Composite magnetic material and method of preparing the same
AssigneeBYD Company Limited
InventorsQing Gong, Xin Du, Xiaofeng Cheng
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Abstract
The present invention discloses a composite magnetic material. The composite magnetic material may comprise an Nd—Fe—B alloy and a Fe-based soft magnetic alloy having the general formula of Fe100-x-y-z-aAxRaSiyBz. A may be at least one element selected from Cu and Au. R may be at least one element selected from the group consisting of Ti, Zr, Hf, Mo, Nb, Ta, W and V. And the x, a, y, and z may satisfy: 0≦x≦3, 0≦a≦10, 0≦y≦20 and 2≦z≦25. The present invention further discloses a method of preparing the composite magnetic material as described above. According to the present invention, the composite magnetic material may have an enhanced magnetic energy product and residual magnetism respectively.
Claims11
A composite magnetic material, comprising:
- a Nd—Fe—B alloy powder;
- and
- a nano Fe-based soft magnetic alloy powder, which specified in atomic percentage is:
- Fe100-x-y-z-aAxRaSiyBz, wherein:
- A is at least one element selected from the group consisting of Cu and Au;
- R is at least one element selected from the group consisting of Ti, Zr, Hf, Mo, Nb, Ta, W and V;
- and wherein 0≦x≦3, 0≦a≦10, 0<y≦20 and 2≦z≦25.
A method of preparing a composite magnetic material, the method comprising:
- the composite magnetic material comprising:
- a Nd—Fe—B alloy powder;
- and a nano Fe-based soft magnetic alloy powder which specified in atomic percentage is:
- Fe100-x-y-z-aAxRaSiyBz, wherein:
- A is at least one element selected from the group consisting of Cu and Au;
- R is at least one element selected from the group consisting of Ti, Zr, Hf, Mo, Nb, Ta, W and V;
- and wherein 0≦x≦3, 0≦a≦10, 0<y≦20 and 2≦z≦25;
- mixing the Nd—Fe—B alloy powder and the nano Fe-based soft magnetic alloy powder to form a mixture;
- pressing the mixture in a magnetic field to form a blank;
- sintering the blank under a first temperature;
- and
- tempering the blank under a second temperature, wherein the sintering and/or tempering steps occur under a first atmosphere.
Dependencies are inferred from the claim text.