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

Hard magnet ferrite ceramics parts magnetic field gel inject film forming method

A hard ferrite and gel injection molding technology, applied in the field of ceramic materials, can solve the problems of high friction resistance, difficult to manufacture large-size hard ferrite products, and low degree of consistent orientation of magnetic domains, and achieve consistent magnetic domains. good orientation

Inactive Publication Date: 2008-07-23
UNIV OF SCI & TECH BEIJING
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the friction resistance between dry powder particles is large, which is not conducive to the orientation of particles
On the other hand, dry pressing under a strong magnetic field is used. Due to the uneven distribution of the magnetic field in the green body, the uniform orientation of the magnetic domains in the green body is not high. Therefore, it is difficult to manufacture large-sized hard ferrite products.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Magnetic Field Gel Casting of Strontium Ferrite Ceramic Components

[0014] Strontium ferrite is commercially available industrial powder with a purity of more than 97%; acrylamide (AM), N,N'-methylenebisacrylamide (MBAM), ammonium persulfate (APS) and catalyst N, N, N ', N'-tetramethylethylenediammonium (TEMED) are all produced by Sinopharm Chemical Reagent Co., Ltd. N, N, N', N'-tetramethylethylenediammonium is a colorless and transparent solution, and ammonium persulfate is white Crystalline, others are white powder. Ammonium polyacrylate (PPA-NH 4 ) is produced by Guangzhou Dongting Industry and Trade Co., Ltd., with a standard content of 30wt%, a yellow solution.

[0015] Dissolve 8g of acrylamide and 2g of N,N'-methylenebisacrylamide in 100ml of deionized water to make a solution, add 510g of strontium ferrite powder and 2.6g of ammonium polyacrylate, and ball mill for 24 hours. Add dropwise 0.12ml of ammonium persulfate solution of 10wt% concentrati...

Embodiment 2

[0017] Example 2: Magnetic field gel injection molding of barium ferrite ceramic components

[0018] Barium ferrite is a commercially available industrial powder with a purity of more than 97%; acrylamide (AM), N,N'-methylenebisacrylamide (MBAM), ammonium persulfate (APS) and catalyst N, N, N ', N'-tetramethylethylenediammonium (TEMED) are all produced by Sinopharm Chemical Reagent Co., Ltd. N, N, N', N'-tetramethylethylenediammonium is a colorless and transparent solution, and ammonium persulfate is white Crystalline, others are white powder. Ammonium polyacrylate (PPA-NH 4 ) is produced by Guangzhou Dongting Industry and Trade Co., Ltd., with a standard content of 30wt%, a yellow solution.

[0019] Dissolve 8g of acrylamide and 2g of N,N'-methylenebisacrylamide in 100ml of deionized water to make a solution, add 520g of barium ferrite powder and 2.6g of polyacrylamide dispersant, and ball mill for 24 hours. Add dropwise 0.12ml of ammonium persulfate solution of 10wt% conc...

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

The invention discloses a magnetic field jelly glue injection mold formation method of a hard ferrite ceramic component, which belongs to the material field and is characterized in that the jelly glue injection mold formation method is adopted, the characteristic that the particles are easy to turn in the sizing material is utilized, the jelly glue is formed by injection molding under low intensity magnetic field of 5-30mT and a hard ferrite blank body with uniform magnetic domain and good orientation performance is obtained, thus obtaining a hard magnet with high magnetic induction. The invention is realized according to the following procedures: 1) an acrylamide jelly glue system is adopted and hard ferrite sizing material with the solid volume fraction of 51Vol% and the viscosity of 700-900mP.s is prepared; 2) the hard ferrite blank body with high magnetic characteristics is obtained. The sizing material is the hard ferrite sizing material with high solid phase and low viscosity, which is made of acrylamide jelly glue by the injection molding technology, a monomer is acrylamide and crosslinking agent is N, N'-methylene-bis acrylamide, the dispersant is ammonium polyacrylate, the initiator is ammonium persulfate and the catalyst is N, N, N', N'- tetramethy lethylenediamine. The invention has the advantages that the product is formed under the low intensity magnetic field to obtain the hard ferrite blank body with uniform magnetic domain, good orientation, large size and complex shape.

Description

technical field [0001] The invention belongs to the field of ceramic materials and relates to a magnetic field gel injection molding method for hard ferrite ceramic parts. Background technique [0002] Hard ferrite is widely used in the field of modern science and industrial technology, and the level of magnetic induction is one of the important indicators to evaluate its performance. At present, hard ferrite materials are mostly formed by dry pressing under a strong magnetic field (above 100mT) to achieve consistent orientation of the magnetic domains in the powder particles and to increase the magnetic induction of the material. However, the friction resistance between dry powder particles is large, which is not conducive to the orientation of particles. On the other hand, dry pressing under strong magnetic field is used. Due to the uneven distribution of magnetic field in the green body, the uniform orientation of magnetic domains in the green body is not high. Therefore...

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 Applications(China)
IPC IPC(8): B28B15/00B28C1/04B28C1/06B28B1/02B28B1/087B28B11/24
Inventor 郭志猛石棋郝俊杰
Owner UNIV OF SCI & TECH BEIJING