Preparation method of neodymium-iron-boron alloy sheet

An alloy flake, NdFeB technology, applied in inductor/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problems of easy deviation from design components, poor product stability, poor repeatability, etc., to achieve product stability Good, less fine crystal content, good remanence effect

Inactive Publication Date: 2016-11-09
GANZHOU FORTUNE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the preparation method of NdFeB alloy quick-cooling thick belt is as follows: a certain proportion of NdFeB alloy melt is passed through a rotating water-cooled metal wheel (such as a copper wheel or a molybdenum wheel) to form a quick-cooling thick belt, and the magnet obtained has High magnetic energy product and coercive force, but the actual composition of the alloy is easy to deviate from the design composition, resulting in poor product stability and poor repeatability

Method used

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  • Preparation method of neodymium-iron-boron alloy sheet
  • Preparation method of neodymium-iron-boron alloy sheet
  • Preparation method of neodymium-iron-boron alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Charge: 380.65g (67.47wt%) pure iron, 0.91g (0.15wt%) zirconium, 3.61g (1wt%) cobalt, 30.08g (0.98wt%) boron iron, 0.60g (0.1wt%) ) Copper, 1.20g (0.20wt%) aluminum, 182.37g (30wt%) praseodymium neodymium alloy, 0.60g (0.1wt%) gallium raw materials are loaded into corundum crucibles from bottom to top, and fixed in a vacuum quick-setting furnace , close the furnace door;

[0037] (2) Vacuuming: Vacuumize the furnace to make the vacuum degree in the furnace reach 5Pa, and continue to heat and evacuate to 1Pa under the premise that the raw materials will not be heated to red;

[0038] (3) Argon filling: Fill the furnace with high-purity argon gas with a purity ≥ 99.99%, so that the pressure in the furnace reaches 50kPa and then stop argon filling;

[0039] (4) Melting: All the solid raw materials are melted into liquid state by induction heating, and the last piece of NdPr falls below the liquid level of the alloy through the observation window;

[0040] (5) Refinin...

Embodiment 2

[0048] (1) Charge: 380.65g (67.47wt%) pure iron, 0.91g (0.15wt%) zirconium, 3.61g (1wt%) cobalt, 30.08g (0.98wt%) boron iron, 0.60g (0.1wt%) ) copper, 1.20g (0.20wt%) aluminum, 182.37g (30wt%) praseodymium neodymium alloy, 0.60g (0.1wt%) gallium raw materials are loaded into corundum crucibles from bottom to top, and the crucibles are fixed in the vacuum quick-setting furnace. close the furnace door;

[0049] (2) Vacuuming: Vacuumize the furnace to make the vacuum degree in the furnace reach 5.5Pa, then heat and continue to evacuate to 1.5Pa under the premise that the raw materials will not be heated to red;

[0050] (3) Argon filling: Fill the furnace with high-purity argon gas with a purity ≥ 99.99%, so that the pressure in the furnace reaches 50kPa and then stop argon filling;

[0051] (4) Melting: All the solid raw materials are melted into a liquid state through induction heating, and the last piece of NdPr falls below the liquid level of the alloy through the observatio...

Embodiment 3

[0060] (1) Charge: 380.65g (67.47wt%) pure iron, 0.91g (0.15wt%) zirconium, 3.61g (1wt%) cobalt, 30.08g (0.98wt%) boron iron, 0.60g (0.1wt%) ) copper, 1.20g (0.20wt%) aluminum, 182.37g (30wt%) praseodymium neodymium alloy, 0.60g (0.1wt%) gallium raw materials are loaded into corundum crucibles from bottom to top, and the crucibles are fixed in the vacuum quick-setting furnace. close the furnace door;

[0061] (2) Vacuuming: Vacuumize the furnace to make the vacuum degree in the furnace reach 6Pa, and continue to heat and evacuate to 2Pa under the premise that the raw materials will not be heated to red;

[0062] (3) Argon filling: Fill the furnace with high-purity argon gas with a purity ≥ 99.99%, so that the pressure in the furnace reaches 50kPa and then stop argon filling;

[0063] (4) Melting: All the solid raw materials are melted into a liquid state through induction heating, and the last piece of NdPr falls below the liquid level of the alloy through the observation win...

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Abstract

The invention provides a preparation method of a neodymium-iron-boron alloy sheet. The preparation method comprises the steps of loading, vacuumizing, filling with argon, melting, refining, insulating heat at a high temperature for deslagging, reducing temperature, casting, cooling and tapping. The obtained alloy sheet has a thickness of 0.2 to 0.4mm, a ratio higher than 98 percent and oxygen content lower than 60ppm; it can be seen from a section metallographic diagram that a proportion of fine grains is less, the penetrability of columnar crystal is good, intrinsic coercivity and squareness of a produced magnet are greatly increased while better remanence and magnetic energy product are kept, and the overall performance is better. Meanwhile, according to the preparation method of the neodymium-iron-boron alloy sheet, contents of various components in a product are small in deviation from design proportions, and the product is good in stability, perfect in repeatability and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of neodymium-iron-boron alloy preparation, and in particular relates to a preparation method of neodymium-iron-boron alloy flakes. Background technique [0002] NdFeB permanent magnet materials, of which Nd 2 Fe 14 Phase B accounts for more than 90% of the total volume, and the others are neodymium-rich phase, boron-rich phase and rare earth oxides such as Nd 2 o 3 Wait. NdFeB permanent magnet material is also known as "magnet king". As the third generation rare earth permanent magnet material, it has attracted great attention and its application fields are becoming more and more extensive. At present, with the popularization and application of the vacuum quick-setting process in the NdFeB permanent magnet material manufacturing industry, the quality of the alloy flakes has become more and more important to the performance of the NdFeB magnet. By optimizing and perfecting the preparation process of NdFe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22D11/06
CPCH01F1/0576B22D11/06H01F41/0253
Inventor 戚植奇杜君峰喻玺徐根平刘滨
Owner GANZHOU FORTUNE ELECTRONICS
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