The properties of permanent magnets and magnetic powder generally, include a Rare-Earth metal, as well as Iron (Fe) and Boron (B). More commonly used rare-earth metal is Neodymium (Nd). These materials are derived from the strong magnetocrystalline anisotropy and high saturation magnetization of the compound RE2Fe14B1.
Newland Magnetic powders, quench magnet powder, NdFeB powder, ferrite powder, spun NdFeB powder are based upon Nd-Fe-B alloy compositions that are quickly solidified from their molten state at high cooling rates. This rapid solidification results in a material that has a precise grain structure. Due to the small grain size, these materials are magnetically isotropic. Unlike the very fine, anisotropic powders that are used to manufacture sintered NdFeB magnets, Newland’s powder is stable against oxidation-forced demagnetization. This makes Newland powders easily ready for making bonded permanent magnets.
We make our powders using a process known as “Jet Casting”. It involves melting an ingot of Nd-Fe-B, and then shooting the metal under high pressure onto the surface of a rotating metal wheel that is kept at cool temperatures while the molten metal is cooled. The material solidifies into a small metal ribbon that is about 35 µm (micrometers) thick and 1-3 mm wide. By controlling variables such as the flow rate of the metal, the wheels rotating speed, the cooling rate; we can achieve optimum magnetic properties.
The gathered ribbon is milled into a platelet, which is treated with heat to achieve desired magnetic properties.
We even use another process that allows for rapid solidification, and still gives the fine, spherical NdFeB powders. Much like a centrifuge, it is known as “spinning-cup atomization”. The molten metal is ejected into the surface of a rapidly spinning cup.
As it leaves the rim of the spinning cup, the metal forms droplets that form into very small spheres, solidifying during flight. The powder is collected and then treated with heat to get the desired magnetic properties.
The product range of our magnets covers five kinds of magnetic powder, and all kind of bonded magnets. They can be used in the automobile industry, office automation, electric toys and magnetic curing products,etc. because they have high quality and high strength and they can be made into complicated shapes.
Here we list our product grades and show their applications, which may help in your choice of the correct powder corresponding to Magnequench Inc. (Magnequench Inc. is the biggest company in the world to manufacture spun-melt NdFeB powder. ), you can decide which grade is right for your using detail specifications which you can find in Magnetic Specification webpage.
NM-A ( MQP-A ): High coercivity and resistance to demagnetization. Typically used in DC brush-type motors.
NM-B ( MQP-B ): Low coercivity material with moderate magnetization requirements. Suited for multi-pole stepper and spindle motor applications.
NM-C ( MQP-C ): Similar to MQP-A but with a more stable reversible temperature coefficient. Suitable for magnet applications where improved temperature stability is required.
NM-D ( MQP-D ): Lower coercivity, moderate magnetization requirements and stable temperature coefficient as with MQP-C.
( MQP-O ): Moderate coercivity magnet material for higher temperature applications such as automotive.
( MQP-Q ): Ultra-low coercivity material that yields a higher saturation level at a lower applied magnetizing field.
An appropriate selection for multi-pole applications where high magnetizing fields cannot be achieved. MQP-Q can also be blended with other magnet materials.