Soft magnetic composite powder and production method of the same, and production method of soft magnetic compact
一种复合粉末、制造方法的技术,应用在磁性物体、电感/变压器/磁铁制造、磁性材料等方向,能够解决磁特性降低、模具寿命缩短、制造成本增高等问题,达到降低摩擦、提高填充密度、防止接触的效果
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Embodiment approach 1
[0024] In this embodiment, one method of producing a composite powder using an inorganic insulating material as the electrical insulating material covering the surface of the soft magnetic powder will be described.
[0025] The soft magnetic body used in this embodiment contains oxide-based materials such as ferrite, metal-based materials such as carbonyl iron, Fe-Si alloys, Ni-Fe alloys, and Fe-based or Co-based amorphous alloys. It is preferable to use a soft magnetic amorphous alloy which is superior in soft magnetic properties such as corrosion resistance, wear resistance, strength, and high magnetic permeability or low coercive force compared to crystalline materials. The soft magnetic amorphous alloy is not particularly limited, and known amorphous alloys such as iron-based or cobalt-based alloys can be used.
[0026] In addition, in the inorganic insulating material used in this embodiment, for example, Al can be used 2 o 3 , SiO 2 , Y 2 o 3 , MgO, and ZrO 2 etc.,...
Embodiment approach 2
[0041] This embodiment relates to another manufacturing method of the soft magnetic composite powder. In this embodiment, the soft magnetic powder described in Embodiment 1, the inorganic insulating material, and the resin material are heated to a temperature equal to or higher than the melting point of the resin material and mixed to produce a composite powder. Preferably, glass powder is used as the inorganic insulating material, and resin powder is used as the resin material. The surface of the soft magnetic powder is covered with the resin powder fused to the soft magnetic powder and the glass powder bonded by the resin powder, thereby obtaining a composite powder in which the resin powder is fused to the surface of the glass powder.
[0042] Here, the particle size of the glass powder and the resin powder is smaller than that of the soft magnetic powder, preferably half or less, for example, when the particle size of the soft magnetic powder is 300 μm or less, 150 μm or l...
Embodiment approach 3
[0045] This embodiment relates to a method of manufacturing a soft magnetic molded body. In this embodiment, a soft magnetic fired body is produced by using the composite powder of Embodiments 1 and 2 as a raw material powder by so-called metal injection molding (MIM). MIM is a method of degreasing and firing the above-mentioned injection molded body to produce a fired body. Conventionally, in MIM, the strength of the molded body after the degreasing process is very low, and it cannot be used as a soft magnetic material in this state. In addition, when the molded body is sintered, the insulating properties are lowered, making it difficult to obtain a material with high magnetic properties. However, by using the composite powder of the present invention as a raw material powder, it is possible to obtain the same magnetic properties as in the above-mentioned powder compacting-firing method. Here, in the composite powder for MIM, it is preferable that the thermal decomposition ...
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