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Preparation method of copper-tin grain boundary modified anti-corrosion sintered NdFeB magnet

A grain boundary modification, NdFeB technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of polluting the environment, increasing production processes and costs, environmental protection problems, etc., and reducing sintering. and heat treatment temperature, high corrosion resistance, the effect of reducing production cost

Active Publication Date: 2017-09-26
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the aforementioned methods can improve the properties of the NdFeB grain boundary phase to a certain extent, adjust the intergranular distribution of the Nd-rich phase, and improve the corrosion resistance of the magnet; however, the improvement in the corrosion resistance of the magnet is limited and difficult to meet Due to the requirements of high-end fields, people have to use electroplating, electrophoresis or chemical plating to treat or protect the surface of magnets.
It should be pointed out that the surface protection of NdFeB will not only increase the production process and cost, but also pollute the environment and cause environmental problems

Method used

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  • Preparation method of copper-tin grain boundary modified anti-corrosion sintered NdFeB magnet
  • Preparation method of copper-tin grain boundary modified anti-corrosion sintered NdFeB magnet

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main alloy Nd 10.45 PR 1.95 Dy 1.0 Fe 79.1 co 1.6 B 5.9 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting, and carry out quick-setting flakes through copper rollers (surface line speed 1.6m / s), to obtain 0.2-0.30mm thick flakes; auxiliary alloy Cu 80.0 sn 20.0 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the raw materials are melted to prepare auxiliary alloy ingots.

[0032] (2) Pulverization: the main alloy and the auxiliary alloy are pulverized separately, and the main alloy Nd 10.45 PR 1.95 Dy 1.0 Fe 79.1 co 1.6 B 5.9 The quick-setting flakes, after the hyd...

Embodiment 2

[0045] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main alloy Nd 11.2 PR 2.5 Dy 1.0 Fe 78.3 co 1.0 B 6.0 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting, and carry out quick-setting flakes through copper rollers (surface line speed 1.8m / s), to obtain flakes with a thickness of 0.2-0.3mm; auxiliary alloy Cu 54.5 sn 45.5 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the materials are melted to prepare auxiliary alloy ingots.

[0046] (2) Pulverization: the main alloy and the auxiliary alloy are pulverized separately, and the main alloy Nd 11.2 PR 2.5 Dy 1.0 Fe 78.3 co 1.0 B 6.0 Quick-setting flakes, and then coa...

Embodiment 3

[0057] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main alloy Nd 9.5 PR 2.8 Ho 2.5 Fe 77.1 co 2.0 B 6.1 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10-3 After Pa, start heating and smelting, and carry out quick-setting flakes through copper rollers (surface line speed 2.0 m / s), to obtain 0.2-0.35mm thick flakes; auxiliary alloy Cu 85.0 sn 15.0 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the materials are melted to prepare auxiliary alloy ingots.

[0058] (2) Pulverization: the main alloy and the auxiliary alloy are pulverized separately, and the main alloy Nd 9.5 PR 2.8 Ho 2.5 Fe 77.1 co 2.0 B 6.1 The quick-setting flakes, after the hydrogen explo...

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Abstract

The invention discloses a copper-tin grain boundary modified anti-corrosion sintered NdFeB magnet and a preparation process thereof. The general formula of the copper-tin grain boundary modified corrosion-resistant sintered NdFeB magnet is (RExFe100‑x‑y‑zCoyBz)100‑v(Cu100‑uSnu)v. The beneficial effect of the present invention is: compared with the magnet without copper-tin alloy grain boundary modification, the prepared magnet has higher corrosion resistance; The grain boundary modification of the copper-tin alloy reduces the temperature of sintering and heat treatment, which can save a lot of energy and reduce the production cost of materials.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a copper-tin grain boundary modified corrosion-resistant sintered NdFeB magnet with low weight loss and acid corrosion resistance and a preparation process thereof. Background technique [0002] Sintered neodymium-iron-boron (NdFeB) is a metal permanent magnet material mainly developed during China's "Twelfth Five-Year Plan" period. It has the advantages of high remanence, high energy product, high coercivity and low expansion coefficient, and can be made into various forms. Functional devices that convert electromagnetic energy to mechanical energy are widely used in energy transportation, electrical engineering, communication, medical engineering, office automation and other fields. Remanence of NdFeB B r , the maximum magnetic energy product (BH) max and intrinsic coercivity i H c The theoretical values ​​are as high as 1.6 T, 63 MGOe, and 75 kOe resp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/16
Inventor 倪俊杰王文宏贾正锋王长征马杰李伟
Owner LIAOCHENG UNIV