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    Tytuł:
    The deposition of WC-Co coatings by EBPVD technique
    Osadzanie powłok WC-Co technikami EBPVD
    Autorzy:
    Richert, M. W.
    Mazurkiewicz, A.
    Smolik, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355001.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    węgliki WC-Co
    powłoki nanostrukturalne
    EB-PVD
    electron beam evaporation
    WC-Co coatings
    microstructure
    Opis:
    The WC-Co carbides are widely used to deposit protective coatings on engineering surfaces against abrasion, erosion and other forms of wear existence. The nanostructure coatings offer high strength, a low friction coefficient and chemical and thermal stability. WCo coatings were deposited using EBPVD technique realized in original technological process implemented in the hybrid multisource device, produced in the Institute for Sustainable Technologies - National Research Institute in Radom (Poland). The different kind of precursor sources was used. Depending on the source of precursors nanostructure of coatings forms continuous film or consist from nano-carbides. Nanocrystalline WC-Co coatings show hardness in the range of 510-1266 HV. The microstructure of coatings were observed by transmission electron microscopy (TEM). The phase consistence were determined byBrucker D8 Discover-Advance Diffractometer. The paper presents the original technological equipment, methodology, and technological parameters for the creation of the nanocomposite coatings WC.
    Węgliki WC-Co są szeroko używane do osadzania na powierzchniach inżynierskich jako ochrona przeciwko tarciu, erozji i innym formom zużycia. Powłoki nanostrukturalne wykazują wysoka wytrzymałość, niski współczynnik tarcia oraz chemiczną i termiczną stabiność. Powłoki WC-Co zostały osadzane techniką EBPVD przy użyciu oryginalnego technologicznego procesu z hybrydowym źródłem prekursorów, w Instytucie Technologii Eksploatacji w Radomiu (Polska). Użyto różnego rodzaju źródeł prekursorów. W zależności od rodzaju użytego źródła prekursorów nanostrukturalne powłoki były zbudowane z ciągłych warstw lub z nano-weglików. Mikrotwardość nanokrystalicznych powłok mieściła się w zakresie 510-1266 μHV. Mikrostruktura powłok była obserwowana transmisyjnym mikroskopem elektronowym (TEM). Skład fazowy powłok określono za pomocą aparatu rentgenowskiego Brucker D8 Discover-Advance Diffractometer. Artykuł prezentuje oryginalne technologiczne urządzenie, metodologię i technologiczne parametry pozwalające na wytworzenie nanokompozytowej powłoki WC.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 2; 511-515
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders
    Autorzy:
    Żórawski, W.
    Makrenek, M.
    Góral, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355159.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC-12Co
    HVOF
    mechanical properties
    Opis:
    Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1839-1846
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infiltration Behavior Of Mechanical Alloyed 75 wt% Cu-25 wt% WC Powders Into Porous WC Compacts
    Proces infiltracji porowatych kształtek WC z wykorzystaniem proszku 75% Cu-25 WC wytworzonego metodą mechanicznego stopowania
    Autorzy:
    Şelte, A.
    Özkal, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/353036.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical contacts
    WC-Cu system
    mechanical alloying
    contact infiltration
    styki elektryczne
    powłoka WC-Cu
    stopowanie mechaniczne
    infiltracja
    Opis:
    In this work infiltration behavior of mechanical alloyed 75 wt% Cu – 25 wt% WC powders into porous WC compacts were studied. Owing to their ductile nature, initial Cu powders were directly added to mechanical alloying batch. On the other hand initial WC powders were high energy milled prior to mechanical alloying. Contact infiltration method was selected for densification and compacts prepared from processed powders were infiltrated into porous WC bodies. After infiltration, samples were characterized via X-Ray diffraction studies and microstructural evaluation of the samples was carried out via scanning electron microscopy observations. Based on the lack of solubility between WC and Cu it was possible to keep fine WC particles in Cu melt since solution reprecipitation controlled densification is hindered. Also microstructural characterizations via scanning electron microscopy confirmed that the transport of fine WC fraction from infiltrant to porous WC skeleton can be carried out via Cu melt flow during infiltration.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1565-1568
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure And Properties Of WC-Co HVAF Coatings Obtained From Standard, Superfine And Modified By Sub-Micrometric Carbide Powders
    Mikrostruktura i właściwości powłok WC-Co natryskiwanych metodą HVAF, otrzymywanych z proszków standardowych, drobnoziarnistych oraz modyfikowanych submikrometrycznymi proszkami węglików
    Autorzy:
    Myalska, H.
    Szymański, K.
    Moskal, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/353933.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear resistant coatings
    WC-Co carbide
    sub-micrometric carbide
    HVAF
    powłoki odporne na zużycie
    węgliki WC-Co
    węgliki submikrometryczne
    Opis:
    In this paper, microstructure and some properties of various coatings based on WC-Co obtained by the High Velocity Air Fuel technique are discussed. Initially, two WC-Co 83-17 powders of standard and superfine size were examined as a feedstock for a coatings deposition on a steel substrate. A standard Amperit 526.074 powder and an Inframat superfine powder were applied. Then three different sub-micrometric powders, WC, Cr3C2 and TiC were applied to modify the microstructure of WC-Co (Amperit 526.074). The aim of the investigations was to compare the microstructure and basic properties of coatings deposited from different components. The influence of sub-micrometric additions on mechanical properties of basic coatings was analyzed. Microstructure characterization of powders by using SEM and characterization of their technological properties as well, are presented. For all manufactured coatings obtained by a High Velocity Air Fuel method, the microhardness, porosity, adhesion to a substrate, and fracture toughness were determined. An improvement in WC-Co coating properties, as a result of sub-micrometric carbides addition, was revealed.
    W pracy zostały omówione niektóre właściwości oraz mikrostruktura powłok typu WC-Co otrzymywanych metodą naddźwiękowego natrysku cieplnego w atmosferze powietrza (High Velocity Air Fuel). Początkowo, analizowano dwa proszki typu WC-Co 83-17 o standardowym rozmiarze ziarna oraz drobnym ziarnie pod kątem osadzania powłok na podłożu stalowym. Zastosowano standardowy proszek Amperit 526.074 oraz proszek drobnoziarnisty Inframat. Następnie trzy proszki submikrokrometryczne WC, Cr3C2 oraz TiC zastosowano w celu zmodyfikowania mikrostruktury proszku WC-Co (Amperit 526.074). Celem badań było porównanie mikrostruktury i różnych właściwości powłok natryskiwanych cieplnie z różnych proszków. Analizowano wpływ dodatków submikrometrycznych na właściwości mechaniczne powłok podstawowych. Scharakteryzowano morfologię proszków przy użyciu mikroskopu skaningowego oraz scharakteryzowano ich właściwości technologiczne. Dla wszystkich wytworzonych powłok uzyskanych za pomocą metody natrysku naddźwiękowego określono mikrotwardość, porowatość, przyczepność do podłoża i odporności na kruche pękanie. Ujawniono poprawę właściwości powłok WC-Co w wyniku wprowadzenia dodatków węglików submikrometrycznych.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 759-766
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Effect of Wetting Agent and Carbide Volume Fraction on the Wear Response of Aluminum Matrix Composites Reinforced by WC Nanoparticles and Aluminide Particles
    Autorzy:
    Lekatou, A.
    Gkikas, N.
    Karantzalis, A. E.
    Kaptay, G.
    Gacsi, Z.
    Baumli, P.
    Simon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353829.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-WC
    nanocomposites
    aluminides
    wetting agent
    ball-on-disk
    Opis:
    Aluminum matrix composites were prepared by adding submicron sized WC particles into a melt of Al 1050 under mechanical stirring, with the scope to determine: (a) the most appropriate salt flux amongst KBF4 , K2 TiF6 , K3 AlF6 and Na3 AlF6 for optimum particle wetting and distribution and (b) the maximum carbide volume fraction (CVF) for optimum response to sliding wear. The nature of the wetting agent notably affected particle incorporation, with K2 TiF6 providing the greatest particle insertion. A uniform aluminide (in-situ) and WC (ex-situ) particle distribution was attained. Two different sliding wear mechanisms were identified for low CVFs (≤1.5%), and high CVFs (2.0%), depending on the extent of particle agglomeration.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1235-1242
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Analysis of Nitrogen as an Alloying Element in WC9 Grade Steel
    Autorzy:
    Vishnuh, V.
    Sudhakar, S.
    Tamilarasu, K.
    Prabhakaran, P.
    Rajasekar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/352617.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nitrogen alloying
    WC9 steel
    solution annealing
    mechanical properties
    Opis:
    In the present work the effect of nitrogen on WC9 alloy at various weight percentages was analyzed and tested for their microstructural and mechanical properties. The nitrogen was added at 0.05, 0.10, 0.15, 0.20 and 0.25 wt. % in the solid form as nitrided ferrochrome to WC9 alloy. The samples were heat treated by solution annealing process at a temperature of 1100°C for 5 hours to improve the austenitic formation. Microstructures and mechanical properties such as tensile strength, yield strength, hardness, % elongation and % reduction of WC9-N alloy were examined. It was observed that increasing nitrogen wt. % increases the mechanical properties. The obtained mechanical properties were compared with base WC9 and C12A grade steel, where it was found to be replacement for C12A grade steel at its composition at lower end. The material cost analysis for WC9-N and C12A grade steel was done and both were compared.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1889-1894
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Fretting Fatigue of Tungsten Carbide Coating Based on Strain Energy Density Methods
    Autorzy:
    Zeng, Xin
    Wang, Xiaoxiao
    Ping, Xuecheng
    Wang, Renjie
    Hu, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2203727.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC coating
    crack initiation
    cracking angle
    critical plane
    life prediction
    Opis:
    The numerical solutions of stress and strain components on the critical plane of tungsten carbide coating were solved based on the critical plane method in three-dimensional coordinate system, and accordingly three strain energy density parameters (Smith-Watson-Topper, Nita-Ogatta-Kuwabara and Chen parameters) were determined to reveal the fretting fatigue characteristics of tungsten carbide coating. In order to predict the fretting fatigue life based on the strain energy density criterion, the expressions between the strain energy density parameter and the fretting fatigue life was obtained experimentally. After the comparison of the three strain energy parameters, it was found that all three parameters could accurately predict the crack initiation position, but only the Smith-Watson-Topper parameters could accurately predict the crack initiation angle. The effects of cyclic load, normal load and friction coefficient on fretting fatigue damage behaviors were discussed by using the Smith-Watson-Topper criterion. The results show that the fretting fatigue life decreases with the increase of cyclic load; an increase in the normal contact load will cause the Smith-Watson-Topper damage parameters more concentrated at the outer edge of the bridge foot; a decrease in the friction coefficient will increase the Smith-Watson-Topper damage parameters in the middle of the contact surface.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 21--30
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure And Mechanical Properties Of Al-WC Composites
    Mikrostruktura i właściwości mechaniczne kompozytów Al-WC
    Autorzy:
    Simon, A.
    Lipusz, D.
    Baumli, P.
    Balint, P.
    Kaptay, G.
    Gergely, G.
    Sfikas, S.
    Lekatou, A.
    Karantzalis, A.
    Gacsi, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/352222.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    aluminium
    WC
    microstructure
    mechanical properties
    kompozyt
    mikrostruktura
    właściwości mechaniczne
    Opis:
    The scope of the research work is the production and characterization of Al matrix composites reinforced with WC ceramic nanoparticles. The synthesis process was powder metallurgy. The produced composites were examined as far as their microstructure and mechanical properties (resistance to wear, micro/macrohardness). Intermetallic phases (Al12W and Al2Cu) were identified in the microstrucutre. Al4C3 was not detected in the composites. Adding more than 5 wt% WC to the aluminum, microhardness and wear resistance exceed the values of Al alloy. Composites having weak interface bond performed the highest wear rate.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1517-1521
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    WC-5Co Cemented Carbides Fabricated by SPS
    Autorzy:
    Siwak, P.
    Grabiec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352835.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spark plasma sintering
    cemented carbides
    WC-5Co
    hardness
    fracture toughness
    Opis:
    New graphite tools were designed and produced to fabricate a semi-finished product from which nine cutting inserts were obtained in one spark plasma sintering process. As a result, WC-5Co cemented carbides were spark plasma sintered and the effect of various sintering parameters such as compacting pressure, heating rate and holding time on the main mechanical properties were investigated. It was shown that WC-5Co cemented carbides spark plasma sintered at 1200°C, 80 MPa, 400°C/min, for 5 min are characterized by the best relation of hardness (1861±10 HV30 ) and fracture toughness (9.30 MPa·m1/2). The microstructure of these materials besides the WC ceramic phase and Co binder phase consists of a synthesized Co3 W3 C complex phase. Comparison with a commercial WC-6Co cutting insert fabricated by conventional powder metallurgy techniques shows that spark plasma sintering is a very effective technique to produce materials characterized by improved mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 2031-2037
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consolidation and Oxidation of Ultra Fine WC-Co-HfB2 Hard Materials by Spark Plasma Sintering
    Autorzy:
    Park, Hyun-Kuk
    Oh, Ik-Hyun
    Kim, Ju-Hun
    Hong, Sung-Kil
    Lee, Jeong-Han
    Powiązania:
    https://bibliotekanauki.pl/articles/2049178.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    hafnium diboride
    spark plasma sintering
    oxidation
    mechanical property
    Opis:
    In this study, a novel composite was fabricated by adding the Hafnium diboride (HfB2) to conventional WC-Co cemented carbides to enhance the high-temperature properties while retaining the intrinsic high hardness. Using spark plasma sintering, high density (up to 99.4%) WC-6Co-(1, 2.5, 4, and 5.5 wt. %) HfB2 composites were consolidated at 1300°C (100°C/min) under 60 MPa pressure. The microstructural evolution, oxidation layer, and phase constitution of WC-Co-HfB2 were investigated in the distribution of WC grain and solid solution phases by X-ray diffraction and FE-SEM. The WC-Co-HfB2 composite exhibited improved mechanical properties (approximately 2,180.7 kg/mm2) than those of conventional WC-Co cemented carbides. The high strength of the fabricated composites was caused by the fine-grade HfB2 precipitate and the solid solution, which enabled the tailoring of mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 997-1000
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of High Frequency Heat Treatment on the Microstructure and Macroscopic Properties of WC-50Ni+Stellite 1 Coating Layer Fabricated by HVOF Spray Process
    Autorzy:
    Ham, Gi-Su
    Wi, Dong-Yeol
    Park, Sun-Hong
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/354654.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HVOF spray
    WC-50Ni
    Stellite 1
    composite coating
    high frequency heat treatment
    Opis:
    The microstructure and macroscopic properties of WC-50Ni+stellite 1(Co-Cr-W, ST1) coating layer fabricated by HVOF spray have been investigated. WC-50Ni powder and ST1 powders were mixed in the ratio of 1:0 and 5:5 wt.%, respectively. Argon heat treatment (Ar) and high-frequency heat treatment (H.F.) were conducted on the coating materials. WC was decomposed in the Ar heat treatment specimen, but decomposition of WC was not observed in the H.F. heat treatment specimen. Hardness was measured for as-sprayed WC-50Ni (821.5Hv) and as-sprayed WC-50Ni+ST1 (668.1 Hv). Hardness of Ar heat treatment specimen was reduced by about 14~18% than that of the as-sprayed coating layers. However, when the H.F. heat treatment was performed, the hardness inversely increased by about 6~10% than the as-sprayed coating layer. Based on these results, the method to improve the mechanical property of HVOF sprayed WC-50Ni+ST1 coating layer has also been also discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1087-1092
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Transition Metal Carbides on Microstructure and Mechanical Properties of Ultrafine Tungsten Carbide Via Spark Plasma Sintering
    Autorzy:
    Lee, Jeong-Han
    Oh, Ik-Hyun
    Park, Hyun-Kuk
    Powiązania:
    https://bibliotekanauki.pl/articles/2048887.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    transition metal carbide
    spark plasma sintering
    grain growth inhibitor
    hardness
    Opis:
    WC-Co cemented carbides were consolidated using spark plasma sintering in the temperature 1400°C with transition metal carbides addition. The densification depended on exponentially as a function of sintering exponent. Moreover, the secondary (M, W)Cx phases were formed at the grain boundaries of WC basal facet. Corresponded, to increase the basal facets lead to the plastic deformation and oriented grain growth. A higher hardness was correlated with their grain size and lattice strain. We suggest that this is due to the formation energy of (M, W)Cx attributed to inhibit the grain growth and separates the WC/Co interface.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1029-1032
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Purity Tungsten Spherical Particle Preparation From WC-Co Spent Hard Scrap
    Wytwarzanie wysokiej czystości sferycznych cząstek wolframu z twardego złomu WC-Co
    Autorzy:
    Han, C.
    Na, H.
    Choi, H.
    Kim, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/351951.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC-Co
    spent hard scrap
    hydrometallurgy
    RF thermal plasma
    twardy złom
    hydrometalurgia
    plazma termiczna
    Opis:
    Tungsten carbide-cobalt hard metal scrap was recycled to obtain high purity spherical tungsten powder by a combined hydrometallurgy and physical metallurgy pathway. Selective leaching of tungsten element from hard metal scrap occurs at solid / liquid interface and therefore enlargement of effective surface area is advantageous. Linear oxidation behavior of Tungsten carbide-cobalt and the oxidized scrap is friable to be pulverized by milling process. In this regard, isothermally oxidized Tungsten carbide-cobalt hard metal scrap was mechanically broken into particles and then tungsten trioxide particle was recovered by hydrometallurgical method. Recovered tungsten trioxide was reduced to tungsten particle in a hydrogen environment. After that, tungsten particle was melted and solidified to make a spherical one by RF (Ratio Frequency) thermal plasma process. Well spherical tungsten micro-particle was successfully obtained from spent scrap. In addition to the morphological change, thermal plasma process showed an advantage for the purification of feedstock particle.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1507-1509
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase reactions during sintering of M3/2 based composites with WC additions
    Analiza spiekania kompozytów stal szybkotnąca M3/2 - węglik wolframu WC
    Autorzy:
    Madej, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355836.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    M3/2 High speed steel (HSS)
    tungsten carbide WC
    copper
    metal matrix composites (MMC)
    sintering
    infiltration
    stal szybkotnąca M3/2
    węglik wolframu WC
    miedź
    kompozyty z osnową metaliczną (MMC)
    spiekanie
    infiltracja
    Opis:
    Attempts have been made to describe the influence of WC additions on properties of M3/2 high speed steel (HSS) based composites. The powder compositions used to produce skeletons for further infiltration were M3/2, M3/2+10%WC and M3/2+30%WC. The powders were cold pressed at 800 MPa. The green compacts were subsequently sintered for 60 minutes at 1150°C in vacuum. These as-sintered specimens were used for copper infiltration. A qualitative EDX analysis revealed presence of both MC type vanadium-rich carbides and M6 C type tungsten and iron rich carbides. In specimens containing 10 and 30% WC the carbide phase was uniformly distributed within copper-rich regions. The WC monocarbide reacts with the surrounding HSS matrix and forms a carbide grain boundary film. The microstructural observations of the as-sintered specimens was followed by Brinell hardness test and supplemented with dilatometric studies.
    Badania miały na celu określenie wpływu dodatku węglika wolframu WC na własności kompozytów na osnowie stali szybkotnącej. Do wytwarzania porowatych kształtek stosowano następujace mieszanki proszków: 100% M3/2, M3/2+10%WC i M3/2+30%WC. Mieszanki proszków prasowano pod ciśnieniem 800MPa. Część wyprasek poddano spiekaniu przez 60 minut w temperaturze 1150°C w próżni lepszej od 10-2. Do infiltracji stosowano wypraski i porowate spieki. Analiza przy użyciu mikrosondy rentgenowskiej potwierdziła obecność dwu typów węglików: MC bogatych w wanad oraz M6 C bogatych w wolfram i żelazo. W kształtkach z dodatkiem 10 i 30% węglika wolframu następuje rozpuszczanie węglika i rekcja z osnową stali szybkotnącej, w wyniku czego powstaje nowy węglik w postaci filmu otaczającego cząstki dodanego węglika wolframu. Dodatkowo przedstawiono wyniki badań twardości, wytrzymałości na zginanie oraz odporności na zużycie ścierne badanych kompozytów.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 703-708
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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