Amazing Rare
Monday, August 29th, 2011
Frequently Asked Questions About Rare Earth Magnets
Rare earth magnets are amazingly strong despite their small size. Compared with a refrigerator magnet, it can be 5-15 times the magnetic energy. It is often used in electronic equipment and industrial fields. The most common types are samarium cobalt and neodymium iron boron.
The strongest magnet
Neodymium-iron-boron is currently the strongest of all rare earths. However, this metal is very sensitive to temperature changes and will lose some of its magnetization when exposed to high heat. If the temperature exceeds 150 degrees Celsius, samarium cobalt becomes stronger.
Factors affecting the strength
The magnetization of a metal is greatly affected by its environment. All magnets are affected by heat, although some have a greater impact than others. Radiation also plays an important role in the magnetic force of a metal. When there is a strong electric current near a magnet, its strength may cause either decrease or increase depending on the type of metal.
Have another magnet close may adversely affect its properties traction. Neodymium iron boron and other metals corrode easily Neo if the environment is wet, manufacturers often add plastic or coating rubber. Vibration and shock generally has no effect on the magnets, but if the force is large enough, it can physically damage the metal.
Tensile strength
Magnetic force will gradually weaken as the distance increases. If you have an object millimeter metal from a magnet, the force will be much greater than if you keep it several feet. All rare earth magnets have their own forces in distance ratio.
Demagnetization
The materials can be re-magnetized and demagnetized at will. If the metal has not been damaged by excessive heat, it's easy enough to bring it back to its original strength. If a company wants to store a large magnet, they can then re-magnetize degauss when they use it again.
Resistance measurement
The strength of a magnet is measured by pull testers, magnetometers, and Gaussmeters. The two magnetometers and Gaussmeters using arbitrary units or Gauss for the measurement. Pull testers kg of use, books, and other units that are easy to understand. A special Gaussmeter can cost several thousands of dollars, while the basic version will cost from $ 400 – $ 1500.
North and South
In industry standard definition, the North Pole of a magnet is the side that seeks the North Pole of the Earth when it is free to rotate. Similarly, the side of the pole south of the land is claimed by one side South Pole magnet. Many former navigation devices have used magnets to tell the direction.
Dangers
Rare earth magnets are very strong, so they must be handled with care. Do not let the big magnets pressure against the steel or will crack. Keep them away from computer monitors, credit cards, hard drives and other data transfer of electronic equipment.
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