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

A kind of neodymium iron boron bar and its pulse magnetization process

A technology of NdFeB and pyrophosphate titanate, which is applied in the fields of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., and can solve the problems affecting the magnetism of NdFeB magnets and the reduction of the density of NdFeB magnets, etc. problem, to achieve good intrinsic coercive force, inhibition of reaction, and good mechanical strength

Active Publication Date: 2022-03-22
宁波市镇海兴强磁性材料有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the addition of binder, the density of NdFeB magnets decreases, and the intrinsic coercive force and residual magnetic induction intensity also decrease, which affects the magnetic properties of NdFeB magnets. Therefore, in the manufacturing process of NdFeB magnets , under the premise of ensuring that a complete magnet with certain mechanical properties is obtained, the content of binder in the magnet should be reduced as much as possible

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

preparation example 1

[0046] Preparation of pyrophosphate titanate coupling agent modified NdFeB powder:

[0047] S1, weigh 10 kg of bis(dioctyloxypyrophosphate) ethylene titanate coupling agent, stir and dissolve it in 10 kg of ethanol to obtain a mixed solution A;

[0048] S2, Weigh 100kg of NdFeB powder and 42kg of ethanol, stir and mix evenly, raise the temperature to 70°C, add the mixed solution A prepared in step S1, stir and react at constant temperature for 2h, stop heating, let stand to separate layers, remove the lower layer of solid, and use acetone Washing three times and drying in vacuum to obtain pyrophosphate-type titanate coupling agent-modified NdFeB powder.

preparation example 2

[0050] Preparation of pyrophosphate titanate coupling agent modified NdFeB powder:

[0051] The difference from Preparation Example 1 is that 0.8 kg of monoglyceride laurate is added in step S1.

preparation example 3

[0053] Compared with the preparation of NdFeB powder:

[0054] The difference from Preparation Example 1 is that the titanate coupling agent sold by Nanjing Feiteng Chemical Co., Ltd. replaces the bis(dioctyloxypyrophosphate) ethylene titanate coupling agent in an equal amount to obtain a comparison NdFeB powder .

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
epoxy equivalentaaaaaaaaaa
epoxy equivalentaaaaaaaaaa
epoxy equivalentaaaaaaaaaa
Login to View More

Abstract

This application relates to the field of rare earth permanent magnets, and specifically discloses a neodymium-iron-boron bar, including the following raw materials: pyrophosphate-type titanate coupling agent modified neodymium-iron-boron powder; epoxy resin binder; thermosetting agent . A pulse magnetization process for NdFeB strips, comprising the following steps: S1, weighing pyrophosphate-type titanate coupling agent modified NdFeB powder, epoxy resin binder and The thermal curing agent is stirred and mixed evenly to obtain a mixture; S2, the mixture obtained in the step S1 is pre-magnetized in a pulsed magnetic field, and then magnetized by an orientation pulse, pressed and cured at a temperature of 160-170°C to obtain a finished product. Pyrophosphate titanate coupling agent is used to modify NdFeB powder, so that the iron-boron strip has better mechanical strength, better coercive force and remanent magnetism. Choose an epoxy resin binder with an epoxy equivalent of 500‑850g / eq to ensure the density and compressive strength of the NdFeB strip.

Description

technical field [0001] This application relates to the field of rare earth permanent magnets, more specifically, it relates to a neodymium iron boron strip and its pulse magnetization process. Background technique [0002] The magnetic energy product of NdFeB permanent magnets is between 27-50MGOe, known as the "Permanent Magnet King", and it is currently the most magnetic permanent magnet material. [0003] With the continuous expansion of the application field of NdFeB magnets, higher requirements are put forward for the magnetization of high-end rare earth permanent magnet materials NdFeB. The magnetization field strength required to meet the saturation magnetization of NdFeB magnets is about 3-5 times the force. Due to the high current intensity and short time of pulse magnetization, the conversion of electromagnetic energy can saturate and magnetize ultra-high intrinsic coercivity permanent magnets. Therefore, pulse magnetization replaces traditional electromagnet cons...

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): H01F1/057H01F13/00H01F41/02
CPCH01F1/0572H01F1/0578H01F13/003H01F41/0266
Inventor 梁光森章成辉
Owner 宁波市镇海兴强磁性材料有限公司