1, metal powder sintering
By the experimental study of FeCu, C Fe and other alloys by Guo Zuoxing et al., it is found that the microstructure of the laser sintering is different from that of the conventional sintering. 

The microstructure of the laser is different with the cooling mode, and the air cooling is obtained with the cooling method.
Metal powder compaction is two kinds of metal powder with high or low melting point. It can be used for laser sintering, low melting point metal melting, flow between the particles into the 

high melting point of the particles, so that the high melting point of the powder particles to re arrange, get a high density of samples.
2, metal powder laser sintering
Texas, Austin, SLS,, has been studied in the form of a metal powder, such as NiSn CuSn bronze, bronze nickel powder, and the metal parts are successfully fabricated. In recent years, they

 have been studied in the form of single metal powder laser sintering, which has been successfully used in the metal parts of the NCONEL625 AIM9 and F1 14 alloy. Laser rapid prototyping 

technology USA aerospace company has successfully developed advanced titanium alloy component. At present, metal of the Chinese Academy of Sciences and northwest industry university 

and other units is working in high melting point metal laser rapid prototyping of, Nanjing University of Aeronautics and Astronautics also in this regard were studied with Ni based alloy mixed 

copper powder sintering test, successfully create a larger angle of inverted cone shape metal parts.
Laser direct sintering metal powder manufacturing technology is not very mature, the research is more than two kinds of metal powder mixed sintering, one of the low melting point, and the 

other is higher. Laser sintering of the low melting point of the powder melting, the melting of metal will be high melting point metal powder bond. Due to the low strength of the sintered parts, 

need to go through postprocessing to reach a higher intensity.

Nickel base alloy powder and sintering the mixed metal parts

3, metal powder and binder mixed sintering
This process method is more mature, has been able to produce metal parts, and in practice to use. Nanjing University of Aeronautics and Astronautics metal powder as matrix materials (iron),

 adds the right amount of dry node agent, sintered by prototype, and then the subsequent processing, including the process of burning loss of binder, high temperature roasting, infiltration 

with metals (such as copper infiltration) etc. eventually produce EDM electrode. And the three-dimensional mold cavity is processed on the electric spark machine tool by using this electrode.
Firstly, the metal powder and a binder are mixed evenly in a certain proportion, and the laser beam is used to selectively scan the mixed powder. The effect of the laser can be used to melt 

and bond the metal powder into the metal powder. The metal parts body to carry out the appropriate postprocessing, such as the two sintering to further improve the strength and other

 mechanical properties of the metal parts.