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

Method for making ferrite magnets, permanent magnet made by the method and motor comprising same permanent magnet

A technology of permanent magnet and ferrite, applied in the field of permanent magnet and magnetoplumbite magnet, can solve the problem of high cost

Inactive Publication Date: 2007-02-14
UGIMAG SA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The main problem with the above existing magnets is the high cost

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
  • Method for making ferrite magnets, permanent magnet made by the method and motor comprising same permanent magnet
  • Method for making ferrite magnets, permanent magnet made by the method and motor comprising same permanent magnet
  • Method for making ferrite magnets, permanent magnet made by the method and motor comprising same permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107] General Description of the Test

[0108] A total of 6 sets of tests (test numbers 1a, 1b, 1c to 6a, 6b and 6c) and 4 additional sets of tests (test numbers 7 to 10) were carried out below, which differed in chemical composition or combustion temperature.

[0109] For each set of tests, the same starting material providing the elements Fe, M, R and T was started and 3 mixtures with the same chemical composition were produced.

[0110] - all or part of the method according to the invention: tests 1c, 3c and 5c are according to the invention, tests 2c, 4c and 6c are part according to the invention;

[0111] - Wet methods according to the prior art: 1a to 6a;

[0112] - Dry methods according to the prior art: 1b to 6b;

[0113] For the same test group, in stage b), slag block B was formed under the same conditions, especially the same calcination temperature.

[0114] Figure 4 provides a general description of the method of the present invention.

[0115] raw material ...

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
densityaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention concerns a method for making ferrite magnets of formula M>1-xx12-yy19< comprising the following steps: a1) forming a powder mixture MP of related raw materials; a2) transforming into granules in green state A; b) calcining said granules in green state to form a clinker B; c) grinding by wet process said clinker B to obtain a homogeneous dispersion of fine particles C; d) concentrating and compressing said particles under an orienting magnetic field to form an anisotropic green compact D; e) sintering said anisotropic tablet in green state D to obtain a sintered element E. The invention is characterised in that: 1) in step a1) said mixture MP is formed from a dry mixture MS of M and Fe powder elements and a dispersion DF of said raw materials related to elements R and T; 2) in step b) said granules in green state are calcined at a temperature and for a time interval selected so as to obtain, at the incinerator furnace output (2) at the end of step b) a clinker B which is both homogeneous in chemical composition and size and with apparent low density, ranging between 2.5 and 3.5, and which is easy to crush during step c).

Description

technical field [0001] The present invention relates to the field of permanent magnets, in particular magnets of the ferrite type, including magnetoplumbite type magnets. Background technique [0002] The present invention relates to magnetoplumbite phase MFe 12 o 19 The ferrite type permanent magnet, wherein M=Sr, Ba, etc., and element M is partially replaced by element R selected from rare earth elements or element bismuth, and element Fe is partially replaced by at least one transition metal T. [0003] Such magnets are known to be highly magnetic, as described in Japanese patent application JP10-149910 or European patent application EP0905718 or international patent application WO99 / 34379. [0004] Lanthanum La is generally used as M and cobalt Co as R in these patent applications. [0005] The manufacture of such magnets involves the following stages: [0006] a) forming a dispersion by a wet process, or forming granules by a dry process, to form a raw material mixt...

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): C04B35/26C01G49/00H01F1/10H01F41/02C01G51/00H01F1/08H01F1/11
CPCC04B35/2633H01F41/0273C04B35/26
Inventor P·特纳伍德E·布兰杜
Owner UGIMAG SA