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

A technology of manganese-zinc ferrite and sintering method, applied in the field of magnetic materials, can solve problems such as disadvantages, reduce the cost of manganese-zinc ferrite materials and preparation costs, achieve increased concentration, avoid discontinuous grain growth, save energy The effect of nitrogen dosage

Active Publication Date: 2021-01-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the currently published patents on manganese zinc ferrite sintering process, such as patents CN101274846A, CN102020462A and CN103524124A, all use corresponding oxides as raw materials, and do not use manganese zinc ferrite secondary materials as raw materials, and the traditional sintering Oxygen partial pressure control is generally carried out by flowing nitrogen gas, which will not help reduce the material cost and preparation cost of manganese zinc ferrite

Method used

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

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Effect test

Embodiment 1

[0025] Using manganese zinc ferrite secondary material powder as raw material, the samples were prepared according to the technological process of ball milling→drying→granulation→forming→sintering, and the sintering was carried out in a high-temperature atmosphere tube furnace. The sample is heated in the air during the heating process from room temperature to 900°C. When the temperature rises to 900°C, the sintering oxygen partial pressure is controlled by vacuum pumping and feeding high-purity nitrogen (the vacuum degree required for sintering oxygen partial pressure is based on the required sintering oxygen partial pressure using the gas partial pressure. law Calculated, where x 1 is the sintering oxygen partial pressure described in the present invention, P 1 is the partial pressure of oxygen in the mixed gas, P 总 is the total pressure of the mixed gas), first use the vacuum pump to evacuate to a certain degree of vacuum, and then introduce high-purity nitrogen until t...

Embodiment 2

[0027] Using manganese zinc ferrite secondary material powder as raw material, the samples were prepared according to the technological process of ball milling→drying→granulation→forming→sintering, and the sintering was carried out in a high-temperature atmosphere tube furnace. The sample is heated in the air during the heating process from room temperature to 900°C. When the temperature rises to 900°C, start to control the sintering oxygen partial pressure by vacuuming the vacuum pump and feeding high-purity nitrogen gas. First, use the vacuum pump to pump to a certain degree of vacuum, and then feed high-purity nitrogen gas to the gas pressure of the sintering chamber. After the pressure is 0.1MPa (the outlet pressure of the gas pressure reducing valve is 0.015MPa when high-purity nitrogen is introduced), stop the introduction of high-purity nitrogen to reduce the partial pressure of oxygen to 4%, heat up to 1325°C for 3 hours, and at the same time, the oxygen The partial pr...

Embodiment 3

[0029] Using manganese zinc ferrite secondary material powder as raw material, the samples were prepared according to the technological process of ball milling→drying→granulation→forming→sintering, and the sintering was carried out in a high-temperature atmosphere tube furnace. The sample is heated in the air during the heating process from room temperature to 900°C. When the temperature rises to 900°C, start to control the sintering oxygen partial pressure by vacuuming the vacuum pump and feeding high-purity nitrogen gas. First, use the vacuum pump to pump to a certain degree of vacuum, and then feed high-purity nitrogen gas to the gas pressure of the sintering chamber. After the pressure is 0.1MPa (the outlet pressure of the gas pressure reducing valve is 0.015MPa when high-purity nitrogen is introduced), stop the introduction of high-purity nitrogen to reduce the partial pressure of oxygen to 3%, raise the temperature to 1325 ° C for 3 hours, and at the same time, the oxygen...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/64
CPCC04B35/2658C04B35/64C04B2235/656C04B2235/6567C04B2235/6583C04B2235/6584
Inventor 刘仲武邓沃湛钟喜春余红雅
Owner SOUTH CHINA UNIV OF TECH
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