Dr. Dmitri Kopeliovich
Sintering is a method involving consolidation of powder grains by heating the “green” compact part to a high temperature below the melting point, when the material of the separate particles diffuse to the neighboring powder particles.
Decrease of the porosity, caused by the sintering process, is determined by the level of the initial porosity of the “green” compact, sintering temperature and time.
Sintering is enhanced if a liquid phase takes part in the process. This occurs when the powder contains a component, having the melting point lower, than the melting point of the base metal (for example in copper-lead-tin bearing alloys).
Continuous belt furnaces are commonly used for the sintering process.
In this machine a mesh belt conveyor moves the parts through a long tube like furnace.
Typical sintering furnace has three zones:
All commercially used metals may be sintered.