Synthesis Temperature Influence on the AlMgB14 Phase Composition
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The influence of the synthesis temperature on the phase composition, size distribution, and morphology of AlMgB14 particles, obtained by direct interaction of powders of elementary Al, Mg, and B with the addition of free carbon in vacuum 10 – 2 Pa at 1200 – 1400°C, was studied. The synthesized powders were analyzed by means of x-ray diffraction, SEM, EDX, and laser diffraction. The highest mass content of the main phase AlMgB14 (94%) was obtained at synthesis temperature 1200 – 1300°C with 1 h soaking. Impurity MgAl2O4 as well as magnesium-depleted spinel and AlB12 were recorded at soaking temperature above 1300°C.
Keywordsaluminum-magnesium boride synthesis light-density borides phase composition particle-size distribution nano-size powder
This work was supported by RFBR (contract No. 17-03-00863 A) and was performed using equipment from the Engineering Center at the St. Petersburg State Institute of Technology (Technological University).
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