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We consider the manufacture of ferrites to be a science involving the complex technologies of chemical molecular composition and crystallography. Commercially used ferrites suitable for application in inductors, transformers, tuned circuits, etc. fall into two classes; manganese-zinc ferrites and nickel-zinc ferrites. Both are ceramic materials made of metal oxides.

Pure metallic oxides and organic binders are precisely measured, mixed and batched.

The mixture is Pelletized.

The mix of oxides are pre-fired at a temperatures on the order of 1000°C in a process known as Calcining. The ferrite structure, during this process, is partially formed at this stage, however the reaction is not complete.

The resultant formulation is intimately mixed with the addition of organic binders and its particles are reduced to submicron size during wet-milling creating a slurry.

The slurry is sampled dried, and tested for the desired chemical and electrical properties and can be adjusted to meet specific requirements and receive batch qualification.

The slurry is dried by continuous extraction of moisture by spray drying or by batch drying in a drying oven creating a powder suitable for automatic presses or into a form to facilitate extrusion or injection molding.

The powder is then molded to a desired shape or configuration by compacting in specialized powder metallurgy presses under high pressure. Pressing or extrusion results in shapes similar to those finally required but dimensions at this stage are significantly larger.

The compacted configuration is then heated to a high temperature on the order 1200 °C-1350°C (often in a controlled atmosphere) causing densification and substantial shrinkage of all dimensions. This process completes the desired chemical reaction creating a specific chemical substance (the ferrite) having a definite crystal structure and unique magnetic characteristics.

Any required finishing is completed and the parts are ready for all the various electrical applications.

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MMG-North America
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Tel: (973) 345-8900   •   Fax: (973) 345-1172
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