The working principle of the microwave sintering technology

Microwave sintering is the use of the special band of microwave with the basic structure coupling and material and generate heat, material in the electromagnetic field in the dielectric loss of the whole heated to its material sintering temperature and the realizing methods of densification. Microwave sintering principle and fundamentally different from the conventional sintering process. Material can be evenly inside and outside the whole absorb microwave energy and heating, made in microwave field was sinter internal thermal gradient and heat flow direction is totally different from the conventional sintering. Microwave can achieve rapid heating uniformity and does not cause specimen cracking or thermal stress in the sample form, more important is rapid sintering can make the material inside the formation of a uniform fine crystal structure and higher density, improve material performance. At the same time, different materials due to the internal components of the microwave absorption degree is different, so it can realize the selective sintering, was prepared by microstructure and excellent properties of new materials.

Microwave generator in a microwave sintering furnace to replace the traditional heat source, it is compared with the conventional technique, it belongs to two different heating methods. Microwave dielectric heating, chemical raw materials, once placed in a microwave electric field in which the polar molecules and non-polar molecules caused polarization becomes even molecules. In accordance with the direction of orientation of the electric field, as the field belongs to the alternating electric field, the dipoles will change with the electric field caused by the rotation and vibration, such as frequency of 2.45GHz, with 2.4 billion 50 million times per second, rotation and vibration, resulting in similar to the effect of friction between the molecules, so as to absorb the energy of the electric field to generate heat, the heat generation becomes the object itself. When heated in a conventional manner, ignition ignited always starting from the sample surface, burning spread from the surface to the inside of the sample finalized sintering reaction. While the use of microwave radiation, the situation is different. Because microwave has a strong ability to penetrate deep into the interior of the sample, first the center of the sample temperature rises rapidly to reach the ignition point and trigger combustion synthesis. Sintering waves propagate radially outward from the inside, which makes almost the entire sample is uniformly heated, finalized sintering reaction. Microwave ignition ignite resulting in a sample temperature gradient (dT, dt) is much smaller than conventional ignition. That spread microwave sintering process of sintering wave much more uniform than conventional heating methods.


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