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Composition of double-principal-phase alloy magnet and preparation method of magnet

A composition, dual main-phase technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc. Intrinsic magnetism, reducing the effect of additives

Inactive Publication Date: 2018-08-07
JIANGXI YG MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Attempts have been made to develop Ce instead of sintered NdFeB magnets, but the intrinsic coercive force of magnets prepared by conventional sintering processes is relatively low, which cannot meet the requirements of practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Preparation of raw materials: separately prepared (PrNd) by quick-setting sheet technology 31 (Fe,TM) 68 B 1 and [(PrNd) 0.5 Ce 0.5 ] 31 (Fe,TM) 68 B 1 Alloy, after hydrogen crushing, dehydrogenation, adding antioxidant, then jet milling or mechanical ball milling, and then adding antioxidant to obtain an average particle size of 3.2nm or less, ready for use;

[0015] 2) Preparing the blank: the step 1) is prepared (PrNd) 31 (Fe,TM) 68 B 1 Magnetic powder and [(PrNd) 0.5 Ce 0.5 ] 31 (Fe,TM) 68 B 1 The magnetic powder is fully mixed according to the ratio of 3:2, and the hydrogen content of the magnetic powder is adjusted to 100ppm at this time, and the mixed powder is subjected to vertical steel molding and cold isostatic pressing to form a blank;

[0016] 3) Graded heat preservation and sintering at a temperature of 800-950°C for 2-6 hours; then tempering treatment at 740-830°C and 360-450°C for 1.5-2.5 hours respectively to obtain the product;

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PUM

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Abstract

The invention relates to the field of neodymium iron boron preparation, in particular to a composition of a double-principal-phase alloy magnet and a preparation method of the magnet. The compositionis prepared from (PrNd)31(Fe,TM)68B1 and [(PrNd)0.5Ce0.5]31(Fe,TM)68B1 in the ratio of 3:2 by weight, wherein TM is one or more of Ga, Co, Cu, Nd and Al elements. By means of the preparation method ofthe double-principal-phase alloy magnet, the double-principal-phase alloy magnet can be industrially produced; meanwhile, by means of a reasonable formula, high-performance Pr and Ce double-principal-phase alloy is prepared, addition of heavy rare earth is reduced, and the intrinsic magnetism is high; principal phase grains of the double-principal-phase magnet basically keep respective Ce contents, diffuse penetration between the adjacent grains is not obvious, but more rare-earth-rich phases exist. Two kinds of principal phase grains large in intrinsic magnetism difference influence each other, and the effect is better than the intrinsic magnetism obtained after a complete solid solution is formed.

Description

technical field [0001] The invention relates to the field of NdFeB preparation, in particular to a composition of a double main phase alloy magnet and a preparation method thereof. Background technique [0002] Attempts have been made to replace sintered NdFeB magnets with Ce, but the intrinsic coercive force of magnets prepared by conventional sintering processes is relatively low, which cannot meet the requirements of practical applications. Since the price of rare earth raw materials fluctuated greatly in 2010, Ce has attracted the attention of researchers again, extensive and in-depth research and development work has begun to emerge as the times require, and people have a deeper understanding of the special properties of Ce in the rare earth family, especially It is the mixed valence characteristics of Ce and its influence on the intrinsic and permanent magnetism of sintered NdFeB magnets. It has become an important guide for people to develop low-cost sintered NdFeB ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C22C38/06C22C38/12C22C38/16C22C38/10
CPCH01F1/0577C22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/16H01F41/0266
Inventor 朱明杨红星王寰宇宋久宝陆柄森蓝鑫陈伟黄慧庆熊武文吴慧玲付国宝
Owner JIANGXI YG MAGNET CO LTD