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In recent years, powder sintering technique after another. Field activated sintering (FAST) is generated by applying a low voltage (~ 30V) and high current (> 600A) of the electric field during the sintering process, and the DC pulse discharge to achieve the same time, to achieve the electric field activated sintering, to obtain a significant refinement of microstructure , significantly lower the sintering temperature, sintering time is shortened purposes. Selective Laser Sintering (SLS) applications layered manufacturing method, first performed on three-dimensional computer model to meet the needs of CAD and then layered software model stratification, get each cross-section, and then automatic control technology, the laser selectively sintering the computer corresponding to the inner cross section of the part of the powder fraction, tiered sintering. 

 

In theory, these sintering technology has high academic value, but most still in the laboratory stage, can only be used for small quantities of small size sintering molybdenum products, there is a great distance from the applied research industry. Molybdenum sintering technology has some prospect of major industrial application of microwave sintering technology, hot isostatic pressing, spark plasma sintering technology, aluminum thermal reduction - Sintering - body technology, following a general introduction spark plasma sintering technology. 

 

Spark Plasma Sintering Technology (SPS) is a use - OFF DC pulse current direct current sintering pressure sintering method. Its principle is that the process, the electrodes through the through - DC discharge plasma-off pulse current is instantaneously generated when the discharge pressure of the impact, and the Joule heat diffusion field, so that the particles inside the sintered body of each of its Joule heat is generated uniformly and to the particle surface activation, thus using its own internal implementation heating effect powder densification, obtain homogeneous, dense, fine-grained sintered organization. Such sputtering, and impact of the discharge lower than the conventional sintering process 180 ~ 500 ℃, and the high-temperature plasma can remove impurities on the surface of the powder particles (e.g., removal of surface oxides, etc.) and gaseous adsorption. German companies have adopted this technology FCT prepared molybdenum target diameter of 300mm, while China reported no similar production processes. 

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