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owner of the online magnet store, www.Custom-Magnets.com. Custom-Magnets has been supplying
magnetic material and custom fridge magnets since 1999.
Neodymium magnets are the strongest permanent rare earth magnets. They have a high resistance to demagnetization and many applications. Here are some commonly asked questions about Neodymium magnets.
What are grades in Neodymium magnets?
When you see Neodymium magnets classified as N35, N39, N41 have you ever wondered what it means? The number after N represents the grade of the magnet. In general, the higher the grade the stronger the magnet. The highest grade so far in Neodymium magnets is N50.
If a magnet is labeled as N42UH, then 42 depicts the strength of the magnet and UH refers to the temperature rating of the magnet. If the numbers are not followed by any letters it means that the magnet is standard temperature Neodymium.
Why are Neodymium magnets coated?
Neodymium magnets are mainly a composition of Neodymium, Iron and Boron and hence are also referred to as NIB magnets. When these magnets are exposed to air, the Iron in Neodymium magnets can rust and ruin the magnet. Thus, to prevent the magnet from corrosion and to strengthen the brittle magnet material, Neodymium magnets are coated with nickel. Zinc, tin, epoxy, gold and silver are also used for coating Neodymium magnets.
The type of coating does not affect the performance of the Neodymium magnet. The type of coating is selected based on the company’s preference or application. Nickel has a shiny silver finish and has good corrosion resistance. Black nickel has a shiny charcoal finish and is slightly more resistant to corrosion than regular nickel. Zinc has a bluish finish and can often leave an unappealing black residue on hands. Epoxy is a popular plastic coating that is 100% corrosion resistant. It is very popular when using magnets for manufacturing toys. Unfortunately, it lasts only so long as the coating is intact and doesn’t chip and is in fact the least durable of all the coatings. Gold plating is generally applied over nickel-plating so it has all the characteristics of nickel plating but with a gold finish.
Can Neodymium magnets be machined?
Neodymium magnets are prone to chipping and cracking and hence do not lend themselves well to machining. However, Neodymium can be coarsely ground using generous amounts of coolant. The coolant helps keep the temperature low and reduces the chance of heat fracturing and the risk of fire.
Generally because of the various attributes of Neodymium magnets it is not advisable to machine handle them.
How are Neodymium magnets made?
Neodymium magnets also known as NIB magnets are made from a composition of Neodymium, Iron and Boron. The powdered mixture is pressed into molds under great pressure. The material then undergoes the sintering process during which it is heated in vacuum. It is then cooled and then ground or sliced into the desired shape. Coatings are applied as desired. The blank magnets are then magnetized by exposing them to very powerful magnetic fields.
Do Neodymium magnets pose a safety hazard?
If not handled properly and with extreme care, Neodymium magnets can pose a safety hazard. Read more about safety guidelines for Neodymium magnets.
What are Neodymium magnets used for?
There are many uses of Neodymium magnets in education, industry, medicine and health and even around the house.
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