High ant-erosion and high performance R-Fe-B agglomeration magnetic body and its making method

A sintered magnet, high-performance technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problem of low magnetic performance, achieve high magnetic performance, reduce production costs, and save consumption.

Inactive Publication Date: 2008-09-17
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned invention improves the corrosion resistance of R-Fe-B sintered magnets, its magnetic properties are low, and it cannot meet the needs of small-volume, high-efficiency and energy-saving permanent magnet motors represented by computer high-density hard disk drives (HDDs). need

Method used

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  • High ant-erosion and high performance R-Fe-B agglomeration magnetic body and its making method
  • High ant-erosion and high performance R-Fe-B agglomeration magnetic body and its making method
  • High ant-erosion and high performance R-Fe-B agglomeration magnetic body and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～15

[0011] According to the composition of sintered magnet (weight percent) Nd 29-x-y PR x Dy y Cu 0.1 Ga 0.1 B 1 Zr 0.1 Fe 余量 (x=0~8; y=0~3), the raw materials with a purity greater than 99wt% are prepared in proportion, and melted in a 200~700Kg / time strip casting furnace (strip casting), with 5000~8000 ℃ / s cooling rate, scale casting, and finally get 0.1 ~ 0.3mm thick scales; send the scales to the hydrogen pulverization treatment furnace for hydrogen pulverization, hydrogen absorption under 90kPa hydrogen pressure for 1 to 4 hours, and then at 200 ℃ Vacuum dehydrogenation in the temperature range of ~600°C for 6-8 hours, so that the hydrogen pressure is below 10Pa, and after cooling for 6-8 hours, hydrogen crushed fragments are obtained; the crushed hydrogen fragments are placed in an oxygen-free environment with an oxygen content close to 0%. Send it to the middle grinding mill for crushing, and add oxygen element in a controlled manner during the middle grinding proce...

Embodiment 16

[0016] The production process is the same as above, consisting of (Nd 29-x-y-z PR x Dy y Tb z )Cr 0.1 Cu 0.15 Ga 0.1 B 1 Al 0.1 Zr 0.1 Fe 余量 , (x=0~8; y=0~3; z=0~2), adjust the values ​​of x, y, and z to obtain magnets with high corrosion resistance, high magnetic energy product, and high coercive force, and the magnet density is 7.59 ~7.63g / cm 3 , and the measurement results are shown in Table 2.

[0017] Table 2 Composition, corrosion resistance and magnetic properties of high energy product and high coercivity magnets

[0018]

Embodiment 17～18

[0020] The production process is the same as above, consisting of (Nd 29.5-x-y PR x Dy y )Mo 0.4 Cu 0.15 Ti 0.1 B 1 Nb 0.2 Fe 余量 , (x=0~8; y=1~4), adjust the values ​​of x and y to obtain magnets with high corrosion resistance, high magnetic energy product and high coercive force, and the magnet density is 7.59~7.63g / cm 3 , and the measurement results are shown in Table 3.

[0021] Table 3 Composition, corrosion resistance and magnetic properties of high energy product and high coercivity magnets

[0022]

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Abstract

The invention discloses a magnet and a manufacturing method thereof, more particularly a sintering magnet with outstanding corrosion resistance and high performance R-(Fe, TM)-Cu-B-X system and a manufacturing method thereof; condition of the magnet is HAST experiment of 130 DEG C, 95% rRH, 2,7bar air pressure, magnet weightlessness in 20 days is less than 2mg/cm<2>, sum of [(BH)max]+[jHc] reaches 64-75, density of the magnet reaches 7.56-7.8g/cm<2>; in the process of manufacturing, an oxygen-free procedure technology using inertia gases or N<2> gas for protection controls contents of oxygen, carbon, nitrogen and hydrogen in the magnet, adjusts cooling speed of a continuous casting furnace with blanks, and controls thickness of an alloy sheet, granularity of powders and pressed compact density within a special range in order to obtain the sintering magnet with outstanding corrosion resistance and high performance R-Fe-B system, greatly saving the strategic metal Co and reducing the cost.

Description

1. Technical field [0001] The invention discloses a magnet and a manufacturing method thereof, in particular a high-performance R-(Fe, TM)-Cu-B-X system sintered magnet with excellent corrosion resistance and a manufacturing method thereof, belonging to the technical field of rare earth magnetic materials. 2. Background technology [0002] Since the sintered R-Fe-B series permanent magnet came out in 1983, because of its excellent magnetic properties, relatively low price and sufficient resource reserves, it has rapidly been used in computers, electrical engineering, medical equipment, mobile phones, household appliances, communications, Widely used in the automotive industry and other fields. However, the most obvious disadvantage of R-Fe-B permanent magnets compared with Sm-Co permanent magnets is their poor corrosion resistance, which limits the application of such magnets in humid, high temperature and other environments, so about R-Fe-B It is of great significance to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/12
Inventor 王玉林李广军史丙强于永江陈贵荣徐兆浦
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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