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Hexagonal sintered permanent magnetic ferrite magnet and preparation method thereof

A technology of permanent ferrite and hexagonal crystal, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of poor intrinsic coercive force and magnetic properties, and reduce stacking faults problem, reduced dosage, cost-effective effect

Active Publication Date: 2017-08-18
马鞍山市鑫洋永磁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the poor magnetic properties of permanent magnet ferrite magnets in the prior art, such as residual magnetization and intrinsic coercive force, and provide a hexagonal sintered permanent ferrite magnet and a preparation method thereof. The magnet basically has an M-type magnetoplumbite structure, which is extremely useful for a wide range of magnetic applications, such as smart machines, automobiles, household appliances or power tools, etc., and has higher residual magnetization than conventional permanent ferrite magnets , intrinsic coercive force and squareness ratio Hk / Hcj, the magnetic properties are significantly optimized

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  • Hexagonal sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal sintered permanent magnetic ferrite magnet and preparation method thereof

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Embodiment 1

[0041] A kind of hexagonal crystal type sintered permanent ferrite magnet of the present embodiment, its composition formula uses A 2+ 1-x-y B 1+ y La 3+ x Fe 3+ n- z co 2+ z o 2- 19 Indicates that A is a mixture of divalent alkaline earth metals calcium, strontium, and barium, B is a mixture of monovalent alkali metals lithium, sodium, and potassium, and x, y, z, and n are the addition ratios of each element, where x is 0.24-0.45 , y is 0.03-0.10, z is 0.20-0.33, n is 10.0-12.0, and 1.1z≤x≤1.8z, y+z≤x. Such as figure 1 Shown, its preparation method comprises the following steps:

[0042] Step 1. Ingredients mixing: press A 2+ 1-x-y B 1+ y La 3+ x Fe 3+ n-z co 2+ z o 2- 19 The composition formula weighs and calculates the raw material powder containing the required elements, and mixes the raw materials uniformly through a wet process for 1 hour. The average particle size of the mixed material after mixing reaches 0.6um, and the reactivity is better, wh...

Embodiment 2

[0052] A kind of hexagonal crystal type sintered permanent ferrite magnet of the present embodiment, its composition formula uses A 2+ 1-x-y B 1+ y La 3+ x Fe 3+ n- z co 2+ z o 2- 19 Indicates that A is divalent alkaline earth metal calcium, B is monovalent alkali metal lithium, and x, y, z, n are the addition ratios of each element, where x is 0.24-0.45, y is 0.03-0.10, and z is 0.20-0.33 , n is 10.0-12.0, and 1.1z≤x≤1.8z, y+z≤x. Its preparation method is basically the same as Example 1, and the difference is that the raw material ingredients and processing method of the present embodiment are slightly different, as follows:

[0053] Raw material powder is iron oxide (Fe 2 o 3 ) powder, calcium carbonate (CaCO 3 ) powder, lanthanum oxide (La 2 o 3 ) powder, cobalt oxide (Co 2 o 3 ) powder, lithium carbonate (Li 2 CO 3 ) powder; also add an additive as follows: 0.5wt% SiO 2 Powder, 0.2wt% H 3 BO 3 Powder, 0.5wt% lithium chloride, 0.5wt% calcium chloride...

Embodiment 3

[0061] A kind of hexagonal crystal type sintered permanent ferrite magnet of the present embodiment, its composition formula uses A 2+ 1-x-y B 1+ y La 3+ x Fe 3+ n- z co 2+ z o 2- 19 Indicates that A is the divalent alkaline earth metal strontium, B is the monovalent alkali metal sodium, x, y, z, and n are the addition ratios of each element, where x is 0.24-0.45, y is 0.03-0.10, and z is 0.20-0.33 , n is 10.0-12.0, and 1.1z≤x≤1.8z, y+z≤x. Its preparation method is basically the same as Example 1, and the difference is that the raw material ingredients and processing method of the present embodiment are slightly different, as follows:

[0062] Raw material powder is iron oxide (Fe 2 o 3 ) powder, strontium carbonate (SrCO 3 ) powder, lanthanum oxide (La 2 o 3 ) powder, cobalt oxide (Co 2 o 3 ) powder, sodium carbonate (Na 2 CO 3 ) powder, also added with an additive as follows: 0.3wt% sodium chloride, 0.3wt% strontium chloride. The above-mentioned ingredi...

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Abstract

The invention discloses a hexagonal sintered permanent magnetic ferrite magnet and a preparation method thereof and belongs to the field of permanent magnetic ferrite magnets. The composition formula of the hexagonal sintered permanent magnetic ferrite magnet is represented as A<2+>(1-x-y)B<1+>yLa<3+>xFe<3+>(n-z)Co<2+>zO<2->19, A is at least one of divalent alkaline earth metal Ca, Sr and Ba, B is at least one of univalent alkali metal Li, Na and K, x, y, z and n represent adding proportions of elements respectively, wherein x is 0.24-0.45, y is 0.03-0.10, z is 0.20-0.33, n is 10.0-12.0, x is larger than or equal to 1.1z and smaller than or equal to 1.8z, and the sum of y and z is smaller than or equal to x. The preparation method of the hexagonal sintered permanent magnetic ferrite magnet comprises steps as follows: material mixing, pre-sintering, coarse crushing, ball milling, forming, sintering and the like. The magnet has an M type magnetoplumbite structure basically and has higher residual magnetization and higher intrinsic coercivity / squareness ratio (Hk / Hcj) than a traditional permanent magnetic ferrite magnet, and the magnetic performance is remarkably optimized.

Description

technical field [0001] The invention relates to the technical field of permanent ferrite magnets, in particular to a hexagonal sintered permanent ferrite magnet and a preparation method thereof. Background technique [0002] M-type magnetoplumbite permanent ferrite magnet is composed of divalent cation metal oxides (SrO and BaO) and ferric oxide (Fe 2 o 3 ) is a general term for compounds composed of permanent ferrite magnets, which are widely used in automobiles, household appliances, industrial automation and other industries. As a permanent ferrite material, strontium ferrite (SrFe) with M-type magnetoplumbite structure 12 o 19 ) and barium ferrite (BaFe 12 o 19 )is widely used. The two main parameters that affect the magnetic properties of sintered permanent ferrite are residual magnetic flux density (Br) and intrinsic coercive force (Hcj). The residual magnetic flux density (Br) of a magnet is determined by the density, degree of orientation, and saturation magne...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01F1/34H01F41/02
CPCC04B35/2633C04B35/2641C04B35/622C04B2235/3201C04B2235/3203C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3227C04B2235/3275H01F1/348H01F41/0266
Inventor 翁革平李东
Owner 马鞍山市鑫洋永磁有限责任公司
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