FLORIDA UNIV GAINESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
Microwave hybrid heating MHH is a novel combination of microwave MW-material interaction and conventional radiantconduction mechanisms that facilitates the attainment of very high heating rates In a 2.45 GHz. multimode MW cavity. Dry-pressed green samples of pure, undoped alumina were fired under similar conditions by MHH and conventional fast firing CFF. The effect of processing variables temperature, time and heating rates on MHH and CFF were Investigated. The effect of particle size on the MHH phenomena was also studied. MHH has been shown to result in accelerated densification higher densification to coarsening ratios relative to CFF under the same conditions of temperature and time. Higher heating rates with MHH result in higher densities and smaller grain sizes. Smaller starting particle sizes with MHH also culminate In the highest densities and the largest grain sizes similar to conventional firing.
This article is from 'Ceramic Transactions. Volume 21. Proceedings of the Symposium on Microwave Theory and Application in Materials Processing Annual Meeting of the American Ceramic Society (23rd) Held in Cincinnati, Ohio on April 29 - May 3, 1991,' AD-A253 631, p-329-339.