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Basic introduction of ferrite production process

Release Time:2019-09-03

Source: Shanghai Fuyu Magnetic Industry Co., Ltd.

Views:12

  • 询价

  According to the ferrite crystal structure and morphology, the preparation process is roughly divided into: polycrystalline ferrite production process; ferrite chemical process; single crystal ferrite manufacturing process and other special processes, such as ferrite polycrystalline film and non- Crystal ferrite and the like.

  Polycrystalline ferrite production process

  Similar to the sintering process commonly used in the ceramic industry, the following steps are included: a metal oxide or a carbonate or other compound which forms a ferrite by a solid phase reaction, and after being uniformly mixed, it is ball-milled, dried, and pressed into a specific shape. After calcination at a temperature of about 1000 ° C, it is thoroughly ground and mixed again. An appropriate amount of binder is added, pressed into a desired shape or extruded into a tubular shape, a rod shape or a strip shape as a plastic material. It is then sintered at a temperature of 1200 to 1400 ° C, and the exact temperature depends on the desired ferrite characteristics. In the final sintering process, the environmental conditions in the furnace play an important role.

  Ferrite chemical process

  Also known as wet process, sometimes referred to as chemical coprecipitation. Processes for the preparation of higher performance ferrites can be divided into neutralization and oxidation processes. The process is as follows: firstly, the metal element required for preparing ferrite is formulated into a certain concentration of ionic solution, and then mixed according to the formula, and a ferrite powder is formed by chemical reaction such as neutralization or oxidation, and thereafter The process is the same as described above.

  Single crystal ferrite manufacturing process

  It is roughly the same as non-metallic single crystal growth. The growth of Mn-Zn and Ni-Zn ferrite single crystals is generally carried out by the Brizmann method, in which the polycrystalline ferrite is melted in a platinum crucible and then reduced in a suitable temperature gradient electric furnace. The bottom of the crucible slowly solidifies to form a single crystal. In order to balance the partial pressure of oxygen formed in the molten state, it is necessary to add an oxygen partial pressure of several or even 100 MPa in the furnace during crystal growth.

  Preparation of ferrite polycrystalline film

  For example, a vertically magnetized barium ferrite film is sputtered using a novel counter target sputtering apparatus. The garnet single crystal film is prepared by gas phase or liquid phase epitaxy on a single crystal substrate, and the specific process is very similar to the epitaxial method of the semiconductor single crystal film.

  Preparation of amorphous ferrite

  At present, an ultra-quenching method and a sputtering method are employed. The so-called ultra-quenching method is a method in which a ferrite material and an appropriate amount of a metal element are mixed, and a large temperature gradient is rapidly cooled in a high-temperature molten state. The research work in this area has just begun, and the performance of the products is still not satisfactory.

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