Alnico magnets since their discovery in the early 1940s, have been the choice for many applications. They are known as the workhorse of the permanent magnet industry. Their low cost and wide application makes them the choice material of many industries.
Attributes Of Alnico Magnets:
- Alnico magnets are very temperature stable. This makes them a great choice for applications that require high heat.
- The maximum working temperature of an alnico magnet can be as high as 97500 – 10200 F or 4500 - 5500 C.
- Alnico magnets can be ground to the required size.
- Alnico magnets are hard and brittle. They do not lend themselves well to conventional machining techniques.
- Alnico magnets exhibit small changes in magnetic properties to temperature effects. They have excellent temperature stability.
- Alnico magnets exhibit good resistance to demagnetization from shock and vibrations.
- They have a strong corrosion resistant nature and no coating is needed for surface protection.
- As compared to ceramic materials, alnico magnets are high residual induction and energy products.
- They also have a lower coercive force as compared to ceramic and rare earth materials.
- They are more sensitive to demagnetization.
- The most commonly used grades of cast alnico are 5 and 8.
Attributes of Cast Alnico Magnets:
- The size parameters of cast alnico magnets range from 1 ounce to about 70 pounds.
- They can be made into a variety of sizes and shapes and hence have a high application in various industries.
Attributes of Sintered Alnico Magnets:
- The size parameters of sintered alnico magnets range from about 1 ounce of material up to 1 cubic inch.
- Alnico magnets are pressed to a very close tolerance and require minimal grinding if any to create the finished product.
- They are the mechanically strongest of all alnicos.