Preparation method for permanent magnet ferrite

A technology of permanent magnet ferrite and silicon oxide, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as high temperature and performance deviation of permanent magnet ferrite, and achieve improved magnetic performance and easy predictability. The effect of burning and reducing the defective rate

Inactive Publication Date: 2018-02-09
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to human or equipment reasons in the mass production process, the temperature in the highest temperature range set by the sintering furnace body will be higher or lower, resulting in deviations in the performance of the sintered permanent magnet ferrite

Method used

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  • Preparation method for permanent magnet ferrite

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Effect test

Embodiment 1

[0022] The present embodiment provides a kind of preparation method of permanent magnet ferrite, specifically following steps:

[0023] (1) Ingredients weighing and wet grinding

[0024] This preparation method batching total amount is by 1500kg batching, by molecular formula Sr 1-x La x Fe 2n-y-z co y Zn z o 19 Weigh the main phase raw materials of permanent magnet ferrite according to the molar ratio: x is 0.4, y is 0.1, z is 0.1, n is 5.4, x / (y+z) is 2, and thus the strontium carbonate powder ( Purity ≥ 98wt%, original average particle size of particles 2.0um) 121.7kg, lanthanum oxide powder (purity ≥ 99.9wt%, original average particle size 1.5um) 179.1kg, zinc oxide powder (purity ≥ 98.0wt%, original particle size Average particle size 2.0um) 11.2kg, cobalt oxide powder (purity ≥ 99wt%, the original average particle size of particles 2.0um) 22.5kg; Add a primary additive to the main phase raw material powder, the primary additive is silicon oxide and boric acid, The...

Embodiment 2

[0038] The present embodiment provides a kind of preparation method of permanent magnet ferrite, specifically following steps:

[0039] (1) Ingredients processing

[0040] This preparation method batching total amount is by 1500kg batching, by molecular formula Sr 1-x La x Fe 2n-y-z co y Zn z o 19 Weigh the main phase raw materials of permanent magnet ferrite according to the molar ratio: x is 0.5, y is 0.15, z is 0.1, n is 5.4, x / (y+z) is 2, and thus the strontium carbonate powder ( Purity≥98wt%, the original average particle size of particles is 2.0um) 99.4kg, lanthanum oxide powder (purity≥99.9wt%, original average particle size of particles is 1.5um) 219.5kg, zinc oxide powder (purity≥98.0wt%, original particle size Average particle size 2.0um) 11kg, cobalt oxide powder (purity ≥ 99wt%, the original average particle size of particles 2.0um) 33.1kg; Add a primary additive to the main phase raw material powder, the primary additive is silicon oxide and boric acid, add ...

Embodiment 3

[0054] The present embodiment provides a kind of preparation method of permanent magnet ferrite, specifically following steps:

[0055] (1) Ingredients processing

[0056] This preparation method batching total amount is by 1500kg batching, by molecular formula Sr 1-x La x Fe 2n-y-z co y Zn z o 19 Weigh the main phase raw materials of permanent magnet ferrite according to the molar ratio: x is 0.6, y is 0.2, z is 0.1, n is 5.4, x / (y+z) is 2, and thus the strontium carbonate powder ( Purity ≥ 98wt%, the original average particle size of particles is 2.0um) 78kg, lanthanum oxide powder (purity ≥ 99.9wt%, original average particle size 1.5um) 258.2kg, zinc oxide powder (purity ≥ 98.0wt%, original average particle size Particle size 2.0um) 10.8kg, cobalt oxide powder (purity ≥ 99wt%, original average particle size of particles 2.0um) 43.3kg; Add a primary additive to the main phase raw material powder, the primary additive is silicon oxide and boric acid, add Ratio For ever...

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Abstract

The invention relates to a preparation method for permanent magnet ferrite. The preparation method comprises the following steps of adding additives like silica and boracic acid once while weighing raw materials and wet grinding the raw materials, and adjusting the pressure of combustion air and the pressure of induced air in pre-burning so as to enable a high-temperature section of a pre-burningarea to reach 3m in length to perform pre-burning; and adding additives once, so as to enable raw materials to be burned in advance more easily. The high-temperature area reaches 3m long by adjustinga combustion fan and a draught fan, so that the thermal insulating time is prolonged at the same pre-burning temperature. The pre-burning material prepared by combining the methods can be adapted to wider sintering temperature in secondary sintering, so that unqualified permanent magnet ferrites caused by temperature change in sintering processes are reduced.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a preparation method of permanent ferrite. Background technique [0002] Permanent magnet ferrite is a general term for compounds composed of divalent cation metal oxides and trivalent iron. Industry plays an important role. [0003] In the process of preparing permanent ferrite, the secondary firing of permanent ferrite after molding is a crucial link, which directly affects the performance and stability of permanent ferrite. During the firing process, we set The highest sintering temperature can be called the sintering temperature of this ferrite. When the sintering temperature of permanent magnet ferrite is too low, the product density will be low, the shrinkage will be small, the internal molecular distance will increase, and the ferrite density will be low. There will be water absorption. When the sintering temperature of permanent magnet ferrite is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622C04B35/63C04B35/632C04B35/64H01F41/02
CPCC04B35/2633C04B35/2641C04B35/622C04B35/6303C04B35/632C04B35/64C04B2235/3213C04B2235/3227C04B2235/3272C04B2235/3275C04B2235/3284H01F41/0253H01F41/0266
Inventor 潘朝
Owner ANHUI SINOMAG TECH
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