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    Wyświetlanie 1-13 z 13
    Tytuł:
    Modifications ALSI7MG0.3 alloys trough CA, SR and SB
    Autorzy:
    Cais, Jaromír
    Lysoňková, Irena
    Kraus, Pavel
    Powiązania:
    https://bibliotekanauki.pl/articles/102369.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Al-Si alloy
    modifier
    microstructure
    EDX analysis
    stop Al-Si
    modyfikator
    mikrostruktura
    analiza EDX
    Opis:
    This article deals with examing the effect of modifier on changes in microstructure of the alloy AlSi7Mg0.3. The content of the experiment was to examine the effect of addition of calcium, stroncium, and antimony to change the morphology of the eutectic silicon in the alloy type of Al-Si (namely AlSi7Mg0.3). Besides changes in the morphology of eutectic silicon was explored focused on character exlusion modifiers within microstructure of the modified alloy. Examination of the microstructure was realized by scanning electron microscopy and complemented by EDX analysis of the examined samples.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 180-187
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Optimum Temperature and Calcination Time in the Production of CaO Using Seashells Waste as CaCO3 Source
    Autorzy:
    Dampang, Sarah
    Purwanti, Endah
    Destyorini, Fredina
    Kurniawan, Setyo Budi
    Abdullah, Siti Rozaimah Sheikh
    Imron, Muhammad Fauzul
    Powiązania:
    https://bibliotekanauki.pl/articles/1838407.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    characterization
    conversion
    environment
    FTIR
    SEM-EDX
    TGA
    Opis:
    Seashells waste is abundant in coastal area, especially in the locations where fisheries are a major occupation. This abundant resource of seashells opens a new opportunity further utilization. Seashells waste is a source of CaCO3, which may be converted into CaO via the calcination process. This study analyzed the characteristics of the CaO produced via calcination process at different temperature and calcination time. The calcination process was carried out at a temperature of 800°C, 900°C, and 1000°C with variation of 2, 3, and 4 hours in time. The Fourier transform infrared spectroscopy (FTIR) result showed that the spectrum of 2513 cm-1 as an indication of the C-H group containing CaO appearing after calcination. The FTIR results suggest that the calcination time did not gave major alteration to the functional groups. The results of X-ray diffraction (XRD) analysis showed that CaO laid at the angle of 58.1° and 64.6°. Scanning Electron Microscopy–Energy Dispersive X-Ray Spectroscopy (SEM-EDS) results showed that the most significant compositional outcome after the calcination process was Ca and O at all temperatures and calcination times. All calcined seashells showed rough surface and irregular shape particles. The result of a Thermogravimetric analysis (TGA) suggested that the highest mass alteration occurred at a temperature of 800°C with 78 mins of calcination time.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 5; 221-228
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of float-sink and progressive release flotation of ground products of coal middlings
    Autorzy:
    Xie, W.
    He, Y.
    Luo, C.
    Zhang, X.
    Li, H.
    Yu, J.
    Wang, H.
    Shi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/109500.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coal middlings
    float-sink
    progressive release flotation
    XPS
    EDX
    Opis:
    An additional recovery of coking coal middlings can be utilized for increasing of the concentrate yield of coking coal. A combined flow sheet of comminution and flotation can realize this target. To investigate the effect of grinding process on further flotation of ground products, progressive release flotation tests were used to compare with the float-sink tests, which were regarded as a criterion. Coal middlings were ground by wet-milling with iron balls to <0.5 mm. Curves of ash vs. cumulative yields of sized products indicated that the concentrate yield of coal separated by progressive release flotation was lower than that of coal benefited by the float-sink test, with the same ash for four size fractions (0.5-0.25 mm, 0.25-0.125 mm, 0.125-0.074 mm and <0.074 mm). Distributions of elements conducted by energy disperse spectroscopy (EDX) showed that associated kaolinite was liberated and exposed on the surface. It led to the shift of local surface property from hydrophobicity to hydrophilicity. Meanwhile, analyses of chemical property performed by an X-Ray photoelectron spectrometer (XPS) depicted that the hydrophilic mineral FeOOH, which generated in the grinding process, was adsorbed on the coal surface. Flotation of the ground products were worsened due to the increase of hydrophilicity of the coal surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 675-684
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Phase Composition of the Ag-Al Film Wear Track: Through-Thickness Characterization by Advanced Electron Microscopy
    Autorzy:
    Kryshtal, O.
    Kruk, A.
    Mao, F.
    Taher, M.
    Jansson, U.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/352230.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ag–Al alloy
    TEM
    EDX
    hexagonal phase
    electrical contact
    Opis:
    Analytical transmission electron microscopy has been applied to characterize the microstructure, phase and chemical composition of the Ag–Al wear track throughout its thickness down to the atomic level. Microscopy findings have been correlated with Ag–Al film tribological properties to understand the effect of the hexagonal solid solution phase on the tribological properties of this film. Ag–25Al (at.%) films have been produced by simultaneous magnetron sputtering of components in Ar atmosphere under 1 mTorr pressure and subjected to pin-on-disc tribological tests. It has been shown that hcp phase with (001) planes aligned parallel to the film surface dominates both in as-deposited and in tribofilm areas of the Ag–Al alloy film. Possible mechanisms of reduced friction in easily oxidized Ag–Al system are discussed and the mechanism based on readily shearing basal planes of the hcp phase is considered as the most probable one.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 251-256
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STEM-EDX and FIB-SEM Tomography of ALLVAC 718Plus Superalloy
    Autorzy:
    Kruk, A.
    Cempura, G.
    Lech, S.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354670.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TEM
    SEM
    STEM-EDX tomography
    FIB-SEM tomography
    Allvac 718Plus
    Opis:
    Allvac 718Plus (718Plus) is a high strength, corrosion resistant nickel- based superalloy used for application in power generation, aeronautics and aerospace industry. The 718Plus microstructure consists of a γ matrix with γ’-Ni3(Al,Ti) and some δ- Ni3Nb phases as well as lamellar particles (η-Ni3Ti, η*-Ni6AlNb or Ni6(Al,Ti)Nb) precipitated at the grain boundaries. The primary strengthening mechanism for this alloy is a precipitation hardening, therefore size and distribution of precipitates are critical for the performance of the alloy. The aim of this study was to characterize precipitates in the 718Plus superalloy using Scanning Transmission Electron Microscope combined with Energy Dispersive X-ray Spectroscopy (STEM-EDX) and Focused Ion Beam Scanning Electron Microscope (FIB-SEM). The STEM-EDX and FIB-SEM tomography techniques were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and EDX spectroscopy were used to reveal details of the 718Plus microstructure and allow determine chemical composition of the phases. The study showed that electron tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their 3D distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative TEM and SEM metallography.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 535-542
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Boric Acid by Surface Oxidation of Amorphous Boron Powder: Characterization and Quantitative Estimation
    Autorzy:
    Nandi, A. K.
    Ghosh, M.
    Newale, S. P.
    Jadhav, A. J.
    Prasanth, H.
    Pandey, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/358160.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    amorphous boron powder
    B2O3
    boric acid
    FTIR
    SEM
    EDX
    Opis:
    Amorphous Boron Powder (ABP) is used as a fuel in air breathing propulsion systems due to its high gravimetric and volumetric heat value. ABP is sensitive to air and undergoes slow oxidation during storage and handling, leading to the formation of a boric acid layer on the particle surface. This paper describes an analytical method for the estimation of boric acid in ABP. In-house samples obtained from the pilot plant of this laboratory, as well as commercial samples, were assayed for their boric acid content. The study is substantiated by characterization of the ABP samples by SEM with EDX and FTIR. The ageing characteristics of in-house boron powder was also studied.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 4; 387-398
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical and chemical mechanisms of hydrophobicity of nanoparticle membranes (Mg+Al2O3)
    Autorzy:
    Wahyudi, Wahyudi
    Subagyo, R.
    Gapsari, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/368531.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    hydrophobic
    superhydrophobic
    hydrophilic
    SEM-EDX
    gas bubbles
    nanoparticles
    membranes
    hydrofobowość
    superhydrofobowość
    hydrofilowość
    pęcherze gazowe
    nanocząstki
    membrany
    Opis:
    Purpose: Investigate the hydrophobic, superhydrophobic and hydrophilic properties of Alumina (Al2O3) and Magnesium (Mg) nanoparticles. Design/methodology/approach: This research was conducted by SEM-EDX analysis of Magnesium and Alumina nanoparticles, observation of gas bubbles when droplets of water contact with membrane surfaces, measurement of surface roughness and detection of Hydrogen gas production using Gas Chromatography. There are eleven compositions (Al2O3:Mg) membranes used in this study, namely: (0:100; 10:90; 20:80; 30:70; 40:60; 50:50; 60:40; 70:30; 80:20; 90:10; and 100:0). Findings: Successfully found an alloy membrane between Alumina (Al2O3) and Magnesium (Mg) nanoparticles in the composition of Mg:Al2O3 (0:100%) having Hydrophobic properties; Mg:Al2O3 (50:50%) has Superhydrophobic properties and Mg:Al2O3 (100:0%) has hydrophilic properties. Three conditions occur when H2O droplets come in contact with the membrane layer, namely: hydrophobic conditions when the trapped gas pressure is smaller than the droplet pressure. Superhydrophobic conditions when the trapped gas pressure is equal to the droplet pressure. Hydrophilic conditions occur when the trapped gas pressure is greater than the droplet pressure. Research limitations/implications: This research is limited to the hydrophobic nature of Nano Alumina (Al2O3) and Magnesium (Mg) membrane particles. Practical implications: Superhydrophobic properties are very suitable to be applied to membranes that are useful for destiny. Originality/value: The novelty of this study is to find the right mixture of nanoparticles of Alumina and Magnesium in a composition that is capable of creating hydrophobic, superhydrophobic and hydrophilic properties.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 2; 57-68
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Natural Dyes on 18th Century Liturgical Textiles from Dubrovnik
    Identyfikacja naturalnych barwnik w na XVIII-to wiecznych tekstyliach liturgicznych z Dubrownika
    Autorzy:
    Jemo, D.
    Parac-Osterman, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/231754.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    natural dyes
    liturgical textile
    UV/VIS
    SEM-EDX
    FTIR-ATR
    HPLC
    Dubrovnik
    barwniki naturalne
    szaty liturgiczne
    chromatografia
    Dubrownik
    Opis:
    In this paper researches were carried out on fragments of textiles from the 18th century from Dubrovnik, for which, based on the design and art-historical analysis, it was determined that it was a part of an object (pluvial, cope) from liturgical vestments (ecclesiastical textiles) of the Dubrovnik diocese. Using modern non-destructive and micro-destructive methods we conducted the identification of green, blue and red as the dominant tones on the artefacts of historical textiles from Dubrovnik. The identification was based on the application of modern complementary techniques: UV / VIS, HPLC, SEM-EDX and FTIR-ATR. We analysed samples of coloured fiber, as well as ones obtained by the extraction of dyes from the dyed fibers. Archival data on natural dyes used in the Dubrovnik region in the period 14-19th century was taken into account in the identification of the historical textile dyes.
    W artykule opisano badania przeprowadzone na fragmentach XVIII-to wiecznych szat liturgicznych z Dubrownika. Stosując nowoczesne metody nieinwazyjne i mało niszczące przeprowadzono identyfikację zielonego, niebieskiego i czerwonego koloru, jako dominujących tonów na artefaktach tkanin historycznych. Identyfikacja oparta była na zastosowaniu nowoczesnych technik uzupełniających: UV/VIS, HPLC, SEM-EDX oraz FTIR-ATR. Analizowano próbki włókien dokonując ekstrakcji barwników. Wyniki badań porównano z archiwalnymi danymi dotyczącymi stosowania naturalnych barwników w regionie Dubrownika w okresie XIV-XIX wieku.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 1 (121); 113-120
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of AA5083 and AA2024 reinforced with SiO2 particles
    Autorzy:
    Raja, R.
    Jannet, S.
    Thampy, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200119.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in situ reaction
    SEM
    wear rate
    stir casting
    tensile strength
    EDX
    reakcja in situ
    szybkość zużywania
    wytrzymałość na rozciąganie
    Opis:
    Among the types of different particulates, silica is a standout as one of the the cheapest and low-density particulates accessible in substantial amounts. The present study has been centered around the synthesis and study of aluminum matrix composite strengthened with nano-sized SiO2  particles of various weight percentage by means of the stir casting technique. The EDX emphasized the presence of various elements and augmented the in situ reaction. The tensile strength and wear studies were also carried out. The reinforcement materials percentage variation was one of the important factors for the present studies. The Aluminum Alloy 5083 and 2024, which are magnesium and copper-based alloys, had a significant effect on the material characterization.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 127-132
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brazing a graphite composite to molybdenum alloy TZM using active copper-based filler metals with chromium additive
    Lutowanie twarde kompozytu grafitowego ze stopem molibdenowym TZM aktywnymi spoiwami miedzianymi z dodatkiem chromu
    Autorzy:
    Mirski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351567.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grafit kompozytu CFC 222
    stop molibdenu TZM
    lutowanie
    spoiwa miedziane z dodatkiem chromu
    zwilżanie
    próba klinowa
    szczelina lutownicza
    badania metalograficzne
    EDX
    XRD
    graphite composite CFC 222
    molybdenum alloy TZM
    vacuum brazing
    copper-based brazing filler metal Cu-Cr
    wettability
    wedge test
    brazing gap
    metallographic examinations
    EDX and XRD analyses
    Opis:
    The paper presents issues of brazing the graphite composite CFC 222 with the molybdenum alloy TZM. Both materials demonstrate significant differences in physicochemical and mechanical properties that significantly affect brazing conditions and properties of the brazed joints. The performed brazing operation was preceded by a wettability test that decided selection of the filler metal. From among various copper-based filler metals, the best appeared a copper brazing filler metal with some addition of active chromium. Presented is a model of the wedge test, helpful at optimising the brazing process of two materials with different properties. Width of the brazing gap was selected on the ground of metallurgical examinations after the wedge test and transferred to the joint with a parallel gap. Applied were various forms of copper-based filler metals in that chromium was present as an alloying component, a component of the brazing paste, powder between copper covers and as a galvanic coating of a pure-copper strip. Evaluation of brazed joints of the composite CFC 222 with the TZM alloy is presented on the grounds of metallographic examinations by means of light microscopy and microhardness measurements, electron microscopy, EDX analysis of elements and XRD analysis of phase composition of the reactive zone.
    W pracy przedstawiono problematykę lutowania twardego kompozytu grafitowego CFC 222 ze stopem molibdenowym TZM. Obydwa materiały wykazują znaczne różnice we właściwościach fizykochemicznych i mechanicznych, które mają istotny wpływ na warunki lutowania i właściwości uzyskanych połączeń lutowanych. Wykonanie połączeń poprzedziła próba zwilżalności, która zdecydowała o wyborze lutu. Spośród różnych lutów na osnowie miedzi najlepszy okazał się lut miedziany z dodatkiem aktywnego chromu. Przedstawiono model próby klinowej, pomocny w optymalizacji procesu lutowania obydwu materiałów zróżnicowanych właściwościach. Na podstawie próby klinowej, w wyniku badań metalograficznych, dobrano szerokość szczeliny lutowniczej i przeniesiono ją na złącze ze szczeliną równoległą. Stosowano różne postacie lutów miedzianych, w których chrom występował jako składnik stopowy, składnik pasty lutowniczej, proszek między okładkami miedzianymi i jako pokrycie galwaniczne taśmy z czystej miedzi. Ocenę połączeń lutowanych kompozytu CFC 222 ze stopem molibdenowym TZM przedstawiono na podstawie badań metalograficznych za pomocą mikroskopii świetlnej i pomiarów mikrotwardości, mikroskopii elektronowej, analizy pierwiastków metodą EDX oraz analizy składu fazowego strefy reakcyjnej metodą dyfrakcji rentgenowskiej XRD.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 3; 829-837
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimicrobial Characteristics of Pulsed Laser Deposited Metal Oxides on Polypropylene Hydroentangled Nonwovens for Medical Textiles
    Właściwości przeciwdrobnoustrojowe włóknin polipropylenowych pokrytych tlenkami metali stosowanych w wyrobach medycznych
    Autorzy:
    Ramamurthy, P.
    Chellamani, K. P.
    Dhurai, B.
    ThankaRajan, S. P.
    Subramanian, B.
    Santhini, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/949467.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    antibacterial activity
    metal oxides
    pulsed laser deposition
    energy dispersive X-ray
    EDX
    polypropylene
    hydroentangled nonwoven
    działanie antybakteryjne
    tlenki metali
    polipropylen
    włóknina
    wyroby medyczne
    Opis:
    In this study, an attempt was made to investigate the antimicrobial activity on polypropylene (PP) hydroentangled nonwoven fabrics coated with transition metal oxides. After etching the nonwoven fabrics with RF plasma, nano-scale coatings of ZnO and CuO were done using the KrF excimer based pulsed laser deposition technique (PLD). Morphological and antimicrobial studies were carried out to elucidate the mechanism of antibiocidal behaviour of the coated fabrics. Results showed significant antibacterial activity of ZnO and CuO coated PP hydroentangled nonwovens with a better activity against gram positive S.aureus than gram negative E.coli. Inherently non-toxic, PP has excellent chemical resistance and the use of specialised PP fibres for hydroentangled nonwovens could offer scope in addition to metal oxide coatings; nano-scale biological materials such as enzymes and drugs could add specific functionality for their use as medical textiles.
    W pracy podjęto próbę zbadania aktywności przeciwdrobnoustrojowej polipropylenowych włóknin pokrytych tlenkami metali. Przeprowadzono badania morfologiczne i przeciw- drobnoustrojowe powlekanych włóknin. Wyniki wykazały znaczną aktywność antybakteryjną włóknin pokrytych ZnO i CuO, przy czym wyższą aktywność antybakteryjną zaobserwowano wobec bakterii Gram-dodatnich (Staphylococcus ureus), niż wobec Gram-ujemnych (Escherichia coli). Stwierdzono, że zastosowanie nietoksycznego polipropylenu, który charakteryzuje się bardzo dobrą odpornością chemiczną, do wytwarzania włóknin powlekanych tlenkami metali pozwala na otrzymanie funkcjonalnych produktów medycznych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 2 (122); 112-119
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray techniques in the investigation of a Gothic sculpture : the risen Christ
    Autorzy:
    Mikołajska, A.
    Walczak, M.
    Kaszowska, Z.
    Urbańczyk-Zawadzka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146866.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cultural heritage
    X-ray image
    X-ray dual source computed tomography (DSCT)
    scanning electron microscopy energy dispersed X-ray spectroscopy (SEM-EDX)
    Opis:
    For over a century, X-ray radiation has played an important role in the area of the conservation and restoration of cultural heritage objects. X-ray techniques are amongst the most fundamental and helpful methods used in the investigation of art works. This paper reviews the application of traditional radiography, X-ray dual source computed tomography (DSCT) and scanning electron microscopy combined with energy dispersed X-ray spectroscopy (SEM-EDX) to the investigation of a wooden, Gothic sculpture, The risen Christ. Thanks to the properties of X-ray radiation (different absorption by various materials) first two methods allow the assessment of the preservation state and the observation of the internal structure of an object in 3-D. While SEM-EDX analysis permits the elemental analysis of the polychrome layers. As a result 2-D and 3-D images, permitting the full volume inspection of an object, were taken in a totally non-destructive way. The morphological and physical information about the inner structure of the investigated wooden sculpture was obtained, revealing changes related to previous restorations, as well as ageing effects. Employing the SEM-EDX, painting materials (pigments and filers), were identified. Gained data is essential for restorers to understand the whole structure of the studied object and to decide which further investigation and restoration steps have to be undertaken.
    Źródło:
    Nukleonika; 2012, 57, 4; 627-631
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure, SDAS and Mechanical Properties of A356 alloy Castings Made in Sand and Granulated Blast Furnace Slag Moulds
    Autorzy:
    Jinugu, B. R.
    Inampudi, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379468.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silica sand
    slag
    CO2 process
    casting aluminium alloys
    SEM-EDX
    mechanical properties
    piasek kwarcowy
    żużel
    proces CO2
    odlew ze stopów aluminium
    właściwości mechaniczne
    Opis:
    Investigations were carried out to ensure the granulated blast furnace (GBF) slag as an alternative mould material in foundry industry by assessing the cast products structure property correlations. Sodium silicate-CO2 process was adopted for preparing the moulds. Three types of moulds were made with slag, silica sand individually and combination of these two with 10% sodium silicate and 20 seconds CO2 gassing time. A356 alloy castings were performed on these newly developed slag moulds. The cast products were investigated for its metallography and mechanical properties. Results reveal that cast products with good surface finish and without any defects were produced. Faster heat transfers in slag moulds enabled the cast products with fine and refined grain structured; and also lower Secondary Dendrite Arm Spacing (SDAS) values were observed than sand mould. Slag mould casting shows improved mechanical properties like hardness, compression, tensile and impact strength compared to sand mould castings. Two types of tensile fracture modes, namely cleavage pattern with flat surfaces representing Al−Si eutectic zone and the areas of broken Fe-rich intermetallic compounds which appear as flower-like morphology was observed in sand mould castings. In contrast, GBF slag mould castings exhibit majority in dimple fracture morphology with traces of cleavage fracture. Charpy impact fractured surfaces of sand mould castings shows both transgranular and intergranular fracture modes. Only intergranular fracture mode was noticed in both GBF slag and mixed mould castings.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 179-191
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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