Ferrite sintered magnet

Patent metadata

Field	Value
Publication number	US-2017207011-A1
Application number	US-201715400459-A
Country	US
Kind code	A1
Filing date	Jan 6, 2017
Priority date	Jan 15, 2016
Publication date	Jul 20, 2017
Grant date	—

Abstract

A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca 1-w-x La w A x Fe z Co m O 19 . 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 Cr 2 O 3 .

First claim

1 . A ferrite sintered magnet comprising a composition expressed by a following formula (1),
Ca 1-w-x La w A x Fe z Co m O 19   (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≦ 5=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, and Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr 2 O 3 .

2 . The ferrite sintered magnet according to claim 1 , wherein
a relationship between x1 and y1 is in a range surrounded by six points of a1 (0.058, 10.25), b1 (0.119, 10.25), c1 (0.132, 9.30), d1 (0.119, 9.30), e1 (0.100, 8.75), and f1 (0.058, 8.75) in X-Y coordinates having an X-axis and a Y-axis, where x1 is an amount (mass %) of Cr 2 O 3 in the ferrite sintered magnet and is expressed on the X-axis and y1 is a total amount of “z” and “m” in the ferrite sintered magnet and is expressed on the Y-axis.

3 . The ferrite sintered magnet according to claim 1 , wherein w/m is 0.98 to 2.00.

4 . The ferrite sintered magnet according to claim 2 , wherein w/m is 0.98 to 2.00.

5 . The ferrite sintered magnet according to claim 1 , wherein Si is further contained at 0.55 mass % to 1.12 mass % in terms of SiO 2 .

6 . The ferrite sintered magnet according to claim 2 , wherein Si is further contained at 0.55 mass % to 1.12 mass % in terms of SiO 2 .

7 . The ferrite sintered magnet according to claim 3 , wherein Si is further contained at 0.55 mass % to 1.12 mass % in terms of SiO 2 .

8 . The ferrite sintered magnet according to claim 4 , wherein Si is further contained at 0.55 mass % to 1.12 mass % in terms of SiO 2 .

9 . The ferrite sintered magnet according to claim 1 , wherein S is further contained at more than 0 ppm to less than 100 ppm.

10 . The ferrite sintered magnet according to claim 2 , wherein S is further contained at more than 0 ppm to less than 100 ppm.

11 . The ferrite sintered magnet according to claim 3 , wherein S is further contained at more than 0 ppm to less than 100 ppm.

12 . The ferrite sintered magnet according to claim 4 , wherein S is further contained at more than 0 ppm to less than 100 ppm.

13 . The ferrite sintered magnet according to claim 1 , wherein Al is contained at 0.01 mass % to 0.97 mass % in terms of Al 2 O 3 .

14 . The ferrite sintered magnet according to claim 2 , wherein Al is contained at 0.01 mass % to 0.97 mass % in terms of Al 2 O 3 .

15 . The ferrite sintered magnet according to claim 3 , wherein Al is contained at 0.01 mass % to 0.97 mass % in terms of Al 2 O 3 .

16 . The ferrite sintered magnet according to claim 4 , wherein Al is contained at 0.01 mass % to 0.97 mass % in terms of Al 2 O 3 .

Assignees

• Tdk Corp

Inventors

• Morita Hiroyuki

Classifications

• C04B35/634

  Polymers (C04B35/636 takes precedence) · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• C04B2235/3227

  Lanthanum oxide or oxide-forming salts thereof · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B2235/3262

  Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title