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Hard calcium ferrite and manufacturing method thereof

A technology of permanent ferrite and soft ferrite, applied in the field of permanent ferrite

Active Publication Date: 2012-01-25
自贡市江阳磁材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Experiments by Rams et al. showed that B 3+ Can replace Fe on the octahedral crystal sites in the spinel block in the magnetoplumbite structure 3+ , so that the magnetic moments on the two sublattices become larger, and the saturation magnetic induction and remanence increase. However, the known production process of traditional permanent magnet ferrite is to add a mass fraction of 0.1% to 0.5% in the fine grinding stage. %H 3 BO 3 or B 2 o 3 , under the conventional fine pulverization process conditions with the mass fraction ratio of material:ball:water being 1:4:1.5, the added H 3 BO 3 or B 2 o 3 Dissolve all the H in water, slurry filter water, forming drainage and other production processes, the H dissolved in water 3 BO 3 Will be lost with water, only a very small amount of B 3+ actually go into the product

Method used

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  • Hard calcium ferrite and manufacturing method thereof
  • Hard calcium ferrite and manufacturing method thereof
  • Hard calcium ferrite and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The preparation process of material A and material B is carried out as follows: (1) batching and mixing, according to the composition formula M x B y Si z o (x+2z+3y / 2) with W n Fe m o (n+3m / 2) , M is Sr, and x=1, y=2, z=0.67; W is Co, m=2, n=0.95, m:n=2.1, calculate the compound SrCO containing each metal element 3 , H 3 BO 3 , SiO 2 ,Co 3 o 4 , Fe 2 o 3The addition ratio of each component is accurately weighed, and the wet method is used to mix them evenly; (2)M x B y Si z o (x+2z+3y / 2) heat treatment, the M x B y Si z o (x+2z+3y / 2) In the air, carry out heat treatment at 810 ℃ for 2 hours; (3) W n Fe m o (n+3m / 2) pre-burning treatment. Will W n Fe m o (n+3m / 2) Pre-calcined in air at 850°C for 3 hours to obtain soft magnetic ferrite pre-sintered material; (4) Crushed, finely pulverized to powders with an average particle size of 1.0 μm, ready for use.

[0081] According to the composition formula Ca δ A σ R τ Fe 12 o 19 , A is Sr, R is ...

Embodiment 2

[0083] According to the composition formula Ca δ A σ R τ Fe 12 o 19 , A is Sr, R is La, and δ=0.218, σ=0.430, τ=0.432, σ+δ+τ=1.08, calculate the compound SrCO containing each metal element 3 , CaCO 3 , La 2 o 3 , Fe 2 o 3 The addition ratio of each component is accurately weighed, and after mixing them uniformly by wet method, in O 2 Under the condition that the volume fraction of the calcium permanent magnet ferrite is greater than 9%, the pre-calcination is carried out at 1300 ° C for 1 hour, and then the blocky reactant is broken into 2 μm calcium permanent magnet ferrite pre-sintered powder with a vibrating crusher. Add CaSiO with a mass fraction of 0.9% 3 , is 0.8% sorbitol, meanwhile, add A material and B material prepared by embodiment 1, wherein, A material is 0.5%, is 7.8% B material, grinds 14 hours, all the other process control and embodiment 1, the typical data of the magnetic properties of the obtained magnets are shown in Table 1.

Embodiment 3

[0085] The preparation process of B material is carried out as follows: batching and mixing, according to the composition formula W n Fe m o (n+3m / 2) , W is Co, m=2, n=1, m:n=2, and the rest are prepared in the manner of Example 1 as material B for use.

[0086] According to the composition formula Ca δ A σ R τ Fe 12 o 19 , A is Sr, R is La, and δ=0.548, σ=0.120, τ=0.542, σ+δ+τ=1.21, and the rest are prepared in the manner of Example 2 to prepare calcium permanent magnet ferrite calcined material. In this calcined powder, by mass fraction, add 7.81% B material, 0.9% CaSiO 3 , 0.8% sorbitol, at the same time, add the material A prepared by Example 1 with a mass fraction of 0.5%, and the rest of the process control is the same as in Example 2. The typical data of the magnetic properties of the obtained magnet are shown in Table 1 As shown, the microstructure of the magnet is as figure 2 shown. The SEM analysis of the magnet cross-section shows that the crystals have a...

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Abstract

The invention which discloses a hard calcium ferrite and a manufacturing method thereof belongs to the field of hard ferrites. The hard calcium ferrite comprises a main component of CadeltaAsigmaRtauFe12O19, wherein A is at least one element of Sr and Ba, and R is at least one element which is selected from La, Nd, and Pr and must contains La; a soft ferrite component with the composition formulaof WnFemO(n+3m / 2), wherein W is one or more of Mn, Co, Zn, and Ni; and a composite additive, wherein the composite additive contains at least an additive with the composition formula of MxBySizO(x+2z+3y / 2), and in the composition formula, M is one or more divalent metal elements, such as Sr, Ba, and Ca. The hard ferrite magnet obtained in the invention has a Br of 4200-4700 Gs, a HCJ of 4900-5700Oe, and a squareness ratio (Hk / HCJ) of above 90%, and especially has the Br of 4400-4700 Gs, the HCJ of 5000-5700 Oe, and the squareness ratio of above 95%, and simultaneously the production cost is substantially reduced.

Description

technical field [0001] The invention relates to a calcium permanent magnet ferrite and a manufacturing method thereof, and relates to the field of permanent magnet ferrite, in particular to sintered permanent magnet ferrite. Background technique [0002] According to its characteristics and uses, ferrite is generally divided into five categories: permanent magnet, soft magnet, moment magnet, gyromagnetic and pressure ferrite. Among them, high-performance permanent magnet ferrite, because of its high residual magnetic induction intensity , strong anti-demagnetization performance and low manufacturing cost and other advantages, widely used in electronics, information, motorcycles, automobiles, electric tools and other industries. The widely used ferrite material is Sr ferrite with M-type magnetoplumbite structure (SrFe 12 o 19 ) and Ba ferrite (BaFe 12 o 19 ), these ferrites are made of iron oxide and Sr or Ba carbonate as raw materials, and are manufactured by powder meta...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 王自敏李春明古文伟田泽民贺大松李恩田张云程任新民
Owner 自贡市江阳磁材有限责任公司
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