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Tytuł:
Tailored Al2O3-Al2TiO5-TiO2 Composite Ceramics from different Titanium Precursors
Autorzy:
Dittert, B.
Wiessner, M.
Angerer, P.
Lackner, J. M.
Leichtfried, H.
Powiązania:
https://bibliotekanauki.pl/articles/352009.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
precursor
infiltration
alumina
tialite
Opis:
Al2 O3 -Al2 TiO5 -TiO2 composites can be obtained by the infiltration of molecular titanium precursors into presintered α-Al2 O3 (corundum) cylinders. Two titanium tetra alkoxides, and two dialkoxy titanium bis (acetylacetonates) serve as precursors for TiO2 (rutile) and Al2 TiO5 (tialite). The precursors were infiltrated as ethanolic solutions. After sintering at 1550, 1600, and 1650°C, the prepared ceramics’ properties were investigated by SEM, in-situ HT-XRD, and conventional XRD. Titanium tetraisopropoxide leads to the highest content of Al2 TiO5 in the composite. The more reactive the precursor, considering the Al2 O3 /precursor interface, the lower and more anisotropic the grain growth, the more homogeneous is the TiO2 contribution and the higher is the content of Al2 TiO5 . Raising the sintering temperature causes an increase of the crystalline Al2 TiO5 content as well as of the grain growth. Moreover, the reactivity of the precursor molecule influences the Ti/(Al+Ti) ratio in the obtained tialite phase.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1277-1286
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Silica Fume and Alumina Addition on the Mechanical and Microstructure of Fly Ash Geopolymer Concrete
Autorzy:
Fong, Sue Min
Heah, Cheng Yong
Liew, Yun Ming
Abdullah, Mohd Mustafa Al Bakri
Hasniyati, Md Razi
Low, Foo Wah
Ng, Hui-Teng
Ng, Yong-Sing
Powiązania:
https://bibliotekanauki.pl/articles/2048824.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geopolymer
concrete
silica fume
alumina
Opis:
This paper discussed the effect of the addition of silica fume (2 wt.% and 4 wt.%) and alumina (2 wt.% and 4 wt.%) on the properties of fly ash geopolymer concrete. The fly ash geopolymer concrete achieved the highest 28-day compressive strength with 2 wt.% of silica fume (39 MPa) and 4 wt.% of alumina (41 MPa). The addition of 2 wt.% of silica fume increased the compressive strength by 105% with respect to the reference geopolymer (without additive). On the other hand, the compressive strength surged by 115% with 4 wt.% of alumina compared to the reference geopolymer. The addition of additives improved the compactness of the geopolymer matrix according to the morphology analysis.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 197-202
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Mechanical Properties and Microstructures of Aluminum Hybrid Composites Reinforced with Al2O3/GNPs Binary Particles
Autorzy:
Şenel, M. Can
Gürbüz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049630.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
aluminum
graphene
alumina
hybrid
Opis:
Nowadays, aluminum-based composites have been produced by pure alumina (Al2O3) or pure graphene nanoplatelets (GNPs) in aluminum matrix because of the high compressive strength of alumina and the solid lubricant properties of graphene. However, there are no studies on the influence of both alumina and graphene reinforced aluminum composites. In this study, Al-Al2O3 and Al-Al2O3-GNPs composites were reinforced with pure alumina (between 0 and 30 wt.%), pure graphene (0, 0.1, 0.3, 0.5 wt.%), and their hybrid forms (Al2O3-GNPs) by the powder metallurgy method. This method involved ultrasonic dispensing, mixing, filtering, drying, pressing, and sintering processes. From the test results, the micro Vickers hardness of pure aluminum (28.2±1 HV) improved to 51.5±0.8 HV (Al-30Al2O3) and 63.1±1 HV (Al-30Al2O3-0.1GNPs). Similarly, the ultimate compressive strength (UCS) enhanced from 92.4±4 MPa (pure aluminum) to 165±4.5 MPa (Al-30Al2O3) and 188±5 MPa (Al-30Al2O3-0.1GNPs), respectively. In conclusion, the Vickers hardness and ultimate compressive strength of aluminum hybrid composites improved up to 0.1 wt.% graphene content. After 0.1 wt.% graphene content, these mechanical properties decreased because of the clumping of graphene nanoparticles.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 97-106
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disruption of an Alumina Layer During Sintering of Aluminium in Nitrogen
Autorzy:
Pieczonka, T.
Powiązania:
https://bibliotekanauki.pl/articles/354008.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium
sintering
alumina layers
nitrogen atmosphere
Opis:
Aluminium oxide layer on aluminium particles cannot be avoided. However, to make the metal-metal contacts possible, this sintering barrier has to be overcome in some way, necessarily to form sintering necks and their development. It is postulated that the disruption of alumina layer under sintering conditions may originate physically and chemically. Additionally, to sinter successfully non alloyed aluminium powder in nitrogen, the operation of both types mechanism is required. It is to be noted that metallic aluminium surface has to be available to initiate reactions between aluminium and the sintering atmosphere, i.e. mechanical disruption of alumina film precedes the chemical reactions, and only then chemically induced mechanisms may develop. Dilatometry, gravimetric and differential thermal analyses, and microstructure investigations were used to study the sintering response of aluminium at 620°C in nitrogen, which is the only sintering atmosphere producing shrinkage.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 987-992
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic absorption of a new class of alumina foams with various high-porosity levels
Autorzy:
Zieliński, T. G.
Potoczek, M.
Śliwa, R. E.
Nowak, Ł. J.
Powiązania:
https://bibliotekanauki.pl/articles/177924.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sound absorption
porous materials
alumina foam
Opis:
Recently, a new class of ceramic foams with porosity levels up to 90% has been developed as a result of the association of the gelcasting process and aeration of the ceramic suspension. This paper presents and discusses original results advertising sound absorbing capabilities of such foams. The authors man- ufactured three types of alumina foams in order to investigate three porosity levels, namely: 72, 88, and 90%. The microstructure of foams was examined and typical dimensions and average sizes of cells (pores) and cell-linking windows were found for each porosity case. Then, the acoustic absorption coefficient was measured in a wide frequency range for several samples of various thickness cut out from the foams. The results were discussed and compared with the acoustic absorption of typical polyurethane foams proving that the alumina foams with high porosity of 88-90% have excellent sound absorbing properties competitive with the quality of sound absorbing PU foams of higher porosity.
Źródło:
Archives of Acoustics; 2013, 38, 4; 495-502
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between microstructure and mechanical properties of directly bonded copper-alumina ceramics joints
Autorzy:
Pietrzak, K.
Olesińska, W.
Kaliński, D.
Strojny-Nędza, A.
Powiązania:
https://bibliotekanauki.pl/articles/199776.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
directly bonded copper-alumina ceramics joints
Opis:
The effect of phase transformations induced in the surface layer of alumina ceramics during its direct joining with copper activated with oxygen or titanium on the mechanical strength of the ceramic/copper joints was examined. The materials used in the experiments were an alumina single crystal, alumina ceramics (97.5 wt% Al2O3), the cermet mixtures: Cu-Cu2O with 10-50 wt% of Cu2O, copper with 5 wt% of Ti, and copper with 5 wt% of Ti and 10 wt% of Ag. The microstructure of the transition layer was examined by the X-ray diffraction method (XRD), scanning electron microscopy method (SEM) and energy dispersive x-ray spectroscopy (EDX). The mechanical strength of the joints was measured using the three-point bending method. The amount of oxygen optimal for the joining process was determined. It has been demonstrated that the cohesion of the joints depends not only on the formation of the individual phases but also, or even primarily, on the microstructure of the transition layer formed between them.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 23-32
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Assessment of Alumina Production Waste Impact on Natural Water
Autorzy:
Kuznetsov, V. S.
Suprun, I. K.
Powiązania:
https://bibliotekanauki.pl/articles/123535.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
alumina
red mud
utilisation
sludge dump
Opis:
The paper is dedicated to the issue of assessment of alumina (red mud) production waste on natural water. The growth of the number of aluminium-producing facilities leads to the expansion of exclusion areas to store the production waste – sludge dumps. A considerable part of research on red mud utilisation is focused on its use in the iron-and-steel industry. Furthermore, the technologies of red mud usage in the construction industry gain substantial significance for land reclamation, isolation of polluted industrial and agricultural lands as well as the effluent and industrial emissions treatment.
Źródło:
Journal of Ecological Engineering; 2018, 19, 2; 154-158
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of cement composites using alumina-lignin hybrid materials admixture
Autorzy:
Klapiszewska, Izabela
Ślosarczyk, Agnieszka
Klapiszewski, Łukasz
Jesionowski, Teofil
Powiązania:
https://bibliotekanauki.pl/articles/110198.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alumina
lignin
hybrid materials
cement composites
Opis:
In the framework of this study, Al2O3-lignin hybrid materials differing in terms of the weight ratio of the inorganic and organic components were designed and obtained. The method of mechanical grinding of ingredients with simultaneous mixing using a mortar grinder and a high-performance ball mill was used in order to obtain the above-mentioned systems. The effectiveness of obtaining alumina- lignin materials was confirmed using Fourier transform infrared spectroscopy (FTIR) and, indirectly, by the colorimetric analysis. FTIR analysis allowed to confirm that hydrogen bonds formed between the components and classify the resulting systems as Ist class hybrid materials. In the course of the conducted research, the relatively high thermal stability of the hybrid materials was also confirmed and the dispersion and morphological character (SEM) of the obtained systems was determined. Favourable physicochemical and microstructural evaluation allowed to qualify the alumina-lignin hybrid systems as functional admixtures for cement mortars. As part of the tests, it was confirmed that the presence of lignin in the cement composites contributes to the increase of the plasticity of the mixture. In turn, the inorganic component allowed to preserve (and, in case of selected systems, improve) the mechanical properties of the final composites. The most favourable results of application tests were obtained for alumina-lignin hybrid systems with a weight ratios equal to 5:1 and 2:1. The analysis of these systems indicated that there is a clear improvement of mechanical properties, whit a simultaneous enhancement of the plasticity of the mixture in comparison to the reference sample.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1401-1412
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gospodarka boksytami i aluminą w krajowym przemyśle materiałów ogniotrwałych
Management of bauxite and alumina in the domestic refractory industry
Autorzy:
Kamyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/394429.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
boksyty surowe i kalcynowane
alumina kalcynowana
materiały ogniotrwałe
raw bauxite
calcined bauxites
calcined alumina
refractory industry
Opis:
W krajowym przemyśle materiałów ogniotrwałych istotne znaczenie mają surowe boksyty do produkcji cementów, boksyty kalcynowane ogniotrwałe oraz alumina kalcynowana (tlenek glinu). Wykorzystywane są one do produkcji ogniotrwałych cementów glinowych oraz ogniotrwałych wyrobów formowanych wysokoglinowych. Jednocześnie całość zapotrzebowania na te surowce pokrywana jest przez import - głównie z krajów europejskich, a w przypadku boksytów kalcynowanych również z Chin i Gujany. Reeksport utrzymuje się na minimalnym poziomie i dotyczy przede wszystkim boksytów kalcynowanych. Głównym użytkownikiem surowców od lat pozostaje przedsiębiorstwo Górka Cement w Trzebini (dawne Zakłady Surowców Ogniotrwałych „Górka"), które obecnie zużywa całość boksytów surowych do produkcji cementów oraz większość aluminy kalcynowanej. Boksyty kalcynowane i pozostała część aluminy kalcynowanej stanowią półprodukt do wytwarzania ogniotrwałych wyrobów formowanych wysokoglinowych. Krajowymi ich producentami są przede wszystkim Vesuvius Poland Sp. z o.o. Skawina, ArcelorMittal Refractories Sp. z o.o. Kraków i PCO Żarów SA.
Raw "cement' bauxite, calcined bauxite and calcined alumina (aluminum oxide) have large importance in the domestic refractory industry. They find use in the production of refractory aluminous cements and shaped high-alumina refractory products. Whole demand for these raw materials is met by imports - primarily from some European countries, but in case of calcined bauxite - also from China and Guyana. Re-exports are marginal, only in case of calcined bauxite. The main consumer of studied raw materials is Górka Cement of Trzebinia (former „Górka" Refractory Raw Materials Works), which currently uses all imported raw "cement' bauxite and the majority of calcined alumina. Refractory calcined bauxite and the remaining part of calcined alumina are semiproducts for manufacture of shaped high-alumina refractory products. Their main domestic producers are: Vesuvius Poland Ltd. of Skawina, Arcellormittal Refractories Ltd. of Kraków and PCO Żarów SA.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2014, 88; 109-118
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Failure Strength of Real Alumina Foams with Use of the Periodic Structure Model
Autorzy:
Nowak, M.
Nowak, Z.
Pęcherski, R. B.
Potoczek, M.
Śliwa, R. E.
Powiązania:
https://bibliotekanauki.pl/articles/352701.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
periodic cell structure
alumina open-cell foam
Young modulus
strength of alumina foams
Burzyński limit criterion
Opis:
The subject of the study are alumina foams produced by gelcasting method. The results of micro-computed tomography of the foam samples are used to create the numerical model reconstructing the real structure of the foam skeleton as well as the simplified periodic open-cell structure models. The aim of the paper is to present a new idea of the energy-based assessment of failure strength under uniaxial compression of real alumina foams of various porosity with use of the periodic structure model of the same porosity. Considering two kinds of cellular structures: the periodic one, for instance of fcc type, and the random structure of real alumina foam it is possible to justify the hypothesis, computationally and experimentally, that the same elastic energy density cumulated in the both structures of the same porosity allows to determine the close values of fracture strength under compression. Application of finite element computations for the analysis of deformation and failure processes in real ceramic foams is time consuming. Therefore, the use of simplified periodic cell structure models for the assessment of elastic moduli and failure strength appears very attractive from the point of view of practical applications.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1903-1908
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density functional simulation of metal oxides: $Al_2O_3$ and $Fe_3O_4$
Autorzy:
Łodziana, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2028983.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
density functional theory
metal oxides
alumina
magnetite
Opis:
The study of the metal oxides is a rapidly developing area of research. Below a theoretical method based on the density functional theory, common in studying ceramics, is briefly presented. Application of the theory to the surface and the bulk properties of alumina and magnetite are presented. Relaxation mechanism of two different surfaces of alumina and the (100) surface of Fe3O4 are shown. The mutual stability of the ? and ? phases of Al2O3 is calculated.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 561-572
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of parameters of grit blasting conducted Dymet® device 412K to obtain roughness
Autorzy:
Szyfelbain, M.
Charchalis, A.
Starosta, M.
Powiązania:
https://bibliotekanauki.pl/articles/244066.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
roughness
blasting
Dymet® 412K gun
alumina
Opis:
There are several fundamental steps for the technological preparation, which are required to optimize the thermal spray coatings. In order to ensure proper bonding of the coating, important is properly preparation of substrate. The surface of the substrate has to be clean and should have a suitable roughness after previously performed treatment. Knowledge about the effects of process parameters allows designing the coatings obtained with an optimal adherence. Only when all the components of the spraying coating process are used correctly there is possible properly design the technology. The article describes the impact of technological parameters of grit blasting to obtain the roughness of the steel substrate (steel S185) to the process of metallic coatings by cold gas dynamic spraying. Research was carried out by using the Dymet® 412K appliance, designed for applying metal coatings and substrate surface cleaning. Grit blasting is a mechanical method of surface preparation of metal parts. It allows obtaining a high degree of surface cleanliness and a determined roughness. The authors took into account parameters such as operational pressure, spray angle (incidence) of abrasive grit blasting in the axis of the stream and feed rate of used abrasive particles (Al2O3) passed to the nozzle of spray gun. Carried out the multiple regression analysis of the roughness parameters results. It revealed the existence of certain influences and changes of process parameters, which affect on the surface quality. Carried out calculations by using a multiple regression showed that the greatest correlation is between the required roughness and the feed rate of used abrasive particles. The studied roughness was described by the parameters: Ra, Rz, Rt and RSm. Stepped growth (from 0.1 to 0.8 g/s) of abrasive particles feed rate caused a decline of all of the roughness parameters. It has been found that the values of the roughness in the least depend on the operational pressure.
Źródło:
Journal of KONES; 2016, 23, 4; 521-526
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallization behavior and microstructure of bio glass-ceramic system
Autorzy:
Mehdikhani, B.
Borhani, G. H.
Powiązania:
https://bibliotekanauki.pl/articles/412654.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
bio glass-ceramic
alumina
crystallization
mechanical behavior
Opis:
The effects of Al2O3 on the crystallization behavior of glass compositions in the Na2O-CaO-SiO2 system were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Effect of Al2O3 content on the mechanical, density, phase formation and microstructures of Na2O-CaO–P2O5–Al2O3-SiO2 glass ceramics were studied. Thermal parameters of each glass were studied by DTA. The density of the glass ceramic samples was measured by Archimedes’ method. It was found that the glass–ceramic containing 2.0 molar percent Al2O3 had desirable sintering behavior and reached to an acceptable density. Phase investigation and micro structural study were performed by XRD and SEM, respectively.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 58-68
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilization of heavy metal particles in Al2O3-W suspensions
Autorzy:
Kędzierska-Sar, A.
Falkowski, P.
Szafran, M.
Powiązania:
https://bibliotekanauki.pl/articles/351795.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ceramic matrix composites
alumina
tungsten
hetero-flocculation
Opis:
Ceramic - metal composites are widely used materials in a whole world. There were invented many fabrication methods for those kind of materials, but still exists some problems which need to be fixed. Stability of high density metal particles (e.g. W, Mo, Nb) in ceramic-metal composite suspensions is one of crucial issues to be solved in order to obtain homogenous composite material with desired properties such as high fracture toughness, mechanical strength, hardness, wear resistance. In this paper, results of two different methods of stabilizing W particles in Al2O3 - W - H2O system were compared. The zeta potential by laser doppler electrophoresis, stability by static multiple light scattering and rheological behavior of prepared suspensions were analyzed. As a result application of hetero-flocculation effect was consider as a good way to obtain homogeneous dispersion of metal particles with a high density.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1465-1470
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Magnetic Properties of Fe Nanowire Arrays Electrodeposited in Self-Ordered Alumina Membrane
Autorzy:
Dobosz, I.
Gumowska, W.
Czapkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/351999.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anodic alumina membrane
hysteresis loop
iron
nanowires
Opis:
Magnetic properties of Fe nanowire arrays (NWs) electrodeposited in anodic alumina membranes have been studied. The influence of nanowire geometry (length, pore diameter) and an external magnetic field applied during electrodeposition process on the magnetic properties of nanowire arrays was investigated. With the use of the X-ray diffraction analysis the structure of iron wires was determined. The iron wires have the regular Body Centered Cubic structure. Magnetic measurements show that shape anisotropy aligns the preferential magnetization axis along the wire axis. It was found that the application of an external magnetic field in a parallel direction to the sample surface induces magnetic anisotropy with an easy axis of magnetization following the nanowire axis. The dependence of the height of Fe wires on the electrodeposition time was determined.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 983-990
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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