Oxidation Behavior of Magnesium Aluminum Oxynitride

Dai, Wei; Yamaguchi, Akira; Lin, Wei; Ommyoji, Junji; Yu, Jingkun; Zou, Zongshu

doi:10.2109/jcersj.115.195

Cited by 10 publications

(11 citation statements)

References 11 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: 63%

“…Different approaches have been used for the synthesis of MgAlON. Dai et al 8,9 . prepared MgAlON using spark plasma sintering (SPS) at 1700°C in an N 2 atmosphere with MgO, Al 2 O 3 , and AlN as the starting materials.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there has been increased interest in the oxidation behaviors of MgAlON in recent years. It was found that oxidation of MgAlON powder started at about 750°C, 8,11 even if the oxidation rate of MgAlON was very slow below 1000°C 13 . Although the oxidation rate increased dramatically above 1000°C from the mass gain results of the MgAlON oxidation test, X‐ray powder diffractometry (XRD) results showed that only monolithic MgAlON was observed at different oxidation temperatures up to 1100°C 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Only at 1200°C or above, was another phase of α‐Al 2 O 3 detected in the oxidized product besides the cubic spinel crystalline phase 13,14 . The overall oxidation behavior of MgAlON follows 8 MgAlON+O 2 →MgAl 2 O 4SS +Al 2 O 3 +N 2 . It was also observed 13 that variation in the composition of the MgAlON solid solution did not exert a noticeable influence on the onset oxidation temperature and the temperature at which α‐Al 2 O 3 began to appear.…”

Section: Introductionmentioning

confidence: 99%

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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: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…In addition, we have obtained an excess weight change during the oxidation of MgAlON powder in the previous study. 3 But, the effect of chemical composition on density and oxidation behavior has not been mentioned in the earlier reports.…”

mentioning

confidence: 95%

Oxidation Behavior of Magnesium Aluminum Oxynitride with Different Composition

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 with different composition was investigated in present work. Results showed that the variation in composition had not obvious effect on the density of MgAlON, but had some effect on excess weight change. Also found that the oxidation behavior of MgAlON was different with oxidation temperature, which was attributed to the transformation from g-Al 2 O 3 to a-Al 2 O 3 . Moreover, the excess weight change was ascribed to the existence of lots of vacancies in g-Al 2 O 3 and magnesium aluminate spinel MgAl 2 O 4 ss .

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Immersion Testing of Variously Coated Ceramic Foam Filters in an AZ91 Magnesium Melt

et al. 2021

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Due to its low density, high specific strength, and resource availability, magnesium and its alloys, such as AZ91, have a high potential for various lightweight applications. [1][2][3] A major hindrance for its widespread processing and use is its high reactivity, contributing to high dross-and sludge formation in the melt, which results in the metal being prone to corrosion and containing high quantities of nonmetallic inclusions, if the handling of the melt has not been accurate. The inclusions can be divided into oxide films, lumps, and clusters, as well as intermetallic particles; gas-and shrinkage pores, may also be present. [1][2][3][4][5] While measures are taken to protect and cleanse magnesium melts on industrial scale, such as gas purging treatments by Ar, N 2 , or Cl 2 , the usage of a variety of possible cover gases or fluxes and the optimization of the casting system toward a high grade of enclosure, [1,6] the application of ceramic foam filters is seen as a promising method for cleansing the melt and improving the mechanical properties of the casting. [7][8][9] Ideally, an auxiliary addition of fluxes would be avoided, while delivering the same quality of melt cleanliness. [10][11][12] Wu et al. emphasized the effectiveness of ceramic foam filters made from MgO or Al 2 O 3 in AZ91, improving the elongation-to-failure of cast samples up to relative 58%. [13] In contrast to oxidic, sintered filters, carbon-bonded ceramic foam filters show higher resistance toward thermal shock and creep deformation, as well as lower energy consumption during their manufacture, due to their lower manufacturing temperature. [14] After carbon-bonded alumina filters showed promising results in the filtration of steel melts, [15] short-term immersion tests in AZ91 have been carried out to evaluate their applicability in a magnesium alloy melt. Interface reactions between the AZ91 melt and variously coated ceramic Al 2 O 3 -C filters have been investigated after immersion times of 10-120 s. [16] The investigated filter coatings consisted of Al 2 O 3 , MgO-C, MgAl 2 O 4 , or carbon nanotubes/ alumina nanosheets. The formation of MgO in situ layers was shown on filter surfaces containing Al 2 O 3 or MgAl 2 O 4 . [16] Therefore, the next step toward assessing the applicability of oxidic as well as carbon-bonded ceramic foam filters in the field of magnesium melt filtration is the evaluation of their long-term resistance toward the magnesium melt, with a special regard toward melt contamination and inclusion content.In this study, additional ceramic foam filter materials, namely ZrO 2 [13] and MgAlON, [17] were added to the selected materials

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Oxidation Behavior of Magnesium Aluminum Oxynitride

Cited by 10 publications

References 11 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 with Different Composition

Immersion Testing of Variously Coated Ceramic Foam Filters in an AZ91 Magnesium Melt

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