Traditional magnets: features and application
Permanent magnets are used in many appliances, tools and devices. Form part of the electric meters, acoustic systems, motors, inductors, separators and rollers printed. They are also used in the production of magnetic sealing profiles and as part of the installation or imprisonment (latch magnetic jewelry you want to pin to a magnet, locks in cabinets, etc.).
Material of the magnet
Chemical composition and a method of manufacturing a magnet have a huge impact on its subsequent properties. Ferrite magnets (ceramic) have medium capacity and are relatively fragile but have a high resistance to harmful chemicals (salts, acids, lubricants) and corrosion under the action of water. Can also be used at very high temperatures (300°C) without risk of demagnetising. Neodymium magnets produce a very strong magnetic field compared to its weight - they are not able to support the weight of thousands of times more than their own. Using this properties are widely used in electronics and as an Assembly element. It is worth remembering that neodymium magnets have a relatively low resistance to high temperature: some rozmagnesowują already 80°C. available On the market also other types of magnets, among other things, Alnico (an alloy of iron with additions of aluminum, Nickel and cobalt) with high mechanical strength and relatively high power. Industry used also magnets made of rare earth elements (e.g., magnets Samarovo-kobaltowe, and relationships dysprozu or laser) - expensive, but have a high capacity and resistance to high temperatures.
The shape and size of the magnet and its characteristics
The shape of the magnet affects its polarization. For example, in sztabkowym magnet poles are on opposite ends of the bars, the magnet podkowiastym - at the ends of a horseshoe, while the round magnet plate at the top and bottom of the tile. In the case of neodymium magnets form also affects the degree of stability of the temperature, because it decreases with increasing disparity between the height and the diameter of the magnet (the closer to each other are these values, the higher the resistance to demagnetization under high temperature). The size and weight of a magnet affect its strength, i.e. the density of magnetic energy: the big magnet is stronger than the small (in the case of magnets, made of the same materials).