Temat: powder - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Kinetic, isotherm and thermodynamics investigation on adsorption of divalent copper using agro-waste biomaterials, Musa acuminata, Casuarina equisetifolia L. and Sorghum bicolor
Autorzy:: Mokkapati, R.P.
Mokkapati, J.
Ratnakaram, V.N.
Tematy:: banana bunch-stem powder
casuarinas fruit powder
sorghum stem powder
removal
copper
adsorption; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778519.pdf Link otwiera się w nowym oknie
Opis:: Three novel and distinct agricultural waste materials, viz., Casuarinas fruit powder (CFP), sorghum stem powder (SSP) and banana stem powder (BSP) were used as low cost adsorbents for the removal of toxic copper(II) from aqueous solutions. Acid treated adsorbents were characterized by SEM, EDX and FTIR. Different factors effecting adsorption capacity were analyzed and the efficiency order was BSP>SSP>CFP. Based on the extent of compatibility to Freundlich/Langmuir/D-R/Temkin adsorption isotherm and different models (pseudo-first and second order, Boyd, Weber’s and Elovich), chemisorption primarily involved in the case of CFP and SSP, whereas, simultaneous occurrence of chemisorption and physisorption was proposed in the case of BSP. Based on the observations, it was proposed that three kinetic stages involve in adsorption process viz., diffusion of sorbate to sorbent, intra particle diffusion and then establishment of equilibrium. These adsorbents have promising role towards removal of Cu(II) from industrial wastewater to contribute environmental protection.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Effect of Gas Pressure on Powder Size and Morphology in The Production of AZ91 Powder by Gas Atomization Method
Autorzy:: Akkaş, M.
Çetin, T.
Boz, M.
Tematy:: gas atomization
AZ91 alloy powder
gas pressure
powder morphology; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351517.pdf Link otwiera się w nowym oknie
Opis:: In this study, the effect of gas pressure on the shape and size of the AZ91 alloy powder produced by using the gas atomization method was investigated experimentally. Experiments were carried out at 820°C constant temperature in 2-mm nozzle diameter and by applying 4 different gas pressures (0.5, 1.5, 2.5 and 3.5 MPa). Argon gas was used to atomize the melt. Scanning electron microscope (SEM) to determine the shape of produced AZ91 powders, XRD, XRF and SEM-EDX analysis to determine the phases forming in the internal structures of the produced powders and the percentages of these phases and a laser measuring device for powder size analysis were used. Hardness tests were carried out to determine the mechanical properties of the produced powders. The general appearances of AZ91 alloy powders produced had general appearances of ligament, acicular, droplet, flake and spherical shape, but depending on the increase in gas pressure, the shape of the powders is seen to change mostly towards flake and spherical. It is determined that the finest powder was obtained at 820°C with 2 mm nozzle diameter at 3.5 MPa gas pressure and the powders had complex shapes in general.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wpływ przechowywania na oksydację lipidów w mieszance mleka i jaja w proszku
Effects of storage on lipid oxidation in milk and egg mixed powder
Autorzy:: Chudy, Sylwia
Pikul, Jan
Rudzińska, Magdalena
Wydawca:: Science and Education Publishing Co. Ltd
Cytata wydawnicza:: SYLWIA CHUDY – JAN PIKUL – MAGDALENA RUDZIŃSKA, (2015). Effects of storage on lipid oxidation in milk and egg mixed powder. Journal of Food and Nutrition Research. Vol. 54, No. 1, pp. 31–40
Opis:: Sylwia Chudy
The aim of this study was to determine the effect of the duration of vacuum storage on oxidation of cholesterol and fatty acids, as well as on sensory properties of dried milk and egg mixed powder in comparison with whole milk powder and egg powder. Determination of the contents of fat and water, peroxide value and sensory evaluation were done according to American Oil Chemists’ Society and ISO official methods. The application of vacuum packaging did not protect powders against progressing changes in lipids. Composition of the powders determined their oxidation stability and formation of oxycholesterols, hydroperoxides, the value of the browning index, as well as sensory properties. After production and during storage of mixed powders, the evaluated indeces had values between those recorded for milk powder and egg powder. On the basis of these findings, it can be concluded that the analysed milk-egg powder retained its good sensory attributes up to the 12th month of storage in spite of physical and chemical changes taking place.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 4.

Tytuł:: 3D Model Studies on the Effect of Bed and Powder Type Upon Radial Static Pressure and Powder Distribution in Metallurgical Shaft Furnaces
Autorzy:: Panic, B.
Tematy:: blast furnace
system descending packed bed–gas-powder
pressure
holdup powder; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351694.pdf Link otwiera się w nowym oknie
Opis:: The flow of gases in metallurgical shaft furnaces has a decisive influence on the course and process efficiency. Radial changes in porosity of the bed cause uneven flow of gas along the radius of the reactor, which sometimes is deliberate and intentional. However, holdup of solid particles in descending packed beds of metallurgical shaft furnaces can lead to unintentional changes in porosity of the bed along the radial reactor. Unintentional changes in porosity often disrupt the flow of gas causing poor performance of the furnace. Such disruptions of flow may occur in the blast furnace due to high level of powder content in gas caused by large amount of coal dust/powder insufflated as fuel substitute. The paper describes the model test results of radial distribution of static pressure and powder hold up within metallurgical reactor. The measurements were carried out with the use of 3D physical model of two-phase flow gas-powder in the moving (descending) packed bed. Sinter or blast furnace pellets were used as packed bed while carbon powder or iron powder were used as the powder. Wide diversity within both static pressure distribution and powder distribution along the radius of the reactor were observed once the change in the type of powder occurred.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Autonomous off-line robot programming for powder suction operation with PythonOCC
Autorzy:: Bagherzadeh, Faramarz
Tematy:: OpenCasCade
PythonOCC
off-line robot programming
powder bed printer
powder suction; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99857.pdf Link otwiera się w nowym oknie
Opis:: While a powder bed 3D printer device is easy to use, the cleaning task after each print is a tedious job. Consequently, a proper approach is to employ an industrial robot for this task. The robot should be programmed quickly and efficiently with the off-line robot programming (OLP) method. In this paper, an OLP system based on Python and OpenCasCade libraries is introduced to generate robot trajectories for cleaning the printer powder bed immediately and autonomously. The cleaning operation is divided into three sub-operations: top layer raster, raster from the offset, and offset oriented. Several algorithms are employed to satisfy sub-operations autonomously from a CAD model. Raster path, wire, and yaw angle calculators are essential algorithms. Finally, a graphical simulation illustrates the operation efficiency. The proposed system can generate a cleaning path immediately and due to utilizing open resource libraries, there is a wide range of applicable personalization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Napawanie elementów spiekanych
Hardfacing of sintered parts
Autorzy:: Kozub, B.
Tematy:: Powder metallurgy
hardfacing
regeneration of surface
MSP powder
molybdenum addition; Pokaż więcej
Wydawca:: ADVSEO
Powiązania:: https://bibliotekanauki.pl/articles/134756.pdf Link otwiera się w nowym oknie
Opis:: Hardfacing (weld surfacing) is one of the methods commonly used for the repair and regeneration of machine parts. It allows, like other welding recovery methods, to repair the damaged part surface in a relatively short time and at low cost. For the purpose of this paper it was attempted to hardface the sintered material made of iron-based MSP powder. The performed tests included microhardness and microstructure analysis of the base and weld material depending on the content of molybdenum in the base material (1.5%, 3.5% and 4 wt.%). Cylindrical samples were uniaxially pressed with pressure of 600 MPa. Sintering process was performed at 1250 °C under pure hydrogen atmosphere. Weld surfacing was performed with MAG (Metal Active Gas) method under gas mixture of argon + CO2, using chromium-molybdenum welding wire.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Effect of Particle Size of a Powder upon the Properties and Microstructure of Boron-modified Fe-Ni-Mo-Cu Sinters
Autorzy:: Karwan-Baczewska, Joanna
Perek-Nowak, Małgorzata
Majchrowska, Magdalena
Rosso, Mario
Tematy:: processing
powder metallurgy
Distaloy SA powder
activated sintering
particle fraction; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/2201983.pdf Link otwiera się w nowym oknie
Opis:: The article discusses the effect of different particle fractions of prealloyed iron powder on the microstructure, density and hardness of sintered material. Each particle fraction (apart from 160–200 µm, which is a trace fraction) was modified with boron, its contents being, respectively, 0.2 wt.%, 0.4 wt.% and 0.6 wt.%. Next, the powder mixtures were pressed under a pressure of 600 MPa, and the final compacts were subject to sintering at 1200°C for 60 min in a hydrogen atmosphere. It was observed that the higher values of density and hardness were found in samples made from finer fractions of powder. A higher homogeneity of the microstructure and the highest degree of compactness was obtained in sinters from powder of 40–56 µm particle size, with 0.4 wt.% boron. Due to the use of small particle fractions of prealloyed powder, a higher degree of compactness in sinters was obtained with lower boron content. Also indicated was which particle fraction of Fe-Ni-Mo-Cu powder should be applied to obtain density in sinters with boron addition equal to almost 100% of the relative density of the analyzed alloy. The presented studies have both scientific and technological aspects.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Carbon Co-Deposition During Gas Reduction of Water-Atomized Fe-Cr-Mo Powder
Autorzy:: Ali, B.
Choi, S. H.
Seo, S. J.
Maeng, D. Y.
Lee, C. G.
Kim, T. S.
Park, K. T.
Tematy:: water atomization
Fe-based powder
oxide reduction
powder metallurgy
sinter-hardening alloys; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352709.pdf Link otwiera się w nowym oknie
Opis:: The water atomization of iron powder with a composition of Fe-3Cr-0.5Mo (wt.%) at 1600°C and 150 bar creates an oxide layer, which in this study was reduced using a mixture of methane (CH₄) and argon (Ar) gas. The lowest oxygen content was achieved with a 100 cc/min flow rate of CH₄, but this also resulted in a co-deposition of carbon due to the cracking of CH₄. This carbon can be used directly to create high-quality, sinter hardenable steel, thereby eliminating the need for an additional mixing step prior to sintering. An exponential relationship was found to exist between the CH₄ gas flow rate and carbon content of the powder, meaning that its composition can be easily controlled to suit a variety of different applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Niestabilność ruchu proszku w bębnie obrotowym jako miara jego zdolności płynięcia
Instability in movement of the powder in the rotational drum as a measure of its flowability
Autorzy:: Zander, Z.
Warechowski, J.
Zander, L.
Tematy:: proszek
zdolność płynięcia
sypkość
chaos
powder
flowability
flow rate of powder; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Rolniczej
Powiązania:: https://bibliotekanauki.pl/articles/287202.pdf Link otwiera się w nowym oknie
Opis:: Analizowano zachowanie się swobodnego złoża proszku w zamkniętym, wolno obracającym się poziomym bębnie pomiarowym. Zmiany wysokości złoża w płaszczyźnie osi obrotu interpretowano w oparciu o metody opisu zjawisk chaotycznych. Stwierdzono, że podczas obrotu bębna następowało osypywanie się (lawinowanie) złoża, którego częstotliwość i amplituda zależała od rodzaju materiału.
The behaviour of the free powder bed in a closed, slowly rotating horizontal measuring drum was subject to analysis. Changes in the height of the bed in the plane of rotation were interpreted by methods describing the chaotic phenomena. It was found that while the drum was rotating, the bed was sliding (avalanching) with the frequency and amplitude depending on a type of material.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A Study on Pore Properties of Hastelloy Powder Porous Metal Fabricated by Electrostatic Powder Coating
Autorzy:: Lee, Min-Jeong
Yi, Yu-Jeong
Kim, Hyeon-Ju
Park, Man-Ho
Kim, Byoung-Kee
Yun, Jung-Yeul
Tematy:: electrostatic powder coating
Hastelloy
porous metal
pore properties
powder coating amount; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/353929.pdf Link otwiera się w nowym oknie
Opis:: Porous metals show not only extremely low density, but also excellent physical, mechanical and acoustic properties. In this study, Hastelloy powders prepared by gas atomization are used to manufacture 3D geometries of Hastelloy porous metal with above 90% porosity using electrostatic powder coating process. In order to control pore size and porosity, foam is sintered at 1200~1300°C and different powder coating amount. The pore properties are evaluated using SEM and Archimedes method. As powder coating amount and sintering temperature increased, porosity is decreased from 96.4 to 94.4%. And foam density is increased from 0.323 to 0.497 g/cm³ and pore size is decreased from 98 to 560 μm. When the sintering temperature is increased, foam thickness and strut thickness are decreased from 9.85 to 8.13 mm and from 366 to 292 μm.
Dostawca treści:: Biblioteka Nauki

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