Explanation

Contact the powder preform with the liquid metal or immerse it in the liquid metal, so that the gaps in the compact are filled by the metal liquid. After cooling down, dense materials or parts are obtained. This process is called infiltration. The infiltration process depends on the external metal liquid to wet the powder porous body. Under the action of capillary tube force, the liquid metal flows along the interspace between particles or the interspace within particles until the interspace is completely filled. Therefore, in essence, infiltration is a special case of liquid phase sintering. The difference is that densification mainly depends on the fusible components to fill the gap from the outside, rather than the shrinkage of the compact itself, so the infiltration parts basically do not shrink, and sintering takes a short time. It is mainly used to produce electrical contact materials, machine parts, cermet materials and composite materials.

Classification