Microwave Processing of Aluminum-Silicon Carbide Cermets

Abstract

Electromagnetic radiation in the microwave range has been utilized for the fabrication of SiC particulates-reinforced aluminum matrix cermets. Powder mixtures with compositions ranging from 70 wt% Al - 30wt% SiC to 100 wt% Al were placed and processed under protective nitrogen atmosphere in a 750 W multimode cavity operating at 2.45 GHz. Temperatures larger than 800°C have been achieved in a time varying with the mixture composition. Microstructures and some physical properties of the composites are presented.

Heating of Metal Particles in a Single-Mode Microwave Applicator

“…6,7) MW heating of metals has been attempted 8,9) and it was applied to chemical reactions. 10) Moreover, for clarification of the MW heating mechanisms of metals, Penn state group has performed experiments using a single mode MW applicator.…”

Simulation of the Microwave Field Influence on Wastes Melting

“…According to Figure 2, the waveguide has a parallelipipedic section. The way of transmitting electromagnetic waves through waveguides of various shapes and dimensions has been extensively studied in the past and specific relations for the calculation of the wave propagation characteristics have been determined [2]. Transmission modes in perpendicular waveguides have been divided into several types, characterized by the value of critical wavelength, λ c .…”

“…In this process, a heating effect of the dielectric material is generated by the electric field of high frequency (hysteresis losses) and partially by the Joule effect [2], [3], [4].…”