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Preparation method of high-performance M type calcium-strontium ferrite and product

A high-performance technology of strontium ferrite, applied in the field of preparation of calcium strontium ferrite, can solve the problems of unstable performance of calcium strontium ferrite, difficult control of production process, high price of rare earth elements, and avoid the formation of magnetic parts. Difficult, easy to control the production process, to avoid the effect of long-term grinding

Inactive Publication Date: 2017-12-15
SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the many types of additives in the existing secondary ball milling step, the production process is difficult to control, and the price of rare earth elements is high, which increases the production cost. In addition, different additives cause the problem of unstable performance of calcium strontium ferrite. The present invention provides A kind of preparation method of high-performance M-type calcium strontium ferrite, additive kind is single, is convenient to the control of production process, the price of single additive is low, has reduced production cost; Improve the residual magnetic induction intensity (Br) of calcium strontium ferrite simultaneously ) and intrinsic coercive force (Hcj)

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  • Preparation method of high-performance M type calcium-strontium ferrite and product
  • Preparation method of high-performance M type calcium-strontium ferrite and product
  • Preparation method of high-performance M type calcium-strontium ferrite and product

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preparation example Construction

[0036] The preparation method of the high-performance M-type calcium strontium ferrite of the present invention comprises: a calcining process, after the calcining process, lithium carbonate powder is added to the calcined material. Here: the pre-sintered material can be ball-milled first, and then mixed with lithium carbonate powder; the pre-sintered material can also be mixed and ball-milled with lithium carbonate powder.

[0037] In the present invention, the calcined material and lithium carbonate powder are mixed and ball milled together, and the secondary ball milling process: the calcium strontium ferrite calcined material with an average particle size of 4 μm is used as raw material, lithium carbonate powder and dispersant are added, carbonic acid The amount of lithium powder added is 0.05-0.25wt% of the weight of the calcined material; ball: material: water = 15: 1: 2, ball milling on a rolling wet ball mill with a rotating speed of 80-100r / min, and the ball milling ti...

Embodiment 1

[0042] The preparation method of the high-performance M-type calcium strontium ferrite of the present invention comprises: (1) secondary ball milling process: take the calcium strontium ferrite calcined material with an average particle size of 4 μm as raw material, add lithium carbonate powder and dispersant , the addition of lithium carbonate powder is 0.05wt% of calcined material weight; Ball: material: water=15:1:2, ball milling on the rolling wet ball mill that rotating speed is 80r / min, ball milling time is 12h; Dispersant is The mixture of calcium gluconate and sorbitol, wherein the proportion of calcined feed weight is: 0.5% calcium gluconate, 0.8% sorbitol;

[0043] (2) Press green body process: adopt Fischer's average particle size measuring instrument to test its average particle size, slurry particle size is controlled at 0.8 μ m, then discharging, the water content of mixture is controlled at 30wt%; Slurry is pressed into blank, The forming magnetic field is 850kA...

Embodiment 2

[0047] The preparation method of the high-performance M-type calcium strontium ferrite of the present invention comprises: (1) secondary ball milling process: take the calcium strontium ferrite calcined material with an average particle size of 4 μm as raw material, add lithium carbonate powder and dispersant , the addition of lithium carbonate powder is 0.10wt% of calcined weight; Ball: material: water=15:1:2, ball milling on the rolling wet ball mill that rotating speed is 100r / min, ball milling time is 16h; Dispersant is The mixture of calcium gluconate and sorbitol, wherein the proportion of calcined feed weight is: 0.1% calcium gluconate, 0.3% sorbitol;

[0048] (2) Press green body process: adopt Fischer's average particle size measuring instrument to test its average particle size, slurry particle size is controlled at 0.8 μ m, then discharging, the water content of mixture is controlled at 40wt%; Slurry is pressed into blank, The forming magnetic field is 950kA / m and p...

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Abstract

The invention discloses a preparation method of high-performance M type calcium-strontium ferrite and a product and belongs to the technical field of magnetic materials. The method comprises a pre-sintering process, and lithium carbonate powder is added to a pre-sintered material after pre-sintering and accounts for 0.05wt%-0.25wt% of the pre-sintered material by weight. According to the method, the pre-sintered material can be subjected to ball-milling firstly and then is mixed with the lithium carbonate powder; the pre-sintered material can also be subjected to mixed ball-milling together with the lithium carbonate powder. With the adoption of the preparation method of the high-performance M type calcium-strontium ferrite, a single type additive is adopted, so that control of a production process is convenient, residual magnetic flux density (Br) and intrinsic coercive field (Hcj) of the calcium-strontium ferrite are improved, the cost of the single type additive is low, and the production cost is reduced accordingly.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and more specifically relates to a preparation method and product of calcium strontium ferrite. Background technique [0002] M-type calcium strontium ferrite is an important electronic functional material with high coercive force, magnetocrystalline anisotropy and chemical stability, widely used in electric tools, automobile motors, compressors, computer industry, toys industries and home appliances. With the rapid development of these fields, the high performance and miniaturization of permanent magnet ferrite materials are promoted. However, there are two main parameters affecting the magnetic properties of permanent magnet ferrite materials, namely residual magnetic induction (Br) and intrinsic correction. Coercive force (Hcj): The residual magnetic induction (Br) of a magnet is determined by the density, degree of orientation, and saturation magnetization (4πIs) of the crystal st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/63C04B35/632
CPCC04B35/2683C04B35/622C04B35/6303C04B35/632C04B35/6325C04B2235/3203C04B2235/5445C04B2235/602C04B2235/605C04B2235/656C04B2235/6567
Inventor 赵修彬蔡家海邱伟国吴刚马宝
Owner SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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