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High-coercivity permanent magnetic ferrite and preparation method thereof

A permanent magnet ferrite, high coercivity technology, applied in the field of magnetic material preparation, can solve the problems of increased input cost, complex preparation process and high price cost, and achieves increased contact area, uniform grain distribution, and improved coercivity. force effect

Inactive Publication Date: 2016-04-13
SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: first, adding additive R in the secondary ball milling x al y Fe z o m , R x al y Fe z o m The preparation process is complex, time-consuming and labor-intensive; second, the added additives contain rare earth elements such as cobalt and praseodymium, and the price and cost of rare earth elements are high, resulting in a great increase in input costs

Method used

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  • High-coercivity permanent magnetic ferrite and preparation method thereof
  • High-coercivity permanent magnetic ferrite and preparation method thereof
  • High-coercivity permanent magnetic ferrite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a1

[0031] In this embodiment, at first the raw materials are processed, and the specific processing method is as follows:

[0032] 1) Ball milling: the raw material 500gCaCO 3 , 2.5g calcium gluconate and 3.0g sorbitol are put into sand mill, and water is medium, material: ball: water=1:20:1.5, rotating speed 400r / min, stir 8 hours;

[0033] 2) Sintering: Use a program-controlled box-type electric furnace to pre-sinter the material obtained in step 1), and the sintering temperature is raised from 100°C to 500°C. The specific sintering process is as follows: 100°C / 1.0h+180°C / 1.0h +380°C / 1.0h+450°C / 1.0h+500°C / 2h, the above time is holding time;

[0034] 3) Milling: Grinding the material obtained in step 2) to prepare powder for future use.

[0035] Using the same raw materials and the same process as Comparative Example A1, the only difference is that the CaCO obtained by the above-mentioned treatment is added 3 , relative to the calcined material, the weight percentage of the a...

Embodiment a2

[0039] Using the same raw materials and the same process as Comparative Example A2, the only difference is that the 4.5gSrCO obtained by adding the above treatment 3 , the magnetic performance test of the prepared product was carried out with a magnetic material automatic measuring device, and the specific performance parameters are shown in Table 2.

Embodiment a3

[0043] Using the same raw materials and the same process as Comparative Example A3, the only difference is that the 3.0g CaCO obtained by adding the above treatment 3 and 1.5gSrCO 3 , the magnetic performance test of the prepared product was carried out with a magnetic material automatic measuring device, and the specific performance parameters are shown in Table 2.

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Abstract

The invention discloses a high-coercivity permanent magnetic ferrite and a preparation method thereof. According to the method, one or a mixture of two or more selected from the group consisting of treated raw materials, i.e., CaCO3, SrCO3 and Fe2O3 are added on the basis of the mass of strontium ferrite pre-sintered material in the procedure of batching, and CaCO3 or SrCO3 is definitely used. The method employs raw materials used in conventional processes and treats the raw materials including CaCO3, SrCO3 and Fe2O3; since one powder selected from or mixed powder of the treated CaCO3, SrCO3 and Fe2O3 is added in the procedure of batching and the powder has substantially increased surface areas and good dispersibility, a contact area is increased and great interfacial energy is produced among pre-sintered ferrite particles after the powder is mixed with the pre-sintered ferrite particles, so growth of ferrite crystal grains is inhibited, the single domain structure of a magnet is maintained, and distribution of crystal grains in the magnet is uniform; and thus, the coercive force of the magnet is improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a high-coercivity permanent magnet ferrite and a preparation method thereof. Background technique [0002] With the rapid development of automobile industry, electric bicycle, office automation equipment, home appliance industry, electric tool and toy industry and other fields, the world's demand for permanent ferrite materials is increasing year by year. Today's automotive motors and frequency conversion motors are developing in the direction of energy saving, light weight, small size, and high efficiency. It is necessary for permanent magnet ferrite to not demagnetize under low or high temperature conditions and to ensure product reliability. High correction is required. Strong permanent magnet ferrite material. In actual production now, the preparation method of high coercivity permanent magnet ferrite is mainly to add additives such as Al in...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/626C04B35/622
CPCC04B35/2683C04B35/622C04B35/6261C04B35/62675C04B2235/3208C04B2235/3213C04B2235/3272C04B2235/656C04B2235/96
Inventor 赵修彬邱伟国马宝李劲松舒云峰蔡家海张伟高原尹春龙
Owner SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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