Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "O3" wg kryterium: Temat


Tytuł:
Model Research On Synthesis Of Al2O3-C Layers By MOCVD
Badania modelowe nad syntezą warstw Al2O3-C metodą MOCVD
Autorzy:
Sawka, A.
Kwatera, A.
Powiązania:
https://bibliotekanauki.pl/articles/352553.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MOCVD method
cutting tools
composite layers Al2O3-C
Al2O3
metoda MOCVD
narzędzia tnące
warstwy kompozytowe Al2O3-C
Opis:
These are model studies whose aim is to obtain information that would allow development of new technology for synthesizing monolayers of Al2O3-C with adjusted microstructure on cemented carbides. The Al2O3-C layer will constitute an intermediate layer on which the outer layer of Al2O3 without carbon is synthesized. The purpose of the intermediate layer is to block the cobalt diffusion to the synthesized outer layer of Al2O3 and to stop the diffusion of air oxygen to the substrate during the synthesis of the outer layer. This layer should be thin, continuous, dense and uniform in thickness. Al2O3-C layers were synthesized from aluminum acetylacetonate by the CVD method on quartz glass heated in an induction furnace in the temperature range 800-1000°C using argon as a carrier for the reactants. The layers were prepared also at low temperatures and were then subjected to crystallization at higher temperatures. The resulting layers prepared at temperatures above 900°C were nanocrystalline (including the α- Al2O3 phase). Due to the fact that crystallization can be controlled, we may have a greater influence on the structure and thus the properties of the layer compared to direct synthesis at high temperature.
Celem prowadzonych modelowych badań nad syntezą warstw Al2O3 metodą MOCVD jest uzyskanie informacji przydatnych do opracowania nowej technologii nanoszenia tych warstw na podłoża z węglików spiekanych. Warstwa Al2O3-C będzie stanowić pośrednią warstwę, na której będzie syntezowana zewnętrzna warstwa Al2O3 nie zawierająca węgla. Zadaniem warstwy pośredniej jest blokowanie dyfuzji kobaltu do syntezowanej zewnętrznej warstwy Al2O3 oraz ochrona podłoża przed utlenianiem podczas syntezy zewnętrznej warstwy. Warstwa ta powinna być cienka, ciągła, gęsta i mało zróżnicowana w grubości. Warstwy Al2O3-C syntezowano z acetyloacetonianu glinu metodą CVD na szkle kwarcowym. Podłoże ogrzewano indukcyjnie w zakresie temperatur 800-1000°C. Gazem nośnym był argon. Warstwy syntezowane w niższych temperaturach były poddawane krystalizacji w wyższych temperaturach. Otrzymane warstwy w temperaturach powyżej 900°C były nanokrystaliczne (zawierały fazę α- Al2O3). Z uwagi na to, że proces krystalizacji warstw może być kontrolowany, można wpływać na strukturę oraz właściwości warstw.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 1125-1128
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and properties of composite coatings obtained on aluminium alloys
Autorzy:
Bara, M.
Kmita, T.
Korzekwa, J.
Powiązania:
https://bibliotekanauki.pl/articles/355423.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite coatings
hard anodising
Al2O3
Opis:
This paper presents methods of modifying the anode surface layers of Al2O3 by introducing carbon to their rnicrostructure. Composite coatings were prepared using two different methods. In the first, coatings were formed by means of oxidation under constant current conditions. Anodic oxidation of aluminium was conducted in a multicomponent electrolyte with the addition of organic acids and graphite. The second method was based on the formation of oxide coatings in an electrolyte without the addition of graphite or heat treatment of the layers of succinic acid. The obtained coatings were tested using SEM, TEM, and GDOES (glow discharge optical emission spectrometry) and their tribological and stereometric properties were measured. The study demonstrated the beneficial effects of the methods when used to improve the tribological properties of sliding couples.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1453-1458
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TEM investigation of phases formed during aluminium wetting of MgO at [100], [110] and [111] orientations
Analiza fazowa metodą TEM produktów reakcji powstałych w czasie zwilżania przez aluminium podłoży MgO o orientacji [100], [100] i [111]
Autorzy:
Morgiel, J.
Sobczak, N.
Pomorska, M.
Nowak, R.
Wojewoda-Budka, J.
Powiązania:
https://bibliotekanauki.pl/articles/354574.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al/MgO reaction
α-Al2O3
MgAl2O4
microstructure
TEM
EDS
reakcja Al/MgO
Al2O3
Opis:
The interaction of liquid aluminium (5N) with single crystal MgO substrates of [100], [110] and [111] orientations (surface roughness <1 nm) were studied using sessile drop wettability test performed at 1000ºC for 1 hour in vacuum (5 x 10-6 mbar). The observations performed using scanning electron microscopy (SEM) showed that the interaction of liquid metal with MgO crystals in all cases resulted in the formation of reaction products region (RPR) of thickness varying from 40 up to 80 microns in depth. In each case the RPR consisted mainly of coarse dendrite-like crystallites of few microns thick surrounded by net of much thinner channels. Occasionally away from the RPR centre the areas built of much finner but also dendrite- or filament-like crystallites were noted. The thin foils for transmission electron microscopy (TEM) investigations were cut using focused ion beam system (FIB) both from drop/RPR as well as RPR/MgO interfacial regions. The electron diffractions proved that the dominating coarse dendrite-like crystallites are of the same α-Al2O3 type throughout the whole RPR for all substrates orientations. Similarly, the colonies of finer crystallites always showed diffraction patterns characteristic for MgAl2O4 spinel. Therefore, the performed investigation indicated, that both the reaction layer depth and the reaction path represented by the sequence and type of phases present in Al/MgO RPR remain roughly similar for all examined orientations, i.e. that the substrate orientation control neither reaction kinetics, nor affects final phase composition of RPR.
Oddziaływanie ciekłego aluminium (5N) z mono-krystalicznymi podłożami o orientacji [100], [110] i [111] (chropowatość <1nm) badano metodą kropli leżącej w 1000ºC przez 1 godzine w dynamicznej próżni rzędu 10-4 Pa. Obserwacje z wykorzystaniem mikroskopii skaningowej (SEM) wykazały, że oddziaływanie ciekłego metalu z kryształami MgO we wszystkich przypadkach prowadziło do wytworzenia strefy produktów reakcji (tzw. reaction produkt region - RPR) o grubości od 40 do 80 mum. W strefach tych wystepowały wydzielenia o kształcie dendrytycznym rozdzielone waskimi kanałami aluminium. Na krawędziach strefy reakcji stwierdzono obecność kolejnej strefy o grubości kilku- kilkunastu-mikrometrów wypełnionej materiałem o jeszcze drobniejszej włóknistej strukturze. Obserwacje mikrostruktury prowadzono z wykorzystaniem mikroskopii transmisyjnej na cienkich foliach wycietych technika FIB zarówno z granic obu stref, oraz z granicy RPR/MgO. Obserwacje te, w powiązaniu z analizą dyfrakcji elektronowych wykazały, że dla MgO wszystkich orientacji dominujace w RPR duże wydzielenia o kształcie dendrytycznym odpowiadaja fazie α- Al2O3. Równoczesnie, analiza dyfrakcji drobniejszych krystalitów zlokalizowanych w pod-strefie ulokowanej na granicach poza centrum RPR wykazała, że mają one budowe charakterystyczna dla spinelu MgAl2O4. Przeprowadzone badania wykazały, że zarówno grubość RPR, a w tym jej pod-strefy drobniejszych wydzieleń na jej obrzeżach, jak też drogą reakcji reprezentowana przez sekwencje i typ wydzielających się faz w czasie oddziaływania ciekłego aluminium jest identyczna dla wszystkich analizowanych monokrystalicznych podłoży MgO, tj. orientacja tych podłoży nie ma wpływu ani na skład fazowy produktów reakcji ani też na kinetykę tego procesu.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 497-500
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of supports on coke deposition on supported platinum and platinum-tin catalysts investigated by FT-IR spectroscopy
Autorzy:
Sarbak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/778486.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
FTIR
katalizator Pt-Sn
Al2O3
SiO2
SiO2-Al2O3
coke deposit
Pt-Sn catalysts
Opis:
Coke deposit is produced from ethylene on the surface of the platinum and platinum-tin catalysts supported on two various AI2O3, SiO2 and SiO2-Al2O3. The coke amount and the structure depend on the type and the amount of the components introduced onto the catalyst support and on the type of the support. It has been found that the surface area of the support has no significant effect on the type of species in the coke deposit. The analysis of the FT-IR spectra has shown the presence of different species on the surface of the catalysts, including carboxyl groups, pseudo-graphite (polyaromatic) structures, polyphenylene groups, acetyl groups, carbonyl groups of acetone and formate type, enol species.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 1; 23-26
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR measurements of ceramic cores used in the aircraft industry
Autorzy:
Stefaniuk, I.
Rogalska, I..
Potera, P.
Wróbel, D.
Powiązania:
https://bibliotekanauki.pl/articles/148814.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Al2O3
electron paramagnetic resonance (EPR)
mullite
nanopowders
Opis:
In this work the electron paramagnetic resonance (EPR) spectra of Al2O3 and ZrO2 powders were measured for different size of grains (0.074, 0.044 mm) as well as the mullites (0.07 and 0.12 mm). Also were investigated the ceramic cores. The measurements were performed at room temperature and in the temperature range from 140 up to 380 K. The main purpose of this work was to investigate the possible relationships between the EPR spectra and the size of powder grains as well as the identification of EPR spectra in view of the potential application of EPR technique as a fingerprinting method.
Źródło:
Nukleonika; 2013, 58, 3; 391-395
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Al2O3 sealing elements lapping
Autorzy:
Molenda, J.
Barylski, A.
Powiązania:
https://bibliotekanauki.pl/articles/246768.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
ceramic materials
Al2O3
lapped surface roughness
Opis:
The term ceramics is applied to a range of inorganic materials of widely varying uses. Ceramics in recent years have been sought in many applications due to their improved properties like low density, high fracture toughness, high hardness and wear resistance, good high temperature strength and others. On the negative side, they are far less ductile than metals and tend to fracture immediately when any attempt is made to deform them by mechanical work. This is why machining of ceramic materials is a big challenge and quite expensive affair. Primarily they are finished by abrasive machining processes such as grinding, lapping and polishing. Lapping is used for achieving ultra-high finishes and close tolerances between mating pieces. It has been found very useful in the manufacture of optical mirrors and lenses, ceramics, hard disk drive, semiconductor wafers, valve seats, ball bearings, and many more parts. Lapping process on ceramics usually produces the surface finish as about 1-0.01 mi m of Ra. Aluminium oxide is one of the hardest materials known. Its high hardness promotes a series of applications in mechanical engineering, such as bearings and seals. During research Al2O3 sealing elements were lapping. The main goal was to check the results of machining for different process parameters. The experiments were conduct during flat lapping with use of ABRALAP 380 lapping machine. The lapping machine executory system consists of three conditioning rings. The process results were surface roughness Ra and material removal rate.
Źródło:
Journal of KONES; 2012, 19, 3; 311-318
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Al2O3 Ceramic Particles on Corrosion Behaviour and Tribological Properties of Nickel Composite Coatings
Autorzy:
Nowak, M.
Najder, A.
Opyrchał, M.
Boczkal, S.
Żelechowski, J.
Bigaj, M.
Gawlik, M.
Powiązania:
https://bibliotekanauki.pl/articles/354798.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite coating
Al2O3
corrosion resistance
tribological properties
Opis:
The paper presents a study on corrosion behaviour and tribological properties of nickel composite coatings deposited by electrochemical method on aluminium alloy from 2xxx series (AlCu4MgSi). The nickel composite coatings were produced in a Watts bath of the following chemical composition: NiSO4·7H2O 150 g/l, NiCl2·6H2O 30 g/l, H3BO3 30 g/l with the addition of saccharin in an amount of 2 g/l. As hard ceramic dispersed particles embedded in the coating, alumina (Al2O3) was used in an amount of 12,5; 25; 50 and 75 g/l. Coatings were produced using cathodic current density of 6 A/dm2, bath temperature of 60°C, pH 4, and the time 60 minutes. The electroplating bath was stirred with a mechanical stirrer (350 rpm). The results obtained were compared with a nickel coating deposited without the ceramic particles. It was found that the presence of Al2O3 increases the wear resistance of composite coatings, but does not significantly improve the corrosion properties.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 195-198
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of Oxide Coatings Produced on Aluminum Alloys by MAO and Chemical Methods
Autorzy:
Jędrusik, M.
Dębowska, A.
Kopia, A.
Powiązania:
https://bibliotekanauki.pl/articles/354014.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MAO
chemical method
corrosion resistance
aluminium alloys
Al2O3
Opis:
The study compared the properties of oxide coatings formed on aluminium alloys produced by: MAO (micro – arc oxidation), and the chemical method (oxidation in acid). Morphology, microstructure and of the coatings was analysed with a scanning electron microscope SEM. Corrosion resistance were tested in potentiometer – dynamic. The layers produced by MAO significantly improved corrosion resistance. Coatings produced after 3 minutes of oxidation had better corrosion resistance than the coatings after 5 minutes of oxidation. The layers produced by chemical method didn’t improve corrosion resistance of aluminium alloy.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 125-128
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new ceramic composite based on spherical aluminium oxide for auxiliary panels in high-temperature firing processes
Autorzy:
Spyrka, M.
Atraszkiewicz, R.
Klimek, L.
Powiązania:
https://bibliotekanauki.pl/articles/1818499.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
ceramics
mechanical properties
holospheres
Al2O3
ceramika
właściwości mechaniczne
holosfery
Opis:
Purpose: The subject of the research and investigation is a new ceramic foundry composite based on a spherical form of aluminium oxide. It is intended to limit the occurrence of technological problems related to the appropriate selection of auxiliary refractory materials, such as cracking, high heat capacity and variable coefficient of thermal expansion. Design/methodology/approach: A composite ceramic material with the spherical form of aluminium oxide included allows to reduce mass and stabilize characteristics of dimensional changes as a function of temperature in auxiliary panels in high-temperature firing processes with typical manufacturing process of the ceramics, which is gravity casting, drying and high-temperature firing. Findings: The study showed that the quantitative share of the spherical form of Al2O3 in the volume of ceramic material has a major impact on its properties. An increased share of spheres translates into greater material porosity and lower matrix density but also, by reducing the cross-section, into decreased strength properties. In the case of the developed ceramic material, there is no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature, which is the case with traditional ceramic materials. Research limitations/implications: The strength of presented composite isn’t good and constitutes a further direction of research and development of the material. Practical implications: Although decreased strength properties, the composite with no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature could be used as panels in high-temperature firing processes. Originality/value: New ceramic foundry composite based on a spherical form of aluminium oxide for auxiliary panels in high temperature processes.
Źródło:
Archives of Materials Science and Engineering; 2020, 101, 1; 5--14
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Alloying Additions on High Temperature Interaction Between Molten Compacted Graphite Iron and Alumina
Autorzy:
Sobczak, N.
Bacior, M.
Turalska, P.
Bruzda, G.
Homa, M.
Sobczak, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/354903.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compacted graphite iron
Al2O3
sessile drop method
wettability
interface
Opis:
High temperature behavior of three compacted graphite iron (CGi) alloys on polycrystalline aluminasubstrates (99.7%, porosity <3%) were examined by the sessile drop method combined with classical contact heating procedure in flowing Ar. High-speed high-resolution CCd camera was used for continuous recording of the CGi/Al2 O3 couples during melting alloy, heating to and holding the couples at the test temperature of 1450°C for 15 min and their subsequent cooling. The comparative studies were made with conventional CGi (in wt.%: 3.70 C, 2.30 Si, 0.44 Mn, 0.054 P, 0.017 Mg, 0.015 S) and two alloys additionally containing the same amounts of 0.25 Mo, 0.1 V, 0.045 Sn and 0.032 Sb with different concentrations of Mg + Cu additions, i.e. 0.01Mg + 0.33Cu and 0.02Mg + 0.83Cu. All three CGi alloys demonstrated non-wetting behavior on the Al2 O3 substrates while the contact angle values slightly decreased with increase of the Mg + Cu content in the alloy, i.e. 131° (unalloyed CGi), 130° (0.01Mg + 0.33Cu) and 125° (0.02Mg + 0.83Cu). Structural characterization of solidified couples by light microscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy revealed: 1) heterogeneous nucleation of discontinuous graphite layer at the drop-side interfaces and on the surface of the drops; 2) reactively formed Mg-rich oxide layer at the substrate-side interface; 3) the formation of satellite droplets on the surface of the drops during their solidification; 4) degeneration of initially compacted graphite to lamellar graphite after remelting and subsequent solidification of the drops, particularly in their surface layer.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1227-1238
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of aluminium alloy anodizing and casting methods on structure and functional properties
Autorzy:
Konieczny, J.
Labisz, K.
Polok-Rubiniec, M.
Włodarczyk-Fligier, A.
Powiązania:
https://bibliotekanauki.pl/articles/353080.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anodization
surface treatment
alumina
Al2O3
aluminium alloys
wear resitance
Opis:
This paper presents the influence of casting method and anodic treatment parameters on thickness and structure of an anodic layer formed on aluminium alloys. As test materials was used the aluminium alloy AlSi9Cu3, which was adopted to the casting process and anodic treatment. In this paper are presented the wear test results and metallographic examination, aswell as hardness of non-anodised and anodised alloys subjected to anodising process.The investigations were performed using light and electron microscopy (AFM) for the microstructure determination. The morphology and size of the layer was also possible to determine. The anodising conditions for surface hardening and itsinfluence on properties was analysed. The structure of the surface laser tray changes in a way, that there is a different thicknessof the produced layer. The aluminium samples were examined in terms of metallography using the optical microscope withdifferent image techniques as well as light microscope. Improving the anodization technology with appliance of differentanodising conditions. Some other investigation should be performed in the future, but the knowledge found in this researchconcerning the proper process parameters for each type of alloy shows an interesting investigation direction. The combinationof metallographic investigation for cast aluminium alloys - including electron microscope investigation - and anodisingparameters makes the investigation very attractive for automobile industry, aviation industry, and others, where aluminium alloys plays an important role.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1337-1342
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of ZrO2 and Al2O3 Addition on the Physical Properties of Cu-Mo-Cr Alloy by Liquid Phase Sintering
Autorzy:
Cho, Yeong-Woo
Sim, Jae-Jin
Heo, Sung-Gue
Kim, Hyun-Chul
Lee, Yong-Kwan
Byeon, Jong-Soo
Lee, Yong-Tak
Lee, Kee-Ahn
Seo, Seok-Jun
Park, Kyoung-Tae
Powiązania:
https://bibliotekanauki.pl/articles/2049193.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al2O3
ZrO2
Cu-Mo-Cr
sintering
powder metallurgy
Opis:
In this study, the effect of the addition of ZrO2 and Al2O3 ceramic powders to Cu-Mo-Cr alloy was studied by examining the physical properties of the composite material. The ceramic additives were selected based on the thermodynamic stability calculation of the Cu-Mo-Cr alloys. Elemental powders, in the ratio Cu:Mo:Cr = 60:30:10 (wt.%), and approximately 0-1.2 wt.% of ZrO2 and Al2O3 were mixed, and a green compact was formed by pressing the mixture under 186 MPa pressure and sintering at 1250°C for 5 h. The raw powders were evenly dispersed in the mixed powder, as observed by scanning electron microscopy. After sintering, the microstructures, densities, electrical conductivities, and hardness of the composites were evaluated. We found that the addition of ZrO2 and Al2O3 increased the hardness and decreased the electrical conductivity and density of the composites.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 683-687
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacture of Toughened Al2O3-Based Composites by the Combination of RBAO and SPS Processes
Autorzy:
Rocha-Rangel, Enrique
Calles-Arriaga, Carlos A.
López-Hernández, Juan
Rodríguez-García, José A.
Powiązania:
https://bibliotekanauki.pl/articles/2203745.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RBAO process
SPS process
Al2O3
fracture toughness
ceramic composites
Opis:
The effect of additions of silver or titanium (0.5 or 3 vol.%) microparticles on the microstructure, as well as some physical properties of Al2O3-based composites, were studied. The processing method for the manufacturing of alumina-based composites was a combination of RBAO and SPS processes. After the SPS process, bodies with almost full density were obtained. Observations by optical microscopy show a very fine and homogenous microstructure in all samples. Concerning mechanical properties, the addition of metals on alumina increases its fracture toughness significantly (112% for the sample with additions of silver, while the composite with additions of titanium fracture toughness increases by 72%). In terms of optical properties, both silver and titanium improve the absorbance in the visible range.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 249--255
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of a high wear resistance AA7075/AL2O3 composites via liquid metallurgy process
Autorzy:
Sivaraman, R.
Jalil, Abduladheem Turki
Aravindhan, Surendar
Nan, Zhao
Vini, M. Heydari
Daneshmand, S.
Powiązania:
https://bibliotekanauki.pl/articles/27312401.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zużycie
kompozyty
odlewanie
AA7075
Al2O3
wear
composites
stir casting
Opis:
In the present study, AA7075/Al2O3 composites have been fabricated via liquid metallurgy process. AA7075 alloy and Al2O3 particles were taken as the base matrix and reinforcements, respectively. Then, contents of 3 and 6 wt. % of Al2O3 subdivisions were added into the AA7075 matrix. To improve wettability and distribution, reinforcement particles were pre-heated to a temperature of 550°C for each composite sample. A hardened EN32 steel disc as the counter face was used to evaluate the wear rate pin-on-disc. The results showed that the wear rate of the AA/Al2O3 composites was smaller than that of the monolithic AA7075 samples. Finally, the worn surfaces of samples were investigated by SEM.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 205--210
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Ceramic Injection Moulding and Pressure Infiltration to the Manufacturing of Alumina/AlSi10Mg Composites
Autorzy:
Matula, G.
Krzysteczko-Witek, J.
Tomiczek, B.
Powiązania:
https://bibliotekanauki.pl/articles/352031.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite materials
pressure infiltration
ceramic injection moulding
aluminium alloy
Al2O3
Opis:
Ceramic injection moulding and gas pressure infiltration were employed for the manufacturing of alumina/AlSi10Mg composites. Porous ceramic preforms were prepared by mixing alumina powder with a multi-binder system and injection moulding of the powder polymer slurry. Then, the organic part was removed through a combination of solvent and thermal debinding, and the materials were finally sintered at different temperatures. The ceramic preforms manufactured in this way were infiltrated by an AlSi10Mg alloy. The microstructure and properties of the manufactured materials were examined using scanning electron microscopy, mercury porosimetry and bending strength testing. The results of transmission electron microscopy and scanning electron microscopy observations show that the fabricated composite materials are characterised by the percolation type of the microstructure and a lack of unfilled pores with good cohesion at the metal-ceramic interfaces. This is surprising considering that over 30% of the pores are smaller than 1 μm. The results show that the bending strength of the obtained composites decreased with increasing sintering temperature of the porous preforms.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2101-2106
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies