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

Pr-Fe-(C, B) rare earth permanent magnet material and preparation method thereof

A rare earth permanent magnet, pr-fe-technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of low coercive force of permanent magnet materials, complicated preparation process, and excessive grain growth and other problems, to achieve the effect of shortening the annealing time, uniform composition, and fine grains

Pending Publication Date: 2021-06-18
BEIJING UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coercive force of the permanent magnet material obtained by this method is very low, because the grains grow excessively after a long time of annealing.
And from the perspective of economic production, such a long time annealing is not conducive to industrial production
In the patent with the publication number "CN1059618A", a method for preparing an anisotropic bonded magnet is mentioned. In this method, B is used to replace the known Nd 2 Fe 14 A small amount of C, through smelting, annealing at 900-1050°C for at least 4 days, and subsequent ball milling, can increase the coercive force to 500kA / m. Although this method improves the coercive force to a certain extent, the preparation process The process is complicated, and the obtained coercivity is not too high

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
  • Pr-Fe-(C, B) rare earth permanent magnet material and preparation method thereof
  • Pr-Fe-(C, B) rare earth permanent magnet material and preparation method thereof
  • Pr-Fe-(C, B) rare earth permanent magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) According to the stoichiometric ratio Pr 15 Fe 79 C 3.6 B 2.4 Proportioning, wherein, the quality of Pr and according to general formula Pr 15 Fe 79 C 3.6 B 2.4 Compared with the calculated mass, it has increased by 1%;

[0031] (2) Put Pr, FeC, and FeB with a purity higher than 99% in a water-cooled copper crucible of a high-frequency induction melting furnace, and vacuumize so that the vacuum degree reaches 5×10 -2 Pa; then fill the cavity with high-purity argon to make the furnace pressure reach 70kPa. Power on; heat up to 1600°C to melt the sample, stop after 60 seconds of melting; repeat the melting 4 times, after the sample is completely cooled, take it out of the furnace for use;

[0032] (3) Break the ingot and put it into the quartz tube of the melt quenching furnace. The diameter of the nozzle at the bottom of the quartz tube is 1mm, and the bottom of the quartz tube is 4mm away from the copper roller; close the cavity and vacuumize the cavity of the...

Embodiment 2

[0036] (1) According to the stoichiometric ratio Pr 15 Fe 79 C 3.3 B 2.7 Proportioning, wherein, the quality of Pr and according to general formula Pr 15 Fe 79 C 3.3 B 2.7 Compared with the calculated mass, it has increased by 1%;

[0037] (2) Pr, FeC, and FeB with a purity higher than 99% are packed in the crucible of the induction melting furnace, and the vacuum is evacuated so that the vacuum degree reaches 5×10 -2 Pa; then fill the cavity with high-purity argon to make the furnace pressure reach 70kPa. Power on; heat up to 1600°C to melt the sample, stop after 60 seconds of melting; repeat the melting 5 times, after the sample is completely cooled, take it out of the furnace for use;

[0038] (3) Break the ingot and put it into the quartz tube of the melt quenching furnace. The diameter of the nozzle at the bottom of the quartz tube is 1.5mm, and the bottom of the quartz tube is 4mm away from the copper roller; Vacuum, so that the vacuum degree reaches 9×10 -4 Pa...

Embodiment 3

[0041] (1) According to the stoichiometric ratio Pr 15 Fe 79 C 3 B 3 Proportioning, wherein, the quality of Pr and according to general formula Pr 15 Fe 79 C 3 B 3 Compared with the calculated mass, it has increased by 1%;

[0042] (2) Pr, FeC, and FeB with a purity higher than 99% are packed in the crucible of the induction melting furnace, and the vacuum is evacuated so that the vacuum degree reaches 5×10 -2 Pa; then fill the cavity with high-purity argon to make the furnace pressure reach 70kPa. Power on; heat up to 1600°C to melt the sample, stop after 60 seconds of melting; repeat the melting 5 times, after the sample is completely cooled, take it out of the furnace for use;

[0043] (3) Break the ingot and put it into the quartz tube of the melt quenching furnace. The diameter of the nozzle at the bottom of the quartz tube is 1.5mm, and the bottom of the quartz tube is 4mm away from the copper roller; Vacuum, so that the vacuum degree reaches 9×10 -4 Pa; then f...

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
Coercivityaaaaaaaaaa
Coercivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a Pr-Fe-(C, B) rare earth permanent magnet material and a preparation method thereof, and relates to the technical field of permanent magnet materials, the Pr-Fe-(C, B) rare earth permanent magnet material comprises the following substances by atomic percent: Pr15Fe79 (C1-x, Bx) 6, and 0.2 < x < = 0.8; and the preparation technology comprises the steps of burdening, smelting, melt rapid quenching and annealing, melt rapid quenching is carried out in a protective atmosphere by adopting a vacuum rapid quenching furnace with the copper roller rotating speed V being larger than or equal to 30 m / s and smaller than or equal to 40 m / s, and annealing is carried out in an annealing furnace at the temperature of 600-950 DEG C in the protective atmosphere. According to the invention, the characteristics that the Nd2Fe14B phase is high in stability and the size of the B atom is similar to that of the C atom are utilized, and the C atom in Pr2Fe14C is partially replaced by the B atom, so that the stability of Pr2Fe14 (C, B) is greatly improved, the content of the Pr2Fe14 (C, B) phase is improved, and the coercive force is greatly improved.

Description

technical field [0001] The invention relates to the technical field of rare-earth permanent magnet materials, in particular to a Pr-Fe-(C, B) rare-earth permanent magnet material and a preparation method thereof, specifically, replacing C elements with B elements to increase the Pr-Fe-(C , B) Pr in rare earth permanent magnet materials 2 Fe 14 (C, B) stability and relative content to improve coercive force. Background technique [0002] Permanent magnetic materials are widely used in energy, transportation, aerospace, medical and other fields, and have broad application prospects. With the progress of society, the demand for permanent magnet materials is gradually increasing. This has led to the unbalanced utilization of rare earth resources and the scarcity of rare earth elements such as Nd, Tb, and Dy. PR 2 Fe 14 C permanent magnet material with Nd 2 Fe 14 B permanent magnet materials have the same tetragonal crystal structure and similar magnetic properties. with...

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
IPC IPC(8): H01F1/055H01F41/00
CPCH01F1/0557H01F1/0556H01F41/00
Inventor 岳明姚辉张红国刘卫强张东涛路清梅
Owner BEIJING UNIV OF TECH