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The following article was published in our article directory on June 21, 2014.
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Types of Disc Magnets

Article Category: Shopping

Author Name: Nick Bugeja

Disc magnets are round flat magnets which are in the shape of a disc. It resembles a coin. They can be used as a way to hold pictures, art works, and others on doors or walls. They can also be seen on parts lifters, magnetic mounts, latch magnets, and on magnetic tool holders. The magnets seen on refrigerators also make use of disc magnets.

There are three types of disc magnets and they all have their own unique advantage over the others. The ceramic disc magnets are the most common type of disc magnets. It has medium strength and is the most inexpensive of all. These magnets have a thin coat of magnetic powder and are not heavy on maintenance. They are hard but are a bit brittle. Their grade ranges from 5 to 10, with 10 being the strongest. They can be used in fairly high temperatures, but the magnetic properties will drop with the temperature. These magnets are made by calcining a mixture of strontium carbonate and iron oxide to compose a metallic oxide. They are a bit easy to magnetize and needs only a moderate magnetizing field. These magnets are mostly used with a mild steel element.

Another type of disc magnets is the samarium disc magnet. Samarium magnets are more expensive than the ceramic ones because they are stronger and harder, can resist high temperatures, and do not need protection from surface rust. Despite their hardness, however, they are quite fragile, and can break if dropped. Thus, special care is required when handling such magnets. Their strength has a grade from 18 to 33. These magnets are very resistant to demagnetization and can be used in temperatures up to 260 degrees Celsius. These are made through a powdered metallurgical process. Because these discs are very strong, they need a large magnetizing field which requires special equipment.

The third type of discs is the rare earth magnets, which are the strongest amongst the three. They are made out of alloys from rare earth elements and yield a much stronger magnetic field than the other two. Their strength grades from 35 to 55, with the commonly used grades being 35, 40, 42, and 45. Not all rare earth magnets are protected from rust, and those that are not may rust in humid conditions. They also have a poor resistance to corrosion. Much care is needed when making use of these magnets because they have the potential to cause harm because of their strength. Temperature-wise, these magnets are very vulnerable to high temperatures. Like the samarium magnets, these are also through a powdered metallurgical process, making use of rubber or rigid steel molds.

The variety of magnets available means that they can be used for a handful of purposes, from just holding objects, to the more technical applications. The type that would be used would depend on the strength that would be required for the certain job.

Keywords: rare earth magnets, neodymium magnets, disc magnets, n52 magnets

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