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A kind of hddr prepares neodymium iron boron material and preparation method thereof

A technology of NdFeB and FeB, which is applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of time-consuming and energy-consuming, and achieve the purpose of suppressing grain growth, fine grain size, and improving correction. The effect of tenacity

Active Publication Date: 2020-05-29
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing conventional HDDR process, the HDDR process can only be carried out after about 24 hours of heat treatment at a temperature of 1100-1200 ° C, which consumes a lot of time and energy.

Method used

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  • A kind of hddr prepares neodymium iron boron material and preparation method thereof
  • A kind of hddr prepares neodymium iron boron material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for preparing NdFeB material by HDDR, the steps are as follows:

[0048] (1) In at%, according to Nd 13 Fe 60.5 co 14.5B 6.4 Zr 2.6 Zn 3 The ratio of metal neodymium, iron, boron iron, electrolytic cobalt, metal zirconium, and metal zinc is mixed evenly, placed in a vacuum induction furnace, melted under the protection of argon, and cast to obtain an alloy ingot; then the alloy ingot is broken , inductively heated and melted in the quartz tube of the quick-setting cast sheet preparation device under vacuum conditions, and cast on a copper roller rotating at a high-speed rotation speed of 5m / s under the injection pressure of 0.08MPa to form a thickness of about 0.25mm The quick-setting casting sheet, the quick-setting casting sheet is broken into 1-5mm long flakes;

[0049] (2) The quick-setting cast sheet obtained in step (1) is heated to 950° C. at a heating rate of 55° C. / min under the protection of argon, and heat-treated for 1...

Embodiment 2

[0055] The present embodiment refers to the preparation method of Example 1, the difference is only: in at%, by Nd 13 Fe 60.2 co 14.8 B 6.4 Zr 2.1 Zn 3.5 The ratio is based on metal neodymium, iron, boron iron, electrolytic cobalt, metal zirconium, and metal zinc.

Embodiment 3

[0057] The present embodiment refers to the preparation method of Example 1, the difference is only: in at%, by Nd 13 Fe 60.8 co 14.2 B 6.4 Zr 2.9 Zn 2.7 The ratio is based on metal neodymium, iron, boron iron, electrolytic cobalt, metal zirconium, and metal zinc.

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Abstract

The invention relates to the technical field of NdFeB materials, in particular to an HDDR prepared NdFeB material and a preparation method thereof. The preparation method comprises the steps of: preparing metal neodymium, iron, ferroboron, electrolytic cobalt, metal zirconium and metal zinc in the proportion of Nd13Fe(75-Y)CoYB6.4ZrXZn(5.6-X) by at%, smelting the raw materials under the protectionof an argon gas, casting the molten raw materials to obtain an alloy cast ingot, crushing the alloy cast ingot, and preparing quick-hardening cast pieces; performing heat treatment on the quick-hardening cast pieces at 900 to 1000 DEG C for 1-2 h under the protection of the argon gas; and performing HDDR processing on the quick-hardening cast pieces after heat treatment to obtain a NdFeB material, wherein X=1.5-3.2, Y=14-15. Through adjusting the appropriate raw materials and the process conditions of the HDDR steps, the NdFeB material with excellent performance can be obtained without long-time homogenization heat treatment in advance, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of neodymium-iron-boron materials, in particular to an HDDR-prepared neodymium-iron-boron material and a preparation method thereof. Background technique [0002] The hydrogenation-disproportionation-dehydrogenation-recombination process (HDDR, Hydrogenation–Decomposition–Desorption-Recombination) is currently a relatively practical method for preparing anisotropic NdFeB magnetic powder. Using the HDDR process, the coarse grains of the original master alloy can be transformed into a large number of submicron fine grains with an average grain size of about 0.3 μm, and the size of these submicron grains is close to that of Nd 2 Fe 14 The B-phase single magnetic domain size is uniformly arranged along the direction of the easy magnetization axis of the original master alloy grains, so that the magnetic powder particles exhibit high anisotropy to the outside. [0003] However, in the existing conventional HDDR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/00
CPCH01F1/0573H01F41/00
Inventor 刘荣明刘冬熊君张康周小文刘辉王倩贾立颖李炳山
Owner BGRIMM TECH CO LTD