Anisotropic sintered ferrite via in-house magnetic press

Problem solved

Applications that cannot take NdFeB (cost, corrosion, or rare-earth supply) still need a directional sintered ferrite with custom machining. This line is a Japan-made ferrite source that also finishes the part and can co-press ceramic, so the buyer is not limited to catalog blocks.

Application contexts

• Small motors and sensors using ferrite rather than NdFeB
• Speakers and industrial devices specified as ferrite
• Custom ferrite shapes that need in-house grind or ceramic co-press

Technical principle

Ferrite powder is pressed (in a magnetic field for the anisotropic grade) and sintered in continuous tunnel kilns. The site dates magnetic-press anisotropic production to 1966 and cites Japanese patents 308120 and 308121. Secondary operations (cut, grind, drill, barrel, ultrasonic clean) are in-house. A 2007 press is described as forming magnet and ceramic in one shot. Magnetic properties are not published on the page.

Typical use cases

• Anisotropic ferrite motor segment where NdFeB is not required
• Custom-machined ferrite for a sensor or speaker
• Magnet-ceramic co-pressed part that would otherwise be assembled