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A method for high-throughput design of grain boundary diffuser composition in NdFeB magnets

A grain boundary diffusion, high-throughput technology, applied in magnetic properties measurement, hysteresis curve measurement, material analysis, etc., can solve the problems of high cost, low efficiency, cumbersome process, etc., and achieve high accuracy

Active Publication Date: 2021-06-18
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of extremely cumbersome process, low efficiency and high cost in the existing method of finding the best composition point in the diffusion medium of different systems, the present invention provides a high-throughput design of the composition of the grain boundary diffuser in the NdFeB magnet. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] To prepare the magnet to be diffused, cut the sintered NdFeB magnet into a cylinder with a diameter of 20mm and a height of 2mm, and the easy magnetization direction of the magnet is parallel to the axial direction of the cylinder. Put the diffused magnet after surface polishing and cleaning as the substrate for sputtering into high vacuum (the background pressure of the vacuum chamber is lower than 1×10 −3 Pa) on the sample tray inside the magnetron sputtering chamber, then the composition is Nd 80-x Dy x Al 20 (0o ) parameter, the preparation thickness is 4 micron composition is Nd 100-x Dy x (0o ), and finally through an experiment, high-throughput preparation of Nd with continuous gradient distribution 80-x Dy x Al 20 (0-3 Pa, then rush into argon and argon washing, repeat three times, and finally keep it below 5*10 -3 Pa vacuum. Then start heating, the first step is heating diffusion, the diffusion temperature is 900°C, the diffusion time is 4h, the heat...

Embodiment 2

[0046] To prepare the magnet to be diffused, cut the sintered NdFeB magnet into a cylinder with a diameter of 18mm and a height of 4mm, and the easy magnetization direction of the magnet is parallel to the axial direction of the cylinder. Put the diffused magnet after surface polishing and cleaning as the substrate for sputtering into high vacuum (the background pressure of the vacuum chamber is lower than 1×10 −3 Pa) on the sample tray inside the magnetron sputtering chamber, then the composition is Nd 100-x Cu x (0o ) parameter, the preparation thickness is 8 micron composition is Nd 100-x Cu x (0-3 Pa, then rush into argon and argon washing, repeat three times, and finally keep it below 5*10 -3 Pa vacuum. Then start heating, the first step is heating diffusion, the diffusion temperature is 850°C, the diffusion time is 6h, the heating rate is 10°C / min; the second step is cooling annealing, the cooling rate is 10°C / min, the annealing temperature is 550°C, The time is 2...

Embodiment 3

[0048] To prepare the magnet to be diffused, cut the sintered NdFeB magnet into a cylinder with a diameter of 18mm and a height of 4mm, and the easy magnetization direction of the magnet is parallel to the axial direction of the cylinder. Put the diffused magnet after surface polishing and cleaning as the substrate for sputtering into high vacuum (the background pressure of the vacuum chamber is lower than 1×10 −3 Pa) on the sample tray inside the magnetron sputtering chamber, then the composition is Nd 100-x Cu x (0o ) parameter, the preparation thickness is 8 micron composition is Nd 100-x Cu x (0-3 Pa, then rush into argon and argon washing, repeat three times, and finally keep it below 5*10 -3 Pa vacuum. Then start heating, the first step is heating diffusion, the diffusion temperature is 850°C, the diffusion time is 6h, the heating rate is 10°C / min; the second step is cooling annealing, the cooling rate is 10°C / min, the annealing temperature is 550°C, The time is 2...

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Abstract

This field relates to the field of rare earth permanent magnet materials. In order to solve the problems of extremely cumbersome process, low efficiency and high cost in the existing methods of finding the best composition point in different systems of diffusion media, the present invention provides a medium-high NdFeB magnet. Flux Design Method for Grain Boundary Diffuser Composition. The method comprises the following steps: 1) pretreatment: treating the magnet to obtain a magnet to be diffused; 2) magnetron sputtering: performing surface treatment on the magnet to be diffused and performing magnetron sputtering to prepare a diffusion medium film on the surface of the magnet, Obtain the coated magnet; 3) Composition detection: analyze the element distribution law and atomic ratio in each region of the diffusion medium film by energy spectrum; 4) heat treatment: perform heat treatment on the coated magnet, and obtain the sample to be tested after cooling; 5) Magnetic property detection: Test the magnetic properties of different parts of the surface of the sample to be tested; 6) analysis: combine the component test results and the magnetic property test results to obtain the best component ratio. Has the advantage of high efficiency.

Description

technical field [0001] This field relates to the field of rare earth permanent magnet materials, in particular to a method for high-throughput design of the composition of grain boundary diffusers in NdFeB magnets. Background technique [0002] Rare earth permanent magnet materials are key functional materials for the development of emerging industries and the implementation of "Made in China 2025", and are widely used in new energy, smart equipment, rail transit, electronic information and other fields. At present, NdFeB magnets occupy a dominant position in rare earth permanent magnet materials. Due to its outstanding magnetic properties, NdFeB permanent magnet materials are widely used in many industries and high-tech fields in today's society. With the continuous expansion of new application fields represented by hybrid vehicles and wind power generation, its magnetic properties, The requirements for comprehensive performance such as thermal stability and corrosion resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2251G01N23/20091G01R33/14H01F41/02C23C14/58C23C14/35
CPCC23C14/35C23C14/5806G01N23/20091G01N23/2251G01N2223/09G01N2223/102G01R33/14H01F41/0253H01F41/0293
Inventor 赵利忠郝志鹏赵晓宇李领伟
Owner HANGZHOU DIANZI UNIV