Method of raising permanent magnetic ferrite residual magnetization by adding additive

A technology of permanent ferrite and additives, applied in the direction of magnetism of inorganic materials, can solve problems such as reducing coercive force

Inactive Publication Date: 2003-04-30
BGRIMM TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the remanence reaches a certain level, it will be difficult to further improve it. It is also reported that bismuth oxide and other magnetic

Method used

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  • Method of raising permanent magnetic ferrite residual magnetization by adding additive
  • Method of raising permanent magnetic ferrite residual magnetization by adding additive

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Example 1: Use the common brand Y30 primary pre-fired ball material commonly used at present as raw material, the secondary process formula is calcium carbonate 1wt%, silicon dioxide 0.4wt%, in the guarantee H bc In the case of more than 2600Oe, use the conventional method—increase the content of calcium carbonate and increase the sintering temperature to increase the remanence. The content of calcium carbonate is gradually increased from 1wt% to 1.35wt%. At the same time, the set value of the furnace temperature is increased from 1215°C to 1235°C. Result: Remanence B r Increased from 3870Gs to 4020Gs, coercivity H bc From 3060Oe to 2770Oe, the intrinsic coercivity H ic From 3200Oe down to 2840Oe. Further increasing the calcium carbonate content, the remanence does not increase, but the coercive force further decreases; continue to increase the furnace temperature, the remanent magnetism tends to decrease, and the coercive force decreases significantly. Add the addit...

example 2

[0011] Example two: use Y30 calcined material as raw material, the secondary process formula is calcium carbonate 1wt%, kaolin 0.5wt%, on this basis, the statistical average value of the production results before and after the application of the additive of the present invention is shown in Table 1.

[0012] category

example 3

[0013] Example 3: Use Y35 brand higher-grade calcined material as raw material, the secondary process formula is calcium carbonate 1wt%, silicon dioxide 0.3wt%, on this basis, the production results before and after applying the additive of the present invention are compared, see Table 2.

[0014] category

B r

(Gs)

h bc (Oe)

h ic (Oe)

(BH) m (MGOe)

not added

4070

2640

2700

4.02

add

4190

2650

2760

4.15

[0015] According to the use example above, application additive of the present invention, remanence B r Increased 120 ~ 150Gs. In the process of making other high-coercivity products that add alumina, add the additive additive of the present invention, remanence B r Also improved by more than 50Gs.

[0016] The additive of the present invention is used in the secondary process of permanent magnet ferrite production, where the secondary process is as the secondary pro...

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Abstract

An additive to be used for raising the residual magnetism of ferrite in permanent magnetism adds an additive of raising the residual magnetism with the molecular formula of MxSiyO2, where X=1=4, y=0-2, Z=2-6 in addition to add calcium carbonate and 1-4 additives of kaolin silica, aluminium oxide and boracic acid to increase its coercive force in the secondary process during production course of strontium ferrite or barium ferrite, where X, Y and Z can be decimal and M is one or more kinds of mixtures of Fe, Pr, Nd, Mn, Sr and C. With the same raw material, by use of the additive of MxSiyO2 ofthe present invention, the residual magnetism can be raised by 50-150 Gs based on 3600-4100 Gs.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet ferrite preparation, in particular to a method for adding an additive to improve the remanence of permanent magnet ferrite. Background technique [0002] Permanent ferrite mainly refers to hexagonal M-type strontium ferrite or barium ferrite, and its magnetic performance indicators mainly include remanence, coercive force, and magnetic energy product. The higher the three indicators, the better the performance of the magnet. The remanence and the coercive force affect each other. Increasing the remanence will easily lead to a decrease in the coercivity. Conversely, increasing the coercivity will easily lead to a decrease in the remanence. The energy product is related to the remanence and coercivity. Each indicator has a maximum theoretical value. For example, the maximum theoretical value of remanence is 4650Gs. See "Ferrite" edited by Youwei, Jiangsu Science and Technology Press, 1996,...

Claims

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Application Information

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IPC IPC(8): H01F1/10
Inventor 林国标柴立民左珑黄可淼
Owner BGRIMM TECH CO LTD
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