Dry granules of Alnico material are compacted under high pressure in metal dies and is used for lower grade Alnico’s. Sintered Alnico magnets has a different chemical composition as compared to cast Alnico’s. Some of the various grades are:

Sintered Alnico 2 10 Al, 19 Ni, 13 Co, 3 Cu, Bal. Fe.
Sintered Alnico 5 8 Al, 14 Ni, 24 Co, 3 Cu, Bal. Fe.
Sintered Alnico 6 8 Al, 16 Ni, 24 Co, 3 Cu, 1 Ti, Bal. Fe.
Sintered Alnico 8 7 Al, 15 Ni, 35 Co, 4 Cu, 5 Ti, Bal. Fe.
Sintered Alnico 8 HC 7 Al, 14 Ni, 38 Co, 3 Cu, 8 Ti, Bal. Fe.
The sintered Alnico magnets start as a 200 mesh powder and pressed to 30-35 tons per square inch at 1350°C (± 5°) and then heated to 935°C (± 5°) and cooled in a magnetic field of proper shape and intensity. They are then heated to 627°C (± 5°) for one hour and then 550°C (± 5°) for four hours. This process is for oriented grades only and ground to desired dimensions.