Main production process
1.Milling: The process begins by grinding the raw materials (aluminum, nickel, cobalt, etc.) into a fine powder.
2.Pressing: The powdered mixture is then pressed under high pressure in a mold shaped like the desired magnet.
3.Sintering: Next, the pressed material is heated in a hydrogen furnace at a very high temperature. This process, called sintering, fuses the individual particles together, forming a solid magnet.
4.Cooling: A crucial step in determining the magnet’s properties is cooling. Cooling with an external magnetic field creates anisotropic magnets with a preferred direction of magnetism. On the other hand, cooling without an external field results in isotropic magnets with magnetism in all directions.
5.Magnetizing (Optional Pressing): Finally, the magnet is magnetized using a solenoid magnetizer that generates a powerful electrical pulse. In some cases, the magnet may undergo additional pressing to achieve the final desired shape.
Properties of Sintered AlNiCo Magnets
Sintered AlNiCo magnets offer a compelling combination of strength and versatility. They boast high magnetic flux density, making them powerful for their size. Additionally, these magnets excel in harsh environments due to their impressive resistance to corrosion and high temperatures, capable of withstanding up to 840-930°F. Their compact size and excellent dimensional tolerances often eliminate the need for further processing after production. This translates to cost-effective manufacturing. Sintered AlNiCo magnets find applications in various fields, including temperature and electronic sensors in automobiles, magnetrons, regulators, motors, and meters.