Ferrite sintered magnet, ferrite particles, bonded magnet, motor, and generator
AssigneeTDK Corporation
InventorsJunnichi Nagaoka, Hitoshi Taguchi, Yuichi Sugawara, Jo Sato
Life of this patent
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Abstract
Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B2O3. 0.2≤x≤0.8 (1) 0.1≤y≤0.65 (2) 3≤m≤14 (3)
Claims16
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x≤0.8 (1)
- 0.1≤y≤0.65 (2)
- 3≤m<14 (3), and
- a content of B is more than 0.2% by mass and 0.6% by mass or less in terms of B2O3, and
- wherein an absolute value of temperature coefficient of Br of the ferrite sintered magnet is less than |0.187|%/° C.
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x≤0.8 (1)
- 0.1≤y≤0.65 (2)
- 3≤m<14 (3), and
- a content of B is more than 0.2% by mass and 0.6% by mass or less in terms of B2O3, and
- wherein a temperature coefficient of HcJ of the ferrite sintered magnet is 0%/° C. or less.
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (7), (2), and (8) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x<0.55 (7)
- 0.1≤y≤0.65 (2)
- 7.5<m<14 (8), and
- a content of B is more than 0.2% by mass and 0.6% by mass or less in terms of B2O3.
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x≤0.8 (1)
- 0.1≤y≤0.65 (2)
- 3≤m<14 (3), and
- a content of B is from 0.1% to 0.6% by mass in terms of B2O3,
- wherein an absolute value of temperature coefficient of Br of the ferrite sintered magnet is less than |0.187|%/° C., and
- wherein HcJ of the ferrite sintered magnet at 20° C. is 4900 Oe or more.
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x≤0.8 (1)
- 0.1≤y≤0.65 (2)
- 3≤m<14 (3), and
- a content of B is from 0.1% to 0.6% by mass in terms of B2O3,
- wherein a temperature coefficient of HcJ of the ferrite sintered magnet is 0%/° C. or less, and
- wherein HcJ of the ferrite sintered magnet at 20° C. is 4900 Oe or more.
A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein
- x, y, and m satisfy the following Equations (7), (2), and (8) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba:
- 0.2≤x<0.55 (7)
- 0.1≤y≤0.65 (2)
- 7.5<m<14 (8), and
- a content of B is from 0.1% to 0.6% by mass in terms of B2O3, and
- wherein HcJ of the ferrite sintered magnet at 20° C. is 4900 Oe or more.
Dependencies are inferred from the claim text.