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A method for manufacturing flaky rare earth permanent magnet ferrite material

A technology of permanent ferrite and flaky crystals, which is applied in the fields of magnetism of inorganic materials, manufacturing of inductors/transformers/magnets, electrical components, etc., can solve problems affecting magnetic properties, reduction of local anisotropy field in ball milling, etc., and achieve molding flow Good performance, good for orientation and improved magnetic properties

Active Publication Date: 2021-01-26
浙江凯文磁钢有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

As the rolling ball milling time increases, stress and defects will inevitably occur, and in the defects of the grain material, it is easy to generate reverse magnetization nuclei with low critical field, and the dislocations generated by ball milling will easily cause the local anisotropy field to decrease
These places are more likely to produce anti-magnetized nuclei and affect magnetic properties

Method used

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  • A method for manufacturing flaky rare earth permanent magnet ferrite material
  • A method for manufacturing flaky rare earth permanent magnet ferrite material
  • A method for manufacturing flaky rare earth permanent magnet ferrite material

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Embodiment Construction

[0023] A method for manufacturing flaky rare earth permanent magnet ferrite material, comprising the following steps:

[0024] (1) Pre-burning: Preliminarily ball mill the permanent magnet ferrite billet in a ball mill. In the ball mill, according to the mass ratio, the permanent magnet ferrite billet: steel ball: water = 1:2:1.2; and then undergo microwave under oxygen-enriched conditions. Pre-firing, the microwave frequency is 500~800MHz, the microwave sintering temperature is 1000°C, and the microwave treatment time is 20~25min to generate permanent magnet ferrite pre-sintered material;

[0025] The permanent magnet ferrite blank is made of SrCO 3 , Fe 2 o 3 and Sm 2 o 3 Composition, according to relative molar ratio, SrCO 3 : Fe 2 o 3 : Sm 2 o 3 =9:56:1.

[0026] from figure 1 It can be seen that microwave sintering can significantly reduce the grain size of sintered body compared with conventional muffle furnace sintering. In the traditional sintered samples, ...

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Abstract

A method for manufacturing flaky rare earth permanent magnet ferrite materials, belonging to the technical field of magnetic material preparation methods, comprising the following steps: step (1) pre-calcination; step (2) coarse crushing; step (3) ball milling; step ( 4) Forming; Step (5) Sintering; Step (6) Grinding; Step (7) Inspection, packaging and storage. The permanent magnet ferrite material prepared by the invention has good forming fluidity, high degree of orientation, and greatly improved magnetic performance parameters.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of magnetic materials, and in particular relates to a method for manufacturing flaky rare earth permanent magnet ferrite materials. Background technique [0002] The output of permanent magnet ferrite materials in my country has reached more than half of the output involved. The magnetic performance index has been synchronized with the world-leading Japanese TDK company. In the future, it will continue to innovate technology, reduce consumption, improve efficiency, reduce cost and improve quality. [0003] Usually, after pre-sintering and coarse crushing, the permanent magnet ferrite should be crushed to about 1 μm by rolling ball mill or sand mill before forming. Anisotropic permanent magnets obtain magnetic field orientation during forming. The ball mill can pulverize and evenly mix the materials. As the rolling ball milling time increases, stress and defects will inevitably occur,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/626H01F1/10H01F41/02
Inventor 卢杨成赵国法
Owner 浙江凯文磁钢有限公司
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