| 摘要 |
PROBLEM TO BE SOLVED: To provide: a powder-compact magnetic core which delivers an excellent performance in view of any of the standard deviation of the density, the magnetic property and the hardness; and a method for manufacturing such a powder-compact magnetic core.SOLUTION: A method for manufacturing a powder-compact magnetic core comprises the steps of: mixing powder of a magnetic material, powder of glass having a transition point lower than a crystallization temperature of the magnetic material powder, and a binding resin together; press-compacting the resultant mixture at a room temperature; and performing a heat treatment on the resultant compact at a temperature lower than the crystallization temperature of the magnetic material powder in a non-reducing atmosphere. The difference between the transition point of the glass powder, and the crystallization temperature of the magnetic material is 50°C or more. The difference between a crystallization temperature of the glass and the crystallization temperature of the magnetic material powder is 50°C or less. The quantity of the mixed glass is in a range of 0.5-5 wt% of that of the magnetic material powder. It is preferable to decide the quantity of the mixed glass according to the magnetic permeability of the powder-compact magnetic core to be manufactured. Further, it is preferable that the glass powder has a particle diameter of 0.5-5 μm. In mixing the magnetic material powder and the glass powder, a lubricative resin may be added thereto. |
