Unlock instant, AI-driven research and patent intelligence for your innovation.

Magnet powder, and method for preparing magnet by using the powder

A technology of magnets and powders, applied in the direction of magnetism of inorganic materials, can solve the problems of high magnetic field strength requirements, increased equipment load, difficulty in control, etc., to achieve high sintering density and orientation, reduced raw material costs, and low purity requirements.

Active Publication Date: 2010-07-28
佛山市顺德区霸菱磁电有限公司 +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The requirement for magnetic field strength is high. On the one hand, it is not easy to be stable, which brings certain difficulties to the control. On the other hand, it also increases the load on the equipment, which is easy to cause failure.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnet powder, and method for preparing magnet by using the powder
  • Magnet powder, and method for preparing magnet by using the powder
  • Magnet powder, and method for preparing magnet by using the powder

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0059] This embodiment has a ferrite main phase of the following molecular formula:

[0060] (M 1-x A x )O·n(Fe 1-y D. y ) m o 3 ,

[0061] Wherein M is at least one element in strontium and barium;

[0062] A is at least one element of rare earth elements and bismuth, and A must contain lanthanum;

[0063] D is at least one element among cobalt, manganese and zinc, and D must contain cobalt;

[0064] x, m, n, y represent molar ratios, satisfying x=mny, and x=0.1-0.4, m=1.93-2.00, n=6.2-6.4.

[0065] refer to Image 6 , Figure 8 , Figure 9 , Different values ​​of x, m, and n have different effects on Br and Hcj when the ferrite used is sintered at 1223°C and 1230°C. Among them, when x=0.25-0.35, m=1.95-1.97, and n=6.3, Br and Hcj have relatively high values. Therefore, x=0.25-0.35, m=1.95-1.97, and n=6.3 are the optimum values ​​of x, m, and n.

[0066] For the sintering of the magnetic powder with the above ferrite main phase molecular formula into ferrite, th...

specific Embodiment 2

[0081] The present embodiment selects raw material with embodiment 1. The manufacturing method is characterized by: in,

[0082] When weighing, measure according to (Srl-xLax)0·6.3(Fel-yCoy)mO3. Where x=0.3, so the metering formula is (Sr0.7La0.3)O·6.3(Fe 1-y D. y ) m o 3 .

[0083] Adjust m, and weigh the experiment according to m=1.93, 1.95, 1.97, 2.00 respectively, and y is calculated by formula x=mny.

[0084] In the fine grinding process, put the coarse powder into a ball mill, add water and other additives, and finely grind until the average particle size is about 0.73 microns.

[0085] The highest sintering temperature of the product is 1223°C and 1237°C. The magnetic properties of the resulting product are as Figure 8 shown. It can be seen from the figure that when m=1.95-1.97, Br and Hcj have relatively high values. All the other processing steps are identical with embodiment 1.

specific Embodiment 3

[0086] The characteristics of this embodiment are: in the manufacturing method, the selected raw materials are the same as those in Embodiment 1.

[0087] When weighing, adjust the molar ratio n, weigh the experiment respectively by n=6.2, 6.3, 6.4, x=0.3,

[0088] m=1.97, y is calculated by the formula x=mny, and the molecular formula for measurement is:

[0089] (Sr 0.7 La 0.3 )O·n(Fe 1-y D. y ) 1.97 o 3 .

[0090] Grind the end face of the fired magnet block and test the magnetic properties. The highest sintering temperature of the product is 1220°C and 1229°C, and the magnetic properties of the product are as follows: Figure 9 shown. It can be seen from the figure that when n=6.3, Br and Hcj have relatively high values.

[0091] In other embodiments of the present invention, the ferrite main phase having the following molecular formula:

[0092] (M 1-x A x )O·n(Fe 1-y D. y ) m o 3 ,

[0093] Wherein M can also select barium element;

[0094] A can choos...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Characters of the magnet powder are that the powder possesses main phase of ferrite with following molecular formula: (M1-xAx)O .n(Fe1-yDy)mO3, where M is as at least one element from strontium, barium; A is as at least one rare earth element and bismuth, and contains lanthanum; D is at least one element from cobalt, manganese or zinc, and must contain cobalt; x, m, n, y represent mol ratios satisfying x=mny and x=0.1-0.4, m=1.93-2.00,n=6.2-6.4. The invention also discloses preparation method for sintering magnet from magnet powder. Advantages are: low request on raw material, few fabricatingprocedures, no environment pollution, low cost, and higher magnetic capability of products obtained.

Description

technical field [0001] The invention relates to a magnet powder and a method for manufacturing a magnet by using the magnet powder. It belongs to the technical field of electromagnetic industry. Background technique [0002] Permanent magnet materials based on strontium and barium ferrite have been widely used in industry and daily life because of their rich source of raw materials and high cost performance. [0003] The main parameters of the magnetic properties of ferrite products are residual magnetic induction Br and intrinsic coercive force Hcj. The influence of residual magnetic induction Br and intrinsic coercive force Hcj is as follows: [0004] 1. By Br∝Ms·ρ·f, where Ms is the saturation magnetization, ρ is the density, and f is the degree of orientation. Br should be high, the above factors should be high, and the ferrite microstructure should be homogenized. To make Ms high, the proportion of ferrite phase in the magnet should be as large as possible, the impu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10H01F1/34
Inventor 陈国权林毅
Owner 佛山市顺德区霸菱磁电有限公司