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Preparing method of R-Fe-B sintered magnet

A sintered magnet, r-fe-b technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as poor controllability, achieve good uniformity, reduce processing costs, and improve appearance Effect

Active Publication Date: 2014-03-19
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using this method has strict requirements on the composition of the sintered magnet to be processed, heat treatment temperature, heat treatment furnace atmosphere and support material, and the controllability is poor.

Method used

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  • Preparing method of R-Fe-B sintered magnet
  • Preparing method of R-Fe-B sintered magnet
  • Preparing method of R-Fe-B sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The weight ratio of neodymium, praseodymium, dysprosium, terbium, electrolytic iron, cobalt, copper, gallium, aluminum, zirconium and boron: Nd-23.8%, Pr-5%, Dy-0.6%, Tb-0.4%, Fe-68.29 %, Co-0.5%, Cu-0.13%, Ga-0.1%, Al-0.1%, Zr-0.12%, B-1%, pouring is completed in a vacuum melting furnace under an inert gas environment, and the pouring temperature is 1450°C , the speed of the quenching roll is 60r / min, and the thickness of the obtained scales is about 0.3mm; the scales are made into powders with an average particle size of 3.5μm after HD powder milling and jet milling; they are oriented and pressed in a magnetic field of 15KOe to make compacts ; put the compact into a sintering furnace under Ar atmosphere, sinter at 1100° C. for 5 hours to obtain a green compact, and age the green compact at 500° C. for 5 hours to obtain a sintered blank. Process the sintered blank into a 50M magnet with a size of 40mm*20mm*4mm by wire cutting, denoted as M 0 .

[0045] Take three mat...

Embodiment 2

[0051] The same smelting, powder making, pressing, heat treatment and wire cutting methods as in Example 1 were used to prepare 50M magnetic sheets.

[0052] Take two material boxes D and E with a size of 300mm*200mm*60mm, and cover the bottoms of the material boxes D and E with Dy boards with a size of 50mm*50mm*2mm, and then add silicon dioxide powder into the material box D (Powder particle size is about 500μm), add silica pellets (3mm in diameter) into material box E, and add silicon dioxide in both material boxes to a distance of 1cm from the upper edge of the material box. Then, after degreasing, pickling, activation, and deionized water washing, the 50M magnets are dried and inserted vertically into the silica powder and the pellets along the direction of length 40mm, and the distance between the magnets is 5mm to ensure The lower end of the magnet is not in contact with the Dy metal evaporation source, and the upper end of the magnet is completely covered by zirconia p...

Embodiment 3

[0058]The same smelting, powder making, pressing, heat treatment and wire cutting methods as in Example 1 were used to prepare 50M magnetic sheets.

[0059] Take a material box F with a size of 300mm*200mm*60mm, cover the bottom of the material box F with Dy boards with a size of 50mm*50mm*2mm, and then add alumina powder (powder particle size about 100μm) into the material box F , aluminum oxide powder is added to the distance from the upper edge of the box 1cm. Then, after degreasing, pickling, activation and deionized water washing, the 50M magnets are dried and inserted vertically into the alumina powder and pellets along the length of 40mm, and the distance between the magnets is 5mm to ensure that the magnets The lower end of the magnet is not in contact with the Dy metal evaporation source, and the upper end of the magnet is completely covered by alumina powder.

[0060] Place the material box F in a vacuum sintering furnace, at a temperature of 950°C, under vacuum con...

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Abstract

The invention relates to a preparing method of an R-Fe-B sintered magnet. The preparing method of the R-Fe-B sintered magnet comprises, firstly utilizing a conventional method to prepare the R-Fe-B sintered magnet, and cleaning the sintered magnet through the steps such as oil removing, acid-washing and water deionization; secondly, bespreading metal Dy (dysprosium) at the bottom of a material box in any shape, and then filling the inside of the material box with zirconia, silicon dioxide or aluminium oxide powder; thirdly, inserting the sintered magnet into the powder in a direction perpendicular to a magnetizing direction, or placing the metal Dy plate, high-melting-point powder particles, the sintered magnet and high-melting-point powder particles sequentially inside the material box in a layered mode, wherein the bottom end of the magnet is not in contact with the Dy particles at the bottom of the material box, and adjacent magnets are not in contact with each other; finally, putting the material box inside the sintering furnace, and performing heat treatment in vacuum or Ar (argon) protective atmosphere at the temperature of 750-1000 DEG C and enabling the Dy to enter the inside of the sintered magnet along a grain boundary through diffusion. By means of the preparing method of the R-Fe-B sintered magnet, the processing cost of the Dy is greatly reduced, the process is simplified, and the coercivity of the magnet after heat treatment is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of an R-Fe-B system sintered magnet, belonging to the field of rare earth permanent magnet materials. Background technique [0002] Due to its excellent magnetic properties, R-Fe-B sintered magnets have been widely used in information industry, automobile industry, electric equipment, household appliances, petrochemical industry, machinery manufacturing, aerospace, medical machinery and other fields since their invention. [0003] In the past two years, due to fluctuations in the price of rare earth raw materials, especially after the price of heavy rare earth raw materials has experienced a sharp rise, rare earth magnet customers are urgently requesting rare earth magnet suppliers to use new processes to reduce the use of heavy rare earth raw materials and reduce costs; many rare earth magnets Magnet customers have begun to consider using cheaper ferrite magnets to replace some of the previously used NdFeB...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/10
Inventor 王庆凯孙秀彦于永江刘磊金艳梅
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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