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Wyświetlanie 1-15 z 38
Tytuł:
Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
Autorzy:
Yoo, Hyo-Sang
Kim, Yong-Ho
Kim, Cheol-Woo
Son, Hyeon-Taek
Powiązania:
https://bibliotekanauki.pl/articles/2203721.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe powder
heat-treatment
microstructure
density
Opis:
In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a significant role in the improvement of the densification and magnetic properties.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 47--50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Fe Content on the Mechanical Properties and Thermal Conductivity of the Al-RE Alloys
Autorzy:
Yoo, Hyo-Sang
Kim, Yong-Ho
Son, Hyeon-Taek
Powiązania:
https://bibliotekanauki.pl/articles/356397.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum
extrusion
rare earth
thermal conductivity
mechanical property
Opis:
In this study, we investigated the effect of Fe addition (0, 0.25, 0.50 and 0.75 wt.%) on the microstructure, mechanical properties and electrical conductivity of as-cast and as-extruded Al-RE alloys. As the Fe element increased by 0 and 0.75wt.%, the phase fraction increased to 5.05, 5.76, 7.14 and 7.38 %. The increased intermetallic compound increased the driving force for recrystallization and grain refinement. The electrical conductivity of Al-1.0 wt.%RE alloy with Fe addition decreased to 60.29, 60.15, 59.58 and 59.13 % IACS. With an increase in the Fe content from 0 to 0.75 wt.% the ultimate tensile strength (UTS) of the alloy increased from 74.3 to 77.5 MPa. As the mechanical properties increase compared to the reduction of the electrical conductivity due to Fe element addition, it is considered to be suitable for fields requiring high electrical conductivity and strength.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1029-1033
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Życie kulturalne Polaków w Mandżurii w latach 1897–1947
Cultural life of Poles in Manchuria, 1897–1947
Autorzy:
Yong-Deog, Kim
Powiązania:
https://bibliotekanauki.pl/articles/511299.pdf
Data publikacji:
2010
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Poles in Manchuria
Manchuria
Opis:
The article is dedicated to the Polish colony in Manchuria, which came into being at the turn of the 19th and 20th centuries and lasted for over 50 years. In successive parts, the author discusses manifestations of cultural life of Poles in Manchuria. He concentrates mostly on Polish cultural institutions created by Poles, the magazines they published. The author points out the merits of some greatest representatives of the colony. The important role was also played by Polish Consulate in Harbin and its workers dedicated to their tasks. After the Second World War broke out, the situation of Polish community became more difficult, and the colony ceased to exist under communist regime in China. Poles left and material traces of their residence in Manchuria also ceased to exist.
Źródło:
Postscriptum Polonistyczne; 2010, 2(6); 117-142
1898-1593
2353-9844
Pojawia się w:
Postscriptum Polonistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of Metal Gas Filter by Material Extrusion Additive Manufacturing Process
Autorzy:
Yi, Yu-Jeong
Lee, Min-Jeong
Yun, Su-Jin
Park, Manho
Kim, Ju-Yong
Lee, Jungwoo
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/2174560.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas filter
additive manufacturing
stainless steel
porosity
powder size
Opis:
Recently, 3D printing processes have been used to manufacture metal powder filters with manufacturing complex-shape. In this study, metal powder filters of various shapes were manufactured using the metal extrusion additive manufacturing (MEAM) process, which is used to manufacture three-dimensional structures by extruding a filament consisting of a metal powder and a binder. Firstly, filaments were prepared by appropriately mixing SUS316 powder with sizes ranging from 7.5 µm to 50 µm and a binder. These filaments were extruded at temperatures of 100℃ to 160℃ depending on the type of filament being manufactured, to form three types of cylindrical filter. Specimens were sintered in a high vacuum atmosphere furnace at 850℃ to 1050℃ for 1 hour after debinding. The specimens were analyzed for permeability using a capillary flow porometer, porosity was determined by applying Archimedes’ law and microstructure was observed using SEM.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1517--1520
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Efficiency Cooling System Using Additive Manufacturing
Autorzy:
Woo, Yeong-Jin
Nam, Dong-Ho
Lee, Seok-Rok
Kim, Eun-Ah
Lee, Woo-Jin
Yang, Dong-Yeol
Yu, Ji-Hun
Park, Yong-Ho
Lee, Hak-Sung
Powiązania:
https://bibliotekanauki.pl/articles/2049198.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
DfAM
Design for Additive Manufacturing
cooling system
lattice structure
simulation
Opis:
In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 689-693
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Post-Heat Treatment on the Impact Toughness and Crack Propagation Mechanism of AISI D2 Tool Steel Manufactured by Direct Energy Deposition
Autorzy:
Park, Jun-Hyung
Kim, Kyu-Sik
Koo, Yong-Mo
Kim, Jin-Young
Kim, Min-Chul
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2203722.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI D2 tool steel
direct energy deposition
post-heat treatment
impact toughness
fractography
Opis:
This study investigated the effect of heat treatment on the microstructure and impact toughness property of AISI D2 manufactured with direct energy deposition (DED) and compared the results with conventional wrought material. The fracture crack propagation behavior was examined in connection with microstructures through fracture surface analysis. AISI D2 manufactured with DED had a eutectic structure that turned into a net-type carbide after heat treatment, and Cr-rich needle-type secondary carbide was observed. Impact toughness of DED AISI D2 measured 2.0 J/cm2 in the as-built sample and 1.1 J/cm2 in the heat-treated sample. Compared to a wrought heat-treated AISI D2, DED AISI D2 had relatively low impact toughness. DED AISI D2 and wrought material had different crack propagation mechanisms. In DED AISI D2, the eutectic structure and net-type carbide boundary were identified as the major microstructural factor decreasing impact toughness.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 119--122
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nation Branding through Internationalization of Higher Education: A Case Study of African Students in South Korea
Autorzy:
Park, Jeong Kyung
Kim, Yong Deog
DeMatteo, Kaia
Powiązania:
https://bibliotekanauki.pl/articles/2004916.pdf
Data publikacji:
2016-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
African students
globalization
higher education
internationalization
nation branding
South Korea
Opis:
This study focuses on the effect that internationalization of higher education has on the nation branding of South Korea. To better understand the role that international students in higher education play in nation branding, research is needed on the actual experiences of international students in the country. In this study, current and former African university students’ experiences living and studying in South Korea are investigated. This study, therefore, uses the nation branding framework within the context of South Korea and the role of higher education as an image enhancement strategy geared toward global public inclusion; its focus is on the experiences of African students. In order to obtain multiple perspectives on African student experiences, a survey was conducted using a questionnaire. The empirical evidence obtained in this study demonstrates that African students’ experiences in South Korea are relevant in their perceptions of the host country. The results suggest the positive impact that the South Korean government has on improving the country’s image through encouragement of internationalization of higher education, especially among African students who come to the country for their tertiary education.
Źródło:
The New Educational Review; 2016, 45; 52-63
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Charge Carrier Transport Behaviors in Zirconium Oxide for Nuclear Cladding Materials
Autorzy:
Park, Il-Kyu
Lee, Sang-Seok
Mok, Yong Kyoon
Jeon, Chan-Woo
Kim, Hyun-Gil
Powiązania:
https://bibliotekanauki.pl/articles/351043.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zirconium
nuclear cladding
Zr oxide
capacitance-voltage
current-voltage
Opis:
Dynamic charge carrier transport behavior in the zirconium (Zr) oxide was investigated based on the frequency-dependent capacitance-voltage (C-V) and temperature-dependent current-voltage (I-V) measurements. The Zr oxide was formed on the ZIRLO and newly developed zirconium-based alloy (NDZ) by corrosion in the PWR-simulated loop at 360°C. The corrosion test for 90 days showed that the NDZ exhibits better corrosion resistance than ZIRLO alloy. Based on the C-V measurement, dielectric constant values for the Zr oxide was estimated to be 11.28 and 11.52 for the ZIRLO and NDZ. The capacitance difference between low and high frequency was larger in the ZIRLO than in the NDZ, which was attributed to more mobile electrical charge carriers in the oxide layer on the ZIRLO alloy. The current through the oxide layers on the ZIRLO increased more drastically with increasing temperature than on the NDZ, which indicating that more charge trap sites exist in the ZIRLO than in NDZ. Based on the dynamiccharge carrier transport behavior, it was concluded that the electrical charge carrier transport within the oxide layers was closely related with the corrosion behavior of the Zr alloys.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1063-1067
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System
Autorzy:
Moon, Tae Boong
Han, Chulwoong
Hyun, Soong-Keun
Park, Sung Cheol
Son, Seong Ho
Lee, Man Seung
Kim, Yong Hwan
Powiązania:
https://bibliotekanauki.pl/articles/2049176.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spent lithium-ion battery
smelting
Al2O3-SiO2-CaO-Fe2O3
recovery
slag
Opis:
This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250°C for 30 min on the 20 Al2O3-40SiO2-20Cao-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O2 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20 Al2O3-40SiO2-Cao-Fe2O3 (Cao + Fe2O3 = 40 mass%). in addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 983-986
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of High-Purity Tantalum Metal Powder for Capacitors Using Self-Propagating High-Temperature Synthesis
Autorzy:
Lee, Yong-Kwan
Sim, Jae-Jin
Byeon, Jong-Soo
Lee, Yong-Tak
Cho, Yeong-Woo
Kim, Hyun-Chul
Heo, Sung-Gue
Lee, Kee-Ahn
Seo, Seok-Jun
Park, Kyoung-Tae
Powiązania:
https://bibliotekanauki.pl/articles/2049150.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tantalum
self-propagating high-temperature synthesis
tantalum oxide
magnesium
capacitor
Opis:
In this study, high-purity tantalum metal powder was manufactured via self-propagating high-temperature synthesis. During the process, Ta2O5 and Mg were used as the raw material powder and the reducing agent, respectively, and given that combustion rate and reaction temperature are important factors that influence the success of this process, these factors were controlled by adding an excessive mass of the reducing agent (Mg) i.e., above the chemical equivalent, rather than by using a separate diluent. It was confirmed that Ta metal powder manufactured after the process was ultimately manufactured 99.98% high purity Ta metal powder with 0.5 μm particle size. Thus, it was observed that adding the reducing reagent in excess favored the manufacture of high-purity Ta powder that can be applied in capacitors.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 935-939
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cooling Rate on the Microstructure and Mechanical Properties of Al-33 wt.% Cu Alloy
Autorzy:
Lee, Yeon-Joo
Kwon, Do-Hun
Cha, Eun-Ji
Song, Yong-Wook
Choi, Hyun Joo
Kim, Hwi-Jun
Powiązania:
https://bibliotekanauki.pl/articles/2203708.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser melting
cooling rate
lamellar spacing
hardness
Al-33wt.%Cu alloy
Opis:
Directed energy deposition (DED) is an additive manufacturing process wherein an energy source is focused on a substrate on which a feedstock material is simultaneously delivered, thereby forming a small melt pool. Melting, solidification, and subsequent cooling occur at high rates with considerable thermal gradients compared with traditional metallurgical processes. Hence, it is important to examine the effects of cooling rates on the microstructures and properties of the additive manufactured materials. In this study, after performing DED with various energy densities, we investigated the changes in the microstructures and Vickers hardness of cast Al-33 wt.% Cu alloy, which is widely used to estimate the cooling rate during processing by measuring the lamellar spacing of the microstructure after solidification. The effects of the energy density on the cooling rate and resultant mechanical properties are discussed, which suggests a simple way to estimate the cooling rate indirectly. This study corresponds to the basic stage of the current study, and will continue to apply DED in the future.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 43--46
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Characterization of U-10wt.%Zr Fuel Slugs Containing Rare-Earth Elements Prepared by Modified Injection Casting
Autorzy:
Lee, Sang-Hun
Kim, Ki-Hwan
Kuk, Seoung-Woo
Park, Jeong-Yong
Choi, Ji-Hoon
Powiązania:
https://bibliotekanauki.pl/articles/355802.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
U-Zr
rare-earth element
microstructure
injection casting
sodium-cooled fast reactor
SFR
Opis:
U-10wt.%Zr metallic fuel slugs containing rare-earth (RE: a rare-earth alloy comprising 53% Nd, 25% Ce, 16% Pr and 6% La) elements for a sodium-cooled fast reactor were fabricated by modified injection casting as an alternative method. The distribution, size and composition of the RE inclusions in the metallic fuel slugs were investigated according to the content of the RE inclusions. There were no observed casting defects, such as shrunk pipes, micro-shrinkage or hot tears formed during solidification, in the metallic fuel slugs fabricated by modified injection casting. Scanning electron micrographs and energy-dispersive X-ray spectroscopy (SEM-EDS) showed that the Zr and RE inclusions were uniformly distributed in the matrix and the composition of the RE inclusions was similar to that of a charged RE element. The content and the size of the RE inclusions increased slightly according to the charge content of the RE elements. RE inclusions in U-Zr alloys will have a positive effect on fuel performance due to their micro-size and high degree of distribution.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 953-957
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Mobile Technologies to Promote Scientific Discovery Learning in Elementary School
Autorzy:
Lee, June
Koo, Yangmi
Kim, Yong-Lyun
Powiązania:
https://bibliotekanauki.pl/articles/26184010.pdf
Data publikacji:
2013-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mobile technology
discovery learning
Smart Science
Opis:
The purpose of the study was to identify educational effects of a new learning method that integrates mobile-technology-based science learning with activity oriented discovery learning. The major finding of the study was that the mobile technology-based Science program enabled students to learn scientific knowledge through associated activities and creatively apply their knowledge to complete the mission of the learning. Also, the study found that the use of tablet PCs and SNS for scientific inquiry activities facilitated students to learn in fun ways, to collaborate with other students, and to share what they have learned with each other.
Źródło:
The New Educational Review; 2013, 32; 264-274
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Women’s Career Development Towards School Superintendency: An Investigation into the Effect of Tacit Learning
Autorzy:
Kim, Yong-Lyun
Powiązania:
https://bibliotekanauki.pl/articles/26469813.pdf
Data publikacji:
2013-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
school superintendency
women administrators
career development
tacit learning
Opis:
Career development can be discussed in two primary ways: 1) as a type of formal education and job preparation that a person receives; and 2) as a type of informal learning-related career experiences that a person encounters. This study investigates the effect of learning preparedness on female school administrators’ career development. For the data analysis, this study uses the Structural Equation Modeling statistics. The findings from the analysis support the view that tacit learning from both direct and indirect job experiences has a greater effect on women’s career development than formal learning. The effect of these factors, however, varies according to women’s aspirations for superintendency.
Źródło:
The New Educational Review; 2013, 31; 241-251
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Si Addition on Microstructure and Mechanical Properties of the Al Alloys with High Cr Content Prepared by Gas Atomization and SPS Processes
Autorzy:
Kim, Yong-Ho
Oh, Ik-Hyun
Yoo, Hyo-Sang
Park, Hyun-Kuk
Lee, Jung-Han
Son, Hyeon-Taek
Powiązania:
https://bibliotekanauki.pl/articles/354961.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Cr-Si
gas atomization
spark plasma sintering
powder
rapid solidification
Opis:
This research describes effects of Si addition on microstructure and mechanical properties of the Al-Cr based alloys prepared manufactured using gas atomization and SPS (Spark Plasma Sintering) processes. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). Microstructure of the as-atomized Al-Cr-Si alloys with high contents of Cr and Si was composed multi-phases with hard and thermally stable such as Al13Cr4Si4, AlCrSi, Al8Cr5 and Cr3Si intermetallic compounds. The average hardness values were 703 Hv for S5, 698 Hv for S10 and 824 Hv for S20 alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with hard and thermally stable and fine microstructure by the addition of high Cr and Si using rapid solidification and SPS process.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1045-1049
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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