Strong 3M Adhesive NdFeB Magnet

Strong 3M Adhesive NdFeB Magnet, Strong NdFeB Magnet, 3M Adhesive Disc Magnet, 3M Self Adhesive Magnet, Magnets With 3M Tape, NdFeB Magnet with 3M Adhesive, Self Adhesive Strong Magnet

Product Name:Strong 3M Adhesive NdFeB Magnet
Magnet ID:Adhesive-Disc-Ø10×1-N38
+ Highest Energy of All Permanent Magnets
+ Moderate Temperature Stability
+ High Coercive Strength
+ Moderate Mechanical Strength
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Neodymium Iron Boron magnets are a type of rare earth alloy that typically has two atoms of Neodymium (Nd), 14 atoms of Iron (Fe), and one atom of Boron (B) as its primary elements, hence their chemical composition Nd2Fe14B, which is commonly abbreviated as NdFeB. There are other elements that are used to increase the coercivity, to gain lower oxidation characteristics, and to obtain other desirable characteristics. These elements are used to “dope” the alloy and are generally found in small quantities (<10% by weight).

Sintered Neodymium Iron Boron Magnets
The sintered Neodymium Iron Boron magnet is produced by the OPS (orient-press-sinter) method. A crystalline alloy of Neodymium, Iron, and Boron is ground to a sub-micron powder using a ball mill, then aligned in a strong magnetic field, and pressed into a basic shape. The resultant “block” is then sintered, thereby fusing the material into a solid metal.

Generally, Neodymium Iron Boron magnets are sensitive to changes in temperature (reversible temperature coefficients being around -0.13%/°C). Additionally, they are more prone to oxidation than any other magnet alloy. Coating or plating is generally recommended unless using advanced alloys, such as HSMAG’s N3080, N3275, and N4467. HSMAG’s advanced grades are developed specifically for applications where the application of coating or plating is not desired. These advanced grades have oxidation rates that are far below the average Neodymium Iron Boron alloys, making them ideal for applications that require post assembly processing, due to tight tolerances in the final assembly state.

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.