Samarium magnet cylinder dia. 6x3 mm, resistance 250 St.C - SAFETY!!!

Additional description

MAGNET COLLECTION: Do not swallow or inhale magnets. Attraction to magnets located in the body can cause serious injury and requires immediate medical attention. Keep out of reach of children. Magnets are not a toy.

DANGER OF INJURY: Magnets are very fragile. Colliding magnets can burst and sharp splinters can be thrown several metres away and injure the eyes. Handle the magnets carefully and attentively to avoid magnet collision.

ATTENTION: the magnets are very strong and can come together over a long distance. Keep the magnets well apart and wear safety glasses when handling them. Also think about the safety of the people who are watching the magnets being handled.

DANGER OF INJURY: Large, especially neodymium magnets have a very strong attractive force. Careless and distracted handling can cause fingers or skin to get stuck between the magnets. WARNING: this can cause bruising and contusions. Very large, especially neodymium magnets can cause bone fractures. Wear thicker protective gloves when handling larger magnets.

Samarium magnets (SmCo)

The chemical base of these magnets consists of the elements samarium and cobalt in the ratio SmCo5 or Sm2Co17. They are produced by sintering of very finely ground substances, as their direct casting is not possible - see Production Technology . These magnets have a high internal energy and therefore also a high adhesive force in small dimensions, unlike conventional ferrite magnets.

Properties

SmCo magnets are hard and relatively brittle, which must be kept in mind especially when handling magnetized products in the vicinity of other magnets or ferromagnetic materials (iron, etc.). Magnets are produced in finished shapes that can be slightly modified by grinding. However, care must be taken to ensure that the grinding surfaces do not heat up (see table below - max. use temperature).

SmCo magnets have slightly lower internal energy, see maximum product (BH)max, than neodymium magnets (FeNdB), but they have significantly higher temperature resistance (up to 300oC - see table below). In addition, they are practically not subject to corrosion, so they do not need to be coated with a protective surface layer.

In the past, the price of SmCo magnets was considerably higher than FeNdB magnets, nowadays the differences are much smaller.

Usage:
Permanent SmCo magnets are used in similar applications as FeNdB magnets, i.e. in high power electric motors, generators, dynamos, magnetic clutches and brakes and wherever high performance and resistance to higher temperatures are required.

Ferrite magnets are very resistant to corrosive influences and high temperatures, which makes them widely used. They are inexpensive and are commonly used, for example, in loudspeakers, motors or transformers. Ferrite magnets have a relatively weak magnetic field compared to neodymium or samarium magnets.

Neodymium magnets are the strongest permanent magnets available. They are made of neodymium, iron and boron (NdFeB) and have an extremely strong magnetic field. However, they are not as resistant to corrosive effects and temperatures as ferrite magnets. In practice, they are often covered with a protective layer. They are used in applications where a very strong magnetic field is required, such as computer hard drives or electric motors.

Samarium magnets, made up of an alloy of samarium and cobalt (SmCo), are also very strong magnets. They are not as strong as neodymium but are more resistant to temperature and corrosive effects. These magnets are relatively expensive and are used in applications where resistance to high temperatures is required, such as in the aerospace industry or in applications with high temperature stability requirements.