As the name suggests, it refers to the microwave selective heating of some material can be heated while heating the material can not be certain.Therefore divided into four categories according to the material properties are described: the first is a reflective material, typically a conductive material such as metal iron, graphite products and other pressure, which has a microwave reflection.
Microwave heating can not be material, microwave surface parts is reflected through this kind of materials and rarely be absorbed, so you can’t or difficult to be microwave heating The third class of materials for the absorbing materials, such materials have good microwave absorption capacity, high dielectric loss material by itself, and therefore can microwave electromagnetic energy into heat.The fourth class materials for heterogeneous materials, is one of the hot research topic in recent years.
In the field of microwave metallurgy and material synthesis, microwave heating of the object are two phase or multiphase heterogeneous materials, its mechanism is very complex. Characteristics of this kind of material is the local field enhancement effect under microwave irradiation, can cause discharge, produce ultraviolet photocatalytic, this is a new kind of microwave assisted catalytic mechanism.
It worth mentioning is that, when the first class of conductive materials such as iron, copper block, graphite block is processed into a powder, which has a very good microwave absorption capacity, and in a relatively short period of rapid heating to hundreds Celsius or 1000 ℃. Therefore, whether the material can be microwave heating characteristics and the material itself, but also with the physical state of the material.
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