Magnetic material and manufacturing method thereof
A powder raw material is prepared by mixing at least two kinds of powders selected from a powder A, a powder B, a powder C, and a powder D. A sintered body of a magnetic material having an NaZn 13 crystal structure phase is formed by heating the powder raw material while applying a pressure treatment. The powder A is at least one of elemental powder of element R selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. The powder B is at least one of elemental powder of element T selected from Fe, Co, Ni, Mn, and Cr. The powder C is at least one of elemental powder of element M selected from Si, B, C, Ge, Al, Ga, and In. The powder D is a compound powder composed of at least two kinds of elements selected from the element R, the element T, and the element M.
1. A manufacturing method of a magnetic material, comprising:
preparing a powder raw material by mixing at least two of powders selected from a powder A, a powder B, a powder C, and a powder D, where the powder A is at least one selected from an elemental powder of element R, and the element R is at least one selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, the powder B is at least one selected from an elemental powder of element T, and the element T is at least one selected from Fe, Co, Ni, Mn, and Cr, the powder C is at least one selected from an elemental powder of element M, and the element M is at least one selected from Si, B, C, Ge, Al, Ga, and In, and the powder D is at least one selected from compound powders composed of at least two of elements among the element R, the element T, and the element M; and
forming a sintered body of the magnetic material having an NaZn 13 crystal structure phase by heating the powder raw material while applying a pressure.
2. The manufacturing method according to claim 1 , wherein the powder raw material comprises the element R in a range of not less than 4 atom percent nor more than 15 atom percent, the element T in a range of not less than 60 atom percent nor more than 93 atom percent, and the element M in a range of not less than 3 atom percent nor more than 25 atom percent.
3. The manufacturing method according to claim 1 , wherein the powder raw material comprises La in a range of not less than 5 atom percent nor more than 10 atom percent as the element R, Fe in a range of not less than 70 atom percent nor more than 91 atom percent as the element T, and Si in a range of not less than 4 atom percent nor more than 20 atom percent as the element M.
4. The manufacturing method according to claim 3 , wherein the powder raw material comprises Fe of 79 atom percent or more.
5. The manufacturing method according to claim 3 , wherein the powder raw material further comprises Co in a range of not less than 0.5 atom percent nor more than 15 atom percent as the element T.
6. The manufacturing method according to claim 1 , wherein the powder D comprises at least one selected from La 5 Si 3 , La 3 Si 2 , LaSi, and LaSi 2 .
7. The manufacturing method according to claim 1 , wherein the powder raw material is heated by applying a current.
8. The manufacturing method according to claim 1 , wherein the forming the sintered body comprises applying the pressure and a pulse current simultaneously to the powder raw material.
9. The manufacturing method according to claim 1 , wherein the powder A, the powder B, the powder C, and the powder D have average particle sizes of 50 μm or less.
10. The manufacturing method according to claim 1 , wherein the powder A, the powder B, the powder C, and the powder D have the average particle sizes of 20 μm or less.
11. The manufacturing method according to claim 1 , wherein an oxygen content of the magnetic material is less than 2 atom percent.
12. The manufacturing method according to claim 1 , wherein an oxygen content of the magnetic material is less than 0.2 atom percent.
13. The manufacturing method according to claim 1 , wherein the magnetic material comprises a hydrogen content not less than 2 atom percent nor more than 22 atom percent.
14. The manufacturing method according to claim 2 , wherein the powder raw material comprises the element T in a range of not less than 70 atom percent nor more than 91 atom percent.
15. The manufacturing method according to claim 2 , wherein the powder raw material comprises the element M in a range of not less than 4 atom percent nor more than 20 atom percent.
16. The manufacturing method according to claim 7 , wherein the applied current is a pulse current.
17. The manufacturing method according to claim 8 , wherein the pressure is applied under a vacuum condition.
18. The manufacturing method according to claim 8 , wherein the pressure is applied under an inert gas condition.
19. The manufacturing method according to claim 8 , wherein the applied pressure is in a range of 5 MPa and 100 MPa.
20. The manufacturing method according to claim 8 , wherein the sintering temperature is in a range of 800 and 1400° C.