction of Mo and Mg occurred. Both matrix materials are partly extracted by DMDOHEMA. Magnesium is not extracted by TODGA (D < 0.1), but a weak extraction of Mo is observed at low Mo concentration.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 2; 871-878
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of TiC-Mo2C-WC-Ni Cermets by a High-Energy Ball Milling/Spark Plasma Sintering
    Autorzy:
    Lee, Jeong-Han
    Park, Jae-Cheol
    Park, Hyun-Kuk
    Powiązania:
    https://bibliotekanauki.pl/articles/2203731.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TiC-based cermet
    core-rim structure
    high-energy ball-milling
    spark plasma sintering
    microstructure
    Opis:
    A TiC-Mo2C-WC-Ni alloy cermet was fabricated by high-energy ball milling (HEBM) and consolidation through spark plasma sintering. The TiC-based powders were synthesized with different milling times (6, 12, 24, and 48 h) and subsequently consolidated by rapid sintering at 1300°C and a load of 60 MPa. An increase in the HEBM time led to improved sinterability as there was a sufficient driving force between the particles during densification. Core-rim structures such as (Ti, W)C and (Ti, Mo)C (rim) were formed by Ostwald ripening while inhibiting the coarsening of the TiC (core) grains. The TiC grains became refined (2.57 to 0.47 µm), with evenly distributed rims. This led to improved fracture toughness (11.1 to 14.8 MPa·m1/2) owing to crack deflection, and the crack propagation resistance was enhanced by mitigating intergranular fractures around the TiC core.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 127--130
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates
    Autorzy:
    Jonda, Ewa
    Łatka, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/2024046.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mechanical properties
    microstructure
    fracture toughness
    indentation test
    cermet coating
    HVOF spraying
    magnesium alloy AZ31
    Opis:
    Magnesium alloys are very interesting engineering materials due to their very high strength to density ratio (the best among metallic alloys). However, because of low hardness as well as low resistance against erosion, abrasion and corrosion, their applications in the industry is very limited. In order to improve mechanical performances, deposition of hardening coating by thermal spraying was proposed. In this work, the WC-based coatings with different binder (Co or Ni) and co-hardening additives (Cr or Cr3C2) manufactured by high velocity oxy-fuel (HVOF) were studied. These coatings were deposited onto AZ31 magnesium alloy. The crucial problem is obtaining good-adhered coating without damage the substrate, because of relatively low temperature resistance of magnesium alloys (about 300 °C). To solve this problem, HVOF method, which is low temperature and high velocity, was proposed. Also an important role plays process parameters (e.g. spray distance, fuel medium, type of nozzle). The goal of the study was to compare three types of cermet coatings manufactured from commercially available powders (WC-Co, WC-Co-Cr and WC-Cr3C2-Ni) in terms of their microstructure features, microhardness, instrumented indentation and fracture toughness. Results revealed that selected process parameters made it possible to obtain well-adhered coating with good fulfillment of the surface unevenness of the AZ31 substrate. The most noticeable effect was influence of cobalt matrix on higher hardness (1.4 – 1.6 GPa) and Young modulus (330 – 340 GPa) of deposited coatings in compare to the nickel matrix ones (1.2 GPa and 305 GPa, respectively). The same trend was observed in case of fracture toughness, c.a. 6.5 MPa·m1/2 for Co-matrix and 4.9 MPa·m1/2 for Ni-matrix
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 2; 57-64
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natryskiwane zimnym gazem powłoki odporne na ścieranie
    Wear resistant coatings deposited by cold gas spraying
    Autorzy:
    Kusiński, J.
    Kąc, S.
    Kowalski, K.
    Matteazzi, P.
    Dosta, S.
    Georgiou, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/195791.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    mechaniczna synteza
    powłoki metal/ceramika
    mikrostruktura
    twardość
    testy tribologiczne
    high energy ball milling
    cermet coatings
    microstructure
    hardness
    tribological tests
    Opis:
    Naukowym i technologicznym celem badań było wytworzenie nanostrukturalnych powłok FeCuAl-Al2O3, WC-CoAl, Ni-Sn, TiC/Ti o grubości od 45 do 500 μm. Nanoproszki charakteryzujące się strukturą krystaliczną i równomiernym rozmieszczeniem składników otrzymywano, stosując wysokoenergetyczną syntezę mechaniczną. Proszek o strukturze nanokrystalicznej był nanoszony na podłoże bez istotnych zmian jego struktury i właściwości, z wykorzystaniem nowej technologii (natryskiwania zimnym gazem – CGS), pozwalającej uzyskiwać powłoki o dużej gęstości. Mikrostrukturę oraz skład chemiczny nanoproszków i nanoszonych powłok analizowano, wykorzystując mikroskopię świetlną, TEM, STEM, SEM/EDS, XPS oraz XRD. Ponadto mierzono współczynnik tarcia oraz odporność na ścieranie powłok. Przeprowadzone badania wykazały, że mikrostruktura powłok odpowiada strukturze nanoszonych proszków. Dzięki nanostrukturalnej budowie powłok, właściwej proporcji faz twardych i miękkich, natryskiwane zimnym gazem powłoki wykazują lepsze właściwości trybologiczne w porównaniu z materiałami standardowo stosowanymi w przemyśle i bioinżynierii.
    The basic scientific and technological aim of the research was the generation of nano-structured FeCuAl-Al2O3, WC-CoAl, Ni-Sn, TiC/Ti coatings having thicknesses of about 100-500 μm. High energy ball milling synthesis allowed the production of powders characterized by fine and homogeneous chemical distribution of elements, and an "ultrafine" (nanometer scale) crystalline structure. A new powerful deposition technology (Cold Gas Spray – CGS) was used to transfer the nanophased powder onto the substrate in the form of a dense coating with very little or no change of crystal structure and properties. The microstructure and composition of all prepared nano-powders and deposited coatings were investigated using light microscopy, TEM, STEM, SEM/EDS, XPS and XRD techniques. Hardness, and measurement of the coefficient of friction and wear resistance were carried out on the deposited coatings. It was found that the microstructure of the powder is maintained in the deposited coating. The nano phased structure, with an appropriate balance of hard and soft phases, allows the CGS coatings to exhibit better tribological properties than that of the examined benchmark materials.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 2; 175-186
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric optimisation of microhardness on heat-treated electroless Ni-YSZ cermet coating
    Autorzy:
    Bahiyah Baba, N.
    Ghazali, A. S.
    Abdul Rahman, A. H.
    Sharif, S
    Powiązania:
    https://bibliotekanauki.pl/articles/2172165.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    full factorial
    electroless
    Ni-YSZ
    cermet
    coating
    microhardness
    treating temperature
    treating time
    silnia
    bezprądowy
    powłoka
    mikrotwardość
    temperatura obróbki
    czas obróbki
    Opis:
    Purpose The paper discusses the parametric optimisation of the electroless Ni-YSZ cermet coating microhardness upon heat treatment. Heat treatment is a process to increase the mechanical properties of the electroless nickel coating and it can be enhanced by manipulating its parameters. Parametric optimisation is conducted by the design of experiment full factorial 3x3 with 27 runs. Treating temperature, treating time and ceramic particle size parameters at 3-level are evaluated using statistical tool ANOVA in Minitab20. Design/methodology/approach Ni-YSZ cermet coating is deposited onto a high-speed steel substrate using the electroless nickel co-deposition method. The temperature and time were varied in a range of 300-400oC and 0-2 hours respectively. The microhardness measurements were carried out using a Vickers microhardness tester (Shimadzu) according to ISO 6507-4. The surface characterisation was analysed using Cambridge Stereoscan 90 Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray Analysis (EDXA). Findings The optimum condition in obtaining high microhardness on Ni-YSZ cermet coating is evaluated by statistical tool ANOVA in Minitab20 software. It is found that the most significant parameter for high microhardness is at the treating temperature of 400oC followed by treating time at 2 hours using nano-sized YSZ particles. The ceramic particle size is found not a significant parameter in obtaining a high microhardness, however it has effect on interaction between treating temperature and treating time. Research limitations/implications The paper only limits to the optimisation condition of microhardness on Ni-YSZ cermet coating hardness property by varying heat treatment parameters. Practical implications The optimisation condition obtained might only applicable to the electroless Ni-YSZ cermet coating with similar electroless nickel solution and treatments. Originality/value The value of this work is the heat treatment parametric optimisation to obtain high microhardness on electroless Ni-YSZ cermet coating by using the design of experiment 3-level full factorial.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 33--41
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat treatment on microhardness of electroless Ni-YSZ cermet coating
    Autorzy:
    Bahiyah Baba, N.
    Ghazali, A. S.
    Abdul Rahman, A. H.
    Sharif, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201036.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    Ni-YSZ
    cermet
    coating
    microhardness
    heating temperature
    heating time
    electroless nickel
    powłoka
    mikrotwardość
    temperatura nagrzewania
    czas nagrzewania
    bezprądowe powlekanie niklem
    Opis:
    Purpose: The paper discussed the effect of heat treatment on electroless nickel-yttria-stabilised zirconia (Ni-YSZ) cermet coating. Ni-YSZ cermet coating has potential applications such as cutting tools, thermal barriers, solid oxide fuel anode, and various others. The compatibility of ceramic YSZ and metallic nickel in terms of the mechanical properties such as hardness by varying the heating temperature, time and ceramic particle size is highlighted. Design/methodology/approach: Ni-YSZ cermet coating was deposited onto a highspeed steel substrate using the electroless nickel co-deposition method. The temperature and time were varied in a range of 300-400°C and 1-2 hours, respectively. The microhardness measurements were carried out using a Vickers microhardness tester (Shimadzu) according to ISO 6507-4. The surface characterisation of the cermet coating was carried out using JOEL Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDX) JSM 7800F. The crystallographic structure of materials was analysed by X-ray diffraction (XRD) Bruker D8 Advance instrument. Findings: It was found that the microhardness of Ni-YSZ cermet coating with the ratio of 70:30, respectively, is directly proportional to the heating temperature and time. Heating the Ni-YSZ cermet coating at 300°C from room temperature (rtp) to 1 hour shows a 12% microhardness increment, while from 1 to 2 hours gives a 19% increment. Compared to heating at 350°C and 400°C, the increment is more significant at 33% and 49% for rtp to 1 hour and 8% and 16% for 1 to 2 hours, respectively. In addition, the effect of varying YSZ particle size in the Ni-YSZ cermet gave response differently for heating temperature and heating time. Research limitations/implications: The paper is only limited to the discussion of the heat treatment effect on Ni-YSZ cermet coating hardness property. The tribological effect will be in future work. Practical implications: The microhardness data may vary due to the Vickers microhardness force applied and the amount of ceramic particle incorporation and phosphorus content in the nickel matrix. Originality/value: The value of this work is the compatibility of the ceramic YSZ and metallic nickel matrix in terms of mechanical properties, such as hardness, upon heat treatment.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 5--12
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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