Magnetic material and rotating electric machine
A magnetic material according to an embodiment includes at least one first element X selected from the group consisting of Fe, Co and Ni; a matrix phase; and a particle including C and at least one second element Y selected from Ta, W, Nb and Mo.
1 . A magnetic material comprising Si and at least one first element X selected from the group consisting of Fe, Co and Ni;
a matrix phase; and
a particle including the first element X, C and at least one second element Y selected from Ta, W, Nb and Mo,
wherein a ratio of Si is 1 atomic % or more and 25 atomic % or less with respect to the entire magnetic material.
2 . The magnetic material according to claim 1 , wherein the particle includes a cubic crystal structure and includes a compound phase comprising X 3 Y 3 C.
3 . The magnetic material according to claim 1 , wherein the particle is present at a grain boundary of the matrix phase.
4 . The magnetic material according to claim 1 , wherein the first element X is Co and the second element Y is Ta.
5 . The magnetic material according to claim 1 , wherein the particle includes at least one of Fe or Si.
6 . The magnetic material according to claim 1 , wherein the particle includes an element included in the matrix phase in which the particle is provided.
7 . The magnetic material according to claim 1 , wherein the particle has a cubic crystal structure of Ta 3 Co 3 C.
8 . The magnetic material according to claim 1 , wherein the matrix phase includes a body-centered cubic crystal structure, and the particle is provided in the matrix phase.
9 . The magnetic material according to claim 1 , wherein the particle lattice is oriented with respect to the matrix phase lattice.
10 . The magnetic material according to claim 9 , wherein the particle oriented with respect to the matrix phase has a lattice mismatch of 10% or less with respect to the matrix phase.
11 . The magnetic material according to claim 9 , wherein two or more of the particles included in the matrix phase are lattice oriented with respect to each other.
12 . The magnetic material according to claim 9 , wherein the particle lattice is oriented at (020) particle //(0-10) matrix phase or (20-2) particle //(−101) matrix phase , with respect to the matrix phase lattice.
13 . The magnetic material according to claim 9 , wherein the particle lattice is oriented at (0-40) particle /(0-10) matrix phase or (404) particle //(−101) matrix phase with respect to the matrix phase lattice.
14 . The magnetic material according to claim 1 , wherein a plurality of particles are included in the magnetic material, and the mean particle size of the particles is 1 nm or more and 10 μm or less.
15 . The magnetic material according to claim 1 , wherein a Si ratio of a surface portion of the magnetic material is 1.1 times or more with respect to a Si ratio of a central portion of the magnetic material.
16 . The magnetic material according to claim 1 , wherein the first element is Fe and Co, and a ratio of Si is 1 atomic % or more and 25 atomic % or less with respect to the entire magnetic material.
17 . The magnetic material according to claim 1 , wherein a density of the magnetic material is 6 g/cm 3 or higher.
18 . The magnetic material according to claim 1 , wherein a three-point bending strength of the magnetic material is 200 MPa or more.
19 . The magnetic material according to claim 1 , wherein a magnetic coercivity is 80 A/m or less.
20 . The magnetic material according to claim 1 , wherein a saturation magnetization of the magnetic material is 1.7 T or more.
21 . The magnetic material according to claim 1 , wherein the particle is present at a surface of the magnetic material, at a grain boundary of the matrix phase or in a grain of the matrix material.
22 . A rotating electric machine comprising the magnetic material according to claim 1 .