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Dispersant and method for improving magnetic property of permanent magnetic ferrite

A permanent magnet ferrite and magnetic performance technology, which is applied in the field of dispersant to improve the magnetic performance of permanent magnet ferrite, can solve problems such as difficult discharge, magnet cracking, and reduced efficiency and pass rate in the molding stage, so as to improve the use effect and increase Magnetic properties, the effect of excellent magnetic properties

Active Publication Date: 2015-03-25
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the best dispersant is calcium gluconate, but due to the strong water retention of calcium gluconate, it is not easy to be discharged during the molding stage, thereby reducing the efficiency and pass rate of the molding stage, and at the same time, due to the presence of calcium gluconate in the green body. There are many residues, these residual calcium gluconate will decompose during the sintering process and lead to cracking of the magnet

Method used

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  • Dispersant and method for improving magnetic property of permanent magnetic ferrite
  • Dispersant and method for improving magnetic property of permanent magnetic ferrite

Examples

Experimental program
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Embodiment 1

[0023] The dispersant in this example includes 4 experiments: wherein the mass ratios of calcium gluconate and calcium lactate are 5:1, 5:1, 4:1, and 10:1 in sequence.

[0024] The method for improving the magnetic performance of permanent ferrite comprises the following steps:

[0025] (1) Add 1kg of permanent magnet ferrite calcined material, 10g of calcium carbonate, 2.5g of quartz sand and 3g of alumina into the ball mill, then add 1.4kg of water, and then add dispersants (calcium gluconate and calcium lactate, please add See Table 1), start the ball mill until the particle size is 0.80 μm, and obtain the permanent magnet ferrite slurry; (2) precipitate and filter the permanent magnet ferrite slurry obtained in step (1) until the water content is 32wt%, and obtain the permanent magnet ferrite Filter the slurry; (3) inject the permanent magnet ferrite filter slurry obtained in step (2) into the mold, and pressurize at 380kg / cm under the condition of a magnetic field strengt...

Embodiment 2

[0031] The mass ratio of the dispersant calcium gluconate and calcium lactate in this embodiment is 4:1.

[0032] The method for improving the magnetic performance of permanent ferrite comprises the following steps:

[0033] (1) Put 1kg of permanent magnet ferrite calcined material, calcium carbonate, quartz sand and alumina (see Table 2 for the amount added) into the ball mill, then add water (see Table 2 for the amount added), and then add the dispersant ( 4g calcium gluconate and 1g calcium lactate), start ball milling (see Table 2 for ball mill size), to obtain permanent ferrite slurry; (2) precipitate and filter the permanent ferrite slurry obtained in step (1) until the water content is 36wt%, to obtain the permanent magnet ferrite filter slurry; (3) inject the permanent magnet ferrite filter slurry obtained in step (2) into the mold, and pressurize 420kg / cm under the condition that the magnetic field strength is 780kA / m 2 Forming to obtain a permanent magnet ferrite gr...

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Abstract

The invention relates to a dispersant and a method for improving the magnetic property of a permanent magnetic ferrite. The dispersant comprises calcium gluconate and calcium lactate at a mass ratio of (3-10):1. The method comprises the following steps: (1) adding a pre-sintering material of the permanent magnetic ferrite as well as calcium carbonate, quartz sand and alumina into a ball mill; adding water and the dispersant and carrying out ball milling to obtain permanent magnetic ferrite slurry; (2) filtering and precipitating the permanent magnetic ferrite slurry to obtain the filtered permanent magnetic ferrite slurry; (3) injecting the filtered permanent magnetic ferrite slurry into a die, carrying out pressure molding on the filtered permanent magnetic ferrite slurry under the condition of an appropriate magnetic field intensity to obtain a permanent magnetic ferrite green body; and (4) sintering the permanent magnetic ferrite green body to obtain the permanent magnetic ferrite. By adopting composite added calcium gluconate and calcium lactate as the dispersant, by the method, the application effect of calcium gluconate can be obviously improved and the magnetic property of the permanent magnetic ferrite is increased compared to the single addition of calcium gluconate.

Description

technical field [0001] The invention relates to a dispersant and a method for improving the magnetic performance of permanent ferrite. Background technique [0002] Permanent ferrite is a non-metallic magnetic material, which can generate a stable magnetic field only by providing magnetization energy once from the outside, so as to continuously provide magnetic energy to the outside. Permanent magnet ferrite is mainly used in various motor equipment and speakers, etc. At present, the widely used permanent magnet ferrite materials use iron oxide and strontium carbonate as raw materials, and high-performance permanent magnet ferrite materials also need to add cobalt oxide And rare earth oxides to improve magnetic properties. [0003] The magnetic performance indicators of permanent ferrite mainly include remanence (Br) and intrinsic coercive force (Hcj). The higher the two indicators, the better the performance of the magnet, and the remanence is proportional to the density a...

Claims

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Application Information

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IPC IPC(8): C04B35/632C04B35/26C04B35/622
Inventor 郑亮汪德良张铁军胡盛青
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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