microwave sintering:ceramic-technology

  Principle of microwave sintering of ceramic materials with the current conventional sintering process is essentially different. Conventional heating using resistance heating, by radiation, conduction or convection heat transfer to the sample heat generation, the heat flow direction is from the surface of the sample point to the core section (see Fig. 1 (a)), the formation of the sample surface temperature is high, the heart Ministry of lower temperature field.



 The microwave sintering is the use of a microwave with a special band and fine structure of the basic material of the disaster co-generate heat, the material dielectric loss in the electromagnetic field of the material as a whole is heated to the sintering temperature to achieve densification methods. Since the inner and outer materials may be completely different overall uniformly absorb microwave energy and is heated, so that thermal gradients and heat flow in the direction of conventional sintering in the microwave field inside the sintered material when FIG 1 (b) in Fig.


  Microwaves can achieve rapid uniform heating of the sample without causing cracking or thermal stress formed in the sample, more important is the rapid sintering, allowing the internal material to form a uniform fine grain structure and high density, thereby improving the material properties. Meanwhile, since the internal components of different materials having different degrees of microwave absorption, and therefore can achieve selective sintering, thereby preparing a material having the novel microstructure and excellent performance.




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