Oxygen partial pressure controlled sintering method for preparing manganese zinc ferrite from secondary materials

Abstract

The invention belongs to the field of magnetic materials, and discloses an oxygen partial pressure control sintering method for preparing manganese zinc ferrite through a re-grinding material. The method comprises the following steps: heating a manganese zinc ferrite re-grinding material compacted blank obtained through pretreatment at room temperature to 900 DEG C; feeding nitrogen for replacement when the temperature is risen to 900 DEG C, adjusting the oxygen partial pressure to be 0.5 to 15 percent, stopping feeding the nitrogen, continuously rising the temperature to sintering temperatureto perform thermal insulation sintering, keeping the obtained oxygen partial pressure till a thermal insulation sintering stage is stopped, and sealing a sintering cavity at the thermal insulation sintering stage; finally performing cooling in a flowing nitrogen condition, so as to obtain a sintering product. The method has the advantages that nitrogen is not required to be continuously fed at asecond temperature rising stage and the thermal insulation sintering stage, the dosage of nitrogen required during sintering is greatly saved, the preparation cost is reduced, and the obtained soft magnetic property is obviously better than that of the manganese zinc ferrite prepared through a common sintering method through the control of the sintering oxygen partial pressure.

Description

technical field

[0001] The invention belongs to the field of magnetic materials, and in particular relates to an oxygen partial pressure controlled sintering method for preparing manganese-zinc ferrite from secondary materials. Background technique

[0002] With the continuous development of high-frequency radio technology, soft ferrite materials have gradually become one of the basic functional materials in the electronics industry. Among them, manganese-zinc ferrite materials are the most widely used and the largest output soft ferrite materials. The annual output exceeds 50% of the total annual output of soft ferrite materials. However, in the manufacturing process of MnZn ferrite, a large amount of secondary materials will be produced due to grinding, missing corners, substandard soft magnetic properties, etc., accounting for about 10-20% of the total weight. At present, manganese-zinc-ferrite secondary materials are mainly disposed of in the way of centralized stacking...

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