Method for manufacturing dust core and raw material powder for dust core

2:

• The method for manufacturing a dust core according to claim 1, wherein the melting point Tm of the metal soap is higher than or equal to 200° C.

3:

• The method for manufacturing a dust core according to claim 1, wherein the temperature Td of the mold is lower than or equal to 130° C.

4:

• The method for manufacturing a dust core according to claim 1, wherein a Vickers hardness of the iron alloy particles is greater than or equal to 200 HV.

6:

• The method for manufacturing a dust core according to claim 1, wherein a content of the coated iron alloy powder in the raw material powder is greater than or equal to 15% by mass and less than or equal to 40% by mass.

7:

• The method for manufacturing a dust core according to claim 1, wherein a content of the metal soap in the raw material powder is greater than or equal to 0.02% by mass and less than or equal to 0.80% by mass.

8:

• The method for manufacturing a dust core according to claim 1, wherein each of the iron alloy particles contains at least one additive element selected from Si and Al.

9:

• The method for manufacturing a dust core according to claim 1, wherein a thickness of each of the insulating coating layer in the coated pure iron powder and the insulating coating layer in the coated iron alloy powder is greater than or equal to 30 nm and less than or equal to 300 nm.

10:

• The method for manufacturing a dust core according to claim 1, wherein, the step of performing a heat treatment of the molded article is carried out under an atmosphere having an oxygen concentration of greater than 0 ppm by volume and less than or equal to 10000 ppm by volume at a temperature of higher than or equal to 400° C. and lower than or equal to 1000° C. and with a retention time of longer than or equal to 10 minutes and shorter than or equal to 60 minutes.