Preparation and sintering of single-aperture blank of oxygen self-supported permanent magnetic ferrite pre-sintering material

A technology of permanent magnet ferrite and pre-sintered material, which is applied in the field of magnetic functional material preparation, can solve the problems of reduced output of ferrite pre-sintered material, unfavorable energy saving and environmental protection, and impact on product performance, so as to avoid the difficulty of forming magnetic parts, Cost-effective, the effect of improving efficiency

Inactive Publication Date: 2014-08-06
宿州学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the surface area of ​​the ferrite in the billet in contact with oxygen can be maintained to a certain extent, and the performance uniformity of the material after sintering can be improved; however, in the actual production process, due to the temperature and The air density is different, and some areas of the final pre-fired material are not completely sintered, which affects the performance of the same batch of products
If the pore size of the blank is increased, although the oxygen supply of the blank during the sintering process can be increased, the output of the ferrite pre-sintered material produced by single batch sintering is greatly reduced, which is not conducive to energy saving, environmental protection, and efficient use of energy.
[0005] At present, single-aperture billets are used to prepare permanent magnet ferrite pre-sintered materials, and the product performance of the first-time pre-sintered materials only reaches remanence B. r The value reaches ≥200mT, the intrinsic coercive force H cj The value reaches ≥125kA / m, the magnetic energy product (BH) max Value reaches ≥18.7kJ / m 3 ; thus affecting the performance of the magnetic material after the secondary addition of the calcined material

Method used

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  • Preparation and sintering of single-aperture blank of oxygen self-supported permanent magnetic ferrite pre-sintering material
  • Preparation and sintering of single-aperture blank of oxygen self-supported permanent magnetic ferrite pre-sintering material
  • Preparation and sintering of single-aperture blank of oxygen self-supported permanent magnetic ferrite pre-sintering material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the chemical structure formula Sr 1-x Ba x O nFe (12-y) / n R y / n o 3(x=0.0, n=6.0, y=0.2, R is the composition requirement of Mn, with industrially produced iron red (purity is 99.5%), strontium carbonate (purity is 99.05%) and industrial pure K 2 MnO 4 As raw material, batching is carried out once, and 0.2wt% CaCO is added at the same time 3 , 0.3wt% SiO 2 As a primary additive, mix with water and steel balls according to the weight ratio of material: water: ball = 1: 1.5: 15, and perform primary ball milling for 2 hours to obtain a mixture with an average particle size of suspended particles of 1.0-1.5 μm.

[0027] After the mixed material is filtered, dried and granulated, it is pre-fired at 1290°C and kept for 3 hours to prepare the M-type permanent magnet ferrite pre-fired material;

[0028] Then, in the calcined powder obtained after pulverizing and sieving, add secondary additives, the addition of each component of the additive and the calcined...

Embodiment 2

[0033] According to the chemical structure formula Sr 1-x Ba x O nFe (12-y) / n R y / n o 3 (x=0.0, n=6.0, y=0.25, R is the composition requirement of Mn, with industrially produced iron red (purity is 99.5%), strontium carbonate (purity is 99.05%) and industrial pure K 2 MnO 4 As raw material, batching is carried out once, and 0.2wt% CaCO is added at the same time 3 , 0.3wt% SiO 2 As a primary additive, mix with water and steel balls according to the weight ratio of material: water: ball = 1: 1.5: 15, and perform primary ball milling for 2 hours to obtain a mixture with an average particle size of suspended particles of 1.0-1.5 μm.

[0034] After the mixed material is filtered, dried and granulated, it is pre-fired at 1290° C. and kept for 3 hours to prepare the M-type permanent magnet ferrite pre-fired material.

[0035] Then, in the calcined powder obtained after pulverizing and sieving, add secondary additives, the addition of each component of the additive and the calc...

Embodiment 3

[0040] According to the chemical structure formula Sr 1-x Ba x O nFe (12-y) / n R y / n o 3 (x=0.0, n=6.0, y=0.3, R is the composition requirement of Mn, with industrially produced iron red (purity is 99.5%), strontium carbonate (purity is 99.05%), technical pure K 2 MnO 4 As raw material, batching is carried out once, and 0.2wt% CaCO is added at the same time 3 , 0.3wt% SiO 2 As a primary additive, mix with water and steel balls according to the weight ratio of material: water: ball = 1: 1.5: 15, and perform primary ball milling for 2 hours to obtain a mixture with an average particle size of suspended particles of 1.0-1.5 μm.

[0041] After the mixed material is filtered, dried and granulated, it is pre-fired at 1290°C and kept for 3 hours to prepare an M-type permanent magnet ferrite pre-fired sample block;

[0042] Then, in the calcined powder obtained after pulverizing and sieving, add secondary additives, the addition of each component of the additive and the calcined...

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Abstract

The invention relates to preparation and sintering of a single-aperture blank of an oxygen self-supported permanent magnetic ferrite pre-sintering material and belongs to the technical field of preparation of magnetic functional materials. The technical scheme is carried out according to a main-phase molecular formula: Srl-xBaxO.nFe (12-y)/nRy/nO3, wherein x is not less than 0 and is not greater than 0.998, and n is not less than 5.75 and not greater than 6.15, 0 & 1t; y is not greater than 0.6, and R is Mn and is secondarily added with one or more than two of industrial pure oxides CeO2, GeO2 and MnO2. To the prepared pre-sintering material and a high-performance permanent magnetic ferrite material prepared from auxiliary secondary adding, the residual magnetism Br value is at least 392 mT, the Hcj value is at least 343.1 kA/m, and the BHmax value is at least 27.9 kJ/m<3>. The preparation and sintering have the advantages that a certain amount of K2MnO4 is added to a raw material of the ferrite pre-sintering material prepared by one-time sintering and meanwhile MnO2 is added into a secondary adding auxiliary material, so that the uniformity of performance of the same batch of products is improved, and the grain refinement is facilitated at the same time; the problem of the restriction of residual magnetic flux density Br and Hcj is effectively solved, and the prepared permanent magnetic ferrite has high Br and Hcj.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional material preparation, and in particular relates to a preparation and sintering process of a self-oxygen-supply type permanent magnet ferrite pre-sintered single-aperture billet. Background technique [0002] M-type permanent magnet ferrite belongs to the hexagonal crystal system. It is used as an important permanent magnet because of its high uniaxial magnetic crystal anisotropy, superior cost performance, high Curie temperature and chemical stability. Materials and magnetic recording materials are widely used in various fields such as home appliances, computers, automobiles, and communications. [0003] In recent years, with the continuous improvement of product miniaturization, light weight, thin profile and environmental protection and energy saving requirements, the demand for permanent ferrite materials has greatly increased. Therefore, it is of great significance to explore and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 牛晓飞郝保明纵榜峰
Owner 宿州学院
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