The wettability of titanium diboride by molten aluminum drops

Weirauch, Douglas A.; Krafick, W. J.; Ackart, G.; Ownby, P. D.

doi:10.1007/s10853-005-1949-0

Cited by 53 publications

(30 citation statements)

References 16 publications

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“…see Refs. [10][11][12][13][14][15][16] ). Although a good wetting of TiB 2 by liquid aluminium has been generally reported, the contact angle values as well as the temperatures are rather scattered.…”

Section: Introductionmentioning

confidence: 99%

“…Samsonov et al [11] did not observe any wetting of TiB 2 substrates (about 95 % of the theoretical density) by liquid aluminium at 900-1000°C in vacuum, whereas the contact angle decreased to about 75°and to about 30°after 20 min of isothermal heating at 1150°C and at 1250°C, respectively. Weirauch et al studied the wetting behaviour of liquid Al on different TiB 2 substrates at a constant temperature of 1025°C [12]. It was reported that the initial contact angle of about 120°-140°for liquid Al on a polished TiB 2 substrate (99.8 % or better purity, 99.7 % of the theoretical density) decreased to 0°after prolonged holding for 17 h.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Kaban

Nowak³

et al. 2015

J Mater Sci

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The wetting behaviour and interfacial interactions between liquid Al and TiB 2 ceramic have been studied by the sessile drop technique in the temperature range from 700 to 1400°C. At about 800°C, liquid Al starts to wet TiB 2 and at about 1000°C it completely spreads over the ceramic. Al 3 Ti and Al 2 O 3 are found to be the main phases precipitating at the interface. Starting from 1000°C, liquid Al either fill pores or penetrates along the grain boundaries of the TiB 2 ceramic. Scanning electron microscopy analysis of the interfaces evidences that the TiB 2 grains remain intact after the aluminium melt/ceramic interaction even at 1400°C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Kaban

Nowak³

et al. 2015

J Mater Sci

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“…Second, TiB 2 which is known to be strongly wetted by aluminum compared to SiC was preferred to overcome the potential poor wettability that can be encountered for Al/SiC composites. [35] B. Preparation of Tablets Containing Nanoparticles Aluminum powders with an average particle size of 60 lm and purity of 99.8 pct were mixed with, in a first trial, 14 wt pct of SiC and in a second trial, 16 wt pct of TiB 2 nanoparticles, by simply blending them by hand in a lab jar for 5 minutes.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Thixoforming of A356/SiC and A356/TiB2 Nanocomposites Fabricated by a Combination of Green Compact Nanoparticle Incorporation and Ultrasonic Treatment of the Melted Compact

Kandemir

Atkinson

Weston

et al. 2014

Metall Mater Trans A

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Thixoforming is a type of semi-solid processing which is based on forming metals in the semisolid state rather than fully liquid or solid state. There have been no reports of the thixoforming of nanocomposites in the literature. The incorporation of ceramic nanoparticles into liquid metals is a challenging task for the fabrication of metal matrix nanocomposites due to their large surface-to-volume ratio and poor wettability. Previous research work by a number of workers has highlighted the challenges with the incorporation of nanoparticles into liquid aluminum alloy. In the present study, SiC and TiB 2 nanoparticles with an average diameter between 20 and 30 nm were firstly incorporated into green compacts by a powder forming route, and then the compacts were melted and treated ultrasonically. The microstructural studies reveal that the engulfment and relatively effective distribution of the nanoparticles into the melt were achieved. The hardness was considerably improved with only 0.8 wt pct addition of the nanoparticles. The nanocomposites were successfully thixoformed at a solid fraction between 0.65 and 0.70. The microstructures, hardness, and tensile mechanical properties of the thixoformed nanocomposites were investigated and compared with those of the as-received A356 and thixoformed A356 alloys. The tensile properties of the thixoformed nanocomposites were significantly enhanced compared to thixoformed A356 alloy without reinforcement, indicating the strengthening effects of the nanoparticles.

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“…Ti was supposed to partially replace the reactions between Al and B4C and to introduce a new reaction product of TiB2 enclosing the entire B4C particles [25,152,160]. The Al was able to strongly wet TiB2 even at temperature below 1000 °C [161,162]. This process obviously enhanced the wettability of Al on the ceramic reinforcements.…”

Section: Matrix/reinforcement Interface In Ai-b4c Compositesmentioning

confidence: 99%

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

Lai¹

2011

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RESUMEDans cette étude, nous nous intéressons principalement au développement de la coulée, et au durcissement structrural des composites à matrice métallique AI-B4C pour des applications à haute temperature. Le scandium et le zirconium ont été introduits dans le système AI-B4C, comme éléments d'alliage, et leurs effets sur la microstrcture, la réponse au vieillissement, les propriétés mécaniques et la stabilité thermique ont été étudiés.Afin de réaliser cette étude, un microscope optique, un microscope électronique à balayage et un microscope électronique à transmission ont été utilisés dans le but d'observer la microstructure de brut de coulée et celle obtenue après vieillissement, d'analyser les réactions interfaciales, la distribution des éléments d'alliage entre l'interface et la matrice ainsi que pour examiner l'évolution des précipités lors de la couleé et le vieillissement.La réponse au vieillissement et le durcissement structural de la matrice ont été suivis par des mesures de dureté 'Vickers'. Les propriétés mécaniques et la stabilité thermique à long terme des composites contenant Se et Zr ont été évaluées en utilisant des essais de dureté Vickers et Rockwell ainsi que des essais de compression.Dans le premier chapitre de cette étude, des plaques de B4C ont été immergées dans l'aluminium liquide contenant Se, Zr et Ti afin d'étudier les réactions interfaciales entre le B4C et l'aluminium liquide. Les effets de Se, Zr et Ti à l'interface en terme d'apports individuels et combinés ont été examinés. Les résultats montrent que les trois éléments réagissent avec B4C et forment des couches interfaciales, qui agissent comme des barrières de diffusion, dans le but de limiter la décomposition du B4C dans l'aluminium liquide. Ainsi, les réactions interfaciales et les produits de réaction dans chaque système ont été identifiés. En combinant le Se, Zr et Ti, une grande quantité de Ti est enrichie à l'interface, qui non seulement offre une protection appropriée au B4C mais aussi une réduction de la consomation de Se et Zr à l'interface.Dans le second chapitre, le scandium et le zirconium ont été introduits dans le composite Al-15vol.% B4C, présaturé par Ti et huit composites à diférents teneurs en Se et Zr ont été préparés par couleé conventionelle. Il a été constaté que le scandium favorise les réactions interfaciales avec B4C qui consomme partiellement le Se. L'ajout de Se procure un durcissement structural considerable dans les conditions de couleé conventionnelle et du pic de veiellissement. Afin d'obtenir un durcissement equivalent de Se dans les alliages binaires, environ le double de la quantité de Se est nécessaire pour les composites AI-B4C. Par contre, aucun produit de réaction majeur de Zr n'a été trouvé aux interfaces. En effet, la majeure partie de Zr se concentre dans la matrice pour le durcissenent structurale. La combinaison de Se et Zr augmente de manière significative le durcissement structural. Deux types de précipités nanométriques, AI3SC et Al3(Sc, Zr), ont été observés dans la 11 microstructu...

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The wettability of titanium diboride by molten aluminum drops

Cited by 53 publications

References 16 publications

High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Thixoforming of A356/SiC and A356/TiB2 Nanocomposites Fabricated by a Combination of Green Compact Nanoparticle Incorporation and Ultrasonic Treatment of the Melted Compact

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

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