Aluminum oxynitride by SHS under high pressure of nitrogen gas

Akopdzhanyan, T. G.; Borovinskaya, I. P.; Chemagina, E. A.

doi:10.3103/s1061386217020029

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Rietveld refinement was performed on XRD patterns t o calculate the lattice parameters of analysed phases. More information about combustion experiments is presented elsewhere [14,15].…”

Section: Alon Powder Synthesismentioning

confidence: 99%

Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis

Akopdzhanyan¹,

Kondakov²,

Рупасов³

et al. 2021

physics

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The synthesis method of aluminium oxynitride (AlON) powders by nitriding of Al/Al2O3 mixture under highpressure nitrogen is proposed. The novelty of this method consists in adding KClO4 or Mg(ClO4)2 and extra Al into the starting mixture (Al+Al2O3) to cause the exothermal aluminium oxidation reaction, which therefore initiates the aluminium nitriding reaction. The microstructure and phase composition of the AlON powders obtained by self-propagating high-temperature synthesis are demonstrated by means of SEM and XRD analysis. Diffuse reflection spectra of AlON powders have been measured and the values of band-gap energy have been calculated. Optical transmission and reflection characteristics of the AlON ceramic samples sintered from AlON powders at 1930°C have been studied. The influence of the technological parameters of ceramics production on their transparency is revealed – the most transparent sample is obtained from the powders synthesized with the Mg(ClO4)2 additive and sintered for 6 h.

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“…Rietveld refinement was performed on XRD patterns t o calculate the lattice parameters of analysed phases. More information about combustion experiments is presented elsewhere [14,15].…”

Section: Alon Powder Synthesismentioning

confidence: 99%

Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis

Akopdzhanyan¹,

Kondakov²,

Рупасов³

et al. 2021

physics

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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%

“…All samples were composed mostly of γ-AlON with impurities consisting of Al (in low nitrite sample), 21R, and AlN (in high nitrite sample). Another approach with an oxidizer was conducted by Akopdzhanyan et al [ 22 ]. The proportion of Al/Al 2 O 3 was fixed at 21/79 and 25/75 wt% with up to a 17 wt% addition of Mg(ClO 4 ) under 5–100 MPa N 2 pressure.…”

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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AlON transparent ceramics from powders synthesized by improved direct nitridation

Yang,

Zhang,

et al. 2023

Ceramics International

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Aluminum oxynitride by SHS under high pressure of nitrogen gas

Cited by 6 publications

References 8 publications

Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis

Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis

Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

AlON transparent ceramics from powders synthesized by improved direct nitridation

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