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Wyszukujesz frazę "laser sintering" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Additive Manufacturing of WC-Co by Indirect Selective Laser Sintering (SLS) using High Bulk Density Powders
Autorzy:
Gădălean, Rares Vasile
Jucan, Ovidiu-Darius
Chicinaş, Horea
Bâlc, Nicolae
Popa, Catalin O.
Powiązania:
https://bibliotekanauki.pl/articles/2106562.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
selective laser sintering
cemented carbide
polyamide 12
Opis:
Research in additive manufacturing of tungsten carbide-cobalt has intensified over the last few years due to the increasing need for products designed using topology optimisation and multiscale structures (lattice). These products result in complex shapes and contain inner structures that are challenging to produce through conventional techniques, thus involving high costs. The present work addresses this problem using a two-step approach to 3D print parts with complex shapes and internal structures by employing indirect selective laser sintering (SLS) and tungsten carbide-cobalt sintering. The paper takes further our research in this field [1] to improve the part density by using high bulk density tungsten carbide-cobalt powders. Mechanically mixing tungsten carbide-cobalt with the sacrificial binder, polyamide 12, results in a homogenous powder successfully used by the selective laser sintering process to produce green parts. By further processing, the green parts through a complete sintering cycle, an average final part density of 11.72 g/cm3 representing more than 80% of the theoretical density is achieved.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 577--585
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling, manufacturability and compression properties of the CpTi grade 2 cellular lattice with radial gradient TPMS architecture
Autorzy:
Maszybrocka, J.
Gapiński, B.
Dworak, M.
Skrabalak, G.
Stwora, A.
Powiązania:
https://bibliotekanauki.pl/articles/201748.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
selective laser sintering
additive manufacturing
cellular lattice
triply periodic minimal surfaces
mechanical properties
Opis:
In the present study, a titanium cellular lattice structure with a mathematical designed porosity gradient was successfully fabricated using the selective laser melting method. The samples with smooth gradient transition of porosity of between 60% and 80% were received for different elementary cell geometries. Elementary cells belong to the triply periodic minimal surfaces family (G, D, I2Y, IWP). Each sample was subjected to a comprehensive analysis including: dimensional metrology and assessment of material defects (X-ray micro-tomography), surface morphology tests (scanning electron microscopy) and mechanical properties (universal testing machine). It has been shown that a cellular lattice with high dimensional accuracy (+ 0.16/– 0.08 mm) and full dense struts can be obtained. According to the assumption, the gradient increases the strength of the cellular lattice samples. The highest increase in plateau stress between the samples with and without gradient was found for the I2Y series (about 185%). Furthermore, it was found that the stress-strain response of the samples depends not only on total porosity, but also on the 3D geometry of the cellular lattice. The stress-strain curves for G, IWP and I2Y samples are smooth and exhibit three characteristic regions: linear elasticity, plateau region and densification region. The size of regions depends on the geometric features of the cellular lattice. For series D, in the plateau region, the fluctuations in stress value are clearly visible. The smoothest stress-strain curve can be noted for the G series, which combined with good mechanical properties (the plateau stress and energy absorbed, at respectively 25.5 and 43.2 MPa, and 46.3J and 59.5J for Gyr_80 and Gyr_6080, which corresponds to a strain of almost 65% and 50%) positively affects the applicability of cellular structures with such geometry.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 719-727
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena jakości wykonania wybranego elementu z proszków metali metodą laserowego wytwarzania przyrostowego
Quality performance selected item metal powder by laser additive manufacturing
Autorzy:
Mazurkiewicz, A.
Nędzi, B.
Powiązania:
https://bibliotekanauki.pl/articles/317336.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
proszki metali
wytwarzanie przyrostowe
stapianie laserowe
spiekanie laserowe
metal powder
additive manufacturing
laser fusion
laser sintering
Opis:
W artykule oceniono podstawowe parametry wpływające na jakość wyrobu otrzymywanego z proszków metali metodą laserowego wytwarzania przyrostowego. Zwrócono uwagę na wpływ przyjętej technologii wytwarzania na właściwości mechaniczne materiału i związaną z tym niejednorodność struktury skutkującej wadami wyrobu. Przedstawiono zróżnicowaną budowę strukturalną materiału powstałą w różnych obszarach wyrobu. Pokazano wpływ obróbki cieplnej na ujednorodnienie struktury materiału.
The article rated basic parameters affecting the quality of the product obtained from the metal powder by laser additive manufacturing. Attention was paid to the impact of the adopted production technology on the relevant mechanical material-Justice and the related non-uniformity of the structure resulting in defective product. Shown diverse structural building material formed in different regions of the article. Shows the effect of heat treatment on the homogenization of the structure of the material.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1204-1211
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additive manufacturing for health technology applications
Autorzy:
Klimaschewski, Sven F.
Raschke, Robert
Vehse, Mark
Powiązania:
https://bibliotekanauki.pl/articles/95165.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
additive manufacturing
biocompatible hydrogel
stereolithography
selective laser sintering
wytwarzanie przyrostowe
hydrożel
stereolitografia
selektywne spiekanie laserowe
Opis:
In this study we demonstrate an overview about possibilities in using additive manufacturing for tissue engineering and orthopedic prosthesis. We show the possibilities to produce scaffolds by using a low cost commercial stereolithography system under the use of biocompatible hydrogels like Poly(ethylene glycol) diacrylate. We also demonstrate that it is possible to use a low cost selective laser sintering system to produce individual prostheses to support the healing process in many orthopedic issues.
Źródło:
Journal of Mechanical and Energy Engineering; 2019, 3, 3; 215-220
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Torsional Strength of Pa2200 Material Shape Additively with the Selective Laser Sintering Technology
Autorzy:
Bernaczek, Jacek
Dębski, Mariusz
Gontarz, Małgorzata
Grygoruk, Roman
Józwik, Jerzy
Kozik, Bogdan
Mikulski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2201927.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
torsional strength
PA2200 powder
additive manufacturing
SLS technology
SLS
Selective Laser Sintering
optical measurements
3D scanning
Opis:
The purpose of the undertaken research work is to analyze the torsional strength of standard samples with a circular cross-section, produced additively using the SLS (Selective Laser Sintering) technique – sintering PA2200 polyamide powders. The studies conducted so far have not included a static torsion test, the results of which are crucial for parts such as machine shafts, hubs, couplings, etc. Hence the idea of conducting the research in question. The samples were made in different settings relative to the machine's working platform and subjected to post-processing in two variants – by water-soaking and furnace-heating – in order to determine the influence of the orientation of the model in the manufacturing process and the type of post-processing on torsional strength. The produced samples were additionally subjected to a preliminary dimensional and shape verification due to the significant impact of the accuracy of the models in the SLS process on the operation of the above-mentioned machine parts. Based on the analysis of the test results, it was found that the highest torsional strength was determined for the furnace-heated samples. In addition, the highest mapping accuracy was found for models positioned vertically in relation to the machine's working platform.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 12--24
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of thermal, structural and morphological properties of poly(l-lactide) and poly(l-lactide)/ hydroxyapatite microspheres for laser sintering processes
Porównanie właściwości termicznych, strukturalnych oraz morfologii mikrosfer z poli(l-laktydu) i z poli(l-laktydu)/hydroksyapatytu przeznaczonych do procesu spiekania laserowego
Autorzy:
Krokos, Anna
Gazińska, Małgorzata
Kryszak, Bartłomiej
Dzienny, Paulina
Stępak, Bogusz
Olejarczyk, Michał
Gruber, Piotr
Kwiatkowski, Ryszard
Bondyra, Agnieszka
Antończak, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/947382.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
poly(l-lactide)
hydroxyapatite
microspheres
biocomposite
laser sintering
additive manufacturing
biomedical applications
sintering window
powder flowability
poli(l-laktyd)
hydroksyapatyt
mikrosfery
biokompozyt
spiekanie laserowe
techniki addytywne
zastosowania biomedyczne
okno spiekania
sypkość proszku
Opis:
A comparison of poly(l-lactide) (PLLA) and poly(l-lactide)/hydroxyapatite (PLLA/HAp) biocomposite microspheres fabricated by emulsion solvent evaporation technique designed for laser sintering (LS) applications is presented. Key properties such as thermal and structural as well as geometry, size distribution and powder flowability, which are crucial for this technique, are characterized to validate the applicability of microspheres for LS. The biocomposite microspheres turns out to be more suitable for the LS process than PLLA due to the higher thermal stability, broader sintering window and higher powder flowability.
Porównano właściwości mikrosfer z poli(l-laktydu) (PLLA) i z biokompozytu poli(l-laktyd)/ hydroksyapatyt (PLLA/HAp), przygotowanych metodą emulsyjną z odparowaniem rozpuszczalnika, przeznaczonych do procesu spiekania laserowego (LS). W celu weryfikacji przydatności mikrosfer do LS scharakteryzowano kluczowe dla tej techniki właściwości: termiczne i strukturalne oraz geometrię, rozkład wymiarów i sypkość proszku. Wykazano, iż mikrosfery biokompozytowe wykazują lepsze właściwości predestynujące je do przetwarzania metodą LS niż mikrosfery PLLA, w tym większą stabilność termiczną, szersze okno parametrów spiekania i większą sypkość proszku.
Źródło:
Polimery; 2020, 65, 9; 605-612
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of strain rate and temperature on the mechanical behaviour of additively manufactured AlSi10Mg alloy – experiment and the phenomenological constitutive modelling
Autorzy:
Stanczak, Magda
Rusinek, Alexis
Broniszewska, Paula
Fras, Teresa
Pawłowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2173665.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi10Mg aluminum alloy
additive manufacturing
DMLS method
direct metal laser sintering
compression
SHPB experiment
constitutive model
stop aluminium AlSi10Mg
produkcja dodatkowa
metoda DMLS
bezpośrednie spiekanie laserowe metali
kompresja
eksperyment SHPB
model konstytutywny
Opis:
The paper is related to the material behaviour of additively manufactured samples obtained by the direct metal laser sintering (DMLS) method from the AlSi10Mg powder. The specimens are subjected to a quasi-static and dynamic compressive loading in a wide range of strain rates and temperatures to investigate the influence of the manufacturing process conditions on the material mechanical properties. For completeness, an analysis of their deformed microstructure is also performed. The obtained results prove the complexity of the material behaviour; therefore, a phenomenological model based on the modified Johnson–Cook approach is proposed. The developed model describes the material behaviour with much better accuracy than the classical constitutive function. The resulted experimental testing and its modelling present the potential of the discussed material and the manufacturing technology.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141983
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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