Cast Alnico magnets are produced through a casting process that involves melting and solidifying an alloy of aluminum (Al), nickel (Ni), cobalt (Co), iron (Fe), and other elements like copper and titanium. The process ensures high magnetic performance and durability.
Manufacturing Process of Cast Alnico Magnets:
- تحضير المواد الخام
The required elements (Al, Ni, Co, Fe, Cu, Ti) are precisely measured and mixed.
The composition varies depending on the grade and application of the Alnico magnet.
- Melting & Casting
The metal alloy is melted at high temperatures (around 1750°C / 3182°F) in an induction furnace.
The molten metal is then poured into sand molds shaped according to the desired magnet form.
The molds allow controlled cooling, helping to form the magnet’s grain structure.
- Heat Treatment & Annealing
The solidified magnet is heated again to around 1250°C (2282°F) and then slowly cooled.
This process helps optimize the magnetic properties by aligning the crystal structure.
- Grinding & Machining
Alnico is hard and brittle, so it requires grinding or machining with diamond tools to achieve precise shapes and tolerances.
Standard shapes include cylinders, bars, horseshoes, and custom designs.
- المغنطة
The magnet is placed in a strong magnetic field to align its domains and permanently magnetize it.
The strength of the applied field determines the final magnetic properties.
- الطلاء والتشطيب (اختياري)
Although Alnico is highly corrosion-resistant, some applications may require painting, plating, or lacquering for added protection and aesthetics.
Key Features of Cast Alnico Magnets:
✔ High temperature resistance (up to 550°C / 1022°F).
✔ Strong and stable magnetic properties.
✔ Corrosion-resistant without coating.
✔ Hard and brittle (requires careful handling and machining).
