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Wyświetlanie 1-9 z 9
Tytuł:
The influence of the microstructure on the switching properties of Ag C, Ag-WC-C and Ag-W-C contact materials
Wpływ mikrostruktury na właściwości łączeniowe kompozytowych materiałów stykowych Ag-C, Ag-WC-C i Ag-W-C
Autorzy:
Wójcik-Grzybek, D.
Frydman, K.
Borkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/356517.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical contacts
microstructure
switching properties
mechanical alloying
materiały stykowe
mikrostruktura
właściwości łączeniowe
mechaniczna synteza
Opis:
The correlation between the microstructure of Ag-C, Ag-WC-C and AgWC composites and their switching properties was investigated. Two methods were used to manufacture the starting powder mixtures, namely classical milling and mechanical alloying . The arc erosion, contact resistance and welding forces of the contact materials obtained by different methods were measured using model devices. This paper presents the results achieved for the tested materials. It was found that weight loss was lower for the contacts produced by high energy milling.
W pracy badano wpływ mikrostruktury kompozytów Ag-C oraz Ag-WC-C i Ag-W-C na ich właściwości łączeniowe. Do wytworzenia kompozytów stosowano dwa sposoby przygotowania mieszanin wyjściowych: klasyczne mieszanie proszków oraz mechaniczną syntezę (MA - mechanical allaying). Porównano odporność kompozytowych materiałów stykowych wykonanych różnymi technologiami na erozję łukową, rezystancje zestykową i odporność na sczepianie. Badania właściwości łączeniowych prowadzono w układach modelowych. Stwierdzono, że zastosowanie procesu MA do przygotowania mieszanin wyjściowych powoduje wzrost odporności na erozję badanych materiałów.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1059-1065
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Studies of Ag/TiO2 Thin Film; Effect of Annealing Temperature
Autorzy:
Kamrosni, Abdul Razak
Dewi Suryani, Che Halin
Azliza, Azani
Mohd Mustafa Al Bakri, Abdullah
Mohd Arif Anuar, Mohd Salleh
Norsuria, Mahmed
Chobpattana, Varistha
Kaczmarek, L.
Jeż, Bartłomiej
Nabiałek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2048839.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ag/TiO2
annealing temperature
microstructure
optical properties
thin film
Opis:
Microstructures are an important link between materials processing and performance, and microstructure control is essential for any materials processing route where the microstructure plays a major role in determining the properties. In this work, silverdoped titanium dioxide (Ag/TiO2) thin film was prepared by the sol-gel method through the hydrolysis of titanium tetra-isopropoxide and silver nitrate solution. The sol was spin coated on ITO glass substrate to get uniform film followed by annealing process for 2 hours. The obtained films were annealed at different annealing temperatures in the range of 300°C-600°C in order to observe the effect on crystalline state, microstructures and optical properties of Ag/TiO2 thin film. The thin films were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectrophotometry. It is clearly seen, when the annealing temperature increases to 500°C, a peak at 2θ = 25.30° can be seen which refers to the structure of TiO2 tetragonal anatase. The structure of Ag/TiO2 thin film become denser, linked together, porous and uniformly distributed on the surface and displays the highest cut-off wavelength value which is 396 nm with the lowest band gap value, which is 3.10 eV.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 241-245
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies into new, environmentally friendly Ag-Cu-Zn-Sn brazing alloys of low silver content
Badania nowych, ekologicznych spoiw twardych Ag-Cu-Zn-Sn o niskiej zawartości srebra
Autorzy:
Wierzbicki, L. J.
Malec, W.
Stobrawa, J.
Cwolek, B.
Juszczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/354086.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kadm
srebro
spoiwa ekologiczne
stopy lutownicze
właściwości mechaniczne
mikrostruktura
skład fazowy
cadmium
silver
environmentally friendly alloys
brazing alloys
mechanical properties
microstructure
phase composition
Opis:
The paper present selected results of the research conducted for elimination of toxic cadmium from silver based brazing alloys of Ag-Cu-Zn-Cd type. The investigations were conducted with nine new alloys of constant, low silver content (25%) and diversified copper (38.8-46%), zinc (19-32%) and tin (3-10%) contents. Tin was selected as potentially the best cadmium substitute basing on literature review and analysis of equilibrium systems. For examinations and tests a series of ingots in laboratory scale was manufactured, as well as some ingots in pilot scale for the selected, most promising alloys. Complex metallographic examinations of the brazing alloys samples produced in various conditions were made as well as analyses of their phase composition. Also mechanical properties of the samples both in ambient and in elevated temperatures were examined, and physical and technological properties and usability of the alloys were determined. The last stage of the study covered laboratory trials of brazing using the selected alloys. Basing on the results it can be said that there is a possibility to substitute selected cadmium containing silver-based alloys with environmentally friendly alloys of Ag-Cu-Zn-Sn type of relatively low silver content. Low range of melting point was reached, as preliminary assumed. Mechanical properties of the studied alloys strongly depend on temperature, and present limited plasticity in room temperature, while at high temperature (over 500°C) present superplasticity. The examined alloys show good spreadability and the brazing tests confirmed their good reactions both with copper and brass base in a wide temperature range.
W niniejszym artykule przedstawiono wybrane wyniki prac, których celem jest wyeliminowanie toksycznego kadmu ze srebrowych spoiw twardych typu Ag-Cu-Zn-Cd. Badaniami objęto 9 nowych gatunków stopów o stałej, niskiej zawartości srebra (25%) oraz zróżnicowanej zawartości miedzi (38,8-46%), cynku (19-32%) oraz cyny (3-10%). Cyna została wytypowana, na podstawie analizy literaturowej oraz układów równowagowych, jako potencjalnie najlepszy zamiennik kadmu. Wytworzono szereg wlewków w skali laboratoryjnej oraz dla wybranych, najbardziej obiecujących gatunków spoiw, wlewki w skali półtechnicznej przeznaczone do badań i prób. Przeprowadzono kompleksowe badania metalograficzne próbek spoiw wytworzonych w róznych warunkach oraz dokonano analizy skżadu fazowego. Wykonano także badania wżaściwości mechanicznych próbek zarówno w temperaturze otoczenia jak i podwyższonej oraz badania właściwości fizycznych, technologicznych i użytkowych. W ostatnim etapie pracy przeprowadzono laboratoryjne próby lutowanie przy zastosowaniu wybranych spoiw. Uzyskane wyniki badań pozwalają stwierdzić, że możliwe jest zastąpienie wybranych gatunków spoiw srebrowych kadmowych stopami ekologicznymi z grupy Ag-Cu-Zn-Sn o stosunkowo niskiej zawartości srebra. Uzyskano, zakładany we wstępnym etapie prac, niski zakres temperatury topnienia. Właściwości mechaniczne badanych stopów silnie zależą od temperatury, charakteryzują się one ograniczoną plastycznościa w temperaturze pokojowej, by w wysokiej temperaturze (ponad 500°C) wykazywać cechy nadplastyczne. Badane spoiwa charakteryzują się dobrą rozpływnością, a próby lutowania wykazały, że dobrze reagują zarówno z podłożem miedzianym jak i mosiężnych w szerokim zakresie temperatury.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 1; 147-158
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Facile Method for the Production of Sn-Ag Alloy by High Energy Ball Milling
Autorzy:
Sharma, Ashutosh
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/353739.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Pb-free
solder
electronics
ball milling
microstructure
Opis:
In this study, we have developed Sn-Ag alloy by a simple high energy ball milling technique. We have ball-milled the eutectic mixture of Sn and Ag powders for a period of 45 h. The milled powder for 45 h was characterized for particle size and morphology. Microstructural investigations were carried out by scanning electron microscopy and X-ray diffraction studies. The melting behavior of 45 h milled powder was studied by differential scanning calorimetry. The resultant crystallite size ofthe Sn(Ag) solid solution was found to be 85 nm. The melting point of the powder was 213.6°C after 45 h of milling showing depression of ≈6°C in melting point as compared to the existing Sn-3.5Ag alloys. It was also reported that the wettability of the Sn-3.5Ag powder was significantly improved with an increase in milling time up to 45 h due to the nanocrystalline structure of the milled powder.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1329-1333
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brazeability and Microstructure of Ag-28Cu Microjoining Filler Produced by High Energy Ball Milling
Autorzy:
Sharma, Ashutosh
Chae, Myoung Jin
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/356672.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
filler
microjoining
dissimilar
ball milling
microstructure
Opis:
In this paper, we have studied the evolution of morphology and brazing behavior of Ag-28Cu alloy filler processed by high energy ball milling. The milling of the powder mixture was carried out for 40 h. The structural and morphological analyses were performed by the X-ray diffraction and scanning electron microscopy. The melting temperature of the braze filler was determined by differential thermal analysis. The filler wetting properties were assessed from the spread area ratio measurements on various Ti substrates. The results indicate that the ball milling can effectively depress the filler melting point and enhance the brazeability. The milled powder mixture showed Ag(Cu) solid solution with a crystallite size of 174-68 nm after 40 h. It was shown that the high energy ball milling can be a potential method to develop low temperature brazing fillers for advanced microjoining applications.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1323-1327
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Aspects of Fatigue Life of Sn-Zn Lead-free Solders with 1% of Ag Addition
Autorzy:
Pietrzak, K.
Klasik, A.
Maj, M.
Sobczak, N.
Wojciechowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/382245.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lead-free solders
microstructure
mechanical properties
lutowanie bezołowiowe
mikrostruktura
właściwości mechaniczne
Opis:
The article presents the study results of Sn-Zn lead-free solders with the various Zn content. The results concern the hypoeutectic, eutectic and hypereutectic alloys containing respectively 4.5% Zn, 9% Zn and 13.5% Zn. Moreover, these alloys contain the constant Ag (1%) addition. The aim of the study was to determine the microstructural conditionings of their fatigue life. In particular it was focused on answer the question what meaning can be assigned to the Ag addition in the chemical composition of binary Sn-Zn alloys. The research includes a qualitative and quantitative assessments of the alloy microstructures, that have been carried out in the field of light microscopy (LM). In order to determine some geometrical parameters of the microstructure of alloys the combinatorial method based on the phase quanta theory was applied. Moreover, for the identification necessities the chemical analyses in the micro-areas by SEM/EDS technics were also performed. Based on the SEM/EDS results the phases and intermetallic compounds existing in the examined lead-free solders were identified. The mechanical characteristics were determined by means of the modified low cycle test (MLCF). Based on this method and on the results obtained every time from only one sample the dozen of essential mechanical parameters were evaluated. The research results were the basis of analyzes concerning the effects of microstructural geometrical parameters of lead-free alloys studied on their fatigue life at ambient temperature.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 87-92
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Macroscopic Properties of Filler Metal (BCuP-5) on Cu-plate using Laser Cladding Process
Autorzy:
Lee, Kee-Ahn
Park, Joo Hyun
Joo, Yeun Ah
Powiązania:
https://bibliotekanauki.pl/articles/352063.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
BCuP-5(Cu-15Ag-5P)
microstructure
switching device
multi-layer
Opis:
This study stacked a thin, dense BCuP-5 (Cu-Ag-P based filler metal) on a Cu-plate using the laser cladding (L.C) process to develop a method to manufacture Ag reducing multilayer clad electrical contact material with an Ag-M(O)/Ag/Cu/BCuP-5 structure. Then, the microstructure and macroscopic properties of the manufactured BCuP-5 coating layer were analyzed. The thickness of the manufactured coating layer was approximately 1.7 mm (maximum). Microstructural observation of the coating layer identified Cu, Ag and Cu-Ag-Cu3P ternary eutectic phases like those in the initial BcuP-5 powder. To evaluate the properties of the manufactured coating layer, hardness and adhesion strength tests were performed. The average hardness of the laser cladded coating layer was 183.2 Hv, which is 2.6 times greater than conventional brazed BcuP-5. The average pull-off strength measured using the stud pull test was 341.6 kg/cm2. Cross-sectional observation of the pulled-off material confirmed that the coating layer and substrate maintained a firm adhesion after pull-off. Thus, the actual adhesion strength of Cu/BcuP-5 was inferred to be greater than 341.6 kg/cm2. Based on the above findings, it was confirmed that it is possible to manufacture a sound Ag reducing multilayer clad electrical contact material using the laser cladding process.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 559-563
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure Evolution and Formation Mechanism of Copper-Silver Alloy Fabricated by Induction Heating Directional Solidification at Different Mold Temperatures
Autorzy:
Luo, Jihui
Li, Yangyang
Huang, Yanke
Huang, Yuehao
Zheng, Yuling
Powiązania:
https://bibliotekanauki.pl/articles/2049416.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction heating directional solidification
Cu-Ag alloy
mold temperature
microstructure
Opis:
Cu-2wt%Ag alloy with diameter of 10 mm was fabricated by induction heating directional solidification (IHDS). The effect of different mold temperatures on microstructure of IHDS Cu-2wt%Ag alloy was investigated. The results show that IHDS Cu-2wt%Ag alloy is mainly composed of coarse columnar grains at mold temperature of 1075°C. While the mold temperature is at 1100°C, 1150°C and 1200°C, respectively, the IHDS Cu-2wt%Ag alloy is composed of columnar grains and equiaxed grains and the number of grains increases. Meanwhile, the growth direction of columnar grains in the edge of alloys deviates from the direction of continuous casting to form “V” shape. While the mold temperature is controlled at high temperature, the induced current increases, which leads to the enhancement of eddy current in the mold. Therefore, the dendrites fall off to form new grains under the effect of eddy stirring, resulting in an increasing in the number of grains.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 113-117
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication And Properties Of Silver Based Multiwall Carbon Nanotube Composite Prepared By Spark Plasma Sintering Method
Wytwarzanie i właściwości kompozytu na bazie srebra z dodatkiem nanorurek węglowych otrzymanego metodą SPS
Autorzy:
Lis, M.
Wrona, A.
Mazur, J.
Dupont, C.
Kamińska, M.
Kopyto, D.
Kwarciński, M.
Powiązania:
https://bibliotekanauki.pl/articles/352182.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spark plasma sintering
composites
Ag-carbon nanotubes
dispersion
microstructure
spiekanie plazmowe
SPS
kompozyty
nanorurki węglowe
dyspersja
mikrostruktura
Opis:
The paper presents results of investigations of the obtained nanocomposite materials based on silver with addition of multiwall carbon nanotubes. The powder of carbon nanotubes content from 0.1 to 3 wt. % was produced by application of powder metallurgy methods, through mixing and high-energetic milling, and also chemical methods. Modification of carbon nanotubes included electroless deposition of silver particles on the carbon nanotube active surfaces and chemical reduction with strong reducing agent – sodium borohydride (NaBH4). The obtained powder mixtures were consolidated by SPS – Spark Plasma Sintering method. The formed composites were subjected to tests of relative density, electrical conductivity and electro-erosion properties. Detailed examinations of the structure with application of X-ray microanalysis, with consideration of carbon nanotubes distribution, were also carried out. The effect of manufacturing methods on properties of the obtained composites was observed.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1351-1355
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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