Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof

A technology of permanent magnet ferrite and hexagonal crystal, which is applied in the field of hexagonal crystal M+W hybrid sintered permanent ferrite magnet and its preparation, can solve the problems of difficult to expect a dramatic improvement in magnetic properties, and achieve the effect of low cost

Active Publication Date: 2014-02-05
ANHUI SINOMAG TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of such efforts, the magnetic properties of M-type ferrite magnets are approaching their upper limit, and it is difficult to expect a dramatic improvement in magnetic properties

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
  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Research on La addition amount:

[0042] Weigh the specified amount of iron oxide (Fe 2 O 3 ) Powder (purity≥99.0wt%, original average particle size of particles: 0.7~1.0μm), calcium carbonate (CaCO 3 ) Powder, (purity≥98.5wt%, original average particle size of particles: 2.0~5.0μm), strontium carbonate (SrCO 3 ) Powder (purity≥98.5wt%, original average particle size of particles: 1.0~2.0μm), barium carbonate (BaCO 3 ) Powder (purity≥98.5wt%, original average particle size of particles: 1.0~2.0μm), lanthanum oxide (La 2 O 3 ) Powder (purity≥99.0wt%, original average particle size of particles: 2.0~5.0μm), add 0.3wt% SiO to the above mixture 2 Powder (purity ≥98.0wt%, original average particle size of particles: 1.0μm), 0.1wt% H 3 BO 3 Powder (purity ≥99.0wt%) and wet mixing, the average particle size of the mixture after mixing is 0.9μm. After the mixture was dried, it was calcined in the atmosphere at 1280°C for 2 hours.

[0043] The obtained calcined material particles are ...

Embodiment 2

[0055] Research on the number of moles of iron:

[0056] Use the same iron oxide (Fe 2 O 3 ) Powder, calcium carbonate (CaCO 3 ) Powder, strontium carbonate (SrCO 3 ) Powder, barium carbonate (BaCO 3 ) Powder and lanthanum oxide (La 2 O 3 ) Powder, mixed into Ca x1 Sr x2 Ba x3 La x Fe 2+ a Fe 3+ b Oy (where x1=0.15, x2=0.35, x3=0.3, x=0.2, a+b=11.5, 12.5, 13.5, 14.5 and 15.5) composition. Add 0.3wt% SiO to the above mixture 2 Powder, 0.1wt% H 3 BO 3 Powder and wet mixing, the average particle size of the mixture is 0.9μm. After the mixture was dried, it was calcined in the atmosphere at 1280°C for 2 hours.

[0057] The obtained calcined material particles are subjected to dry coarse pulverization in a vibration mill to obtain coarse powder with an average particle size of 3.0-5.0 μm.

[0058] Next, weigh 500 grams of the above coarse powder and add 0.25wt% of SiO 2 , 0.60wt% CaCO 3 , 0.80wt% Cr 2 O 3 , 0.10wt% H 3 BO 3 , 0.25wt% Al 2 O 3 , 0.20wt% ZnO, 0.25wt% Mn 3 O 4 , 0.60wt%...

Embodiment 3

[0070] Research on sintering atmosphere and carbon black addition:

[0071] Use the same iron oxide (Fe 2 O 3 ) Powder, calcium carbonate (CaCO 3 ) Powder, strontium carbonate (SrCO 3 ) Powder, barium carbonate (BaCO 3 ) Powder and lanthanum oxide (La 2 O 3 ) Powder, mixed into Ca x1 Sr x2 Ba x3 La x Fe 2+ a Fe 3+ b Oy (x1=0.15, x2=0.35, x3=0.3, x=0.2, a+b=13.5) composition. Add 0.3wt% SiO to the above mixture 2 Powder (purity ≥98.0wt%, original average particle size of particles: 1.0μm), 0.1wt% H 3 BO 3 Powder (purity ≥99.0wt%) and wet mixing, the average particle size of the mixture is 0.9μm. After the mixture was dried, it was calcined in the atmosphere at 1280°C for 2 hours.

[0072] The obtained calcined material particles are subjected to dry coarse pulverization in a vibration mill to obtain coarse powder with an average particle size of 3.0-5.0 μm.

[0073] Next, weigh 5 parts of the above coarse powder each 500 g, add 0.25wt% of SiO 2 , 0.60wt% CaCO 3 , 0.80wt% Cr 2 O 3 ...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
heightaaaaaaaaaa
Login to view more

Abstract

The invention discloses a hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and a preparation method thereof. The composition formula of the hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet is represented by Cax1Srx2Bax3LaxFe2+aFe3+bOy, wherein x1 is 0.1-0.3, x2 is 0.2-0.5, x3 is 0.1-0.4, x is 0.1-0.3, a is 0.1-1.0, b is 12.0-14.0, 12.1<=a+b<=15.0, and y=1+1 / 2x+a+3 / 2b. Lanthanum oxide is added, the mole number of iron in the M type ferrite is enhanced, and the oxygen concentration in the sintering process is controlled to provide a appropriate non-oxidizing atmosphere so as to inhibit the generation of the alpha-Fe2O3 phase, so that the M+W mixed type magnetoplumbite structure can be generated in the original M type permanent magnetic ferrite. The invention has the following advantages: (1) compared with the single-phase M type ferrite, the invention enhances the residual flux density (Br) of the material, and maintains the high coercive force (Hcj); (2) compared with the single-phase W type ferrite, the invention has simpler production technique, and can perform industrial production only by slightly adjusting the M type permanent magnetic ferrite production technique; and (3) the magnet is free of rare and noble metal cobalt, and thus, the cost is lower.

Description

Technical field [0001] The invention relates to a high-performance permanent ferrite magnet, in particular to a hexagonal crystal M+W hybrid sintered permanent ferrite magnet and a preparation method thereof. technical background [0002] M-type magnetoplumbite permanent ferrite magnet is a general term for compounds composed of divalent cation metal oxides (SrO and BaO) and ferric oxide (Fe2O3). Permanent ferrite magnets are widely used in automobiles and households. Electrical appliances, industrial automation and other industries. As a permanent ferrite material, strontium ferrite with M-type magnetoplumbite structure (SrFe 12 O 19 ) And barium ferrite (BaFe 12 O 19 )is widely used. For M-type ferrite magnets, the main focus is on making the grain size of the ferrite grains close to the single domain grain size, aligning the ferrite grains in the direction of magnetic anisotropy, and achieving high density. Efforts. As a result of this effort, the magnetic performance of th...

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): C04B35/26C04B35/622
Inventor 翁革平
Owner ANHUI SINOMAG TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap