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Alloy for Sm-Co based magnet, method for production thereof, sintered magnet and bonded magnet

A magnet alloy, alloy technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve problems such as magnetic difference

Inactive Publication Date: 2007-01-31
SANTOKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the alloy will be less magnetic than alloys produced by the RD or die casting methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (Preparation of Sm-Co-based magnet alloy)

[0054] In a vacuum high-frequency induction furnace, a metal mixture containing 32.6 wt% Sm and 67.4 wt% Co was melted under an argon atmosphere and cast using a casting device with a single water-cooled copper roll to obtain a sample (1). Before casting started, the cooled surface of the roll was preheated to 350° C. with a heater. During casting, the temperature of the cooling surface of the roll is controlled within the range of 200-600° C. under the monitoring of an infrared thermal image analyzer.

[0055] The sample (1) was pulverized and used for measurement of X-ray diffraction intensity in an X-ray diffractometer (manufactured by RIGAKU CORPORATION, RINT2500). From the X-ray diffraction data, it can be found that corresponding to Sm 2 co 7 The X-ray diffraction intensity (B) of the (119) plane of the phase corresponds to that of SmCo 5 The ratio (B / A) of the X-ray diffraction intensity (A) of the (111) plane of th...

Embodiment 2-10 and comparative example 1-6

[0062] Samples (2)-(5) were prepared and measured in the same manner as for sample (1) in Example 1 except that the Sm content was changed as shown in Table 1. Sample (6) was prepared and measured in the same manner as for sample (1) in Example 1, except that the Sm content was varied as shown in Table 1; without preheating the roll with a heater Casting was initiated with rolls having a cooling surface temperature of 20° C. and continued without control of the cooling surface temperature of the rolls. A 60 mm thick sample (7) was prepared and measured in the same manner as for sample (1) in Example 1, except that the Sm content was changed as shown in Table 1; The casting apparatus of the mold replaces the casting apparatus with a single water-cooled copper roll. Samples (8) of 5 mm thickness were prepared and measured, wherein the Sm content was varied as shown in Table 1, and using a casting apparatus with a water-cooled copper mold, wherein the mold was pre-heated with a ...

Embodiment 11 and 12

[0069] At 1120°C, the alloy powders of the samples (2)-(8) shown in Table 1 were subjected to solution heat treatment for 1 hour, ground into powders with an average particle size of 20-60 microns in a disk mill, and ground at 900 ℃ for aging heat treatment for 4 hours. The obtained powder was kneaded with 2 volume % of epoxy resin to prepare a resin-containing mixture. Under the magnetic field of 30kOe, at 5t / cm 2 The resin-containing mixture was pressed under a pressure of 150° C. for 2 hours to obtain a bonded magnet. The magnetic properties of the bonded magnet thus produced were measured in the same manner as in Example 1. The results are listed in Table 4.

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Abstract

The present invention relates to a Sm-Co based magnet alloy useful as a raw material for producing magnets having high magnetic properties, such as sintered or bonded magnets, methods for producing such an alloy, and sintered or bonded magnets having excellent corrosion resistance and high magnetic properties, such as high coercivity and good squareness. The magnetic alloy is composed of an alloy represented by the formula RM with 32.5 to 35.5 wt % R such as Sm and the balance of M such as Co, wherein ratio (B / A) of the X-ray diffraction intensity (B) corresponding to the (119) plane of R2M7 phase to the X-ray diffraction intensity (A) corresponding to the (111) plane of RM5 phase is not higher than 0.1.

Description

technical field [0001] The present invention relates to a Sm-Co-based magnet alloy, a production method thereof, and a sintered or bonded magnet using the Sm-Co-based magnet alloy. Background technique [0002] For the production of Sm-Co-based magnet alloys, the reduction-diffusion method (RD method) is known and is currently used in practice. The RD method involves heating rare earth metal oxides and other constituent metal oxides together with a reducing agent such as metallic calcium or calcium hydride in an inert atmosphere to reduce the rare earth oxides to metals while allowing them to diffuse into the other constituent metals. in metal. Then, the reaction product was cooled to room temperature and introduced into water to dissolve and remove reduction products such as CaO, CaO 2 2CaCl 2 , and Ca(OH) 2 , and unreacted remaining calcium metal. The resulting product can optionally be acid-treated. [0003] Another method actually used is a casting method, which in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B22F9/04H01F1/04H01F1/08C22C1/04C22C30/00H01F1/055
CPCH01F1/0557H01F1/0558H01F1/0555C22C1/0441
Inventor 小西谦治新谷和雅
Owner SANTOKU CORP
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