Method of manufacturing a manganese bismuth alloy
AssigneeFord Global Technologies, LLC
InventorWanfeng Li
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Abstract
A method of increasing volume ratio of magnetic particles in a MnBi alloy includes operating a jet miller fed with a MnBi alloy powder containing magnetic particles and non-magnetic particles with gas flow parameters selected such that, only for the magnetic particles, a gas drag force is greater than a centrifugal force within the jet miller to separate the magnetic particles from the non-magnetic particles.
Claims21
A method of increasing volume ratio of magnetic particles in a MnBi alloy comprising:
- operating a jet miller fed with a MnBi alloy powder containing magnetic particles and non-magnetic particles with gas flow parameters selected such that, only for the magnetic particles, a gas drag force is greater than a centrifugal force within the jet miller to separate the magnetic particles from the non-magnetic particles.
A method of separating magnetic and non-magnetic phases in a MnBi alloy comprising:
- operating a jet miller fed with a MnBi alloy powder containing magnetic particles and non-magnetic particles with gas flow parameters selected such that, only for the magnetic particles, a gas drag force is greater than a centrifugal force within the jet miller, and only for non-magnetic particles, the gas drag force is lower or equal to the centrifugal force within the jet miller to separate the magnetic particles from the non-magnetic particles;
- and
- collecting the separated magnetic particles.
A method of producing a MnBi alloy comprising up to 97 volume % magnetic phase, the method comprising:
- operating a jet miller fed with a MnBi alloy powder containing magnetic particles and non-magnetic particles with gas flow parameters selected such that, only for the magnetic particles, a gas drag force acting on the magnetic and non-magnetic particles is greater than a centrifugal force acting on the magnetic and non-magnetic particles within the jet miller to separate the magnetic particles from the non-magnetic particles;
- collecting the magnetic particles having up to 95 volume % of magnetic phase;
- and
- repeating the operating step with the magnetic particles to increase volume % of the magnetic phase to up to 97 volume %.
Dependencies are inferred from the claim text.