Ferrite magnets
Ferrite magnets, also known as ceramic magnets, are made from a combination of iron oxide and strontium carbonate. Popular for their low cost, ferrite magnets are relatively weak compared to rare earth magnets but offer excellent resistance to demagnetization and corrosion. They function well in a wide range of temperatures, making them suitable for a variety of industrial and consumer applications.
Typically hard and brittle, ferrite magnets are usually shaped through a sintering process that involves pressing and firing powdered materials at high temperatures. They are commonly found in motors, loudspeakers, and magnetic assemblies where high magnetic strength is not the primary requirement.
Their main advantages include their cost-effectiveness and their ability to maintain magnetic properties under harsh conditions, such as exposure to weather or chemicals. This makes them ideal for outdoor use in applications like magnetic separators, automotive sensors, and various household appliances. Despite the availability of stronger magnets, ferrite magnets remain extensively used due to their durability and functional adequacy in many everyday applications.