Direct nitridation of molten Al(Mg,Si) alloy to AlN

Jin, Haibo; Chen, K.; He-ping, Zhou; Agathopoulos, Simeon; Fabrichnaya, Olga; Ferreira, J.M.F.

doi:10.1016/j.jcrysgro.2005.04.024

Cited by 19 publications

(14 citation statements)

References 25 publications

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“…Pressure and concentration at the bubble surface are coupled through Henry's law (Equation 11) and mass balance (Equation 12). He is Henry's constant, where R is the ideal gas constant, T is the temperature, and D is the diffusion coefficient of nitrogen in aluminum whose dependence on temperature is expressed by Equation 13.…”

Section: Bubble Radiusmentioning

confidence: 99%

“…Moreover, its high thermal conductivity, high electrical resistance, low dielectric constant, and a thermal expansion coefficient similar to that of silicon make it a good candidate for thermal management applications, as well as for coatings, insulators and optoelectronic devices. 9,13 It must be pointed out that AlN powder is relatively expensive, and thus a deterrent when considering AlN/Al for cost-effective applications. Thus, in-situ fabrication of AlN/Al composites by the reaction of a nitrogen-bearing gas with molten Al is an attractive manufacturing route.…”

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confidence: 99%

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Aluminum nanocomposites for elevated temperature applications

Borgonovo

Apelian

Makhlouf

2011

JOM

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Research Summary aluminum: cast shop and alloys How would you… …describe the overall signifi cance of this paper? This paper describes a methodology and a conceptual framework to manufacture Al-based nanocomposites in a cost-effective way. It gives a pathway to make nanocomposites directly from melt. …describe this work to a materials science and engineering professional with no experience in your technical specialty? Al-based alloys cannot be used above 285°C as the precipitation hardening mechanism falls apart. Nano-composite Al alloys can be utilized at temperatures above 300°C which gives the opportunity to use them for a variety of elevated temperature applications. …describe this work to a layperson? Diesel engines are quite effective in that energy usage is less. Diesel is quite effective and gets excellent mileage (miles/gallon). However, diesel engines operate at higher temperatures than internal combustion engines. Al alloys fall short for many diesel applications as the Al does not maintain its strength at elevated temperatures. Nanocomposites open up a way for us to use Al for diesel applications.

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Section: Bubble Radiusmentioning

confidence: 99%

mentioning

confidence: 99%

Aluminum nanocomposites for elevated temperature applications

Borgonovo

Apelian

Makhlouf

2011

JOM

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“…13 In a few studies, AlN was successfully formed at 1273 K by adding an alloying element such as Li, Mg, or Si to Al. [14][15][16] Using Li, the nitridation of Al alloys can be induced at 1073 K under certain conditions. 17 However, this route is not suitable for the production of high-purity AlN because the removal of the nitride of alloying elements from AlN is difficult.…”

Section: B Production Of Aln From Al Metalmentioning

confidence: 99%

Production of aluminum nitride from aluminum metal using molten fluoride

et al. 2015

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The production of aluminum nitride (AlN) from aluminum metal was investigated in this study. The nitridation of Al (in rod, powder, and thin-plate forms) was facilitated by dissolving the Al 2 O 3 thin films formed on the Al samples with a molten fluoride mixture (KF-45 mol% AlF 3 , KF, or LiF-50 mol% KF). AlN was formed when NH 3 gas was supplied to the Al sample (in both solid and liquid forms) wetted by molten fluoride mixture. The lowest temperature at which AlN was successfully produced was 773 K. No AlN was formed when N 2 or H 2 -25% N 2 gas was supplied to the Al sample, even when a molten fluoride mixture was used. The reaction rate for the nitridation of Al powder increased with the temperature and reached 99% after 3 h at 1173 K. AlN thin films of 2-5 lm thickness were formed on Al thin plates (0.075-1.0 mm thick) at 873 K.

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“…Recently, P. Wu et al reported the AlN growth method using vaporized Al and nitrogen gas as source materials 10,11) . Some groups fabricated AlN by nitridation of metallic Al [12][13][14] . These techniques are simple, however, fabrication of high quality AlN bulk crystal have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of Growth Conditions on AlN Layer Grown by Ga-Al Liquid Phase Epitaxy

2017

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We developed an original liquid phase epitaxy technique that uses Ga-Al solution to grow AlN on surface nitrided sapphire substrates. In this paper, effects of temperature, solution composition, and N 2 gas ow rate on the growth of AlN layer were investigated. The AlN layer grown in the solution with higher Al content and higher growth temperature tended to dissolve into the solution, thus, the AlN layers exhibited inhomogeneous surface. The growth rate had a maximum at 60 mol%Al and at 1673 K for solution composition dependence and growth temperature dependence, respectively. On the other hand, the growth rate monotonically increased with increasing N 2 gas ow rate. Based on these results, growth mechanism and rate-determined step of this liquid phase epitaxy process were discussed.

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Direct nitridation of molten Al(Mg,Si) alloy to AlN

Cited by 19 publications

References 25 publications

Aluminum nanocomposites for elevated temperature applications

Aluminum nanocomposites for elevated temperature applications

Production of aluminum nitride from aluminum metal using molten fluoride

Effects of Growth Conditions on AlN Layer Grown by Ga-Al Liquid Phase Epitaxy

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