Temat: sintering process - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Studies on sintering process of synthetic hydroxyapatite
Autorzy:: Malina, Dagmara
Biernat, Kamila
Sobczak-Kupiec, Agnieszka
Tematy:: calcium phosphates
hydroxyapatite
sintering process
wet synthesis; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1039506.pdf Link otwiera się w nowym oknie
Opis:: In this study the effect of sintering process in different temperatures on microstructure and morphological properties of sintered hydroxyapatite (HAp) was investigated. HAp powder was prepared by wet precipitation method from following reagents: Ca(OH)2 + H3PO4 in an alkaline conditions. Thermal analysis (TA), X-Ray diffraction method (XRD), FT-IR spectrometry (FT-IR) and scanning electron microscopy (SEM) were used to elaborate the phase composition and properties of sintered HAp samples and raw HAp powder as well. The total and apparent density and total porosity of sintered compacts, shrinkage and weight loss during the sintering were also measured. The results show that there is a difference in sintering behavior of synthetic hydroxyapatites depending on sintering temperature. The main differences refer to the loss of mass, shrinkage, changes in porosity and density of the investigated materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Evaluation of Classification Possibility of Coke Breeze by Drag Force
Autorzy:: Lee, Ji-A
Jin, Bong-Min
Han, Jeong-Whan
Tematy:: powder processing
sintering process
coke breeze
numerical simulation
drag model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59193950.pdf Link otwiera się w nowym oknie
Opis:: Sintered ore used as blast furnace burden materials is produced by mixing iron ore, coke, and limestone, then burning the coke and sintering the iron ore with the combustion heat. Among the coke charged, A particle size of 0.25 mm or less has an insignificant effect as a heat source and adhere to the surface of other materials to inhibit the reaction between oxygen and raw materials, thereby decreasing the quality of sintered ore. Therefore, to increase combustion efficiency, it is necessary to reduce the ratio of coke breeze in the charged coke. In this study, theoretical calculation, experiment and simulation were conducted to investigate the possibility of size classification by drag force in the process of dropping coke after being transported through a belt conveyor. The height of belt conveyor was at 1m, and velocity of the belt was 1.5, 2.3, and 2.6 m/s, which were considered as experimental variables. After falling, the distribution of coke particle size according to the horizontal travel distance was confirmed, and a fall trajectory prediction formula model was created through the drag model of polydisperse system and compared with the experimental and analysis results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Enhancing SO2 removal efficiency by lime modified with sewage sludge in a novel integrated desulfurization process
Autorzy:: Qin, L.
Han, J.
Chen, W.
Liu, Z.
He, M.
Xing, F.
Tematy:: sewage sludge
steel industry
sintering process
osad ściekowy
przemysł hutniczy
proces spiekania; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/950037.pdf Link otwiera się w nowym oknie
Opis:: In China, the sintering process annually emitted around 1.5 million t SO₂, representing 70% of SO₂ produced from the iron and steel industry. Lime based sorbent was modified with municipal sewage sludge (MSS) and the influence of the modification on the desulfurization efficiency was investigated in a laboratory-scale novel integrated desulfurization (NID) reactor. The properties of modified sorbent were characterized by the Brunauer–Emmett–Teller (BET) analyzer and X-ray fluorescence (XRD) analyzer. BET surface area was increased from 17.48 to 46.68 m²g^–1. when the MSS/lime ratio increased from 0 to 0.08. Ca₄Al₈Si₈O₃₂, Ca_1.5SiO_3.5, Na₂Si₂O₅ and CaSiO₃ found in the modified lime benefited for the increase of the BET surface area and pore volume. The effects of sewage sludge/CaO weight ratio, calcination temperature and hydration time on the desulfurization efficiency were also studied. SO₂ removal efficiency was increased from 88.7% to 97.3% after using the lime modified with sewage sludge.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Evolution of Microstructure and Magneto-structural Properties of Heat Treated Ni-Mn-Sn-In Heusler Alloys Sintered by Vacuum Hot Pressing
Autorzy:: Maziarz, W.
Wójcik, A.
Chulist, R.
Szczerba, M. J.
Kowalczyk, M.
Czaja, P.
Cesari, E.
Dutkiewicz, J.
Tematy:: Ni-Mn-Sn metamagnetic shape memory alloys
sintering process
heat treatment
electron microscopy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/947530.pdf Link otwiera się w nowym oknie
Opis:: In this work, vacuum hot pressed Ni-Mn-Sn-In Heusler alloys with different concentration of In (0, 2 and 4 at.%), were investigated. The magneto-structural behaviour and microstructure dependencies on chemical composition and on heat treatment were examined. It was found that the martensite start transformation temperature increases with growing In content and to a lesser extent with increasing temperature of heat treatment. The high energy X-ray synchrotron radiation results, demonstrated that both chemical composition as well as temperature of heat treatment slightly modified the crystal structures of the studied alloys. Microstructural investigation performed by transmission electron microscopy confirmed chemical composition and crystal structure changes in the alloys.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study the Recycling of Red Mud in Iron Ore Sintering Process
Autorzy:: Khalifa, Ahmed Abdelazim
Bazhin, Vladimir Yurievich
Kuskova, Yana Vadimovna
Abdelrahim, Ahmed
Ahmed, Yasser Momtaz Zaki
Tematy:: red mud
utilization
Egypt
iron ore
sintering process
sinter charge mixture
sinter strength
sinter production; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/1838291.pdf Link otwiera się w nowym oknie
Opis:: Red mud (RM), the by-product generated during the alumina extraction process, is considered a valuable secondary raw material, since iron (20–54%) represents its major constituent. Accordingly, the suitability of recycling this RM in the sintering process of Egyptian iron ore was studied. The effect of adding different amounts of RM to the sinter charge mixture (0–10 wt.%) on the sintering process performance as well as the chemical, physical and mechanical properties of the produced sinter was investigated. The results revealed that increasing the amount of red mud in the sinter charge mixture leads to a high improvement in the strength of the produced sinter till reaching a maximum at 7% addition, which deteriorates thereafter. Meanwhile, owing to the fine nature of the red mud, increasing its contents in the sinter charge mixture leads to reduced speed of the sintering process, which consequently affects the productivity at the blast furnace yard. The sinter produced with the addition of 3% red mud shows the highest reducibility. These results indicate the suitability of recycling RM in the Egyptian iron ore sintering process with an amount not higher than 3 wt.% of the total sinter mixture charge.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Study the Recycling of Red Mud in Iron Ore Sintering Process
Autorzy:: Khalifa, Ahmed Abdelazim
Bazhin, Vladimir Yurievich
Kuskova, Yana Vadimovna
Abdelrahim, Ahmed
Ahmed, Yasser Momtaz Zaki
Tematy:: red mud
utilization
Egypt
iron ore
sintering process
sinter charge mixture
sinter strength
sinter production; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/1838357.pdf Link otwiera się w nowym oknie
Opis:: Red mud (RM), the by-product generated during the alumina extraction process, is considered a valuable secondary raw material, since iron (20–54%) represents its major constituent. Accordingly, the suitability of recycling this RM in the sintering process of Egyptian iron ore was studied. The effect of adding different amounts of RM to the sinter charge mixture (0–10 wt.%) on the sintering process performance as well as the chemical, physical and mechanical properties of the produced sinter was investigated. The results revealed that increasing the amount of red mud in the sinter charge mixture leads to a high improvement in the strength of the produced sinter till reaching a maximum at 7% addition, which deteriorates thereafter. Meanwhile, owing to the fine nature of the red mud, increasing its contents in the sinter charge mixture leads to reduced speed of the sintering process, which consequently affects the productivity at the blast furnace yard. The sinter produced with the addition of 3% red mud shows the highest reducibility. These results indicate the suitability of recycling RM in the Egyptian iron ore sintering process with an amount not higher than 3 wt.% of the total sinter mixture charge.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Iron-Ore Sintering Process Optimization
Optymalizacja procesu aglomeracji rudy żelaza
Autorzy:: Fröhlichová, M.
Ivanišin, D.
Mašlejová, A.
Findorák, R.
Legemza, J.
Tematy:: iron ore
iron concentrates
sintering process
particulate matter
recycled materials
ruda żelaza
koncentrat żelaza
proces spiekania
pył
materiał surowcowy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351686.pdf Link otwiera się w nowym oknie
Opis:: The work deals with examination of the influence of the ratio between iron ore concentrate and iron ore on quality of produced iron ore sinter. One of the possibilities to increase iron content in sinter is the modification of raw materials ratio, when iron ore materials are added into sintering mixture. If the ratio is in favor of iron ore sinter, iron content in resulting sintering mixture will be lower. If the ratio is in favor of iron ore concentrate and recycled materials, which is more finegrained, a proportion of a fraction under 0.5 mm will increase, charge permeability property will be reduced, sintering band performance will decrease and an occurrence of solid particulate matter in product of sintering process will rise. The sintering mixture permeability can be optimized by increase of fuel content in charge or increase of sinter charge moisture. A change in ratio between concentrate and iron ore has been experimentally studied. An influence of sintering mixture grain size composition, a charge grains shape on quality and phase composition on quality of the produced iron sinter has been studied.
Publikacja dotyczy zagadnienia oceny wpływu proporcji między koncentratem rudy żelaza a rudą żelaza na jakość wyprodukowanego spieku. Jedną z możliwości zwiększenia zawartości żelaza w spieku jest zmiana proporcji materiałów surowcowych, które dodaje się do mieszanki spiekalniczej wraz z materiałami zawierającymi rudę żelaza. Jeśli proporcja ta jest korzystna dla spieku, to będzie to mieć wpływ na mniejszą zawartość rudy żelaza w końcowej mieszance aglomeratu. Jeśli proporcja ta jest korzystna dla drobnoziarnistego koncentratu rudy żelaza i materiałów wtórnych, to wtedy: udział frakcji poniżej 0,5 mm ulegnie zwiększeniu, przewiewność wsadu oraz wydajność taśmy spiekania ulegną zmniejszeniu, zaś zwiększy się liczba cząstek stałych (emisji) pochodzących z procesu spiekania. Przewiewność mieszanki spiekalniczej można optymalizować poprzez zwiększenie zawartości paliwa we wsadzie albo poprzez zwiększenie wilgotności. Przeprowadzono eksperymentalną kontrolę zmiany proporcji między koncentratem a rudą żelaza. Zbadano wpływ składu granulometrycznego mieszanki aglomeratu oraz kształtu ziaren wsadu na jakość i skład fazowy wyprodukowanego spieku.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Microstructure and Properties of Low-Carbon PM Mn-Cr-Mo Steels Sintered under Different Conditions
Mikrostruktura i własności mechaniczne niskowęglowych, spiekanych stali Mn-Cr-Mo wytwarzanych w różnych warunkach
Autorzy:: Sułowski, M.
Ciaś, A.
Pieczonka, T.
Tematy:: structural PM materials
PM Mn steels
sintering process
sintering atmosphere
microstructure
mechanical properties
materiał strukturalny
stal spiekana
proces spiekania
spiekanie w atmosferze
mikrostruktura
właściwości mechaniczne; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356963.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the effect of sintering conditions on the microstructure and mechanical properties of low-carbon Mn-Cr-Mo PM steels. It was proved there is no effect of tempering temperature on the properties of Astaloy CrL-base steels, sintered at 1250°C in 5%H₂-95%N₂ mixture as compared with the properties of those sintered at 1120°C. The properties of Astaloy CrM-based steels, sintered at 1250°C in air were comparable or higher to Astaloy CrL-based steels. The addition of lump of ferromanganese was not sufficient for metal oxides reduction. The structure investigation confirmed the earlier observations that Mn-Cr-Mo PM steels have predominantly martensitic or martensitic/bainitic microstructure.
W artykule przedstawiono wpływ parametrów spiekania na mikrostrukturę i własności mechaniczne spiekanych, niskowęglowych stali manganowo-chromowo-molibdenowych. W pracy wykazano, że własności mechaniczne stali wykonanej na bazie proszku stopowego Astaloy CrL (l,5%Cr, 0,2%Mo, reszta Fe) spiekanej w temperaturze 1250°C w atmosferze 5%H₂-95%N₂ nie zależą od temperatury odpuszczania, czego nie stwierdzono podczas badań własności wytrzymałościowych tych stali wy- twarzanych w niższej temperaturze spiekania (1120°C). Ponadto, prowadzone badania wykazały, że stale wytworzone na bazie proszku stopowego Astaloy CrM (3%Cr, 0,5%Mo. reszta Fe) po spiekaniu w temperaturze 1250°C w atmosferze powietrza charakteryzowały się porównywalnymi lub wyższymi własnościami mechanicznymi niż stale wykonane na bazie proszku stopowego Astaloy CrL, wytwarzane w tych samych warunkach. Podczas spiekania w powietrzu zastosowano odłamkowe cząstki żelazomanganu o łącznej masie 52 g, które umieszczano w bezpośrednim sąsiedztwie próbek (całkowita masa próbek 490 g) w stalowej łódce, w celu redukcji tlenków. Jak wykazały badania, dodatek żelazomanganu był niewystarczający, aby zapewnić kompletną redukcję tlenków.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Utilising cold sintering process for sintering hydroxyapatite-polyetheretherketone nanocomposite
Autorzy:: Abbas, H. O.
Smeig, H. A.
Ameer, Z. J. A.
Tematy:: cold sintering process
PEEK
hydroxyapatite
two continuous phases
ceramic composites
proces spiekania na zimno
hydroksyapatyt
dwie fazy ciągłe
kompozyty ceramiczne; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/59116151.pdf Link otwiera się w nowym oknie
Opis:: Purpose: A novel technique of very low-temperature sintering named the cold sintering process is used to produce Highly dense hydroxyapatite-polyetheretherketone (HA-PEEK) nanocomposites. The polymers and ceramics are sintered at different temperatures; therefore, it is difficult to create ceramic matrix composites using traditional methods because the high temperatures might damage the polymers. It is hard to concurrently treat polymeric materials at high temperatures because HA often sinters at temperatures exceeding 1000°C. So, the study aimed to use a novel low-temperature sintering named Cold Sintering Process (CSP) with a Ts/ Tm ratio greater than 0.2 to alleviate this issue. This method could offer a production path with quick densification and less energy costs to increase throughput. Design/methodology/approach: In the current work, two different routes are used: The direct mixing and dissolution methods were used for powder preparation to fabricate a unique ceramic matrix composite. The study aimed to determine whether the preparation method could produce two continuous phases for better densification. The sintering temperature, pressure, holding time, and PEEK content were selected as the production parameters. The samples are characterised using a scanning electron microscope (SEM), X-ray energy dispersive spectrometry (EDS), an X-ray diffractogram (XRD), and a transition electron microscope (TEM). Also, physical and mechanical property measurements were detected, including density, water contact angle, hardness, and diametral tensile strength (DTS). Findings: It can be observed that a high densification compact (relative density 99.3%) can be observed by using the dissolution method HA-PEEK composites, which can be produced via the cold sintering process. The dissolution method can produce two continuous phases compared with the direct mixing method. All samples exhibit excellent hydrophilicity, which makes them good candidates for biomedical applications. Research limitations/implications: The biggest implication of the cold sintering method is the difficulty of making large-sized and complex-shaped samples. Practical implications: The dissolution method can produce two continuous phases compared with the direct mixing method. All samples exhibit excellent hydrophilicity, which makes them good candidates for biomedical applications. Originality/value: A novel technique was used for the first time to solve the problem of producing ceramic matrix composites with polymer as the dispersion phase.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effects of Microwave Sintering on Properties and Microstructure of Ferromanganese Alloy Powders
Autorzy:: Lei, L.
Libo, Z.
Linqing, D.
Hongbo, Z.
Guo, C.
Jinhui, P.
Qin, G.
Tematy:: microwave sintering
ferromanganese powder
densification
liquid phase
process conditions; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/947519.pdf Link otwiera się w nowym oknie
Opis:: Microwave sintering process was employed to agglomerate ferromanganese alloy powders. The effects of sintering temperature, holding time and particle size composition on the properties and microstructure of sintering products were investigated. The results was shown that increasing sintering temperature or holding time appropriately is beneficial to increase the compressive strength and volume density. SEM and EDAX analysis shows that the liquid phase formed below the melting point in the sintering process, which leads to densification. XRD patterns indicate that the main reaction during microwave sintering is the decarbonization and carburization of iron carbide phase. The experiment demonstrate that the optimum microwave sintering process condition is 1150°C, 10 min and 50% content of the powders with the size of –75 μm.
Dostawca treści:: Biblioteka Nauki

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