Temporary magnets can vary in composition, as they are essentially any material that behaves like a permanent magnet when in the presence of a magnetic field. However, because these magnets tend to be brittle, they require grinding using a diamond wheel. They are one of the most commonly used types of magnet, and are strong and is not easy to demagnetize. Ceramic or FerriteĬomprised of sintered iron oxide and barium or strontium carbonate, ceramic or ferrite permanent magnets are typically inexpensive and easily produced, either through sintering or pressing. Casting results in higher energy products and enables the magnets to achieve more complicated design features. Sintering produces enhanced mechanical traits. They can be produced by either sintering or casting, with each process yielding different magnet characteristics. Although they feature good temperature resistance, they can easily be demagnetized and are sometimes replaced by ceramic and rare earth magnets in certain applications. AlnicoĪlnico magnets get their name from the first two letters of each of three main ingredients: aluminum, nickel, and cobalt. However, they can be expensive and have low-mechanical strength.
On off magnet series#
The second series (Sm2Co17) has a range that falls between 22 and 30 MGOe. The first series (Sm1Co5) has an energy product range of 15-22 MGOe. Two different groups of SmCo magnets exist, divided based on their product energy range. They are also highly oxidation-resistant and temperature resistant, withstanding temperatures up to 300 degrees Celsius. Like NdFeB magnets, SmCo magnets are also very strong and difficult to demagnetize. They are very strong magnets and are difficult to demagnetize. If treated with gold, iron, or nickel plating, they can be used in many applications. However, NdFeB magnets have low mechanical strength, tend to be brittle, and low corrosion-resistance if left uncoated. Because of this high product energy level, they can usually be manufactured to be small and compact in size. They have an extremely high energy product range, up to 50 MGOe. This type of magnet is composed of rare earth magnetic material, and has a high coercive force. There are typically four categories of permanent magnets: neodymium iron boron (NdFeB), samarium cobalt (SmCo), alnico, and ceramic or ferrite magnets. Below we breakdown the various types of magnet available. By adjusting the strength and direction of the current, the strength of the magnet is also altered. Electromagnets are wound coils of wire that function as magnets when an electrical current is passed through. Temporary magnets are materials magnets that perform like permanent magnets when in the presence of a magnetic field, but lose magnetism when not in a magnetic field. Permanent magnets are magnets that retain their magnetism once magnetized. Of course, not all magnets are composed of the same elements, and thus can be broken down into categories based on their composition and source of magnetism. Magnets are objects that generate a magnetic field, a force-field that either pulls or repels certain materials, such as nickel and iron, but what are magnets made of and what are the different types of magnets? We give you everything you need to know about the types of magnets and their strengths and uses.
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