Microwave technique: An innovated method for sintering beta-eucryptite ceramic materials

Abstract

Microwave sintering has emerged in recent years as a new, fast, cheap and green technology for sintering a variety of materials. The main advantages of microwave heating can be summarized as follow: reduced processing times, energy costs and environmental benefits. Nevertheless, understanding how this specific heating drives to obtain ceramic materials with a combination of unique, structural and functional properties is the big challenge. The present work shows the different and improved properties achieved with beta-eucryptite nanocomposite ceramic materials by microwave heating in respect of the conventional method. Microcracking evolution in addition to the microstructure of the sintered materials along the several thermal cycles have been studied. Mechanical properties related to this behaviour change dramatically. Thus, the microwave technique is a promising tool for sintering new materials by controlling the composition of the phases, chemical reactivity and nanostructure, using up to 70% less energy in the whole sintering process than conventional heating. This technique becomes part of the new and innovative technologies "eco-green".