Alnico magnets derived their name from their main ingredients namely Aluminum, Nickel and Cobalt. Among all the available magnetic materials they have the most temperature stability. Alnico magnets perform extremely well for applications that are exposed to temperatures above 400 degrees Fahrenheit.

Alnico magnets come in grades 2, 5 and 8, both sintered and cast. Sintered alnico magnets have slightly lower magnetic properties, however they have excellent mechanical properties. Alnico magnets are excellent choices for applications involving vibration and shock as they have good resistance to demagnetization.

Alnico magnets come in a variety of shapes and sizes. Some of the common shapes are horseshoe, button, shallow pot, ring, rectangular and bar magnets. The shallow pot and button magnets come with keeper plates and can be supplied with either a red or blue painted finish. Cast Alnico 5 is the most commonly used in the industry due to its high energy product of 5 MGOe and high inductive nature.

To obtain optimum performance of Alnico 5 the magnetic length should be approximately 5 times the diameter for rods, or for rectangular magnets length should be 5 times diameter of an equivalent circle.

Alnico magnets are extremely difficult to machine as they are very hard and brittle. They should be case or sintered as close as possible to the required dimensions in order to minimize grinding to finished dimensions.

Alnico magnets are derived from Aluminum, Nickel and Cobalt used in their manufacture. They perform well in applications exceeding exposure of
400 Degrees Fahrenheit.

 

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