Synthesis of Magnesium Aluminum Oxynitride by Carbothermal Reduction and Nitridation Process

Dai, Wei; Lin, Wei; 明良, 山口; 準治, 隠明寺; Yu, Jingkun; Zou, Zongshu

doi:10.2109/jcersj.115.42

Cited by 24 publications

(12 citation statements)

References 8 publications

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“…As reported by others, the firing temperature for monolithic MgAlON formation was 1650°C using CRN, 10 1650°C by a solid–gas reaction, 11 1675°C through a solid‐state reaction, 12 and 1700°C via SPS 8 . It can be seen from Fig.…”

Section: Resultssupporting

confidence: 60%

Synthesis and Oxidation Behavior of MgAlON Prepared from Different Starting Materials

Ye¹,

Shang²,

Zhang³

et al. 2010

Journal of the American Ceramic Society

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The formation and oxidation of magnesium–aluminum oxynitride (MgAlON) were investigated with emphasis on the effect of impurities through using synthetic raw materials and natural raw materials. It was observed that the formation of MgAlON was not much influenced by the starting materials, but MgAlON prepared from the natural starting materials exhibited accelerated oxidation. The different oxidation behaviors of MgAlON prepared from the different raw materials were discussed from the viewpoint of impurities in the materials. The formation temperature and oxidation temperature of MgAlON produced in this work were compared with those of MgAlON prepared using other processes.

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Section: Resultssupporting

confidence: 60%

Synthesis and Oxidation Behavior of MgAlON Prepared from Different Starting Materials

Ye¹,

Shang²,

Zhang³

et al. 2010

Journal of the American Ceramic Society

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“…On the other hand, according to the thermodynamic analysis, 7 it is known that evaporation occurs at high temperature and rapid heating process might be favor to decrease the effect. Though some efforts have been taken to decrease the evaporation of MgAlON, they are not so efficient because of their long soaking time at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Magnesium Aluminum Oxynitride

Dai

Yamaguchi²,

Lin³

et al. 2007

J. Ceram. Soc. Japan

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Oxidation behavior of spark plasma sintered SPS magnesium aluminum oxynitride MgAlON was investigated in this study. Monophase MgAlON without pores was easily obtained and evaporation was sufficiently limited by the utilization of the SPS process. The MgAlON powder was oxidized above 750? C, and a detectable mass gain of the MgAlON plate could not be obtained below 1200? C, because the oxidation reaction was of a very low level and occurred only on the surface. High temperature were favorable to oxidation reaction. According to the isothermal mass gain and evolution of oxidized morphology of the plates oxidized at different temperature, it could be deduced that the oxidation of MgAlON was limited by interface reaction. To analyze more profoundly, an oxidation model was proposed.

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“…Therefore, the spinel phase in specimens M 2 and M 3 is deduced to be MgAlON for the following reasons. First, MgAlON can exist above 1400°C under flowing nitrogen with a low oxygen partial pressure [19]. Second, it has smaller crystal lattice parameters than MgAl 2 O 4 and its diffraction peaks shift toward those of MgAl 2 O 4 .…”

Section: Methodsmentioning

confidence: 99%

“…AlON has two crystal structures [15,18]: wurtzite-structured AlN-polytypoids and spinel-structured AlON. However, AlON is only stable at (1640 ± 10)°C or higher temperatures and under a certain oxygen partial pressure and nitrogen partial pressure [19]. Because many of the foreseen applications of AlON correspond to this temperature region, this instability poses serious drawbacks on the actual applicability of the AlON non-oxide system.…”

Section: Introductionmentioning

confidence: 99%

In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

Tong

Yan

et al. 2017

Int J Miner Metall Mater

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Abstract:The Al-Al 2 O 3 -MgO composites with added aluminum contents of approximately 0wt%, 5wt%, and 10wt%, named as M 1 , M 2 , and M 3 , respectively, were prepared at 1700°C for 5 h under a flowing N 2 atmosphere using the reaction sintering method. After sintering, the Al-Al 2 O 3 -MgO composites were characterized and analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results show that specimen M 1 was composed of MgO and MgAl 2 O 4 . Compared with specimen M 1 , specimens M 2 and M 3 possessed MgAlON, and its production increased with increasing aluminum addition. Under an N 2 atmosphere, MgO, Al 2 O 3 , and Al in the matrix of specimens M 2 and M 3 reacted to form MgAlON and AlN-polytypoids, which combined the particles and the matrix together and imparted the Al-Al 2 O 3 -MgO composites with a dense structure. The mechanism of MgAlON synthesis is described as follows. Under an N 2 atmosphere, the partial pressure of oxygen is quite low; thus, when the Al-Al 2 O 3 -MgO composites were soaked at 580°C for an extended period, aluminum metal was transformed into AlN. With increasing temperature, Al 2 O 3 diffused into AlN crystal lattices and formed AlN-polytypoids; however, MgO reacted with Al 2 O 3 to form MgAl 2 O 4 . When the temperature was greater than (1640 ± 10)°C, AlN diffused into Al 2 O 3 and formed spinel-structured AlON. In situ MgAlON was acquired through a solid-solution reaction between AlON and MgAl 2 O 4 at high temperatures because of their similar spinel structures.

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Synthesis of Magnesium Aluminum Oxynitride by Carbothermal Reduction and Nitridation Process

Cited by 24 publications

References 8 publications

Synthesis and Oxidation Behavior of MgAlON Prepared from Different Starting Materials

Synthesis and Oxidation Behavior of MgAlON Prepared from Different Starting Materials

Oxidation Behavior of Magnesium Aluminum Oxynitride

In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

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