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Preparation method for chromium-doped cobalt powder

A technology for cobalt powder and powder, applied in the field of metal cobalt powder preparation, can solve the problems of poor dispersibility and uneven particle size of doped cobalt powder, and achieve the effects of good dispersibility, good fluidity and improved toughness

Inactive Publication Date: 2019-01-04
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a method for preparing cobalt powder doped with chromium, which solves the problems of uneven particle size and poor dispersion of doped cobalt powder in the prior art

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  • Preparation method for chromium-doped cobalt powder
  • Preparation method for chromium-doped cobalt powder
  • Preparation method for chromium-doped cobalt powder

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preparation example Construction

[0039] The invention provides a kind of preparation method of the cobalt powder doped with chromium, this method realizes by following steps:

[0040] Step 1, get a certain amount of cobalt chloride, add 50~70 DEG C of water to it, and stir to dissolve, the cobalt concentration that is mixed with is the cobalt chloride solution of 80~140g / L; Get a certain amount of ammonium bicarbonate, Add water at 50-60°C, stir and dissolve, and prepare an ammonium bicarbonate solution with an ammonia concentration of 160-230g / L for later use; use water at a certain temperature to prepare cobalt chloride and ammonium bicarbonate solutions respectively, so that Cobalt chloride and ammonium bicarbonate have been fully dissolved, and the dispersibility of cobalt ions in the cobalt chloride solution and the dispersibility of carbonate ions in the ammonium bicarbonate solution have also been improved;

[0041] Step 2, add chromium chloride hexahydrate (CrCl 3 ·6H 2 O), stir evenly, obtain doped...

Embodiment 1

[0059] Step 1) Get a certain amount of cobalt chloride and put it into the solution tank, add water at 50°C therein, and stir and dissolve, and prepare a cobalt chloride solution whose concentration of cobalt (Co) is 90g / L; then take a certain amount Put the ammonium bicarbonate into another solution tank, add water at 50°C therein, and stir to dissolve, and prepare an ammonium bicarbonate solution with an ammonia concentration of 180g / L for subsequent use;

[0060] Step 2) take 3L prepared cobalt chloride solution, and add 7.69gCrCl 3 ·6H 2 0, stir evenly, the concentration that obtains chromium (Cr) is 0.5g / L (500ppm) doping cobalt chloride solution;

[0061] Step 3) degreasing the prepared ammonium bicarbonate solution and the doped cobalt chloride solution respectively;

[0062] Step 4) Add 1.5L of pure water into the reactor as the bottom liquid, and heat the pure water to make the temperature of the bottom liquid reach 30°C, then add the doped cobalt chloride solution ...

Embodiment 2

[0069] Step 1) Get a certain amount of cobalt chloride and put it into the solution tank, add water at 60°C therein, and stir and dissolve to prepare a cobalt chloride solution whose concentration of cobalt (Co) is 100g / L; then take a certain amount Put the ammonium bicarbonate into another solution tank, add water at 55°C therein, and stir to dissolve, and prepare an ammonium bicarbonate solution with an ammonia concentration of 190g / L for subsequent use;

[0070] Step 2) Take 3L of prepared cobalt chloride solution, and add 4.61gCrCl 3 ·6H 2 0, stir evenly, obtain the doping cobalt chloride solution that the concentration of chromium (Cr) is 0.3g / L (300ppm);

[0071] Step 3) degreasing the prepared ammonium bicarbonate solution and the doped cobalt chloride solution respectively;

[0072] Step 4) Add 1.5L of pure water into the reactor as the bottom liquid, and heat the pure water so that the temperature of the bottom liquid reaches 40°C, and then add the doped cobalt chlo...

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Abstract

The invention discloses a preparation method for chromium-doped cobalt powder. The method is realized through the following steps: 1) preparing a cobalt chloride solution and an ammonium bicarbonate solution; 2) adding chromium chloride hexahydrate into the cobalt chloride solution; 3) carrying out oil removal on the ammonium bicarbonate solution and the doped cobalt chloride solution separately;4) mixing the solutions to react; 5) filtering and washing products; 6) drying and breaking the washed doped cobalt carbonate under a certain condition; 7) reducing the crushed doped cobalt carbonatepowder under a condition that hydrogen is charged; and 8) passivating and crushing the reduced doped products to prepare the target object. Element chromium is doped into the crystal lattices of cobalt carbonate through the doping manner of the method, so that the chromium-doped cobalt powder with high dispersibility and uniform particle size is finally prepared; and the chromium-doped cobalt powder is selected for manufacturing a hard alloy, and the physical performance of toughness, corrosion resistance and wear resistance of the hard alloy can be obviously improved, so that the use performance of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of metal cobalt powder preparation, and relates to a preparation method of chromium-doped cobalt powder. Background technique [0002] Cobalt powder is a gray irregular powder, soluble in acid, magnetic, and easy to oxidize in humid air. It is usually an excellent binder for cemented carbide and one of the important raw materials for producing cemented carbide. Its shape and particle size It determines the bonding performance, strength and toughness of super hard alloy materials, and is very important to the performance of super hard alloy materials. [0003] With the development of science and technology, cobalt powder has been widely used in the special industry of diamond tools and cemented carbide. The basic requirements of cemented carbide for cobalt powder are high purity, uniform particle size, good dispersion, and particle shape close to spherical , the degree of reunion is low. At this time, resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 许开华郭苗苗吴伟陈元骁
Owner JINGMEN GEM NEW MATERIAL
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