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Tytuł:
Effect of Atmospheric-Pressure Gas-Plasma Treatment on Surface Properties of Hot-Dip Zn-Mg-Al Alloy-Coated Steel
Autorzy:
Jeong, Chang-U
Kim, Jae-Hyeon
Park, Je-Shin
Kim, Min-Su
Kim, Sung-Jin
Oh, Min-Suk
Powiązania:
https://bibliotekanauki.pl/articles/2203736.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma treatment
Zn-Mg-Al-galvanized steel
surface energy
process gas
Opis:
The effect of plasma-radical change on the surface properties of Zn-Mg-Al ternary-alloy-coated steel sheets during atmospheric-pressure (AP) plasma treatment using different process gases: O2, N2, and compressed air was investigated. The plasma-induced radicals promoted the formation of chemical particles on the surface of the Zn-Mg-Al coating, thereby increasing the surface roughness. The surface energy was calculated using the Owen-Wendt geometric equation. Contact angle measurements indicated that the surface free energy of the alloy sheets increased upon AP plasma treatment. The surface properties of the Zn-Mg-Al coating changed more significantly in the order air > O2 > N2 gas, indicating that the plasma radicals facilitated the carbonization and hydroxylation of the Mg and Al components during the AP plasma treatment.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 187--190
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Operating Conditions on the Tribological Behavior of Zn-30Al-3Cu Bearing Alloy
Autorzy:
Savaşkan, Temel
Tan, Hasan Onur
Powiązania:
https://bibliotekanauki.pl/articles/27765066.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Zn-30Al-3Cu alloy
sliding friction
lubricated wear
running condition-wear property relationship
Opis:
To determine the relationships between operating conditions and tribological properties of Zn-30Al-3Cu alloy, its wear characteristics were investigated at wide ranges of oil flow rate, pressure and sliding velocity using a block-on-disk type test apparatus. The results are compared to those of SAE 660 leaded bearing bronze. Wear loss of these materials increased with sliding distance, pressure and sliding velocity, but decreased slightly with oil flow rate. The relationships between operating conditions and lubricated wear properties of Zn-30Al-3Cu alloy were determined by nonlinear regression analysis of the experimental data. Lubricated wear behavior of the zinc-based alloy was discussed in terms its microstructure and mechanical properties, and test conditions.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 607--616
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of fly ash on the stabilization/solidification of Zn-contaminated soil
Autorzy:
Chen, Yan
Zhu, Shengyuan
Fang, Wei
Huang, He
Qin, Hao
Hu, Shengtao
Wu, Yuzhao
Powiązania:
https://bibliotekanauki.pl/articles/27323977.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fly ash
soil
heavy metals
X-ray diffraction
Zn2+
popiół lotny
gleba
metale ciężkie
dyfrakcja rentgenowska
Opis:
As a solid waste, the associated disposal cost of fly ash is really high. Previous studies suggested that the utilization of fly ash to treat heavy metal-contaminated soils was a new cost-effective method of disposal of it. Therefore, the effectiveness of fly ash stabilized/solidified Zn-contaminated soils has been investigated by unconfined compressive strength (UCS) and toxicity characteristics leaching procedure (TCLP) tests. Quantitative analysis of the soil microstructure was conducted by processing the X-ray diffraction (XRD) and scanning electron microscope (SEM) images. Mercury intrusion porosimetry (MIP) was carried out to illustrate the size and proportion of pore size for specimens under different ratios. The results of the tests showed an improvement in the UCS, which further increased as the content of binders was raised. Binder content would have little influence on the development of strength if the binder content exceeds a threshold value. The leached Zn2+ concentration of stabilized specimens was significantly decreased compared to that of untreated. Quantitative analysis confirmed that the addition of the binders resulted in the amount of hydration product, reduction of porosity, and a really random pores orientation, which was responsible for the improvement of the strength and leaching properties of the Zn2+ contaminated soils.
Źródło:
Environment Protection Engineering; 2023, 49, 3; 15--29
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indium-gallium-zinc oxide thin-film preparation via single-step radio frequency sputter deposition using mixed-oxide powder targets
Autorzy:
Satake, Takahiko
Kawasaki, Hiroharu
Aoqiu, Shin-Ichi
Powiązania:
https://bibliotekanauki.pl/articles/24202734.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
In–Ga–Zn–O thin-film
plasma processes
powder target
sputtering deposition
transparent conductive film
Opis:
Indium gallium zinc oxide (In–Ga–Zn–O) thin films, which are transparent conductive films for liquid crystals and electroluminescent displays, were fabricated via singlestep sputter deposition using one target containing different proportions of indium oxide, gallium oxide, and zinc oxide powders. Experimental results suggest that the In–Ga–Zn–O thin films can be prepared using the method of single-step radio frequency (RF) sputter deposition, applying a powder target containing indium oxide, gallium oxide, and zinc oxide. The In–Ga–Zn–O thin films were prepared on Si substrates, and the deposition rate depended on the target composition. In these plasma processes, electron density and temperature were essentially independent of target composition. The prepared films were very smooth with a root-mean-square roughness of less than 10 nm. The crystallinity of the ZnO peak was observed in all the films; whereas the In and Ga peaks were not observed in the films prepared. The X-ray photoelectron spectroscopy of the films also revealed that the elemental concentration ratio of In–Ga–Zn–O thin films could be prepared using one target, and that can be easily controlled by ratios in the In2O3/Ga2O3/ZnO composition in the powder target. The transmittances were > 75% at 800 nm for all the target mixtures, and increased with increasing In2O3 in the powder target.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 555--563
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Gray Forest Soil Moisture Level on the Accumulation of Pb, Cd, Zn, Cu in Spring Barley Grain
Autorzy:
Razanov, Serhii
Husak, Oksana
Hnativ, Petro
Dydiv, Andrii
Bakhmat, Oleh
Stepanchenko, Vitalii
Pryshchepa, Alla
Shcherbachuk, Victor
Mazurak, Oksana
Powiązania:
https://bibliotekanauki.pl/articles/27323825.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil
heavy metals
Pb
lead
Cd
cadmium
Zn
zinc
Cu
copper
spring barley
accumulation coefficient
concentration
precipitation
artificial moistening
growing season
germination
earing
Opis:
Among a number of climate-related factors, moisture has the greatest impact on crop productivity. In recent years, certain changes have been observed under conditions of the Forest-Steppe of Ukraine with regard to precipitation – from low to in some cases – abnormally high, which requires the study of their impact on the yield and safety of cereal grain for its forecasted production. The article examined the effect of a high level of soil moisture (256.2–272.5 mm) and a low level (47.4–52.3 mm) during the growing season (germination→earing) of spring barley grain on the accumulation of heavy metals in it and its productivity under the conditions of gray forest soils of the Right Bank Forest Steppe of Ukraine. Spring barley varieties Helios and Caesar were selected for the research. A decrease in the accumulation coefficient at a high level of soil moisture (256.6–272.5 mm) in spring barley grain Pb from 8.3% to 11.3%, Cd – from 35.0% to 35.5%, Zn was established – by 15% and Cu – from 11.2% to 16.6% compared to the low level of soil moisture (47.1 mm – 53.3 mm). At the same time, it was found that with a high level of soil moisture, there is a decrease in the yield of Helios and Caesar spring barley by 18.0% and 14.1%, respectively.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 285--292
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The need and advantages to intensify exploratory and evaluative works on the areas of undeveloped zinc and lead ores’ deposits of the Silesian and Cracovian region
Autorzy:
Grelewicz-Kowalczyk, Martyna
Kaczmarczyk, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/27315556.pdf
Data publikacji:
2023
Wydawca:
STE GROUP
Tematy:
Zn-Pb ores
Zawiercie region
exploratory and/or evaluative works
raw materials safety
Opis:
Zinc and lead metal ores are minerals intended for strategically producing raw materials for the Polish economy, as indicated in the key Polish document: State Raw Materials Policy (PSP2050). It was specified among others that an important factor that will influence the development of Polish economy will be the access to key mineral raw materials from domestic resources. Currently Polish Zn-Pb ores mining no longer exists as the last operating mine Olkusz-Pomorzany that belonged to the Mining and Metallurgic Plant “Bolesław” Joint Stock Company due to the depletion of resources finished extraction in 2020. Despite this fact there still are areas of great potential in the scope of these minerals in Poland. It is the Zawiercie region, where there has been no extraction of these ores so far and is believed to have the best perspectives for future development. One should connect with this region the nearest future of functioning of the domestic Zn-Pb ores’ mining. It is in this region that the “Zawiercie 3” ore is situated. The ore was documented in 2014 by a private investor within the framework of the permit to search for and identify Zn-Pb ore deposits and it is currently the largest as to resources Zn-Pb ores’ deposit in Poland. Its resources are currently over 35 million tonnes, which constitutes app. 39% of all the documented balance sheet resources of Zn-Pb ores in Poland. The presented geological works performed by the private investor on the area of the “Zawiercie 3” ore and the results that were achieved thanks to them clearly indicate that well-designed and thoroughly performed exploratory and evaluative works that combine international standards and Polish guidelines can significantly influence the degree of documentation and the increase of resources in undeveloped Zn-Pb ores’ deposits.
Źródło:
Management Systems in Production Engineering; 2023, 3 (31); 343--354
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Česká i-kmenová feminina na -n a jejich vývoj ve starší češtině (od r. 1300 do r. 1900)
Czech i-Stem Feminine Nouns Ending in -n and Their Development in Older Czech (from 1300 to 1900)
Czeskie rzeczowniki żeńskie z tematem -i zakończone na -n i ich rozwój w starszych okresach rozwoju języka czeskiego (1300–1900)
Autorzy:
Vajdlová, Miloslava
Powiązania:
https://bibliotekanauki.pl/articles/38697967.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
i-stem feminine nouns ending in -n
Proto-Slavic suffixes *-snь
*-znь
*-nь
suffix -(e)ň
word formation
deverbal nouns
denominatives
Old Czech period
Middle Czech period
Czech in the period 1775–1900
development of language
Opis:
In this paper we follow both the functional and formal development of word-formative formants *-snь, *-znь, *-nь during the Old and Middle Czech periods and during the period of the National Revival and afterwards, and the word-formative and formal development of Czech i-stem feminines with the component -n- during the same period. These nouns are formed by derivation using the suffixes mentioned above or by conversion using the grammatical formant *-ь, and, after the disappearance of the softness correlation, they identically end in the form of direct singular cases on the -n nasal. In order to eliminate alternations of the morphological base, they change their ending in these forms from -(e)n to -(e)ň during their development. As a result, in the later developmental stages of the language, they converge formally to the Old Czech ja-stem feminines originally ending in -ně or -ně/-eň, which also changed their forms nom./acc. sg. in favour of the ending -eň during the development. At the same time, the no longer productive suffixes -n, -ně (in Proto-Slavic *-nьja) and partly also -sn, -zn (Modern Czech -seň, -zeň) merge into a new, self-applying suffix -(e)ň.
Niniejszy artykuł pokazuje zarówno funkcjonalny i formalny rozwój formantów słowotwórczych *-snь, *-znь, *-nь w okresie staro- i średnioczeskim oraz w okresie odrodzenia narodowego i poodrodzeniowym, jak również słowotwórczy i formalny rozwój czeskich rzeczowników żeńskich z tematem -i z komponentem -n- w tym czasie. Analizowane rzeczowniki są tworzone przez derywację za pomocą wymienionych sufiksów lub przez konwersję za pomocą formantu gramatycznego *-ь, a po zaniku miękkości w przypadkach niewymagających przyimka kończą się w liczbie pojedynczej spółgłoską nosową -n. W toku dalszego rozwoju, w celu wyeliminowania zmienności podstawy morfologicznej zmieniają swoje zakończenie w tych formach z -(e)n na -(e)ň. W rezultacie na późniejszych etapach rozwoju języka zbiegają się one formalnie ze staroczeskim tematem -ja rzeczowników żeńskich zakończonych pierwotnie na -ně lub -ně/-eň, które również zmieniły formy w mianowniku/bierniku liczby pojedynczej na końcówkę -eň. Jednocześnie nieproduktywne już sufiksy -n, -ně (prasłowiańskie *-nьja) i częściowo także -sn, -zn (współczesne czeskie -seň, -zeň) łączą się w nowy sufiks -(e)ň.
Źródło:
Studia z Filologii Polskiej i Słowiańskiej; 2022, 57
0081-7090
2392-2435
Pojawia się w:
Studia z Filologii Polskiej i Słowiańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Tin Addition on the Degradability and Corrosion Properties of a New Zn-1.0 wt.% Mg Alloy
Autorzy:
Long, Zhouling
Lang, Haiyang
Ou, Jun
Powiązania:
https://bibliotekanauki.pl/articles/2174586.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zn-1Mg alloy
mechanical properties
corrosion properties
degradability
hemolysis rate
Opis:
In this study, to investigate effects of tin addition on the microstructures and corrosion properties, Zn-1Mg-xSn (x = 1.0, 2.0 and 5.0 wt.%) ternary zinc alloys were prepared. The experimental results indicated that the Zn-1Mg-2.0 wt.% Sn alloy has the better mechanical properties compared with pure zinc and Zn-1Mg alloy. The tensile strength of the alloy material is 173.2±3.7 MPa, the yield strength is 120.7±2.4 MPa, the elongation is 5.64±0.08% and the hardness is 76.9±0.8 HV. The average degradation rate of the alloys immersion in SBF solution for 60 days is 0.16±0.03 mm/year, and the Zn-1Mg-2.0 wt.% Sn alloy hemolysis rate is only 0.81±0.02%. It is confirmed that the addition of tin is effective to improve the mechanical properties and degradation of Zn-1Mg alloy. It may be a candidate of the clinical application requirements of the degradable implant materials in orthopedics.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1209--1216
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing the Strength of Al/Mg Dissimilar Friction Stir Lap Welded Joint by Zn Filler Addition Combined with an Appropriate Heat Input
Autorzy:
Zhao, Huaxia
Gong, Peng
Ji, Shude
Gong, Xue
Powiązania:
https://bibliotekanauki.pl/articles/2048795.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir lap welding
Al/Mg dissimilar alloys
Zn filler
heat input
tensile shear load
Opis:
7075-T6 Al and AZ31B Mg dissimilar alloys were friction stir lap welded with or without a Zn filler, and the effect of heat input on the joint quality was systematically studied. The experimental and finite element simulation results displayed that the formation characteristics and microstructures of the joint with or without the Zn filler were significantly affected by the heat input. The tensile shear load of joint with or without the Zn filler increased first and then decreased with the decrease of the welding speed from 200 to 50 mm/min. Moreover, the peak temperature in the stir zone was significantly decreased by the Zn filler addition, and the high temperature zone narrowed along the plate thickness direction. These changes of heat input made that longer mixing region boundary length and larger effective lap width were attained as the Zn filler was used. In addition, due to the replacement of Al-Mg intermetallic compounds (IMCs) by Al-Mg-Zn and Mg-Zn IMCs which were less harmful to the joint, the tensile shear load of the joint with the Zn filler was obviously enhanced compared to that of the joint without the Zn filler at each welding speed. The maximum tensile shear load of 7.2 kN was obtained at the welding speed of 100 mm/min.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 137-146
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iron, Zinc, Copper, Manganese and Chromium in Green Teas, Their Transfer to Extracts and Correlations between Contents of Elements and Bioactive Compounds
Autorzy:
Herman, Małgorzata
Janiak, Michał A.
Sadlik, Józefa K.
Piekoszewski, Wojciech
Amarowicz, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2152159.pdf
Data publikacji:
2022-11-22
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
green tea
extracts
Cu
Fe
Zn
Mn
Cr
Opis:
Green tea is used worldwide in the preparation of beverages, but also its extracts rich in bioactive compounds, especially flavan-3-ols, are of increasing interest. In addition to bioactive molecules, green tea represents a source of dietary elements. However, knowledge about their content in extracts is limited. The aim of our research was to determine the extent of transfer of selected elements, i.e., iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), and chromium (Cr), from green teas to their extracts and to investigate whether the main bioactive compounds of the extracts affect this transfer. Twelve commercially available green teas were used in the study. The contents of elements in green teas and their extracts obtained with 80% acetone (v/v) were analysed by inductively coupled plasma optical emission spectroscopy (ICP-OES). High performance liquid chromatography in reverse phase (RP-HPLC) was used to determine contents of caffeine, (–)-epigallocatechin (EGC), (–)-epicatechin (EP), (–)-epigallocatechin gallate (EGCG), and (–)-epicatechin gallate (ECG). The element with the highest content in green teas was Mn (711–1402 µg/g), but its transfer to extracts was the lowest (0.269–0.646%). The mean Fe transfer, second abundant element in teas (115–725 µg/g), was 5.52%. The contents of Mn and Fe in extracts were 5.08–30.2 and 10.7–90.1 µg/g, respectively. Zn, Cu, and Cr were transferred with means of 10.4, 20.0, and 26.2%, respectively, which resulted in their contents in the extracts in the ranges of 5.03–12.6, 1.93–13.8, and 0.128–2.03 µg/g, respectively. The significant positive correlations of Zn content in extracts and/or transfer to extracts with EGCG, EGC and total flavan-3-ols as well as between the same Fe variables and EGC were determined, which suggested that these flavan-3-ols may positively affect the transfer of Fe and Zn from green tea to extracts. In turn, significant but negative correlations were found in the case of Mn and Cu. Future research is needed to identify the causes of the various transfer rate of elements from green teas to extracts.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 4; 421-429
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The environmental fate of metals from zinc and lead mining area in surface water (Przemsza River, southern Poland)
Autorzy:
Pierri, Dorota
Rutkowski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2172911.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Zn-Pb ore
Upper Silesia region
Przemsza River
metals pollution
thallium
cadmium
mercury
Opis:
The chemical composition of surface waters of the Przemsza River flowing through Upper Silesia (in southern Poland) is strongly affected by Zn and Pb ore, and less by Carboniferous hard coal deposits. The chemical type of surface water is Ca-HCO3. In the waters, three groups of metals and metalloids were found that directly interfere with the mineralization of the deposit. Although genetically related to the same deposit, each group exhibits a different fate in the environment. A typical deposit association is Pb-Zn-Ag-As-Sb-Hg. The first group of metals in surface waters is consistent with the typical association of the ore Zn-Pb-Cd-(Tl), the second includes Ag-Sb-Hg, and the third includes the additives in the zinc and lead ore Co-Ni-Mo-Mn: [formula]. Depending on the pH-Eh conditions, metals and metalloids precipitate out of the solution or sorb on solid particles. The concentrations of individual groups of metals are interdependent but show different environmental fates along the river course. The natural process of the enrichment of surface waters with Zn-Pb-Cd-(Tl) is by water circulation in a rock matrix naturally rich in the metals and draining groundwaters by the river. Under oxidizing and slightly alkaline conditions, Ag-Sb-Hg incorporated into the soluted chemical compounds, may, when the physicochemical parameters of the waters change, be adsorbed and/or precipitated. The presence and ratio of concentrations of Co-Ni-Mo-Mn with respect to zinc are almost identical, differing only in concentration.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 4; 353--366
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the Surface Roughness of Galvannealed Low Carbon Al-Killed and Ti-Nb Stabilized Interstitial Free Steels
Autorzy:
Elkoca, Sen Candan
Ekmekci, Bulent
Elkoca, Oktay
Powiązania:
https://bibliotekanauki.pl/articles/2049358.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
galvannealing
galvannealed steel
hot-dip galvanizing
Fe-Zn phases
surface roughness
Opis:
In this study, the surface roughness of galvannealed low carbon Al-killed and Ti-Nb stabilized interstitial free steels was investigated using the industrial galvannealing process parameters. The iron content of the coatings was also analysed to establish a relationship with the surface roughness and coating composition. The surface roughness displayed an exponential behaviour with increasing of annealing time at each annealing temperature in both steel coatings, which was in an increasing order in the galvannealed low carbon Al-killed steel coating, whereas it was a reverse order in the galvannealed Ti-Nb stabilized interstitial free steel coating. The craters were observed on the galvannealed coatings resulting in high surface roughness. Increasing the iron content of the coatings leads to a reduction in the surface roughness with δ1k phase.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 841-857
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Fe-Mn Solid Solution Precursor Addition on Modified AA 7075
Autorzy:
Kim, Min Sang
Kim, Dae Young
Kim, Young Do
Choi, Hyun Joo
Kim, Se Hoon
Powiązania:
https://bibliotekanauki.pl/articles/2049310.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Zn-Mg alloy
solid solution precursor
mechanical properties
Opis:
This study suggests a new way to modify the size and morphology of Al-Fe phases in modified AA 7075 by using an Fe-Mn solid solution powder as the precursor. When Fe and Mn are added in the form of a solid solution, the diffusion of Fe and Mn toward the Al is delayed, thus altering the chemical composition and morphology of the precipitates. The fine, spherical precipitates are found to provide a good balance between strength and ductility compared to the case where Fe and Mn are separately added.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 783-787
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Power of Various Types of Induction Furnaces on the Shape of the Metal Bath Surface
Autorzy:
Smalcerz, Albert
Węcki, Bartosz
Blacha, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/2123294.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
induction vacuum furnace
Al-Zn alloys
cold crucible furnace
metal bath surface
Opis:
The work shows the results of examinations conducted to ascertain the influence of the working power of a vacuum induction crucible furnace (ICF) and a furnace with a cold crucible(CCF), on the surface area of liquid Al-Zn alloy molten within these devices. It was determined that the increase of the value of this parameter causes the increase of the liquid alloys surface area. In the case of smelting alloy inside a crucible furnace the increase of power from 8 to 22 kW causes the increase of liquid alloy surface from 88 to 155 cm2. For a furnace with a cold crucible, the power increase from 70 to 130 kW causes the increase of the alloy surface from 280 to 330,3 cm2. For all power values a larger increase in surface area was observed in crucible furnaces (around two times). In cases of cold crucible furnaces, this increase was around 20%. Additionally, based on the examination results the way in which the surface area of liquid alloy can intensify the undesirable process of zinc fuming away, was discussed. It has been demonstrated that the process of zinc elimination from the examined alloy is more intensive while using a cold crucible induction furnace.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 34--42
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogical and Geochemical Characteristics of Lead-zinc Ore Deposits, and Potential Accompanying Components in the Cho Don - Cho Dien Area, Bac Kan Province, Vietnam
Autorzy:
Nguyen, Tien Dung
Nguyen, Khac Du
Nguyen, Ngoc Thom
Powiązania:
https://bibliotekanauki.pl/articles/2020105.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
Cho Don-Cho Dien Pb-Zn ore deposits
mineralogy and geochemistry
accompanying components
by-products
złoża rud
mineralogia
geochemia
Opis:
The Pb-Zn mineralization in the Cho Don - Cho Dien ore districts often occurs in 2 types: (1) oxidized ore near to the surface and (2) sulfide ore at deeper section. Based on microscopic observations, sulfide ores can be divided into sphalerite-galena-pyrite and/or galena-sphalerite mineralization types. To examine the geochemical features of the Pb-Zn ores, SEM-EDX and ICP-MS analytical methods were performed in this study. Previous δ34S data of Pb-Zn concentrates, and sulfide minerals from various deposits suggest that the Pb-Zn ore-forming fluids might be related to the felsic-granitic magmatic activities rather than a genesis of stratiform type. Geochemical data show that the major, minor, and trace element compositions of lead-zinc ores have wide ranges of variation even in each deposit. The sulfide ores are generally higher in economic components than those in the oxidized ores. The positive correlations between Pb-Ag can be found in the entire dataset, whereas excellent Zn-Cd correlation can only be observed from Cho Don ore samples. Apart from the principal components (Pb and Zn), the ores also contain other accompanying elements that supply high-technological manufacturing industries. Of which As, Cu, Ag, Sb, and Cd could be potential by-products and can be extracted during smelting Pb/Zn concentrate processes, and need more detailed studies for every deposit.
Źródło:
Inżynieria Mineralna; 2021, 2; 261--273
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 163

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