Microwave Heating and Sintering Technology of Ammonium Paratungstate

Ammonium paratungstate microwave heating sintering technology, refers to ammonium paratungstate in the microwave field to absorb high-frequency microwave energy, then the molecules or atoms produce violent shocks, friction, rotation and collision, the molecular high-speed kinetic energy into heat. Thus achieving ammonium paratungstate heating.

When ammonium paratungstate absorbs enough microwave energy in the microwave field, it can be raised to a certain temperature to reach the synthesis temperature of the corresponding substance. Thus completing the sintering process of ammonium paratungstate. Ammonium paratungstate microwave sintering technology is the use of materials to absorb microwave energy, without heat conduction and the completion of "self-heating." Therefore, microwave heating and sintering can make the whole material quickly and uniformly without temperature gradient phenomenon, so as to achieve the densification sintering. This method can avoid the traditional sintering of ammonium paratungstate pores, cracks and other sintering defects appear.

Ammonium paratungstate microwave sintering technology compared to the traditional high-temperature sintering furnace, has the following characteristics:
(1) The overall uniform heating, no temperature gradient, can improve the material properties.
(2) After the material absorption is not necessarily rapid heating, the maximum heating rate up to 100 ℃ / min, high heating efficiency.
(3) high energy efficiency, green pollution-free.
(4) According to the material medium factor selective heating.
(5) Due to the microwave heating without heat conduction process, the temperature can be appropriate without overheating sintering, can inhibit particle growth.

With the continuous improvement and progress of the microwave heating and sintering technology of ammonium paratungstate, it has been widely used in the preparation of ceramic powder, cemented carbide and cermets. For example, more and more researchers try to use microwave sintering to prepare high-performance cemented carbide due to the better adaptation of the cemented carbide to the microwave field. WC Sintered Specimens WC grains are finer and the Co phase is more evenly distributed than the conventional sintered samples. At the same time ammonium paratungstate samples also have more excellent hardness, resistance to physical and chemical corrosion.

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