Synthesis of fine AlN powder by a floating nitridation technique using an N2/NH3 gas mixture

Kimura, Ikuo; Ichiya, Kenji; Ito, Masahiro; Hotta, Noriyasu; Kitamura, Teruo

doi:10.1007/bf00725505

Cited by 58 publications

(18 citation statements)

References 2 publications

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“…If some carbon reacts with water vapour generated by reaction (12) at temperatures above 600°C, according to reaction (13), the per cent weight loss of the as synthesised sample before decarburisation would be higher than that of the theoretical value. When the A7-C2 mixture (Al(OHh/ C = 1: 3) was reacted at 1500°C for 60 min, however, the per cent weight loss value was 48·26% which is in very good agreement with the theoretical value (48·25%).…”

Section: Effect Of Aluminium Oxide Sourcementioning

confidence: 91%

“…Catalysts such as alkali metal fluorides have been reported 10,11to be able to overcome this problem but residual impurities were difficult to avoid. In the development of nitridation process design, Hotta et al 12 and Kimura et al 13 synthesised very fine « 1 Jlm) AIN powder by a 'floating nitridation technique' using a mixture of nitrogen and ammonia instead of pure nitrogen. Hotta et al 12 claimed that they obtained a transparent AIN body by hot pressing the AIN powder at 1900°C without any sintering additive.…”

Section: Direct Nitridation Of Aluminiummentioning

confidence: 99%

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Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 3 Aluminium nitride

Cho¹,

Charles²

1991

Materials Science and Technology

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It has beenfound that the reaction rate between alumina and carbon in nitrogen can be considerably increased by using AI(OH)3-C mixtures instead ofll. in the starting mixtures should be greater than the stoichiometric ratio to complete the reaction. It was observed that alumina is reduced and nitrided to form aluminium nitride via spinel type aluminium oxynitride which is an intermediate compound. The overall reaction rate increased with decreasing AI(OH)3particle size and increasing nitrogenjlowrate.It is thought that thefaster reaction rates obtainedfrom AI(OH)3-C mixtures were derivedfrom the high specific surface area of transition aluminas, such as y A1 2 0 3 , whichformed during heating of the samples to the reaction temperature. The particle morphologies of the Al (0 H) 3 powders did not change during the reduction and nitridation reaction, an important attribute to the process.MSTj1346c

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Section: Effect Of Aluminium Oxide Sourcementioning

confidence: 91%

Section: Direct Nitridation Of Aluminiummentioning

confidence: 99%

Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 3 Aluminium nitride

Cho¹,

Charles²

1991

Materials Science and Technology

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“…Figure 7 shows the microstructure of the collected particles in which the egg-shell structure is clear. It was mentioned in the reports of nitriding of Al particles ( Ref 33,34,[48][49][50] that presence of egg-shell structure is a characteristic feature of formation AlN through the direct nitridation of Al. In which, the nitriding reaction occurs via three steps (Ref [48][49][50]:…”

Section: Nitriding Reaction Of Al Powdermentioning

confidence: 97%

Cubic Aluminum Nitride Coating Through Atmospheric Reactive Plasma Nitriding

et al. 2010

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Aluminum nitride is a promising material for structural and functional applications. Cubic AlN (c-AlN) is expected to have higher thermal conductivity due to their high symmetry; however, its fabrication is difficult. In this study, c-AlN was synthesized by atmospheric plasma spray process through the reaction between Al feedstock powder and nitrogen plasma. Al powders were supplied to the plasma stream by Ar carrier gas and reacted with surrounding N 2 plasma, then deposit onto substrate. The obtained coatings were c-AlN/Al mixture at 150 mm of spray distance, and the nitride content was improved by increasing the spray distance. The coatings almost consist of c-AlN at 300 mm of spray distance. The coatings thickness decreased from 100 to 10 lm with increasing spray distance from 150 to 300 mm. Using carrier gas, N 2 enable to fabricate thick c-AlN coating with hardness 1020 Hv.

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“…10 This reduction was believed to be due to the formation of reactive atomic nitrogen. A mixture of 5% of NH 3 in nitrogen was reacted with a powder bed 75 mm deep.…”

Section: (6) Effect Of Nh 3 Additionmentioning

confidence: 99%

Combustion Synthesis of Aluminum Nitride Particles and Whiskers

Bradshaw

Spicer

1999

Journal of the American Ceramic Society

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Aluminum nitride (AlN) was produced via the combustion synthesis of loosely packed aluminum powder (pore fraction of ∼0.8) in a graphite reactor that was lined with permeable carbon felt. Almost-complete conversion was achieved with a forced flow of nitrogen for beds 50-150 mm deep (mass of 200-650 g). The product was in the form of a loosely aggregated bed, with regions of distinct morphology, and had a predominantly whisker morphology. Some control over the microstructure was possible by changing the processing parameters. The addition of 5% of ammonia to the nitrogen resulted in a uniform production of whiskers, whereas a 50% solid-phase dilution with AlN favored the production of particles.

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Synthesis of fine AlN powder by a floating nitridation technique using an N2/NH3 gas mixture

Cited by 58 publications

References 2 publications

Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 3 Aluminium nitride

Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 3 Aluminium nitride

Cubic Aluminum Nitride Coating Through Atmospheric Reactive Plasma Nitriding

Combustion Synthesis of Aluminum Nitride Particles and Whiskers

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