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

Double-high-temperature sintering process for yttrium-added sintered neodymium iron boron

A high-temperature sintering, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, electrical components, etc., can solve the problems of no obvious progress in application development technology, inability to solve migration segregation, lack of grain boundary phases, etc. Achieve the effect of obvious material processability, improved material processability, and increased coercivity

Inactive Publication Date: 2021-10-29
中稀依诺威(山东)磁性材料有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, the technology of using high-abundance and low-cost rare earth elements La and Ce to replace low-grade sintered NdFeB has gradually matured, but the application and development technology of the same high-abundance and low-cost yttrium in NdFeB There is no significant progress at home and abroad
Mainly: it cannot solve the problems of grain adhesion, grain boundary phase loss and segregation caused by the strong migration and segregation behavior of rare earth yttrium element in the process of NdFeB ternary phase combination

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
  • Double-high-temperature sintering process for yttrium-added sintered neodymium iron boron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Including the following steps:

[0020] Step 1: Place the sintered NdFeB green body in the sintering furnace. After vacuuming, heat up from room temperature to the first temperature of 300°C after 40 minutes of heating time, and keep it warm for 30 minutes. After vacuuming, the vacuum degree in the sintering furnace is less than or equal to 0.1Mpa; During the heating and constant temperature process, the water vapor and organic matter contained in the NdFeB magnet green body during the firing process are discharged; then continue to heat up, and the treated NdFeB magnet will heat up after 100 minutes of heating time To the second temperature of 700°C, keep warm for 200 minutes;

[0021] Step 2: After the heat preservation in step 1 is completed, after a heating time of 60 minutes, the temperature is raised to 1050°C and held for 2.5 hours. At 1050°C, a large number of neodymium-rich phases in the NdFeB magnet appear, the main phase particles recombine, and large-sized p...

Embodiment 2

[0027] The difference from Example 1 is that the first temperature can be raised to 400°C and kept for 10 minutes; the second temperature can be raised to 900°C and kept for 100 minutes; in step 2, the temperature can be raised to 1100°C and kept for 2 hours; step 3 In step 4, it can be cooled to 900° C.; in step 4, it can be heated to 1100° C. and kept for 1 hour. Other steps are the same as in Example 1.

Embodiment 3

[0029] The difference from Example 1 is that the first temperature can be raised to 200°C and kept for 60 minutes; the second temperature can be raised to 600°C and kept for 300 minutes; in step 2, the temperature can be raised to 1020°C and kept for 3 hours; step 3 In step 4, it can be cooled to 600°C; in step 4, it can be heated to 1020°C and kept for 3 hours. Other steps are the same as in Example 1.

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
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a double-high-temperature sintering process for yttrium-added sintered neodymium-iron-boron, which is characterized in that the sintered neodymium-iron-boron is heated and insulated for multiple times, and is subjected to the steps of high-temperature treatment, cooling, high-temperature treatment, cooling and the like to finally obtain a yttrium-added sintered neodymium-iron-boron magnet, and the yttrium-added sintered neodymium-iron-boron magnet is designed for the yttrium-added sintered neodymium-iron-boron under the condition of not increasing new procedures and equipment. The problem that the coercive force of the magnet is sharply reduced due to the fact that the yttrium element is extremely prone to segregation in the neodymium iron boron main phase after high-temperature long-time heat preservation is effectively solved. And compared with one-time high-temperature sintering, the coercive force can be improved; meanwhile, the material machinability is obviously improved, and the finish machining qualification rate is increased.

Description

technical field [0001] The invention relates to the field of heat treatment of sintered NdFeB, in particular to a double high-temperature sintering process for sintered NdFeB with yttrium addition. Background technique [0002] Neodymium iron boron (NdFeB) is a third-generation rare earth permanent magnet material, which has the characteristics of small size, light weight and strong magnetism. It is known as the magnet king in the field of magnetism. As the third generation permanent magnet material, NdFeB rare earth permanent magnet is There is currently no irreplaceable permanent magnet material with the highest magnetic performance. It is the basic material of the electromechanical industry and the information industry, and is also one of the key industrial projects supported by the country's new material field. The products are widely used in national defense, electric power, machinery, metallurgy, and transportation. , communications, home appliances and other fields. ...

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): H01F41/02H01F1/057
CPCH01F41/0253H01F1/0577
Inventor 张亚波李波王春红
Owner 中稀依诺威(山东)磁性材料有限公司