| abstract |
PROBLEM TO BE SOLVED: To provide a mixed magnetic powder that secures electrical insulation while being a mixed powder containing a metal magnetic powder, and a manufacturing method thereof, and a sheet material and a manufacturing method using the same. SOLUTION: By mass%, Cr: 1.0 to 30.0%, Al: 1.0 to 8.0%, and the balance is substantially 20% by mass or more of alumina on the surface of the powder consisting essentially of Fe. A mixed powder of an Fe-Cr-Al magnetic powder and an alumina powder in which an oxide film containing a self-generated oxide is included, and the particle size distribution of the mixed powder is mainly composed of the Fe-Cr-Al magnetic powder The mixed magnetic powder has two peaks in which the particle size peak is in the range of 30 to 200 μm and the particle size peak mainly composed of the alumina powder is in the range of 1 to 20 μm. This mixed magnetic powder is a mixture of Fe-Cr-Al magnetic powder and alumina powder having the above composition range and particle size peak, which is heat treated in an oxidizing atmosphere at 800 to 1200 ° C. and then pulverized. Can be obtained. [Selection] Figure 1 |