Graphite filters have previously been employed based on petrol coke. Wetting between molten aluminium and graphite is studied. Al 3 C 4 is formed at the interface between aluminium and graphite. In filtration of aluminium inclusions such as Al 3 C 4 formed in the hall electrolysis are removed. Wetting between aluminium and Al 3 C 4 (graphite) is …
Materials Science and Engineering A 495 (2008) 147–152 Wetting of pure aluminum and selected alloys on polycrystalline alumina and sapphire Andreas J. Klinter∗, Guillermo Mendoza-Suarez, Robin ...
— The wettability of pure aluminium on filter materials is believed to be an important factor affecting the filtration of aluminium. The contact angle of molten aluminium on graphite, alumina and ...
Figure 4. Change of contact angle vs. wetting time of liquid Al (900 C) on the cathode materials with various TiB 2 contents On the other hand, a chemical reaction to form carbide may
— 1.. IntroductionThe wetting of liquid metals on solid metals and non-metallic materials had been studied extensively since the early 1900s 1, 2.Of particular interest to materials scientists are the systems involving aluminum and aluminum oxide (Al 2 O 3), silicon carbide (SiC), and graphite.This is mainly because of the strong possibilities of …
In addition, the wetting angel of graphite with Al and high Aluminum Si alloys decreases intensively at temperatures higher than 1100 C [30]. Thus, Al addition to Si melt increases the melt ...
Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration Abstract ...
— Wetting between aluminium and Al3C4 (graphite) is determined in kinetic studies in the higher temperature range 1000–1200°C. ... The wettability of pure aluminium on filter materials is ...
— Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration. Sarina Bao K. Tang A. Kvithyld T. Engh M. Tangstad. Materials Science ... Materials Science. 2003; The wetting of alumina by pure liquid aluminum was investigated over the temperature range 900–1300°C by the sessile drop method under a dynamic vacuum of …
Light Metals 2009 Edited by: Geoff Bearne TMS (The Minerals, Metals & Materials Society), 2009 WETTING OF PURE ALUMINIUM ON FILTER MATERIALS GRAPHITE, AlF3 AND Al2O3 1 Sarina Bao1, Anne Kvithyld2, Sean Gaal2, Thorvald Abel Engh1, Merete Tangstad1 Norwegian University of Science and Technology, Trondheim, NO-7491, …
The variations with time of the contact angle formed by molten pure aluminium or Al-Si alloys with single crystalline SiC were measured by the sessile drop method in a vacuum of 10−4 to 10−5 Pa at temperatures ranging from 933 to 1200 K. In the Al/SiC system, a "non-wetting-wetting" transition was observed at a temperature that decreases as time …
— The wettability of molten aluminum on solid alumina substrate has been investigated by the sessile drop technique in a 10 8 bar vacuum or under argon atmosphere in the temperature range from 1273 ...
The aim of aluminium filtration is to remove inclusions such as Al3C4. For inclusions to be removed they have to come in close contact with the filter walls composed of Al2O3 or SiC. It is therefore important that the molten aluminium has close contact with the filter wall. In addition to wetting properties between inclusions (Al4C3) and molten aluminium, the …
In addition to wetting properties between inclusions (Al 4 C 3) and molten aluminium, the wettability of the filter (SiC) by aluminium is determined in sessile drop studies in the …
— Wetting angle,, was reduced by a factor as large as 2.8 for pure aluminium on reaction-bonded, compared with sintered silicon carbide, attributable to partial dissolution by the aluminium of the ...
The wetting behaviour of the Al-graphite (or Al-Al 4C 3) system will be investigated from the view point of inclusion-metal wettability in filtration. During the last few decades, several studies had been devoted to the wetting behaviour of the Al-graphite system. As a reactive wetting system, it is agreed that 1) the final or steady contact
Wetting angles of aluminium on graphite decreases to 85o at 1200 0C in our experiments during 5 minutes. ing of metal drops (fig. 2 a, b), further began caused probably by …
— The wetting of aluminium upon hot pressed TiB 2in vacuum was investigated by Rhee [8] and Samsonov [9]. ... In the present study the contact angles formed by aluminium on pure hot-pressed TiB 2 graphite,, carbonaceous cement and carbon/TiB2 composites in the presence of cryolite-alumina melts were determined. …
— The wettability of molten aluminum on solid alumina substrate has been investigated by the sessile drop technique in a 10−8 bar vacuum or under argon atmosphere in the temperature range from 1273 K to 1673 K (1000 °C to 1400 °C). It is shown that the reduction of oxide skin on molten aluminum is slow under normal …
DOI: 10.1016/S1003-6326(11)61410-6 Corpus ID: 206114519; Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration @article{Bao2012WettingOP, title={Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration}, author={Sarina Bao and Kai Tang and Anne Kvithyld and Thorvald Abel Engh and …
— The wettability of pure aluminium on filter materials is believed to be an important factor affecting the filtration of aluminium. ... Wetting between aluminium and Al3C4 (graphite) is determined ...
— Here, we prepared a novel aluminum-graphite (Al-Gr) composite, which was capable of high-efficient production of H2O2 through selective O2 reduction via a two …
Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration. Merete Tangstad. 2012, Transactions of Nonferrous Metals Society of China ...
— This indicates that the improved wetting of aluminium on a filter material is an advantage for molten metal to infiltrate the filter during priming. Also, better wetting of Al-filter might increase the removal efficiency of inclusions during filtration due to better contact between filter and metal. ... Wetting of pure aluminium on graphite ...
1-179 decreasing is caused by weak interaction of the molten metal with graphite [3,4]. It's also can be seen, that wetting angles for Al and Al-Ti alloy are in good coincidence.
The experiments were carried out using 99.999% pure aluminium and substrates produced from 98.9% single crystal SiC (Washington Mills, Norway) and ISO-88 Graphite substrates.
— Summary This chapter contains sections titled: Introduction Experimental Procedure Results Discussion Wetting in Filtration Conclusions Future Work Acknowledgment Wettability of Aluminium with SiC and Graphite in Aluminium Filtration - Light Metals 2011 - Wiley Online Library
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— In this study, Sn-Ag-Ti ternary alloy has been used as the active solder to braze pure aluminum and graphite in atmospheric conditions using ultrasonic vibration as an aid.
— The wettability of pure aluminium on filter materials and on inclusions is believed to be an important factor affecting the filtration of aluminium. The contact angles of molten aluminium on alumina, SiC and graphite were measured under 10−8 bar high vacuum in the temperature range of 1000–1300 °C. To describe the wetting behaviour of …
— The contact angles of molten aluminium on alumina, SiC and graphite were measured under 10 −8 bar high vacuum in the temperature range of 1000−1300 °C. To …
The wettability of pure aluminium on filter materials is believed to be an important factor affecting the filtration of aluminium. The contact angle of molten aluminium on graphite, alumina and AlF3 has been measured in 1 atmosphere of argon with an oxygen partial pressure of about 10-17 Pa in the temperature range of 1000-1800ºC.
Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration. Transactions of Nonferrous Metals Society of China, 22(8), 1930–1938. doi:10.1016/s1003 …
— The wetting and spreading of the aluminum melt on the graphite surface under ultrasonic field are simulated. Abstract In the preparation of an Al-Ti-C grain refiner under an ultrasonic field, the mechanism of the wetting behaviour between Al and C was systematically investigated.
— The wettability of molten aluminum-silicon alloys with silicon contents of 0, 6, 10, and 20 mass pct on graphite substrates by changing the placing sequence of …
The paper presents some aspects regarding the wetting conditions in aluminium – graphite composite. The wettability depends on several factors like the presence of the oxide skin at the melt surface, formation Al4C3 at the interface between Al and particles, temperature, pressure etc. In this paper, the conditions of perfect wettability of carbon by molten Al …
— The wettability of molten aluminum-silicon alloys with silicon contents of 0, 6, 10, and 20 mass pct on graphite substrates by changing the placing sequence of aluminum and silicon and the surface tension of those alloys were investigated at 1273 K (1000 °C) using the sessile drop method under vacuum. The results showed that the wetting was …
Sessile drop contact angles between liquid aluminum alloys and solid beryllium, boron carbide, and graphite were measured to 840°C under vacuum and in helium. Little wetting occurred between most of the combinations, but at 20% magnesium the contact angle on beryllium decreased to 68°. Low contact angles were noted for the binary aluminum …
Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration BAO Sarina 1, TANG Kai 2, Anne KVITHYLD, Thorvald ENGH 1, Merete TANGSTAD 1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, No-7491, Trondheim, Norway; 2. SINTEF Materials and Chemistry, No-7465, Trondheim, …
After ultrasonic vibration, the oxide layer was destroyed and the liquid solder was able to wet and spread out around the base materials. Furthermore, better wettability of the active solder was observed on the surface of graphite and pure aluminum at the brazing temperature of 773–823 K using ultrasonic waves.
