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Combined Processes: Laser Assisted Microwave Sintering of Alumina
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Abstract
The engineering applications of technical ceramics are generally related to microstructure-controlled properties. The main objective of processing is to produce the desired microstructure, which frequently involves obtaining high density and small grain size. In the present study hybrid heating technique, which combine direct microwave heating with laser heat sources was proposed to sinter alumina which is a poor absorber of microwaves at room temperature. With increasing temperature by absorbing laser radiation, alumina can absorb microwave energy. The aim of this work is to explore numerically the hybridization of laser and microwaves energies to achieve rapid sintering with controlled grains size, density and free cracks sample by minimizing the temperature gradient between the core and sample surface. The simulation use finites volumes method in FORTRAN program.
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