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Hexagonal magnetoplumbite permanent magnetic ferrite material and preparation method thereof

A technology of permanent magnet ferrite and magnetoplumbite, which is applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc. Energy requirements, high intrinsic coercivity, and the effect of improving specific saturation magnetization

Inactive Publication Date: 2020-07-03
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that the permanent magnet ferrite in the prior art is difficult to obtain high remanence and higher intrinsic coercive force at the same time, and cannot meet the increasingly higher requirements for use, and provides a hexagonal magnetoplumbite Permanent ferrite material and preparation method thereof, based on hexagonal Sr ferrite, adopting La 3+ with Ca 2+ co-replacing Sr 2+ position, the remanence and intrinsic coercive force of the obtained sintered permanent ferrite material have been significantly improved compared with the permanent magnet ferrite in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A hexagonal magnetoplumbite permanent magnet ferrite material, the main phase formula is: Sr 0.32 Ca 0.24 La 0.44 Fe 10.87 co 0.34 o 19 , its preparation method is:

[0044] (1) Ingredients: put iron red, strontium carbonate, calcium carbonate, lanthanum oxide, and cobalt oxide into a wet ball mill for 5 hours of mixed ball milling according to the molar ratio of each element in the main phase formula to obtain a powder with an average particle size of 0.8 μm. mixed slurry;

[0045] (2) Pre-burning: Dry the mixed slurry in an oven, then pelletize, pre-fire in the air at 1240°C, and keep it warm for 1 hour to obtain granular pre-fired material;

[0046] (3) Ball milling: Weigh 450g of calcined material, add SiO which accounts for 0.5wt% of solid content 2 , 0.75wt% CaCO 3 , 0.4wt% Cr 2 o 3 , then calcium gluconate accounting for a solid content of 0.6wt%, and then add 680mL of deionized water as a ball milling medium, and carry out 24h wet pulverization in a hi...

Embodiment 2

[0050] A hexagonal magnetoplumbite permanent magnet ferrite material, the main phase formula is: Sr 0.33 Ca 0.22 La 0.35 PR 0.10 Fe 10.91 co 0.34 o 19 , its preparation method is:

[0051] (1) Ingredients: put iron red, strontium carbonate, calcium carbonate, lanthanum oxide, praseodymium oxide, and cobalt oxide into a wet ball mill for 5 hours according to the molar ratio of each element in the main phase formula to obtain an average particle size of 0.8μm mixed slurry;

[0052] (2) Pre-burning: Dry the mixed slurry in an oven, then pelletize, pre-fire in the air at 1150°C, and keep warm for 2 hours to obtain granular pre-fired material;

[0053] (3) Ball milling: Weigh 450g of calcined material, add SiO which accounts for 0.5wt% of solid content 2 , 0.75wt% CaCO 3 , 0.4wt% Cr 2 o 3 , then calcium gluconate accounting for a solid content of 0.6wt%, and then add 680mL of deionized water as a ball milling medium, and carry out 24h wet pulverization in a high-efficien...

Embodiment 3

[0057] A hexagonal magnetoplumbite permanent magnet ferrite material, the main phase formula is: Sr 0.34 Ca 0.25 La 0.32 Nd 0.09 Fe 10.89 co 0.35 o 19 , its preparation method is:

[0058] (1) Ingredients: put iron red, strontium carbonate, calcium carbonate, lanthanum oxide, neodymium oxide and cobalt oxide into a wet ball mill for 5 hours according to the molar ratio of each element in the main phase formula, and the average particle size is 0.8μm mixed slurry;

[0059] (2) Pre-burning: Dry the mixed slurry in an oven, then pelletize, pre-fire in the air at 1240°C, and keep it warm for 1 hour to obtain granular pre-fired material;

[0060] (3) Ball milling: Weigh 450g of calcined material, add SiO which accounts for 0.5wt% of solid content 2 , 0.75wt% CaCO 3 , 0.4wt% Cr 2 o 3 , then calcium gluconate accounting for a solid content of 0.6wt%, and then add 680mL of deionized water as a ball milling medium, and carry out 24h wet pulverization in a high-efficiency bal...

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Abstract

The invention relates to the technical field of ferrite material preparation, and discloses a hexagonal magnetoplumbite permanent magnetic ferrite material and a preparation method thereof. The general formula of the permanent magnetic ferrite material is A1-x-yCaxRyFe2n-zMzO19, wherein A is Sr or Sr and Ba, R comprises La, and M comprises Co; and x ranges from 0.15 to 0.4, y ranges from 0.3 to 0.5, z ranges from 0.25 to 0.45, and n ranges from 5.3 to 5.7. The preparation method comprises the steps of burdening, presintering, ball milling, forming and sintering. On the basis of hexagonal Sr ferrite, La<3+> ions and Ca<2+> ions are adopted to jointly replace the position of Sr<2+>, damage to the crystal structure of the magnet is avoided, the substitution amount of Co<2+> ions is effectively increased, and the prepared permanent magnetic ferrite material can obtain high residual magnetism and intrinsic coercive force at the same time.

Description

technical field [0001] The invention relates to the technical field of ferrite material preparation, in particular to a hexagonal magnetoplumbite permanent magnet ferrite material and a preparation method thereof. Background technique [0002] Permanent magnetic materials are materials that can maintain constant magnetic properties once magnetized, also known as hard magnetic materials. In practical applications, permanent magnetic materials work in the demagnetization part of the second quadrant of the hysteresis loop. Commonly used permanent magnet materials are divided into alnico permanent magnet alloy, ferrite permanent magnet, rare earth permanent magnet and various composite permanent magnet materials. [0003] Permanent magnet ferrite magnet is one of the key basic functional materials of permanent magnet DC motors. It has the characteristics of high residual magnetic flux density, high coercive force and high magnetic energy product, and can meet various environment...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/32C04B35/34C04B35/28C04B35/30H01F1/10H01F41/02
CPCC04B35/2633C04B35/2641C04B35/265C04B2235/3217C04B2235/3224C04B2235/3227C04B2235/3241C04B2235/3275C04B2235/3279C04B2235/3284C04B2235/3298C04B2235/3409C04B2235/3418C04B2235/442C04B2235/48C04B2235/6584C04B2235/96H01F1/10H01F41/0253H01F41/0266
Inventor 杨武国申屠金昂方盛翔吴赛航何震宇
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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