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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of Laser Feeding on Heat Treated Aluminium Alloy Surface Properties
    Autorzy:
    Labisz, K.
    Tański, T.
    Janicki, D.
    Borek, W.
    Lukaszkowicz, K.
    Dobrzański, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353371.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    manufacturing and processing
    ceramic powder
    laser surface treatment
    aluminium alloys
    HPDL laser
    Opis:
    In this paper are presented the investigation results concerning microstructure as well as mechanical properties of the surface layer of cast aluminium-silicon-copper alloy after heat treatment alloyed and/ or remelted with SiC ceramic powder using High Power Diode Laser (HPDL). For investigation of the achieved structure following methods were used: light and scanning electron microscopy with EDS microanalysis as well as mechanical properties using Rockwell hardness tester were measured. By mind of scanning electron microscopy, using secondary electron detection was it possible to determine the distribution of ceramic SiC powder phase occurred in the alloy after laser treatment. After the laser surface treatment carried out on the previously heat treated aluminium alloys, in the structure are observed changes concerning the distribution and morphology of the alloy phases as well as the added ceramic powder, these features influence the hardness of the obtained layers. In the structure, there were discovered three zones: the remelting zone (RZ) the heat influence zone (HAZ) and transition zone, with different structure and properties. In this paper also the laser treatment conditions: the laser power and ceramic powder feed rate were investigated. The surface laser structure changes in a manner, that there zones are revealed in the form of. This carried out investigations make it possible to develop, interesting technology, which could be very attractive for different branches of industry.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 741-746
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing of flame sprayed Al2O3 matrix coatings containing TiO2
    Autorzy:
    Czupryński, A.
    Górka, J.
    Adamiak, M.
    Tomiczek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/356108.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flame spray process
    coating
    ceramic powder
    abrasive wear resistance
    erosion wear resistance
    adhesion strength
    Opis:
    The paper presents the results of the properties of flame sprayed ceramic coatings using oxide ceramic materials coating of a powdered aluininiuni oxide (Al2O3) matrix with 3% titanium oxide (TiO2) applied to unalloyed S235JR grade structural steel. A primer consisting of a metallic Ni-Al-Mo based powder has been applied to plates with dimensions of 5X200X300 mm and front surfaces of ø40x50 mm cylinders. Flame spraying of primer coating was made using a RotoTec 80 torch, and an external coating was made with a CastoDyn DS 8000 torch. Evaluation of the coating properties was conducted using metallographic testing, phase composition research, measurement of microhardness, substrate coating adhesion (acc. to EN 582:1996 standard), erosion wear resistance (acc. to ASTM G76-95 standard), and abrasive wear resistance (acc. to ASTM G65 standard) and thermal impact. The testing performed has demonstrated that flame spraying with 97% Al2O3 powder containing 3% TiO2 performed in a range of parameters allows for obtaining high-quality ceramic coatings with thickness up to ca. 500 μni on a steel base. Spray coating possesses a structure consisting mainly of aluminium oxide and a small amount of NiAl10O16 and NiAl32O49 phases. The bonding primer coat sprayed with the Ni-Al-Mo powder to the steel substrate and external coating sprayed with the 97%Al2O3 powder with 3% TiO2 addition demonstrates mechanical bonding characteristics. The coating is characterized by a high adhesion to the base amounting to 6.5 MPa. Average hardness of the external coating is ca. 780 HV. The obtained coatings are characterized by high erosion and abrasive wear resistance and the resistance to effects of cyclic thermal shock.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1363-1370
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Ceramic Particle Reinforced Titanium Composite Produced Via Powder Metallurgy
    Autorzy:
    Angel, D. A.
    Miko, T.
    Benke, M.
    Gacsi, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/352651.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    titanium
    ceramic particle
    nanocomposite
    mechanical property
    Opis:
    Nowadays, titanium is one of the most popular materials for aeronautical applications due to its good corrosion resistance, formability and strength. In this paper, rutile reinforced titanium matrix composites were produced via powder metallurgy. The steps included high energy ball milling of raw titanium and rutile powders in a planetary ball mill, which was followed by cold-pressing and sintering without external pressure. For the characterization of the milled powders and the sintered composites, scanning electron microscope, X-ray diffraction and compressive strength examinations were carried out. The results showed that the rutile has a strengthening effect on the titanium matrix. 1 wt% rutile increased the compressive strength compared to the raw titanium. Increasing the milling time of the metal matrix decreased the compressive strength values.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 515-519
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnesium Matrix Composite with Open-Celled Carbon Foams Obtained by Powder Metallurgy
    Autorzy:
    Olszówka-Myalska, A.
    Myalski, J.
    Godzierz, M.
    Wrześniowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351489.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium matrix composites
    ceramic-metal interpenetrating composite
    open-celled carbon foam
    powder metallurgy
    Opis:
    The preliminary results of the application of open-celled glassy-carbon foam (Cof) in magnesium matrix composites processed by the powder metallurgy method were presented. For the component consolidation, compaction with vertically-torsional vibration and hot-pressing were applied. For the material characterization, the microstructure examination LM and SEM with EDS was employed and also, the porosity and microhardness were measured. An influence of the carbon foam cells’ size on the composite porosity and microhardness was revealed. Additionally, a generation of a few micrometer thin and differently shaped MgO inclusions was observed. Differences in the oxide phase amount, size and shape in the magnesium matrix measured by the quantitative metallography method in the cross-sectioned composite elements were stated. With an increase of the distance from the composite roller top, an increase of the MgO content and microhardness was noticed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 825-831
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of aluminium-ceramic phase composites produced from P/M compacts in hot forging and extrusion processes
    Własności kompozytów aluminium-faza ceramiczna kształtowanych z wyprasek w procesach kucia i wyciskania na gorąco
    Autorzy:
    Wojtaszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/263994.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    metalurgia proszków
    proszek aluminium
    kompozyty
    włókna ceramiczne
    cząstki ceramiczne
    kucie na gorąco
    wyciskanie na gorąco
    własności fizyczne
    własności mechaniczne
    zużycie ścierne
    powder metallurgy
    aluminium powder
    composites
    ceramic particles
    ceramic fibres
    hot forging
    hot extrusion
    physical properties
    mechanical properties
    abrasive wear
    Opis:
    The results of investigations of properties of aluminium-based composites produced by means of powder metallurgy and plastic working processes are presented in the paper. Atomized aluminium po-wder was used as a metallic matrix. As a reinforcement ceramic particles and fibres were used, and their volume fraction was maintained constant at 5%. The initial material to be formed was prepared by mixing of ingredients and compaction of the obtained mixture. Aluminium powder compacts and com-posite mixtures were subjected to consolidation and deformation in closed-die hot forging and hot extrusion processes, applying the extrusion ratio X = 4.11. These processes were realized in isothermal conditions, at the temperature of 500°C. The effect of a type of reinforcing phase as well as method of deformation on selected physical, mechanical and functional properties of obtained materials was ana-lysed. It was found that the proposed method results in obtaining highly compacted products, showing mechanical and functional properties which allow to use them in structural components. The product properties can be controlled by means of selection of a type of reinforcing phase as well as method of deformation.
    W pracy zestawiono wyniki badań własności materiałów kompozytowych na osnowie aluminium, kształtowanych z zastosowaniem procesów metalurgii proszków i przeróbki plastycznej. W roli osnowy użyto rozpylany proszek aluminium. Do jej umocnienia zastosowano zbrojenie ceramiczne; cząstki oraz włókna, stosując stały ich udział objętościowy w osnowie, który wynosił 5%. Materiał wyjściowy do kształtowania przygotowano poprzez zmieszanie składników oraz ich sprasowanie na zimno. Wypraski proszku aluminium i sprasowane mieszaniny kompozytowe zagęszczano oraz kształtowano w procesach kucia na gorąco w matrycach zamkniętych oraz wyciskania na gorąco z współczynnikiem X = 4,11. Procesy te realizowano w warunkach izotermicznych, przy temperaturze 500°C. Analizowano wpływ rodzaju fazy umacniającej oraz sposobu kształtowania na wybrane własności fizyczne, mechaniczne i użytkowe otrzymanych tworzyw. Stwierdzono, że proponowana metoda prowadzi do otrzymania produktów wysoko zagęszczonych, o własnościach mechanicznych oraz użytkowych umożliwiających ich stosowanie na elementy konstrukcyjne. Właściwościami wyrobów można sterować poprzez dobór rodzaju fazy umacniającej oraz sposób ich kształtowania.
    Źródło:
    Metallurgy and Foundry Engineering; 2007, 33, 1; 63-72
    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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