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Method for producing high puriy, laminar cast ingot of Nd-Fe-B alloys

A technology of alloy ingot casting and production method, which is applied in the direction of magnetic materials, electrical components, circuits, etc., can solve the problems affecting the performance of NdFeB alloys, coarse grains, composition inclusions, etc., and achieve grain refinement, ingot density increase, Effect of component segregation suppression

Inactive Publication Date: 2005-01-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing NdFeB alloy ingots are columnar, and the ingots are prone to casting defects such as composition inclusions, shrinkage porosity, segregation, and coarse grains, which affect the performance of NdFeB alloys

Method used

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  • Method for producing high puriy, laminar cast ingot of Nd-Fe-B alloys
  • Method for producing high puriy, laminar cast ingot of Nd-Fe-B alloys
  • Method for producing high puriy, laminar cast ingot of Nd-Fe-B alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of this embodiment is Nd 10.5 Fe 76.4 co 5 Zr 2 B 6.1 alloy ingot, the process steps are as follows:

[0029] (1) Ingredients

[0030] Industrial pure iron 53.5%

[0031] Boron iron (19.53% boron content) 29.0%

[0032] Neodymium Metal 10.5%

[0033] Cobalt Metal 5%

[0034] Sponge metal zirconium 2%

[0035] The above are percentages by weight.

[0036] (2) Melting

[0037] The melting equipment is a 20kg vacuum melting furnace. Put the NdFeB alloy material into the crucible, hang the calcium-magnesium alloy above the crucible, and seal the furnace body to draw a vacuum. When the vacuum reaches 8×10 -2 Pa, fill it with argon to 0.05Mpa, and then start smelting, and the temperature is controlled at about 1500°C during smelting. After each component of NdFeB alloy is fully melted, add calcium-magnesium alloy to purify the melt, the addition of calcium-magnesium alloy is 0.2% (percentage by weight) of the total amount of each component in the...

Embodiment 2

[0059] This embodiment makes Nd 32.8 Fe 66.1 B 1.1 Alloy ingot, the process steps are as follows:

[0060] (1) Ingredients

[0061] Industrial pure iron 38.2%

[0062] Boron iron (19.53% boron content) 29.0%

[0063] Neodymium Metal 32.8%

[0064] The above are percentages by weight.

[0065] (2) Melting

[0066] The smelting equipment is a 20kg vacuum smelting furnace. The smelting process parameters and operation are the same as in Example 1. After the components of the NdFeB alloy are fully melted, metal calcium is added to purify the melt. 0.5% (percentage by weight) of the total amount. The specific operation is: suspend the calcium metal block above the crucible, and after the components of the NdFeB alloy are fully melted, manipulate the handle of the crucible to raise the crucible so that the calcium metal is melted in the alloy liquid.

[0067] (3) Pouring

[0068] The ingot mold is made of copper, and its size is 180mm×150mm×30mm. Both sides of the ingot mol...

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Abstract

A process method for a thin plate NdFeB ingot characterizes in purifying the NaFeB melt and controlling the cooling speed of the ingot after casting, in which, the purification is to add Ca and its alloy and let the melt pass through a pouring cup with a mini-hole foam ceramic filter plate to enter into the mold and the control of the cooling speed is realized by using a flat mold made of Cu and its alloy attached by two water cooling cover dies at its both sides to greatly reduce impurities in the ingot and refine the grains so as to improve the structure and increase the rate of finished products.

Description

technical field [0001] The invention belongs to a method for making a metal ingot, in particular to a method for making a magnetic material neodymium-iron-boron (NdFeB) alloy ingot. Background technique [0002] Neodymium iron boron (NdFeB) permanent magnet materials are more and more widely used, but whether it is quenched bonded NdFeB permanent magnet or sintered NdFeB permanent magnet, it must be smelted and poured to form an ingot before other processing. Most of the existing NdFeB alloy ingots are columnar, and the ingots are prone to casting defects such as composition inclusions, shrinkage porosity, segregation, and coarse grains, which affect the performance of NdFeB alloys. Therefore, research on methods to improve the intrinsic quality and purity of NdFeB melt and reduce the segregation of ingot components has attracted much attention. Contents of the invention [0003] The purpose of the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00C22C33/04C22C38/00H01F1/057
Inventor 刘颖涂铭旌高升吉李军连利仙
Owner SICHUAN UNIV
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