Effects of Al<sub>2</sub>O<sub>3</sub> phase composition on AlON powder synthesis via aluminothermic reduction and nitridation

Qi, Jianqi; Wang, Ying; Xie, Xiumin; Wang, Yuezhong; Zhou, Jicheng; Wei, Nian; Wang, Jun; Wu, Di; Lu, Tiecheng

doi:10.3139/146.111032

Cited by 10 publications

(2 citation statements)

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“…Manufacturing of aluminum oxynitride ceramics usually starts with the synthesis of γ-AlON powder with one of the well-known methods, i.e., carbothermal reduction and nitridation (CRN) [ 7 , 8 , 9 , 10 , 11 ] or solid-state synthesis (SS) [ 12 , 13 , 14 , 15 ], or one less frequently used, such as aluminothermic reduction and nitridation (ARN) [ 16 , 17 ] or self-propagating high temperature synthesis (SHS) [ 18 , 19 , 20 , 21 , 22 ]. The main drawbacks of the most popular processes are high temperatures of over 1650 °C and prolonged soaking times.…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

2021

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This paper describes combusting loose powder beds of mixtures of aluminum metal powders and aluminum oxide powders with various grain sizes under various nitrogen pressure. The synthesis conditions required at least 20/80 weight ratio of aluminum metal powder to alumina powder in the mix to reach approximately 80 wt% of γ-AlON in the products. Finely ground fused white alumina with a mean grain size of 5 μm was sufficient to achieve results similar to very fine alumina with 0.3 μm grains. A lower nitrogen pressure of 1 MPa provided good results, allowing a less robust apparatus to be used. The salt-assisted combustion synthesis upon addition of 10 wt% of ammonium nitrite resulted in a slight increase in product yield and allowed lower aluminum metal powder content in mixes to be ignited. Increasing the charge mass five times resulted in a very similar γ-AlON yield, providing a promising technology for scaling up. Synthesis in loose powder beds could be utilized for effective production of relatively cheap and uniform AlON powder, which could be easily prepared for forming and sintering without intensive grounding and milling, which usually introduce serious contamination.

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Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

2021

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“…Compared with the CRN method, direct nitridation eliminates the problem of carbon residue. Besides AlN, AlON powders are also synthesized by direct nitridation of aluminum and Al 2 O 3 powder in flowing‐nitrogen atmosphere . However, to our best knowledge, little attention has been given to the synthesis of AlON in ammonia atmosphere, although better activity of ammonia is expected than that of nitrogen gas.…”

Section: Introductionmentioning

confidence: 99%

Preparation of γ‐aluminum oxynitride phosphor with Eu doping by direct nitridation in ammonia and postannealing

et al. 2018

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c-aluminum oxynitride (c-AlON) with spinel structure has attracted much attention for structural and functional application. c-AlON powders were successfully prepared by direct nitridation method of Al/Al(OH) 3 starting mixture in ammonia and then calcined at high temperature. XRD, SEM, TEM, EDX, and photoluminescence were conducted to investigate the detail procedure and the optical properties of AlON: xEu phosphors. Nitrogen was introduced by the nitridation of metallic aluminum, appropriate Al amount and nitridation condition was necessary to obtain phase pure c-AlON. The as-prepared AlON powders exhibited multifaceted grain morphology with fine particle size (1-5 lm). Eu 2 O 3 activator was reduced and transformed to EuAl 12 O 19 by reaction with alumina, which remained in the product when x > 0.25%. Under 331 nm excitation, AlON: xEu phosphors exhibited emission bands of 475 and 410 nm. 475 nm band reached a plateau at x = 0.25% due to the solubility of Eu 2+ ion in AlON, whereas 410 nm band showed a linear increase in intensity with Eu 2+ doping amount, which was believed to be the contribution of EuAl 12 O 19 . The present approach combination of direct nitridation in ammonia and postcalcination process showed potential application for AlON ceramic and AlON phosphors. K E Y W O R D S aluminum oxynitride, ammonia, direct nitridation, phosphor

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The Structurization of Aluminum Oxide Composite Ceramics Involving Products of Iron Oxide Reduction by Nanosized Nonstoichiometric Silicon Carbide

Timoshenko

Gadzira

2015

Powder Metall Met Ceram

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The paper studies the structurization of aluminum oxide ceramics sintered with additions of a synthesized fine SiC-Fe 2 O 3 powder alloy. The fine-grained powder alloy particles promote the densification of the alumina matrix. The mechanical properties of the composites are examined. The material obtained is tested as a cutting tool.Keywords: solid solution of carbon in silicon carbide, aluminum oxide, iron oxide, sintered iron ore concentrate, stishovite, cutting tool.

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Effects of Al₂O₃ phase composition on AlON powder synthesis via aluminothermic reduction and nitridation

Cited by 10 publications

References 11 publications

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

Preparation of γ‐aluminum oxynitride phosphor with Eu doping by direct nitridation in ammonia and postannealing

The Structurization of Aluminum Oxide Composite Ceramics Involving Products of Iron Oxide Reduction by Nanosized Nonstoichiometric Silicon Carbide

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Effects of Al2O3 phase composition on AlON powder synthesis via aluminothermic reduction and nitridation

Cited by 10 publications

References 11 publications

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

Preparation of γ‐aluminum oxynitride phosphor with Eu doping by direct nitridation in ammonia and postannealing

The Structurization of Aluminum Oxide Composite Ceramics Involving Products of Iron Oxide Reduction by Nanosized Nonstoichiometric Silicon Carbide

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Effects of Al₂O₃ phase composition on AlON powder synthesis via aluminothermic reduction and nitridation