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

A high coercivity sintered CE magnet or CE-rich magnet and preparation method thereof

A technology with high coercive force and sintered state, which is applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high energy consumption, long tempering process cycle, low sintered coercive force, etc. Achieve the effects of avoiding diffusion, saving production time and energy consumption, and high coercive force

Active Publication Date: 2017-07-25
CENT IRON & STEEL RES INST
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the above-mentioned existing technologies can completely get rid of the traditional process route of sintered NdFeB magnets, which is characterized by low coercive force in the sintered state, and requires primary tempering and secondary tempering processes to increase the coercive force, and Long tempering process cycle and high energy consumption

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
  • A high coercivity sintered CE magnet or CE-rich magnet and preparation method thereof
  • A high coercivity sintered CE magnet or CE-rich magnet and preparation method thereof
  • A high coercivity sintered CE magnet or CE-rich magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] Such as Figure 5 As shown, the present invention provides a method for preparing a high-coercivity, sintered Ce magnet or Ce-rich magnet, the matching of the two main phase components, the combination of hydrogen control oxygen, fine temperature control and hierarchical sintering technology, and the specific preparation The process includes the following steps:

[0044] (1) Prepare two different main phase alloys separately. The first main phase is Ce-Fe-B phase dominated by Ce rare earth elements, which may contain a small amount of Pr, Nd, La, but does not contain Dy, Tb, Ho, etc. Rare earth element, belongs to low magnetic moment Js and low anisotropy field HA phase (lower magnetization ability), its composition is (Ce x RL 1-x ) a Fe 100-a-b-c B b TM c ; The second main phase is the Nd-Fe-B phase dominated by the rare earth element Nd, which does not contain La, Ce, but may contain heavy rare earth elements such as Dy, Tb, and Ho. It is a high magnetic moment Js and hi...

Embodiment 1

[0053] The design composition (wt.%) of the Ce-rich magnet is (Re 0.85 Ce 0.15 ) 29 Fe bal B 0.8 TM 0.5 , Re is one or more of Pr, Nd, La, Dy, Tb, Gd, Er, and Ho, and TM is one or more of Ga, Co, Cu, Nb, and Al.

[0054] (1) Prepare two different main phase alloys separately, according to the following chemical formula of mass percentage: (Ce 0.5 RL 0.5 ) 29 Fe bal B 0.8 TM 0.5 And RH 29 Fe bal B 0.8 TM 0.5 Prepare ingredients separately, RL is one or more of Pr, Nd, La, RH is one or more of Dy, Tb, Gd, Er, and Ho, TM is Ga, Co, Cu, Nb, One or more of Al elements;

[0055] (2) Melt the two different main phase alloys prepared in step (1) separately. After the raw materials are all melted, they are subjected to electromagnetic stirring and refining, and then the molten steel is poured onto a water-cooled copper roller with a linear velocity of 1.5m / s. Two quick-setting tablets with an average thickness of 0.1~0.5mm were prepared;

[0056] (3) Weigh the two kinds of quick-setting f...

Embodiment 2

[0064] The design composition (wt.%) of the Ce-rich magnet is (Re 0.7 Ce 0.3 ) 32 Fe bal B 1.2 TM 6 , Re is one or more of Pr, Nd, La, Dy, Tb, Gd, Er, and Ho, and TM is one or more of Ga, Co, Cu, Nb, and Al.

[0065] (1) Prepare two different main phase alloys separately, according to the following chemical formula of mass percentage: (Ce 0.8 RL 0.2 ) 32 Fe bal B 1.2 TM 6 And Nd 32 Fe bal B 1.2 TM 6 Prepare ingredients separately, RL is one or more of Pr, Nd, La, RH is one or more of Dy, Tb, Gd, Er, and Ho, TM is Ga, Co, Cu, Nb, One or more of Al elements;

[0066] (2) Melt the two different main phase alloys prepared in step (1) separately. After all the raw materials are melted, they are subjected to electromagnetic stirring and refining, and then the molten steel is poured onto a water-cooled copper roll with a linear velocity of 2m / s. Two quick-setting tablets with an average thickness of 0.1~0.5mm are obtained;

[0067] (3) Weigh the two kinds of quick-setting flakes obtaine...

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 belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a high coercivity sintering state Ce magnet or Ce-rich magnet and a preparation method therefor. The blank of the magnet is sintered by stages to directly obtain the magnet with the required magnetic performance; the magnet has a dual main phase structure of Ce-Fe-B and Nd-Fe-B; and the chemical formulas of the magnet, the first main phase and the second main phase are as follows in percentage by mass: (Re1-zCez)aFe100-a-b-cBbTMc, (CexRL1-x)aFe100-a-b-cBbTMc, (NdyRH1-y)aFe100-a-b-cBbTMc, wherein x is greater than or equal to 0.5 and less than or equal to 1.0; y is greater than or equal to 0 and less than or equal to 1.0; z is greater than or equal to 0.1 and less than or equal to 0.9; a is greater than or equal to 29 and less than or equal to 32; b is greater than or equal to 0.8 and less than or equal to 1.2; c is greater than or equal to 0.5 and less than or equal to 6; Re is two or more kinds of Pr, Nd, La, Dy, Tb, Gd, Er or Ho; RL is one or more of Pr, Nd or La; RH is one or more of Dy, Tb, Gd, Er or Ho; and TM is one or more of Ga, Co, Cu, Nb or Al. The magnet coercive force (Hcj) of the magnet is greater than 11kOe, and the magnetic energy product (BH)m can fully meet the commercial application demands, the production cost is reduced, and the technological process is shortened.

Description

Technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and particularly relates to a sintered high-coercivity Ce magnet or a Ce-rich magnet and a preparation method thereof. Background technique [0002] When the Ce content accounts for the largest weight of the total rare earths, we call it Ce magnets; when the Ce content accounts for 10% to 50% of the total rare earths, and the weight of the total rare earths is not the largest, we call them rich Ce magnet. [0003] Among natural rare earth resources, in addition to Nd, there are abundant and inexpensive metals Ce and La. The total abundance of Ce and La is three times that of Nd and Pr, and the price is less than one-tenth. [0004] For a long time, how to make good use of high-abundance rare-earth permanent magnet materials has always been a problem that plagued people. Early research on the application of high-abundance rare-earth elements in permanent magnet materials focu...

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): H01F1/053H01F1/057H01F41/02B22F3/16B22F9/04
Inventor 朱明刚李卫韩瑞宋利伟黄书林
Owner CENT IRON & STEEL RES INST