The effect of carbon on wetting of aluminum oxide by aluminum

Weirauch, Douglas A.; Krafick, W. J.

doi:10.1007/bf02672591

Cited by 34 publications

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“…Generally to solve the oxidation problem a diffusion pump is attached to the system and oxygen partial pressure reduced to 10~7-10~9 atm [Contreras et al, 2001;Toy et al, 1997;Weirauch et al, 1990;Schoennahl et al, 1984;Landy et al, 1997;and Nizhenko et al, 2001]. It is also important to control the experimental environment to achieve practically sound results [Saiz et al, 1999].…”

Section: Oxidationmentioning

confidence: 99%

Investigation on wetting of B4C by aluminum alloys /

Sarkar¹

2009

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Aluminum-B4C composites (MMC) gained importance in aluminum industry because it can be used in high performance applications such as radioactive nuclear waste storage, aircraft and aerospace structures due to its neutron shielding capacity, light weight, high strength, and stiffness. It is difficult to mix B4C powder with liquid aluminum to produce composites due to poor wettability of B4C. In addition, B4C is not stable when it is in contact with aluminum. The optical microscopy and scanning electron microscopy analyses of the interface revealed the formation of AI3BC and AÎB2 particles around the B4C particle. This reaction is continuous and results in the depletion of B4C concentration, decrease in the fluidity of the melt, and deterioration in its mechanical and physical properties. To prevent B4C loss, titanium is added to aluminum. Ti has affinity to react with B4C and forms a protective layer around the particle.Objectives of this project are to investigate the wettability of B4C/aluminum and B4C/aluminum-titaniurn alloy systems, and to identify other potential alloying elements to protect B4C. The sessile-drop experiments have been conducted to measure the contact angles of B4C as well as those of the interfacial reaction products forming due to the presence of alloying elements in aluminum. Also, the effect of Ti content on the wettability of B4C by aluminum was studied.The results of the experiments show that the titanium and zirconium addition to aluminum has a strong positive effect on wetting between B4C particles and the liquid metal. In order to understand the effects of the reaction products on wetting, the contact angles between the reaction products (TiC, T1B2, AIB2 and AI4C3 particles) and aluminum have been measured at 750°C and 850°C. The results also show that wetting increases with increasing temperature and contact time.It is found out that with Ti addition, AIB2 particles disappear and new Ti-rich needle-like particles (TiB?) are formed around the B4C particles. These act as a barrier layer which isolates the B4C from the aluminum matrix. It is also observed that with increasing Ti content, the formation of AI3BC decreases. However, further increase in Ti content causes

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Section: Oxidationmentioning

confidence: 99%

Investigation on wetting of B4C by aluminum alloys /

Sarkar¹

2009

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“…The control of the atmosphere has a key role to achieve practically sound results [42]. For this purpose, generally a diffusion pump is integrated into the system, and the oxygen partial pressure is dropped down to 10" 7 -10" 9 atm [34,37,38,40,41,44], and the experiments are conducted under an inert atmosphere. Most of the scientists used an inert Ar [37,41,42] atmosphere; however, some of them tried different gas atmospheres.…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

“…First, various solid substrates with different surface characteristics can be tested. Although this method is designed basically for testing the wettability of rigid, insoluble, homogenous, and smooth solid substrates, it is also possible to investigate the effect of surface roughness, chemical reactions taking place along the metal alloy/substrate interface, and temperature [38,40,41] on the wettability of the substrate. Second, testing can be done using small quantities of liquid, and finally it is possible to conduct tests at elevated temperatures with acceptable accuracy and good repeatability.…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

“…Many scientists used aluminum [36,37,38,39] or aluminum alloys [34,39,40,41] for testing the wettability of certain substrates. Among the alloys tested there arc binary alloys like Al-Si [34,39,40], Al-Cu [40], Al-Ni [40], and Al-Mg [34], ternary alloys like Al-MgSi [34] and Al-Cu-Mg [39], and four-component alloys like Al-Cu-Mg-Mn [41].…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

“…Different researchers investigated the wettability of various polished substrates [36,37,44] like SiC [36,39], A1N [37], alumina [34,42,43], polycor (99.7% alumina, 0.3% MgO) [40], corundum (94.87% alumina) [40], sapphire [38], copper oxide coated alumina [45], carbon coated sapphire [38], vitreous carbon [44], graphite [38], TiC [41], zirconia [34], titania [34], silica [34], silicon nitride bonded silicon carbide (Refrax) [39].…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

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Étude de la mouillabilité des particules granulaires par les alliages d'aluminium durant la filtration d'aluminium /

Ergin¹

2006

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SUMMARYThis thesis was undertaken to study the wetting between granular media (alumina) and Al-Mg alloys. The objective was to develop a test method to characterize different granular alumina particles and differentiate one from the other by using the wettability concept. Two types of experimental methods were used to measure the wetting: sessile drop and infiltration methods.The sessile drop system constructed is one of the few, if not the only one, available in Canada in which the contact angle measurements can be carried out with a liquid metal drop injected directly onto the solid surface. However, the results indicated that this method is not appropriate to differentiate different granular alumina particles due to prevention, by the rough surface, of the droplets taking their proper form.Using the infiltration system, various alumina particles were tested. The data obtained from these tests were analyzed using three capillary models based on: (i) an energy balance with an average pore size, (ii) an energy balance with a pore size distribution, and (iii) a force balance with periodically changing pore radius. The two models based on the energy balance were developed especially for infiltration experiments, and the third one was taken from the literature. The results were consistent and showed that it was possible to differentiate different alumina samples with the infiltration method. The reactions taking VI place between Al-Mg alloys and different alumina particles were also investigated by using the infiltration technique. SEM and TEM analyses showed that spinel was formed independent of the experiment duration and the type of alumina particles used in the experiments at 1000 K under argon atmosphere. The theraiodynamic analysis indicated the same tendency.

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Enhanced Wetting of Carbon‐Coated Alumina Substrates by Aluminum Alloys

Rocha–Rangel¹,

Becher

2006

Ceramic Transactions Series

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The effect of carbon on wetting of aluminum oxide by aluminum

Cited by 34 publications

References 13 publications

Investigation on wetting of B4C by aluminum alloys /

Investigation on wetting of B4C by aluminum alloys /

Étude de la mouillabilité des particules granulaires par les alliages d'aluminium durant la filtration d'aluminium /

Enhanced Wetting of Carbon‐Coated Alumina Substrates by Aluminum Alloys

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