Insightful Study on Neodymium Magnets
Neodymium magnets, also known as Neo Magnet is in the set of permanent rare earth magnet which is an alloy of Neodymium, Iron and Boron. The chemical compound Nd2Fe14B forms a tetragonal crystalline structure. This strongest cast of commercially available magnet was initially developed by General Motors and Sunitomo Special metals in 1982. There are generally two methods of manufacturing neodymium magnets. First, the Classical powder sintered magnet process and second, the Rapid Solidification or bonded magnet process. The former method is the classical metallurgy method of extraction of metal which includes the melting of materials in the furnace, and then casting into the moulds and then cooling down.
The later is a newer technology which is a hybrid technique involving sinteration of clay like mixture which can be customized into different shapes and sizes.
- Properties: Magnets are characterized on the basis of their magnetic energy product which simply means magnetic flux per unit volume. Higher the value, stronger is the magnet. Other properties, on the basis of which, magnets are classified, are namely remanence, coercivity, energy product and Curie temperature. Remanence is the measurement of magnetic field strength. Coercivity is the resistance of the magnet to get demagnetized. Energy product is the density of the magnetic energy and Curie Temperature is the temperature at which the magnet loses its magnetic power. Sometimes, neodymium magnets are so strong that they may prove hazardous if body parts get pinches between two magnets.
- Application: Greater strength and higher coercivity of neo magnets makes them highly improvisational among other magnets of its class like alnico and ferrite magnets. They have been vastly used in communication and audio devices like headphones, loud speakers, tape recorders and cassettes. The most common use of neo magnets is in manufacturing of computer hardware specially hard drives and optical drives. Head actuator is the most essential part of a hard drive which is made by neo magnets. In the radiology field, neo magnets are used in the process of Magnetic Resonance Imaging and
- surgical tools and equipment. They are also used in manufacturing electrical motors like servomotors and synchronous motors. The assorted neodymium magnets
- pertinences in various daily usable products like pushpins, map pins, door knobs and locks and many others. The new applications of neo magnets include the replacement of traditional pushpins by the new magnetic push pins. These magnetics pushpins are of at most importance in day to day life.