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Method for preparing Nd-Fe-B alloys by using waste

A neodymium-iron-boron and alloy technology is applied in the field of using waste to prepare neodymium-iron-boron alloy, which can solve the problems of high process requirements, high cost and high scrap rate, and achieves reduction of raw material cost, improvement of material utilization rate, high production and utilization value and comprehensive The effect of social benefit

Inactive Publication Date: 2005-10-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The highest N33SH magnet can be made by this method, but N33SH is still a low-end product in the market
In the preparation process of NdFeB materials with medium and high coercive force and low temperature coefficient, the process requirements are high; the cost and scrap rate are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 35SH products are produced from 32EH waste.

[0020] Take 32EH waste material, its atomic percentage composition is: 11.03Nd2.5Dy5.0Co6.15B0.05Cu1.0Nb and the rest is Fe and other impurities (0.35O, 0.058N, 0.05C, etc.).

[0021] Select the alloy composition: 12.50Nd1.5Dy78.62Fe6.15B0.05Cu0.3Nb.

[0022] The two are batched in a ratio of 2:8, melted in a vacuum intermediate frequency induction furnace under the protection of high-purity argon, and produced alloy ingots through a cooler. Under the protection of high-purity nitrogen, crushing and fine grinding are carried out to obtain NdFeB alloy powder with an average particle size of 4.5 μm. The alloy powder is mixed for 2 hours after adding a small amount of antioxidant and lubricant, and then pressed evenly. The pressing pressure is 5.2 MPa, and then subjected to 200 MPa isostatic pressing to obtain a green compact. In the sintering furnace at 1110°C for 2 hours, primary heat treatment at 880°C for 2 hours, second...

example 2

[0026] 35SH products are produced from 35SH waste.

[0027] Take 35SH waste material, its atomic percentage composition is: 12.55Nd1.5Dy1.0Co6.24B0.2Cu1.0Nb, the rest is Fe and other impurities (0.35O, 0.058N, 0.10C, etc.).

[0028] Select the alloy composition: 12.85Nd1.6Dy1.0Co6.24B0.2Cu1.0Nb and the rest is Fe.

[0029] The two are batched at a ratio of 3:7, melted in a vacuum intermediate frequency induction furnace under the protection of high-purity argon, and produced alloy ingots through a cooler. Under the protection of high-purity nitrogen, crushing and fine grinding are carried out to obtain NdFeB alloy powder with an average particle size of 4.5 μm. The alloy powder is mixed for 2 hours after adding a small amount of antioxidant and lubricant, and then pressed evenly. The pressing pressure is 5.2 MPa, and then subjected to 200 MPa isostatic pressing to obtain a green compact. In the sintering furnace at 1110°C for 2 hours, primary heat treatment at 880°C for 2 h...

example 3

[0033] 32EH products are produced from 32EH waste.

[0034] Get 32EH waste material, its atomic percentage basic composition is:

[0035] 11.03Nd2.5Dy5.0Co6.15B0.05Cu1.0Nb and the rest are Fe and other impurities (0.35O, 0.058N, 0.05C, etc.).

[0036] Select the alloy composition: 11.53Nd2.5Dy4.0Co6.15B0.05Cu1.0Nb and the rest is Fe.

[0037]The two are batched in a ratio of 2:8, melted in a vacuum intermediate frequency induction furnace under the protection of high-purity argon, and produced alloy ingots through a cooler. Under the protection of high-purity nitrogen, crushing and fine grinding are carried out to obtain NdFeB alloy powder with an average particle size of 4.5 μm. The alloy powder is mixed for 2 hours after adding a small amount of anti-oxidant nutrient and lubricant, and then pressed evenly. The pressing pressure is 5.2 MPa, and then subjected to 200 MPa isostatic pressing to obtain a green compact. In the sintering furnace at 1110°C for 2 hours, primary h...

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Abstract

A method of preparing alloy which contains neodymium iron boron by scraps, which relates to a preparation of permanent magnet of neodymium iron boron, especially by using the raw materials of scraps of neodymium iron boron alloy which own middle or high coercive force to prepare the permanent magnet of neodymium iron boron.. The characteristics is that the alloy contains 20 - 50% of the raw materials. Determine the chemic component of the scraps to confirm its constitution. Supplement pure materials of alloy by frame of reference. Enter 0.2 - 0.5% more Nb and 0.5 - 1.0% more Nd by frame of reference after the supplement of the weights which lost in sinter. The method of the present convention can callback 95 - 99% of scraps effectively, and reduce 8 - 10% of the cost of the raw materials. Increase the rate of the utilization of the stuff. The invention can produce large amount of neodymium iron boron production which contains high trademark steadily. It has the high value of production and utilization, and also have the integrative benefit of the society.

Description

technical field [0001] The invention discloses a method for preparing NdFeB alloys from waste materials, and relates to a method for preparing NdFeB permanent magnet materials, in particular to a method for preparing NdFeB permanent magnet materials by using NdFeB alloy waste materials with medium and high coercivity as raw materials. Background technique [0002] In the industrial production of NdFeB magnetic materials, its production process has been relatively mature. However, due to the many and complicated processes and the limitation of the yield, about 20% to 35% of waste will be generated in the process of the final product. If it is not used effectively, take 35SH and 32EH as examples, these scraps can only be sold at a very low price. The price of these waste materials is generally only about 1 / 10 of the cost of the same material produced, which greatly increases the final production cost of NdFeB products. [0003] Among the existing technologies, such as Chines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00
Inventor 孙明炜罗建军贺新杰谈萍孙杏囡张晗亮吝靖玉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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