Method for sintering manganese zinc ferrite magnetic material in combination of microwave and electric heating

Abstract

The invention discloses a method for sintering a manganese zinc ferrite magnetic material in combination of microwave and electric heating. The sintering method comprises the following steps: firstly, raising the temperature from room temperature to 180-210 DEG C by adopting a microwave heating mode, keeping the temperature, heating to 380-410 DEG C by adopting the microwave heating mode, then keeping the temperature, heating to 780-810 DEG C by adopting a traditional silicon carbide rod heating mode, heating to 1180-1210 DEG C by adopting a traditional silicon molybdenum rod heating mode, then raising the temperature to 1330-1380 DEG C by adopting the microwave heating mode, keeping the temperature, cooling to below 150 DEG C, and then discharging. The method has the advantages that the heating time is greatly shortened, the aim of saving energy and reducing consumption is achieved, and the high pass percent of the product is effectively guaranteed; the method is suitable for sintering of the manganese zinc ferrite magnetic material.

Description

technical field [0001] The present invention relates to the technical field of sintering methods, more specifically to the technical field of sintering manganese zinc ferrite magnetic materials. Background technique [0002] At present, the production process of manganese zinc ferrite magnetic materials mainly includes batching, pressing, sintering and dimension processing, among which the sintering process is an important part of the whole process. There are two main sintering methods generally used now: one is The ladle furnace is used for sintering by traditional silicon carbide rod or silicon molybdenum rod intermittent heating method, and the other is to use the tunnel pusher kiln for sintering by traditional silicon carbon rod or silicon molybdenum rod continuous heating method. The common disadvantages of the above two sintering methods are: first, they all use the traditional silicon carbon rod or silicon molybdenum rod heating method. The heat transfer direction of ...

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Problems solved by technology

The common disadvantages of the above two sintering methods are: first, they all use the traditional silicon carbon rod or silicon molybdenum rod heating method. The heat transfer direction of this heating method is from outside to inside, which has nothing to do with the heated material It is well used to heat the special magnetic material of manganese zinc ferrite. In addition, when the energy is transferred in this heating method, the surface of the heated material is heated first, which not only does not heat uniformly, but also leads to a large amount of energy loss. In the heating environment, that is, the heat treatment of the substance completely depends on the thermal effect; the second is that the temperature control curve of the existing heating method is very unreasonable, so that the substance cannot be well drained and degummed during the early heating process, resulting in cracking of the product and distortion are serious, and the substance cannot be well crystallized and formed during the mid-term heating and post-cooling process, which will also make it difficult to guarantee and improve the final pass rate of the product. In addition, the existing heating method has a long heating time, Higher energy consumption and higher production costs

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