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Alnico magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.

Applications of Alnico Magnets:

•Separators
•Sensors
•Electron tubes
•Traveling wave tubes
•Radar
•Holding magnets
•Clutches and bearings
•Motors
•Relays
•Controls
•Generators
•Receivers
•Telephones
•Microphones
•Bell ringers
•Loudspeakers
•Cow magnets
•Educational products

Attributes of Alnico:
 
•Very temperature stable, great for high heat applications
•Working temperature can reach 550-600 °C
•Does not lend itself to conventional machining (hard and brittle)
•High residual induction and energy product compared to ceramic material
•Low coercive force compared to ceramic and rare earth materials (more subject to demagnetization)

details:http://www.china-magnet.net/alnico.html