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US 10,373,746 B2Granted
Ferrite sintered magnet
AssigneeTDK Corporation
InventorHiroyuki Morita
Life of this patent
Estimating the term…
Abstract
A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca1-w-xLawAxFezComO19. In the formula (1), “w”, “x”, “z”, and “m” satisfy a formula (2) of 0.30≤w≤0.50, a formula (3) of 0.08≤x≤0.20, a formula (4) of 8.55≤z≤10.00, and a formula (5) of 0.20≤m≤0.40. In the formula (1), “A” is at least one kind of element selected from a group consisting of Sr and Ba. Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr2O3.
Claims20
A ferrite sintered magnet comprising a composition expressed by a following formula (1),
- Ca1-w-xLawAxFezComO19 (1)
- wherein “w”, “x”, “z”, and “m” in the formula (1) satisfy following formulae (2), (3), (4), and (5),
- 0.30≤w≤0.50 (2)
- 0.08≤x≤0.20 (3)
- 8.55≤z≤10.00 (4)
- 0.20≤m≤0.40 (5)
- “A” in the formula (1) is at least one kind of element selected from a group consisting of Sr and Ba,
- Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr2O3, and
- S is further contained at more than 0 ppm to less than 100 ppm.
6 more elements
A ferrite sintered magnet comprising a composition expressed by a following formula (1),
- Ca1-w-xLawAxFezComO19 (1)
- wherein “w”, “x”, “z”, and “m” in the formula (1) satisfy following formulae (2), (3), (4), and (5),
- 0.30≤w≤0.50 (2)
- 0.08≤x≤0.20 (3)
- 8.55≤z≤10.00 (4)
- 0.20≤m≤0.40 (5)
- “A” in the formula (1) is at least one kind of element selected from a group consisting of Sr and Ba,
- Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr2O3, and
- Al is contained at 0.01 mass % to 0.97 mass % in terms of Al2O3.
6 more elements
Dependencies are inferred from the claim text.