Porous mullite ceramics through diphasic gels of large boehmite and small silica particles

Ladislav Pach, Sridhar Komarneni, Chunling Liu

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Abstract

Mullite formation process has been studied in stoichiometric mullite (3Al2O3·2SiO2) diphasic gel containing large boehmite (∼1 μm) and small silica (∼10 nm) particles. It has been found that initial mullitization did not take place inside the silica phase (cristobalite), but took place in the defect θ-alumina phase. θ-alumina was stabilized by silica when the temperature was below 1350°C. At temperatures above 1350°C, mullite crystallized directly. It was suggested that silica diffused into the pores (<1.8 nm) of θ-alumina and prevented the collapse of θ-alumina pore structure. On the other hand, when silica was not present, the pore structure of θ-alumina collapsed and α-alumina crystallized at ∼1100°C. Porous mullite ceramics were obtained by using special diphasic gels containing large boehmite and small silica particles.

Original languageEnglish (US)
Pages (from-to)155-163
Number of pages9
JournalJournal of Porous Materials
Volume1
Issue number2
DOIs
StatePublished - Sep 1 1995

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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