Chemic homogeneous coprecipitation method for preparing precursor body of permanent magnetic material of terrae rare cobalt

A technology of permanent magnet materials and precursors, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of small particle size of rare earth permanent magnet powder, and achieve complete grain structure, precise chemical ratio, and excellent magnetic properties Effect

Inactive Publication Date: 2007-12-12
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the existing reduction-diffusion method, and provide a method that can reduce production costs. The rare earth permanent magnet powder product produced by this precursor has a small particle size, a particle close to a spherical shape, a smooth surface, no need for ball milling, and no Due to lattice defects caused by powerful ball milling, a chemical uniform co-precipitation preparation method of a rare earth-cobalt permanent magnet material precursor with excellent magnetic properties

Method used

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  • Chemic homogeneous coprecipitation method for preparing precursor body of permanent magnetic material of terrae rare cobalt
  • Chemic homogeneous coprecipitation method for preparing precursor body of permanent magnetic material of terrae rare cobalt

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 1.0mol / L CoCl 2 solution and 0.2mol / L SmCl 3 Each solution is 500ml, mixed at room temperature, heated to 28-32°C to adjust pH=2.0; then take 1.0mol / L NH 4 HCO 3 Solution 1.0L, heated to 28-32°C to adjust pH = 9.5; fast feed in parallel flow, feed speed control is based on pH adjustment between 6.5-7.0. After the feeding is completed, the temperature is raised to about 60° C. and aged for 1.5 hours. During the aging process, NaOH and HCl are used to adjust the pH range to 6.5-7.0, and the stirring speed is controlled at 200 rpm during the feeding and aging process. After aging, filter and wash the powder with hot water until the anions cannot be detected. After drying, samarium-cobalt basic carbonate precursor powder was obtained, the weight was 16.5g, the cobalt-samarium molar ratio was 5:1, X-Ray showed that it was amorphous, the powder particle size was between 0.2-20 μm, and the average particle size was 5 μm Left and right, the shape is spherical or spher...

Embodiment 2

[0034] Take 0.1mol / L CoCl 2 solution and 0.02mol / L SmCl 3 Each solution is 500ml, mixed at room temperature, heated to 28-32°C, adjusted to pH=20; then take 0.1mol / L NH 4 HCO 3 Solution 1.0L, heated to 28-32°C, and adjusted to pH = 9.5; quickly fed in parallel flow, and the feeding speed was controlled so that the pH of the reaction mixture was between 6.5 and 7.0. After the feeding is completed, the temperature is raised to about 60°C for aging for 1.5 hours, and the stirring speed is controlled to 300 rpm. During the aging process, the pH is controlled to be 6.5-7.0, and the pH value is adjusted with NaOH and HCl, and the stirring speed is controlled at 200 rpm during the feeding and aging process. After aging, filter and wash the powder with hot water until the anions cannot be detected. After drying, 1.55 g of samarium cobalt basic carbonate precursor powder was obtained.

[0035] The obtained samarium cobalt basic carbonate precursor powder was heated in CO 2 Atmosp...

Embodiment 3

[0037] Take lmol / L of CoCl 2 solution and 0.2mol / L of PrCl 3 Each solution is 500ml, mixed at room temperature, heated to 28~32°C to adjust pH=2.0; then take 1mol / L NH 4 HCO 3 Solution 1L, heated to 28~32°C to adjust pH=9.5, fast feeding in parallel flow, feeding speed control is based on pH adjustment between 6.5~7.0. After the feeding is completed, the temperature is raised to about 60° C. and aged for 1.5 hours. During the aging process, the pH is controlled at 6.5~7.0, and the pH value is adjusted with NaOH and HCl. After completion, filter and wash the powder with hot water until the anions cannot be detected. After drying, 17.3 g of praseodymium cobalt basic carbonate precursor powder was obtained. The obtained praseodymium cobalt basic carbonate precursor powder was calcined at 700°C for 5 hours in an Ar atmosphere to obtain 12.7g of oxide powder (a mixture of praseodymium oxide and cobalt oxide) for reduction and diffusion in a vacuum or protective atmosphere tre...

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Abstract

Mixing soluble terrae rare and chloride or nitrate of cobalt, adding precipitator of ammonium carbonate or ammonium bicarbonate, the method obtains precursor body of permanent magnetic material of terrae rare-cobalt from even deposition. Admixture of oxides is prepared after the said precursor body is calcined. Reduction and diffusion procedure is carried out to produce alloy powder of terrae rare-cobalt ReCo5 or Re2Co17. Size of granularity can be controlled within 5-10 micros without need of ball milling. Features are: accurate chemical compounding ratio, integrated grain structure with no lattice defect caused by ball milling, excellent magnetic performance, and low production cost since salts of cobalt and terrae rare are used to replace related metal cobalt and terrae.

Description

technical field [0001] The invention relates to a preparation method for producing a rare earth cobalt alloy powder precursor by a reduction-diffusion method, in particular to a chemical co-precipitation preparation method for a rare earth-cobalt permanent magnet material precursor. Background technique [0002] At present, the reduction-diffusion method has been applied to the preparation of rare earth permanent magnet materials. Such as CN1035700C, JP Ping 2-102501A etc., it is to adopt metallic calcium to reduce rare earth oxide, make it into pure metal, then through the interdiffusion of transition group metal atoms such as rare earth metal and cobalt, directly make rare earth permanent magnet powder. However, the alloy material produced by the existing reduction-diffusion method has a large particle size and requires strong ball milling. However, the alloy product will encounter serious oxidation problems during ball milling, which will reduce the performance of the mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053B22F9/24
Inventor 郭学益李平黄凯刘晓剑卿波
Owner CENT SOUTH UNIV
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