Paper Title:
Microwave Processing of Ceramics
  Abstract

Microwave (MW) processing is advantageous for processing ceramics with tailored microstructures. Its combination of volumetric heating, a wide range of controlled heating rates, atmosphere control and the ability to reach very high temperatures allows processing of 'difficult' materials like high thermal conductivity AlN and AlN composites and microstructure control in more readily sintered ceramics such as ZnO. MW sintering promotes development of thermal conductivity in AlN (225 W/mK) and its composites (up to 150W/mK inAlN-TiB2 and up to 129 W/mK in AlN-SiC when solid solution is avoided). In ZnO, heating rate controls sintered grain size. Increasing the heating rate from 5°C/min. to 4900°C decreases grain size from ~10 μm (comparable to conventional sintering of the same powder) to nearly the starting particle size (~ 1μm). Microstructural uniformity increases with sintering rate since ultra-rapid MW sintering minimizes the development of thermal gradients due to heat loss.

  Info
Periodical
Edited by
P. VINCENZINI
Pages
857-862
DOI
10.4028/www.scientific.net/AST.45.857
Citation
I. K. Lloyd, Y. Carmel, O. C. Wilson Jr., G. F. Xu, "Microwave Processing of Ceramics", Advances in Science and Technology, Vol. 45, pp. 857-862, 2006
Online since
October 2006
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$32.00
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