Powder for magnetic core, method for manufacturing powder for magnetic core, and dust core

A method for manufacturing a powder for a magnetic core comprising:

• a siliconizing treatment process of performing a siliconizing treatment on a surface of a soft magnetic powder that includes:
• bringing a powder for siliconizing that contains at least a silicon compound into contact with the surface of the soft magnetic powder;
• detaching elemental silicon from the silicon compound by heating the powder for siliconizing;
• and
• performing the siliconizing treatment by causing the detached elemental silicon to permeate and diffuse into a surface layer of the soft magnetic powder;
• and the method further comprising a process of performing a gradual oxidizing treatment on the soft magnetic powder after the siliconizing treatment,
• wherein the powder used for siliconizing is one of a first mixed powder obtained by mixing at least the powder of silicon dioxide and the powder of silicon carbide, a second mixed powder obtained by mixing the powder containing at least silicon dioxide and a powder containing either or both of a metal carbide and a carbon allotrope, and a third mixed powder obtained by mixing the powder containing at least silicon carbide and a powder of at least one kind from among powders composed of metal oxides.