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

Method for preparing nano crystal NdFcB anisotropic magnetic powder

An anisotropic magnetic and nanocrystalline technology, which is applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of complex process, high production cost, inability to prepare nanocrystalline anisotropic magnetic powder, etc., and achieves a simple process. , low cost, small grain size effect

Inactive Publication Date: 2009-04-29
常熟市浩泰金属新材料科技有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing HDDR process cannot prepare nanocrystalline anisotropic magnetic powder, and the process of rapid quenching-thermal deformation method is complicated, the production cost is high, and it is difficult to push it to practical application, and to provide a method for preparing nanocrystalline NdFeB Anisotropic Magnetic Powder Method

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

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific Embodiment 1: In this embodiment, nanocrystalline NdFeB anisotropic magnetic powder is prepared according to the following steps: a. Use mechanical method or hydrogen explosion method to crush NdFeB as-cast alloy into coarse powder with a particle size of 0.5-1 mm; b. The powder is subjected to high-energy ball milling at room temperature and hydrogen atmosphere for 10-30 hours to realize hydrogenation-disproportionation and obtain a disproportionated phase NdH with a grain size of less than 10nm 2±χ , α-Fe and Fe 2 Disproportionated NdFeB alloy powder composed of B; c. After compacting the disproportionated NdFeB alloy powder, perform upsetting deformation at 20-400°C to make the α-Fe matrix produce a deformed texture; d. Deform the blank at 500 Dehydrogenation-recombination treatment at ~800°C transforms the nanodisproportionated structure into nanocrystalline Nd with preferred crystal orientation 2 Fe 14 B structure; e, the material after dehydrogenation-r...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that in step a, the NdFeB as-cast alloy is crushed into a particle size of 0.5-1 mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step a, the NdFeB as-cast alloy is Nd 12 Fe 82 B 6 、Nd 8 Fe 86 B 6 、Nd 2 Fe 14 B N 16 Fe 76 B 8 、Nd 12.2 Fe 81.8 B 6 、Nd 12.2 Fe 80.8 Ga 1 B 6 、Nd 12.2 Fe 64.3 CO 17.5 B 6 or Nd 14 Fe 66.9 co 11 B 7 Zr 0.1 Ga 1 alloy. Others are the same as in the first embodiment.

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 diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

This invention relates to a method for preparing nm crystal NdFeB anisotropic magnetic powder including the following steps: a, crashing NdFeB cast-state alloy to rough powder, b, carrying out high energy grinding to the rough powder under room temperature and hydrogen atmosphere to realize hydrogenation-dismutation, c, carrying out forge deformation, d, dehydrogenizing the deformed ingots-recombining them, e, carrying out mechanical crushing to the processed material to get a nm crystal NdFeB magnet.

Description

technical field [0001] The invention relates to a method for preparing anisotropic magnetic powder. technical background [0002] Rare earth bonded magnets are mainly made of rare earth permanent magnet alloy powder and binder. Compared with the production process of sintered magnets, the bonded magnet process has many advantages, such as high dimensional accuracy, no deformation, no secondary processing; large degree of freedom in shape, and can produce magnets with complex shapes; easy multi-pole magnetization, etc. , so bonded magnets have been widely used in computer, automation, transportation and household appliances and other fields. To obtain high-performance bonded magnets, high-performance bonded magnetic powder is necessary, but the widely used bonded NdFeB magnetic powder is an isotropic material, and its theoretical magnetic energy product is only 1 of the corresponding anisotropic material. / 4. Therefore, it is one of the current research hotspots of rare ea...

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): H01F1/057H01F1/06C04B35/622
Inventor 胡连喜李玉平袁媛王尔德刘祖岩
Owner 常熟市浩泰金属新材料科技有限公司