Treatment method of smelted neodymium-iron-boron alloy sheet

A processing method and alloy sheet technology, which can be applied to the improvement of process efficiency, manufacturing of inductors/transformers/magnets, magnetic objects, etc., can solve the problems that NdFeB alloy sheets cannot be directly exposed to the air, shorten the process time, improve The effect of discharging efficiency and reducing oxidation activity

Active Publication Date: 2020-09-18
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the NdFeB alloy sheets in the prior art cannot be directly exposed to the air. Therefore, the present invention provides a treatment method for the smelted NdFeB alloy sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An anti-oxidation process for preparing sintered NdFeB alloy sheets, comprising the following steps:

[0037] a. Ingredients: praseodymium and neodymium 31wt.% (the ratio of praseodymium and neodymium is 25:75), copper 0.15%, aluminum 0.65wt.%, cobalt 1wt.%, niobium 0.2wt.%, gallium 0.2wt.%, boron 0.95 wt.%, the rest is iron, put into the crucible;

[0038] b. Melting: leak detection through vacuuming, vacuuming: vacuumize the furnace to make the vacuum degree reach 15-18Pa, oven: heat and continue to vacuumize to 8- 9Pa.

[0039] Stop baking and fill with argon: fill the furnace with high-purity argon gas with a purity ≥ 99.99%, and stop argon filling after the gas pressure in the furnace reaches 50kPa

[0040] Melting per liter of power: through induction heating, all solid raw materials are melted into a liquid state

[0041] Refining: Continue to heat and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy...

Embodiment 2

[0050] a. Ingredients: praseodymium and neodymium 31wt.% (the ratio of praseodymium and neodymium is 25:75), copper 0.15%, aluminum 0.65wt.%, cobalt 1wt.%, niobium 0.2wt.%, gallium 0.2wt.%, Boron 0.95wt.%, the rest is iron, put into the crucible;

[0051] b. Melting: leak detection through vacuuming, vacuuming: vacuumize the furnace to make the vacuum degree reach 15-18Pa, oven: heat and continue to vacuumize to 8- 9Pa.

[0052] Stop baking and fill with argon: Fill the furnace with high-purity argon gas with a purity of ≤99.99%, so that the gas pressure in the furnace reaches 50kPa and then stop argon filling

[0053] Melting per liter of power: through induction heating, all solid raw materials are melted into a liquid state

[0054]Refining: Continue to heat and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy liquid to 1500°C

[0055] Stand for cooling: adjust to the appropriate heating power, keep the alloy l...

Embodiment 3

[0077] a. Ingredients: praseodymium and neodymium 31wt.% (the ratio of praseodymium and neodymium is 25:75), copper 0.15%, aluminum 0.65wt.%, cobalt 1wt.%, niobium 0.2wt.%, gallium 0.2wt.%, Boron 0.95wt.%, the rest is iron, put into the crucible;

[0078] b. Melting: leak detection through vacuuming, vacuuming: vacuumize the furnace to make the vacuum degree reach 15-18Pa, oven: heat and continue to vacuumize to 8- 9Pa.

[0079] Stop baking and fill with argon: Fill the furnace with high-purity argon gas with a purity of ≤99.99%, so that the gas pressure in the furnace reaches 50kPa and then stop argon filling

[0080] Melting per liter of power: through induction heating, all solid raw materials are melted into a liquid state

[0081] Refining: Continue to heat and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy liquid to 1500°C

[0082] Stand for cooling: adjust to the appropriate heating power, keep the alloy ...

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Abstract

The invention discloses a treatment method of a smelted neodymium-iron-boron alloy sheet. The method comprises the steps that a smelted neodymium-iron-boron alloy sheet is placed in hydrogen-argon mixed gas; the temperature of the smelted neodymium-iron-boron alloy sheet is 400 to 550 DEG C; and in the hydrogen-argon mixed gas, the volume ratio of hydrogen is 5% to 80%. According to the treatmentmethod for the smelted neodymium-iron-boron alloy sheet, the discharging efficiency of the alloy sheet can be effectively improved, and the hydrogen decrepitation process time is shortened; and the alloy sheet is not easy to oxidize in air.

Description

technical field [0001] The invention relates to a treatment method of smelted neodymium-iron-boron alloy sheets. Background technique [0002] Sintered NdFeB magnet is currently the strongest permanent magnet material, and it is widely used in energy, transportation, machinery, medical, computer, home appliances and other fields. In actual production, the oxygen content in the NdFeB alloy sheet has a great influence on the magnetic properties. The current methods reduce the oxygen content by adding alloy additives and other means, but there are generally disadvantages such as poor anti-oxidation effect and difficult storage. [0003] CN109935463A discloses a method for reducing the oxygen content of NdFeB alloy sheets by adding additives with higher oxophilicity than iron, such as silicon-manganese alloys, during smelting. However, these additives will cause the impurity components in the NdFeB alloy sheet to be higher than the design value and affect the performance desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F9/02C22C38/16C22C38/06C22C38/10C22C38/12
CPCH01F41/026H01F1/057B22F9/023C22C38/005C22C38/16C22C38/06C22C38/10C22C38/12C22C38/002Y02P10/20
Inventor 黄杰华孔维峰李智翔兰文辉
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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