Apparent Activation Energy in High Frequency Microwave Sintering of Alumina Ceramic

Abstract:

The observed enhancements in the high frequency microwave processing alumina compared to those in conventional method at the same sintering temperatures have been studied. Some possible mechanisms responsible for the enhancements were investigated and are discussed in this paper. The enhancements could be associated with the increase either in driving force or in apparent activation energy of diffusion. An experiment to estimate the driving force of sintering is not easy to perform because the force depends not only on the density and grain size but also on the electric field in the materials. Therefore, a series of experiments to estimate the apparent activation energy were performed in high frequencies microwave and in conventional sintering method, as well. It was observed that the apparent activation energy in conventional sintering was much lower than that of microwave sintering. These activation energy values suggested that diffusion rate in microwaves sintering was faster, which led to the higher densification.

• Periodical: Advanced Materials Research (Volume 1123)
• Pages: 391-396
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1123.391
• Online since: August 2015
• Authors: Inyoman Nyoman Sudiana*, Seitaro Mitsudo, Shunsuke Inagaki, La Ode Ngkoimani, Usman Rianse, Haji Aripin
• Keywords: Alumina, Apparent Activation Energy, High Frequency Microwaves, Sintering

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