12mm Neodymium Cube Magnets w/ Au Coating

12mm Neodymium Cube Magnets w/ Au Coating, NdFeB Cube, Strong Cube Magnet, Cube Magnet, Cube Neodymium Magnet, N40 Neodymium Magnet, Gold Coating Neodymium Magnet

Product Name: 12mm Neodymium Cube Magnets w/ Au Coating
Magnet ID:Cube-12mm-N40-Au
+ Highest Energy of All Permanent Magnets
+ Moderate Temperature Stability
+ High Coercive Strength
+ Moderate Mechanical Strength
Our Superiority: Customized is Available!

Rare Earth magnets exhibit uniaxial magnetocrystalline anisotropy i.e. they have a unique axis crystal structure corresponding with the easy axis of magnetisation. In the case of Nd2Fe14B, the easy axis of magnetisation is the c-axis of the complex tetragonal structure. In the presence of an external magnetizing field, it aligns along the c-axis, becoming capable of being fully magnetised to saturation with a very high coercivity.

Before the pressed NdFeB magnet is released it is given a demagnetising pulse to leave it unmagnetised. The compacted magnet is termed a ‘green’ magnet – it is easy to force to crumble apart and its magnetic performance is not good. The ‘green’ Neodymium magnet is then sintered to give it its final magnetic properties. The sintering process is carefully monitored (a strict temperature and time profile has to be applied) and occurs in an inert (oxygen free) atmosphere (e.g. argon). If oxygen is present, the resultant oxides destroy the magnetic performance of the NdFeB. The sintering process also causes shrinkage of the magnet as the powder fuses together. The shrinkage gives a magnet close to the required shape but the shrinkage is usually uneven (e.g. a ring may shrink to become an oval). At the end of the sintering process a final rapid quench is applied to rapidly cool the magnet. This is to minimize the unwanted production of ‘phases’ (in simplified terms, variants of the alloy with poor magnetic properties) that occurs at temperatures below the sintering temperature. A rapid quench maximizes the magnetic performance of NdFeB. Because the sintering process causes an uneven shrinkage, the shape of the Neodymium magnet will not be to the required dimensions.