Combustion synthesis of rod-like AlN nanoparticles

Shi, Zhongqi; Radwan, Mohamed; Kirihara, Soshu; Miyamoto, Yoshinari; Jin, Zhihao

doi:10.2109/jcersj2.116.975

Cited by 15 publications

(12 citation statements)

References 26 publications

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“…24) It has also been previously reported that when MgO is added to the raw materials for the combustion synthesis of AlN, AlN nanowires with MgAlON droplets on the tips are formed, suggesting VLS growth. 25) Similarly to these previous studies, VLS growth of AlN occurred in our DTF experiments. Figure 10(d) shows the proposed formation mechanism for radially grown AlN fibers obtained in a DTF using a mullite tube.…”

Section: Results Obtained Using the Mullite Reactor Tube (1400°c)supporting

confidence: 87%

Synthesis of AlN particles via direct nitridation in a drop tube furnace

Saito

Senda

Abé

et al. 2019

J. Ceram. Soc. Japan

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We propose a facile and continuous direct nitridation method for synthesizing fine aluminum nitride (AlN) particles using a drop tube furnace. Aerosolized Al powder as the raw material was continuously supplied through the top of the furnace together with N 2 as a carrier gas. Once in the furnace, the Al powder reacted with the N 2 to form AlN. A particular advantage of this process is that it allows the continuous synthesis of fine AlN particles. In this study, either a mullite (Al 2 O 3 SiO 2) or an alumina tube was used to fabricate the furnace, and the products were collected in a crucible placed at the bottom. Upon heating the mullite tube from 1200 to 1400°C, AlN was formed once the temperature exceeded 1250°C, and its product content increased with temperature. When the flow rate of the N 2 carrier gas was decreased from 4 to 2 L min ¹1 , the amount of AlN formed increased due to the increased residence time in the reactor. The morphology of the particles obtained was radially aligned nanofibers with droplets on the tips of the fibers. Transmission electron microscopy revealed that the Si in the mullite tube reacted with Al to form eutectic AlSi droplets on the Al surface, in which these droplets acted as a catalyst of vaporliquidsolid AlN fiber growth. When the alumina tube was used (1800°C), nitridation of Al was enhanced and radially aligned AlN nanofibers with no droplets on the tips were collected, mainly in a filter at the exhaust port. These AlN nanofibers are thought to form via vaporsolid growth and are easily carried along with the N 2 gas flow, resulting in their deposition on the filter. The products collected in the crucible contained coarse Al particles, which are formed via Al particle agglomeration and coarsening through melting.

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Section: Results Obtained Using the Mullite Reactor Tube (1400°c)supporting

confidence: 87%

Synthesis of AlN particles via direct nitridation in a drop tube furnace

Saito

Senda

Abé

et al. 2019

J. Ceram. Soc. Japan

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“…6(a) that AlN(s) is stable up to about 2400 K, which is in well agreement with the reports in the literature $ 2400 K [9,11,15]. AlN(s) starts dissociating above 2400 K into its elemental constituents Al and N. Reported gas phase exothermic formation and endothermic dissociation reactions of AlN [35] are Al(g)þN(g)-AlN(g); AlN(g)-AlN(s); Al(l)þN-AlN(s); AlN(g)-Al(g)þN 2 (g) here reaction of Al(l) with N is endothermic in nature; which absorbs heat from plasma source and reduces the surface temperatures, which stop the further growth of AlN(s). Moreover part of AlN(g) phase species condense on the stable AlN(s) phase at the boundaries and become part of it.…”

Section: Growth Mechanismsupporting

confidence: 90%

Understanding the growth of micro and nano-crystalline AlN by thermal plasma process

Kanhe

Nawale

Gawade

et al. 2012

Journal of Crystal Growth

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“…In previous studies, we have reported the synthesis of AlN nanowhiskers [20,21], porous-shell hollow spheres [22] and rod-like nanoparticles [23] with uniform morphologies by the CS method. The morphology of the products can be controlled through adjusting the CS parameters (such as diluent content and N 2 pressure) and…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

Wei

et al. 2020

Preprint

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Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 µm were successfully synthesized via an in-situ combustion synthesis method. The effect of N2 pressure, NH4Cl content and Al particle size on the combustion reaction procedure, phase composition and microstructure of the products was systematically investigated. The results showed that the decreased N2 pressure, increased NH4Cl content and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N2 pressure (0.2 MPa), a small amount of NH4Cl (0.5 wt%) and fine Al particles (~ 2.5 µm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

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Combustion synthesis of rod-like AlN nanoparticles

Cited by 15 publications

References 26 publications

Synthesis of AlN particles via direct nitridation in a drop tube furnace

Synthesis of AlN particles via direct nitridation in a drop tube furnace

Understanding the growth of micro and nano-crystalline AlN by thermal plasma process

Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

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