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US 7,018,487 B2Granted
Magnet containing low rare earth element and method for manufacturing the same
AssigneeNissan Motor Co., Ltd.
InventorsHideaki Ono, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano
Life of this patent
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Abstract
An exchange-spring magnet is prepared using a magnet alloy containing Ta and C in addition to Nd, Fe and B. This exchange-spring magnet uses the magnet alloy prepared by a liquid quenching method or a mechanical alloying method. Further, by subjecting the magnetic alloy having a part set in an amorphous state to heat treatment, an exchange-spring magnet exhibits good properties regarding magnetic flux density and coercive force.
Claims13
An exchange-spring magnet comprising:
- a magnet alloy including Neodymium, Iron, Boron, Tantalum, and Carbon,
- wherein the exchange-spring magnet contains an α-Fe phase, a Nd2Fe14B phase, and a TaC phase, and
- wherein an amount of Carbon is within a range from 1.5 to 4.5 atom %, and an amount of Tantalum is within a range from 1.5 to 4.5 atom %.
A motor, comprising:
- an exchange-spring magnet, the exchange-spring magnet comprising:
- a magnet alloy including Neodymium, Iron, Boron, Tantalum, and Carbon,
- wherein the exchange-spring magnet contains an α-Fe phase, a Nd2Fe14B phase, and a TaC phase, and wherein an amount of Carbon is within a range from 1.5 to 4.5 atom %, and an amount of Tantalum is within a range from 1.5 to 4.5 atom %.
A sensor, comprising:
- an exchange-spring magnet, the exchange spring magnet comprising:
- magnet alloy including Neodymium, Iron, Boron, Tantalum, and Carbon,
- wherein the exchange-spring magnet contains an α-Fe phase, a Nd2Fe14B phase, and a TaC phase, and wherein an amount of Carbon is within a range from 1.5 to 4.5 atom %, and an amount of Tantalum is within a range from 1.5 to 4.5 atom %.
Dependencies are inferred from the claim text.