Sintering: Utilize Vacuum Sintered Furnace to make the Pressing Semi Products to be more tight and Close-Knit .and to avoid the magnets too loose .After Sintering,the density of magnets blocks and cylinder and arc will be much better to machine during the future Procedure.. Sintering Magnetic Properties are developed by an aging heat treatment which may be in the presence of a magnetic field.Following picture is some of Sintered NdFeB Semi-Products ,which just took out from Sintering Furnace.