Transparent mullite ceramics from diphasic aerogels by microwave and conventional processings

Y. Fang, R. Roy, D. K. Agrawal, D. M. Roy

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Transparent mullite ceramics were developed by both microwave and conventional sintering of compacts starting with a diphasic aerogel near 1300°C. Both sintering processes were carried out in air at ambient pressure. The conventionally sintered sample was essentially non-crystalline, whereas the microwave sintered sample was highly crystalline mullite. Using a xerogel of the sane conposition, no transparency was achieved under the same conditions. The results indicate that the agglomeration-free microstructure of the starting aerogel was the key for achieving the transparency. The achievement of transparent mullite ceramics by microwave processing is attributed to the rapid-heating, accelerated-mullitization, enhanced densification, and limited grain-growth of the diphasic mullite gel in the microwave field.

Original languageEnglish (US)
Pages (from-to)11-15
Number of pages5
JournalMaterials Letters
Issue number1-3
StatePublished - Sep 1996

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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