Synthesis of aluminum-magnesian ceramics MgAl2O3 in thermal plasma environment
https://doi.org/10.31675/1607-1859-2022-24-3-138-146
Abstract
A search for new methods for the synthesis of magnesium-aluminum ceramics is currently an urgent task for the refractory, metallurgical, and optical industries. The paper presents the experimental results of the magnesium-aluminum spinel MgAl2O3 synthesis in the thermal plasma. The samples are synthesized from natural materials such as magnesite MgCO3 and boehmite γ-AlO(OH) in the stoichiometric ratio Al2O3/MgO = 2.53. It is shown that the optimum conditions for the ceramic sample synthesis include 100 A current strength, 90 V voltage, 1 g/s gas rate, 30 s melting time. In these conditions, the formation of a hemispherical melt drop is observed, which confirms a complete melting of the initial components. The density of the crystallized sample is 3.5 g/cm3. The synthesized ceramic matrix is characterized by a high concentration of the stoichiometric phase MgAl2O4. At the same time, for 2θ = 29.4° and 30.8°, the reflection splits, thereby indicating to the nonstoichiometric spinel (Mg, Al)Al2O4 of variable composition. The ceramic matrix morphology represents prismatic grains 30–60 µm in size connected by fibers with a diameter of 1–3 µm.
About the Authors
V. V. Shekhovtsov
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Valentin V. Shekhovtsov - PhD, Assistant Lecturer, Tomsk State University of Architecture and Building.
2, Solyanaya Sq., 634003, Tomsk.
N. K. Skripnikova
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Nelli K. Skripnikova - DSc, Professor, Tomsk State University of Architecture and Building.
2, Solyanaya Sq., 634003, Tomsk.
A. B. Ulmasov
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Akhrorbek B. Ulmasov - Graduate Student, Tomsk State University of Architecture and Building.
2, Solyanaya Sq., 634003, Tomsk.
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Review
For citations:
Shekhovtsov V.V., Skripnikova N.K., Ulmasov A.B. Synthesis of aluminum-magnesian ceramics MgAl2O3 in thermal plasma environment. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture. 2022;24(3):138-146. (In Russ.) https://doi.org/10.31675/1607-1859-2022-24-3-138-146
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