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What is Microwave Sintering?

Features

Advantage

Materials

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 Microwave Sintering accelerates densification by irradiating Microwave to powders. The principle of Microwave Sintering is as follows:
Dielectric coefficient of a ceramics dielectric can be described as
ε =  ε’ +  ε” , where ε’ represents real quantity and ε” represents imaginary quantity, respectively. If electric field E(with frequency f) is applied, owing to dielectric loss, a dielectric releases heat P per second.

P = 2πfε‘‘tanδ (tanδ = ε‘’/ε)

As you can see, an object can be effectively heated if dielectric coefficient ε‘‘ of an object and frequency f of microwave is high. However, penetration depth of microwave is Dp = (πfμσ)-1/2, so that frequency of microwave should be conrolled appropriately to prevent surface heating. Usually, microwave with frequency 2.45 GHZ is applied.

There are a couple of advantage of Microwave Sintering; first, driving force for sintering is strong because growth of grain is prohibited by rapid heating, secondly, sintering is promoted because particle surface is activated by plasma, thirdly, different from other indirect heating methods, this method expedites lattice vibration. For this reason, diffusion velocity is fast. From these advantages, we can acquire ceramics having high densification and fine microstructure in a short time. Accordingly, Microwave Sintering is fitting to Ceramics Nano Materials which are in the spotlight nowadays.

 

 

 

 

 

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