Reaction Sintering of MgAlON at 1500 °C from Al2O3, MgO and AlN and Its Wettability by AlSi7Mg

Schramm, Alina; Thümmler, Martin; Fabrichnaya, Olga; Brehm, Simon; Kraus, Jakob; Kortus, Jens; Rafaja, David; Scharf, Christiane; Aneziris, Christos G.

doi:10.3390/cryst12050654

Cited by 4 publications

(3 citation statements)

References 65 publications

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“…Lastly, Figure 11 displays the starting compositions (mole fractions) for the synthesis of MgAlON from selected literature sources [ 12 , 16 , 31 , 32 , 33 , 34 ] (a) and the starting compositions (mole fractions) for the synthesis of MgAlON used in this work (b), shown in a simplified diagram of the ternary MgO-AlN-Al 2 O 3 system.…”

Section: Resultsmentioning

confidence: 99%

“… Starting compositions (mole fractions) for the synthesis of MgAlON from selected literature sources [ 12 , 16 , 31 , 32 , 33 , 34 ] ( a ) and starting compositions (mole fractions) for the synthesis of MgAlON used in this work ( b ). …”

Section: Figurementioning

confidence: 99%

“…The synthesis of MgAlON is typically accomplished using the same methods employed for AlON powder synthesis. The main methods for obtaining MgAlON include solid-state reaction [ 8 , 9 , 11 , 12 , 13 , 14 , 15 , 16 ] and the carbothermal reduction of Al 2 O 3 in a nitrogen atmosphere [ 17 , 18 , 19 , 20 ]. In the solid-state reaction method, mixtures of AlN, Al 2 O 3 , and MgO powders are placed in a high-temperature furnace, and synthesis is carried out at temperatures above 1700 °C for several hours.…”

Section: Introductionmentioning

confidence: 99%

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Combustion Synthesis of Magnesium-Aluminum Oxynitride MgAlON with Tunable Composition

Akopdzhanyan,

Abzalov,

Moskovskikh

et al. 2023

Materials

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Magnesium-aluminum oxynitride MgAlON has garnered significant attention in recent years due to its unique properties and potential applications. Herein, we report a systematic study on the synthesis of MgAlON with tunable composition by employing the combustion method. The Al/Al2O3/MgO mixture was combusted in nitrogen gas, and the effects of Al nitriding and oxidation by Mg(ClO4)2 on the exothermicity of the mixture, combustion kinetics, and phase composition of combustion products were investigated. Our results demonstrate that the MgAlON lattice parameter can be controlled by varying the AlON/MgAl2O4 ratio in the mixture, which corresponds to the MgO content in the combustion products. This work provides a new pathway for tailoring the properties of MgAlON, which may have significant implications in various technological applications. In particular, we reveal the dependence of the MgAlON lattice parameter on the AlON/MgAl2O4 ratio. The limitation of the combustion temperature by 1650 °C resulted in obtaining submicron powders with a specific surface area of about 3.8 m/g2.

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Section: Resultsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combustion Synthesis of Magnesium-Aluminum Oxynitride MgAlON with Tunable Composition

Akopdzhanyan,

Abzalov,

Moskovskikh

et al. 2023

Materials

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Novel Ceramic Foam Filter Materials for the Filtration of Magnesium Alloy Melts

Schramm,

Aneziris,

Scharf

2024

Multifunctional Ceramic Filter Systems for Metal Melt Filtration

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Cleanliness of magnesium alloy melts plays an important role in producing high-quality, lightweight products exemplary for the automotive or aircraft industry with high-quality standards. Therefore, the applicability of ceramic foam filters in the active and reactive filtration of magnesium alloys was explored as an option of metallurgical refining. Carbon-bonded alumina foams were selected in their uncoated as well as variously coated states. To evaluate the applicability of selected ceramic filter materials, various tests were applied, investigating filter properties, interface interactions, melt cleanliness and wetting behavior of the filter, such as sessile drop tests, immersion and filtration tests, and metallographic evaluation of AZ91. Immersion tests in AZ91 at 680 °C for up to 60 min showed the durability of coated and uncoated Al2O3-C and the formation of finely-structured MgO in-situ layers on any alumina- or spinel-containing surfaces in contact with molten AZ91. These layers, resulting from interface reactions with the melt, are regarded to have the potential to attract and bind oxidic inclusions from the metallic melt during filtration, as AZ91 samples showed reduced inclusion amounts after their contact with Al2O3-C filters. Another milestone was the synthesis of MgAlON as a filter coating, proven to be resistant towards the reactive magnesium alloy melt.

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Structural and Thermodynamic Properties of Filter Materials: A Raman and DFT Investigation

Kraus,

Brehm,

Himcinschi

et al. 2024

Multifunctional Ceramic Filter Systems for Metal Melt Filtration

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The contribution focuses on the accurate prediction of heat capacities for intermetallics, the estimation of reaction paths for coated and uncoated alumina foam filters in contact with metallic melts, and the investigation of thermally induced changes in various filters and filtercomponents. Density functional theory (DFT) was able to provide isobaric heat capacities for Al–Fe and Al–Fe-Si systems that outclassed the empirical Neumann–Kopp rule and matched the experimental values over a wide temperature range. Moreover, DFT calculations clarified that the formation of hercynite at the interface between alumina filters and steel melt was the result of a solid-state reaction involving high concentrations of FeO. Ex-situ Raman spectroscopy was used to compare carbon-bonded alumina filters using different bindersfrom Carbores®P to environmentally friendly lactose/tannin, as a function of heat treatment. For these carbon-bonded filters, the prominent D and G bands were used to confirm the existence of graphitization processes and determine the size of graphite clusters resulting from these processes. In order to investigate the pyrolysis processes occurring in selected binder constituents of the lactose/tannin filters, the evolution of Raman spectra with temperature was analyzed via in-situ measurements. Wherever it was appropriate, experimental Raman data were compared with DFT-simulated spectra. Further, Raman spectroscopy was used to study the thermally induced formation of metastable alumina, helping to understand the structural changes that take place during the transformation of boehmite (γ-AlO(OH)) to corundum (α-Al2O3) via metastable transition phases: γ-Al2O3, δ-Al2O3, and θ-Al2O3.

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Reaction Sintering of MgAlON at 1500 °C from Al2O3, MgO and AlN and Its Wettability by AlSi7Mg

Cited by 4 publications

References 65 publications

Combustion Synthesis of Magnesium-Aluminum Oxynitride MgAlON with Tunable Composition

Combustion Synthesis of Magnesium-Aluminum Oxynitride MgAlON with Tunable Composition

Novel Ceramic Foam Filter Materials for the Filtration of Magnesium Alloy Melts

Structural and Thermodynamic Properties of Filter Materials: A Raman and DFT Investigation

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