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The project aimed at developing a production method
for injection moulding and
sintering hexagonal ferrite materials with the SrFe12O19 and
BaFe12O19 compositions. Plastic-bound and orientated
permanent magnets of complex shapes of these materials are today produced by injection moulding. Usually, the solid content of the
ferrite powder lies between 60 and 65 vol%. Applications are, for instance,
torque transmission clutches and wheel positioning sensors.
Proper debinding and sintering of injection-moulded ferrite magnets would
increase the density resulting in a significant improvement of the magnetic
properties. By employing a developed temporary binder and suitable sintering
additives for BaFe12O19, injection-moulded parts were
sintered to a density of 96% (of theoretical), with a desired grain size
distribution of 1-3 µm in the material.
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