Method for producing permanent magnets

Details Method for producing permanent magnets Method for producing permanent magnets

H - Electricity

01

F

148/5

H01F 1/26 (2006.01) H01F 41/02 (2006.01)

Patent

CA 1075567

4102 METHOD FOR THE MANUFACTURE OF PERMANENT MAGNETS ABSTRACT OF THE DISCLOSURE A method of making permanent magnets from magnetic powders employs the steps of comminuting the magnetic material to a powder and mixing the powder with a suitable binder. The resultant mixture is placed in a mold where predetermined pressure and vibration are simultaneously applied under the influence of a magnetic field. Metals, thermoplastic or thermosetting materials may be used as binders. When using any of these materials, the binder should have a solidification or setting temperature which appropriately differs from the mold temperature. When a binder composed of a material which softens with increase in temperature above a predetermined temperature is used, the mold is held at a temperature below said predetermine temperature. When a binder composed of a material which hardens with increase in temperature above a predetermined temperature is used, the mold is held above the predetermined hardening temperature. A preferred form of vibratory source is an ultrasonic resonator device. -1-

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