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<p>Co-condensation of organoalumoxanes with Mg(acac)<sub>2</sub> and Cr(acac)<sub>3</sub> in a solution of EtOH was studied. The interaction of the components at a temperature of ∼70 °C and molar ratios Al/Mg = 2–150 and Al/Cr = 40–200 proceeds with the formation of soluble ceramic-forming chromium-containing magnesiumoxane alumoxanes, that is, precursors of chromium-modified aluminum magnesium ceramics. The introduction of a larger quantity of Cr(acac)<sub>3</sub> (Al/Cr &lt; 40) leads to the formation of crystals in the reaction mixture, which, according to scanning electron microscopy, have a probable composition Cr<sub>0.86</sub>Al<sub>0.11</sub>Mg<sub>0.03</sub>(acac)<sub>3</sub>. The thermal transformation of organochromiumoxane magnesiumoxane alumoxanes into ceramic phases at temperatures of 700, 900, and 1500 °C was studied. The obtained chromium-containing magnesiumoxane alumoxanes are precursors of components (matrix binders, fibers, coatings, powders, etc.) of chromium-modified ceramic composites with spinel and mixed spinel-corundum compositions.</p>

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Chromium-containing magnesiumoxane alumoxanes: properties of oligomers, specific features of synthesis and thermal transformation

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • G. I. Shcherbakova,
  • A. S. Pokhorenko,
  • M. S. Varfolomeev,
  • A. I. Drachev,
  • A. A. Ashmarin,
  • P. A. Storozhenko

摘要

Co-condensation of organoalumoxanes with Mg(acac)2 and Cr(acac)3 in a solution of EtOH was studied. The interaction of the components at a temperature of ∼70 °C and molar ratios Al/Mg = 2–150 and Al/Cr = 40–200 proceeds with the formation of soluble ceramic-forming chromium-containing magnesiumoxane alumoxanes, that is, precursors of chromium-modified aluminum magnesium ceramics. The introduction of a larger quantity of Cr(acac)3 (Al/Cr < 40) leads to the formation of crystals in the reaction mixture, which, according to scanning electron microscopy, have a probable composition Cr0.86Al0.11Mg0.03(acac)3. The thermal transformation of organochromiumoxane magnesiumoxane alumoxanes into ceramic phases at temperatures of 700, 900, and 1500 °C was studied. The obtained chromium-containing magnesiumoxane alumoxanes are precursors of components (matrix binders, fibers, coatings, powders, etc.) of chromium-modified ceramic composites with spinel and mixed spinel-corundum compositions.