Introduction of the key processes of each production process of magnetic materials(5)

- Nov 20, 2017 -

5. The production process of the key processes introduced

The front of the sintering process in turn introduced all the processes, as most of the other production processes and sintering process is the same, in order to avoid duplication, then the other key processes of special processes are introduced.

(2) Casting process description of key processes

① pouring

Pouring, also known as directional solidification, is the melting of the molten alloy obtained by melting into the abrasive, for casting alloy parts. The mold used for casting is more widely used as a sand mold, resulting in a relatively large piece of AlNiCo magnet, which is then cut to the desired magnet size. The picture below shows the pouring process.

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(3) bonding process key processes introduced

① curing treatment

The bonding process, the basic role of the adhesive is to increase the mobility of magnetic particles and the bonding strength between them. A wide range of adhesives, the principle of choice of adhesive is: bonding strength, high bond strength, low water absorption, dimensional stability, size shrinkage and other small curing. Adhesives are thermosetting adhesives and thermoplastic adhesives. Depending on the choice of adhesive, it is decided whether to perform the curing process in the bonding process. If a thermosetting resin is selected as the adhesive, a curing process is required. If a thermoplastic resin is selected as the adhesive, no curing process is required. The curing process requires heating to 100-150 ° C, at which point the thermosetting adhesive sends a chemical reaction that crosslinks and solidifies to harden, after which the form will not transmit any more.

(4) hot pressing deformation of the key processes introduced

Thermal deformation

The thermal deformation process is to press the isotropic magnet obtained by hot pressing at a higher temperature to deform the magnet so as to orient the crystal grains therein so that the c-axes of the crystal grains are arranged in the pressure-parallel direction. After hot pressing deformation, the magnetic properties of the magnet parallel to the pressure direction significantly increased, while the magnetic properties of the vertical pressure direction was significantly reduced. That is to say the magnet has been transformed from an isotropic sample into an anisotropic sample after hot pressing deformation. The picture below shows the hot stamping press.

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Article from NdFeB Industry Network

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