Metal powders can be used as raw materials, but because they are not cohesive, they are in an uneven state. Therefore, in the processing should be added to the adhesive as a necessary component or product, so that the molding can be accelerated to a certain extent, if the direct method of operation, the use of powder materials will be different.

1. Single-component metal powder sintering of the unit system, especially the metal with high melting point, can reach the melting temperature in a short time, which requires a large power laser. During sintering, the laser irradiation on any metal powder particle lasts for a very short time, usually between (0.5 ~ 25) ms. The melting and solidification of the powder particle is completed in an instant.

2, multicomponent metal powder mixed system of multicomponent metal powder system commonly used traditional liquid phase sintering mechanism, forming mechanism of the liquid phase sintering can significantly improve the rate of diffusion of the atom, cause the migration of substances, accelerate the sintering process, and the liquid will fill the porosity of the sintered body between the solid particles, can obtain higher density of sintered parts.

3. Prealloy powder. The bonding of the single-component prealloyed powders is also accomplished by liquid phase sintering. The sintering temperature is selected between the liquid phase temperature and the solid phase temperature of the components, which is called supersolid phase line-liquid phase sintering. Sintering process of prealloyed powders: liquid phase formation, particle crushing, rearrangement, grain refilling and sliding, coarsening, dissolution and reprecipitation to eliminate pores.

Application field of metal powder injection molding technology has already begun diversification, in which all walks of life are at an alarming rate into forward, from the vessels with parts, machinery parts, auto electrical parts, medical machinery parts, computer auxiliary facilities, the tools, home appliances, military parts, etc., are inseparable from the technology.