The powder metallurgy process is a material processing technology in which powder is pressurized and solidified into a shape with good dimensional accuracy. This method uses the fluidity of the powder to form the final shape, eliminating the cutting process. In addition, since it does not require melting, it is possible to produce materials that are difficult to synthesize by the melting method. Furthermore, we also specialize in the fabrication of composite materials and porous materials.
Sintering is the process of heating the solidified powder to a temperature below its melting point to form a compact by bonding the particles together. The compact becomes a dense sintered body as atoms move through the contact points of the powder due to the driving force to reduce the energy of various defects and work strain strains in the powder.
Sintering methods are broadly divided into non-pressure sintering methods and pressure sintering methods. The pressure sintering method is a method in which the powder is heated under pressure. Sintering is performed by heating and applying uniaxial or hydrostatic pressure to the powder or compact filled in a graphite or metal mold. Typical sintering methods using uniaxial pressure include the SPS method and the hot press method.
The SPS method is generally called the Spark Plasma Sintering (SPS) method, the Pulse Current Sintering (PCS) method, etc. We call it the energizing heat processing method. In the SPS method, a mold is filled with powder, a pulsed high current is applied together with uniaxial pressure, and sintering is carried out by self-heating of the sintered material and the mold. Compared with other sintering methods, high quality sintered bodies can be produced in a shorter time. In addition, dissimilar materials and synthetic materials can be joined.
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