Plurality of flaky magnetic metal particles, pressed powder material, and rotating electric machine
Provided is a plurality of flaky magnetic metal particles of embodiments, each flaky magnetic metal particle having a flat surface having either or both of a plurality of concavities and a plurality of convexities, the concavities or convexities being arranged in a first direction and each having a width of 0.1 μm or more, a length of 1 μm or more, and an aspect ratio of 2 or higher; and a magnetic metal phase containing at least one primary element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni). The flaky magnetic metal particles have an average thickness of between 10 nm and 100 μm inclusive, and the average value of the ratio of the average length within the flat surface with respect to the thickness is between 5 and 10,000 inclusive.
1. A pressed powder material, comprising:
a plurality of flaky magnetic metal particles, each flaky magnetic metal particle having a flat surface and a magnetic metal phase containing at least one primary element selected from the group consisting of Fe, Co, and Ni, and the flaky magnetic metal particles having an average thickness of between 10 nm and 100 μm inclusive and an average value of the ratio of the average length within the flat surface with respect to the thickness of between 5 and 10,000 inclusive; and
an intercalated phase existing between the flaky magnetic metal particles, and the intercalated phase containing at least one secondary element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F),
wherein in the pressed powder material, the flat surfaces are oriented to be parallel to a plane of the pressed powder material and have a direction-induced coercivity difference within the plane.
2. The pressed powder material according to claim 1 , wherein the proportion of the direction-induced coercivity difference within the plane is 1% or higher.
3. The pressed powder material according to claim 1 , wherein the magnetic metal phase contains at least one additive element selected from the group consisting of B, Si, Al, C, Ti, Zr, Hf, Nb, Ta, Mo, Cr, Cu, W, P, N, Ga, and Y.
4. The pressed powder material according to claim 1 , wherein the flat surface has either or both of a plurality of concavities and a plurality of convexities, the concavities or convexities being arranged in a first direction, and each of the concavities and convexities has a width of 0.1 μm or more, a length of 1 μm or more, and an aspect ratio of 2 or higher.
5. The pressed powder material according to claim 1 , wherein the lattice strain of the flaky magnetic metal particles is between 0.01% and 10% inclusive.
6. The pressed powder material according to claim 1 , wherein the intercalated phase contains a resin having a weight reduction percentage after heating for 3,000 hours at 180° C. of 5% or less.
7. The pressed powder material according to claim 1 , wherein the pressed powder material has a weight reduction percentage after heating for 3,000 hours at 180° C. of 5% or less.
8. The pressed powder material according to claim 1 , wherein the intercalated phase contains a resin having a glass transition temperature of 180° C. or higher.
9. The pressed powder material according to claim 1 , wherein the intercalated phase contains a resin not having a glass transition point up to the thermal decomposition temperature.
10. The pressed powder material according to claim 1 , wherein the intercalated phase comprises a polyimide resin.
11. The pressed powder material according to claim 10 , wherein the polyimide resin contains a repeating unit represented by the following Chemical Formula (1):
wherein in Chemical Formula (1), R represents any one of a biphenyl structure, a triphenyl structure, and a tetraphenyl structure; and R′ represents a structure having at least one or more aromatic rings in the structure.
12. A rotating electric machine, comprising the pressed powder material according to claim 1 .