Processing begins with the controlled blending of fine metal powders consisting
primarily of aluminum, nickel, cobalt and iron.
A wax lubricant is added at this stage to aid the subsequent pressing process.
The mixed powder is then compacted to form the required shape using varied press
technology. Close dimensional control is maintained by statistical process
control (SPC), both at this stage and after sintering.
De-waxing through a low temperature furnace removes the pressing lubricant prior
to sintering.
Sintering is undertaken at high temperature under a protective atmosphere of
hydrogen. An homogeneous fully dense alloy results.
Further heat treatment is required for most alloys to introduce improved
magnetic properties. Anisotropic properties can be induced by additional
specialized heat treatment. For those materials that have been heat treated, the
final part of the process is multi-stage tempering which reduces brittleness but
more importantly, further enhances the magnetic performance and stabilizes the
material.
To achieve very high dimensional control specific surfaces can be machined to
very close tolerances using high volume grinding machines.
Final inspection before dispatch or subsequent assembly, ensures that all parts
conform both physically and magnetically to specification.
EAM’s knowledgeable product development team will assist you
in choosing the optimal combination of binder and magnet
material for your specific application.
