Microwave sintering of alumina at 2.45 GHz

Kristen H. Brosnan, Gary Lynn Messing, Dinesh Kumar Agrawal

Research output: Contribution to journalArticle

137 Citations (Scopus)

Abstract

The sintering kinetics and microstructural evolution of alumina tubes (∼17 mm length, ∼9mm inner diameter, and ∼11 mm outer diameter) were studied by conventional and microwave heating at 2.45 GHz. Temperature during microwave heating was measured with an infrared pyrometer and was calibrated to ±10°C. With no hold at sintering temperature, microwave-sintered samples reached 95% density at 1350°C versus 1600°C for conventionally heated samples. The activation energy for microwave sintering was 85 ± 10 kJ/mol, whereas the activation energy for conventionally sintered samples was 520 ± 14 kJ/mol. Despite the difference in temperature, grains grew from ∼1.0 μm at 86% density to ∼2.6 μm at 98% density for both conventional sintered and microwave-sintered samples. The grain size/density trajectory was independent of the heating source. It is concluded that the enhanced densification with microwave heating is not a consequence of fast-firing and therefore is not a result in the change in the relative rates of surface and grain boundary diffusion in the presence of microwave energy.

Original languageEnglish (US)
Pages (from-to)1307-1312
Number of pages6
JournalJournal of the American Ceramic Society
Volume86
Issue number8
DOIs
StatePublished - Jan 1 2003

Fingerprint

Aluminum Oxide
aluminum oxide
Microwave heating
Alumina
Sintering
Microwaves
Activation energy
heating
Pyrometers
Microstructural evolution
activation energy
Densification
Temperature
Grain boundaries
Trajectories
Infrared radiation
Heating
temperature
Kinetics
grain boundary

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

Brosnan, Kristen H. ; Messing, Gary Lynn ; Agrawal, Dinesh Kumar. / Microwave sintering of alumina at 2.45 GHz. In: Journal of the American Ceramic Society. 2003 ; Vol. 86, No. 8. pp. 1307-1312.
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abstract = "The sintering kinetics and microstructural evolution of alumina tubes (∼17 mm length, ∼9mm inner diameter, and ∼11 mm outer diameter) were studied by conventional and microwave heating at 2.45 GHz. Temperature during microwave heating was measured with an infrared pyrometer and was calibrated to ±10°C. With no hold at sintering temperature, microwave-sintered samples reached 95{\%} density at 1350°C versus 1600°C for conventionally heated samples. The activation energy for microwave sintering was 85 ± 10 kJ/mol, whereas the activation energy for conventionally sintered samples was 520 ± 14 kJ/mol. Despite the difference in temperature, grains grew from ∼1.0 μm at 86{\%} density to ∼2.6 μm at 98{\%} density for both conventional sintered and microwave-sintered samples. The grain size/density trajectory was independent of the heating source. It is concluded that the enhanced densification with microwave heating is not a consequence of fast-firing and therefore is not a result in the change in the relative rates of surface and grain boundary diffusion in the presence of microwave energy.",
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Microwave sintering of alumina at 2.45 GHz. / Brosnan, Kristen H.; Messing, Gary Lynn; Agrawal, Dinesh Kumar.

In: Journal of the American Ceramic Society, Vol. 86, No. 8, 01.01.2003, p. 1307-1312.

Research output: Contribution to journalArticle

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