Machining and tolerances
Ceramic magnets are very hard and brittle, consequently
machining must be done with a diamond wheel, and is easier when done prior
to magnetization. Standard tolerances for ceramic magnet dimensions are
+/-.005" for ground dimensions and +/- 2% of feature size for as
sintered dimensions. Because of their brittleness these magnets will not
withstand impact or flexing. We recommend that they not be used for structural
purposes. Ceramic magnets are chemically inert non-conductors, which is
a benefit in many applications. However, this feature does eliminate the
use of the EDM process to produce samples or special shapes.
Common applications
DC motors •
Magnetic separators •
MRI • Automotive
sensors • Craft
projects • Refrigerator
magnets
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Temperature constraints
and methods of magnetization
Maximum operating temperature for ceramic magnets is 250°C. Although you
will experience magnetic losses when operating at elevated temperatures,
the losses are recovered when the material is brought down to normal ambient
temperature. However, operating in very cold temperatures (-20°C) can
result in permanent losses of magnetic strength unless the circuit has
been designed for such extremes. Magnetization: ceramic magnets must be
magnetized in the direction of orientation, which is the same as the direction
of pressing.
Added value services
Adams stocks a variant of square and rectangular blocks, discs and rings
in ceramic 1,5 & 8 grades. Other configurations can be produced but
are not stocked except for specific customer requirements. The standard
sizes can be cut and ground to meet your specific requirements. We also
produce stock and custom magnetic assemblies using ceramic magnets.
Download product specifications in PDF format. |
