Microwave (2.45 GHz)-assisted rapid sintering of SiO2-rich rice husk ash

Natt Makul, Dinesh K. Agrawal

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24 Scopus citations


The as-received SiO2-rich material, rice husk ash (RHA), was ground to a specific surface area (Blaine) of 4800 cm2/g and then was rapidly sintered by 2.45 GHz microwave energy using a multi-mode system. The sintering temperatures were in a range of 800-1200 °C. The morphology, phase composition, microstructure and reactivity were investigated by SEM, XRD, and hydration heat evolution and strength index. Results show that the sintered ground RHAs (SgRHAs) contain SiO2-cristolbalite and α-SiO2 as major phases. The bulk density is up to 0.98 kg/l, and strength index at 28 days of the 800 °C microwave-sintered RHA paste are up by 30% when comparing to the as-received ground RHA (gRHA).

Original languageEnglish (US)
Pages (from-to)367-370
Number of pages4
JournalMaterials Letters
Issue number3
StatePublished - Feb 15 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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