Production Sintering Practices Cooling

After holding at sintering temperature, loads containing small parts can be cooled to room temperature in —2 to 4 h by circulating inert gas (argon or helium) through the load at or near atmospheric pressure. Cooling of large parts is prolonged to minimize thermal stresses. When all significant material and process parameters, such as powder preparation, chemical composition, heating rate, holding times and temperatures, and cooling procedures, are properly adjusted, the as-sintered surfaces of all pieces in the load achieve the same composition and structure as the interiors of the pieces. This eliminates scrap or rework associated with compositional imbalances and reactions with the furnace atmosphere.

0 0

Post a comment