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Method for preparing cobalt-coated tungsten carbide powder by freezing

A technology for wrapping tungsten carbide powder and tungsten carbide powder, which is applied in transportation and packaging, metal processing equipment, coating, etc., can solve the problems of restricting the preparation of composite powder with high cobalt content, single processing object, and easy introduction of impurities, etc., to achieve product The effect of controllable quality, simple process flow and easy controllable particle size

Active Publication Date: 2019-07-19
HUNAN GOLDEN EAGLE ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production method of tungsten carbide-cobalt composite powder has been difficult to meet the demand, and a number of solid-liquid and liquid-liquid production methods of tungsten carbide-cobalt composite powder have been studied
[0003] In terms of solid-liquid mixing, Chinese patent CN103056376A and Chinese CN102198514A use waste cemented carbide as raw material, mix it with water-soluble carburizing and spheroidizing agent after oxidation and crushing, and prepare a mixed aqueous solution, which is subjected to rapid spray drying, reduction synthesis and carbon adjustment , to obtain tungsten carbide cobalt composite powder, this method has a long process, is easy to introduce impurities, and has a single processing object
Chinese patent CN102198514A uses cobalt salt methanol solution and tungsten carbide powder to mix to obtain planar cement, and then reduces to obtain tungsten carbide-cobalt composite powder. The organic system limits the preparation of composite powder with high cobalt content.
[0006] In summary, the current solid-solid production process has the problem of cobalt segregation and cobalt pools, and there is no simple and versatile WC-Co uniform powder production for solid-liquid and liquid-liquid to solve the problem of high-performance cemented carbide production. raw material problem

Method used

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  • Method for preparing cobalt-coated tungsten carbide powder by freezing
  • Method for preparing cobalt-coated tungsten carbide powder by freezing
  • Method for preparing cobalt-coated tungsten carbide powder by freezing

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt acetate as raw materials, the particle size of tungsten carbide powder is 0.8 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:

[0040] S1. Cobalt precursor solution configuration: take cobalt acetate to prepare a precursor solution with a concentration of 30g / L, and take 1000mL of the solution;

[0041]S2. Freeze crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 500rpm, and perform freeze crystallization, and cool to the end point temperature at a cooling rate of 0.5°C / min. °C, after aging for 2 hours, the solution and the crystals are separated, and the separated solution is returned to step S1 to prepare a cobalt precursor;

[0042] S3. Heat treatment: Dry t...

Embodiment 2

[0045] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt acetate as raw materials, the particle size of tungsten carbide powder is 0.8 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:

[0046] S1. Cobalt precursor solution configuration: take cobalt acetate to prepare a precursor solution with a concentration of 45g / L, and take 1000mL of the solution;

[0047] S2. Frozen crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 800rpm, and carry out frozen crystallization, and cool to the terminal temperature of 0 at a cooling rate of 1.0°C / min. °C, after aging for 3 hours, separate the solution and crystals, and return the separated solution to step S1 to prepare a cobalt precursor;

[0048] S3. Heat treatment: Dry the crys...

Embodiment 3

[0051] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt chloride as raw materials, the particle size of tungsten carbide powder is 0.6 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:

[0052] S1. Cobalt precursor solution configuration: Take cobalt chloride to prepare a precursor solution with a concentration of 20g / L, and take 1000mL of the solution;

[0053] S2. Frozen crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 300rpm, and carry out freeze crystallization, and cool to the end point temperature at a cooling rate of 0.8°C / min - After aging at 1°C for 4 hours, the solution and crystals were separated, and the separated solution was returned to step S1 to prepare a cobalt precursor;

[0054] S3. Heat treatment...

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Abstract

The invention belongs to the field of hard alloy and material metallurgy, and particularly discloses a method for preparing cobalt-coated tungsten carbide powder by freezing. According to the method,metal cobalt salt and tungsten carbide powder are used as raw materials, and the preparation of the uniform cobalt-coated tungsten carbide powder is realized through the steps of dissolution, freezingcrystallization, three-step heat treatment and the like. The method comprises the following steps that the cobalt salt is dissolved in a hot liquid to obtain a cobalt-containing precursor solution, the tungsten carbide powder is added as a nucleating agent and gradually cooled in the stirring process, the cobalt salt is separated out and adhered and wraps outside the tungsten carbide powder to obtain uniformly-wrapped tungsten carbide, and the cobalt salt composite powder is dried, decomposed and reduced to obtain the uniformly-mixed cobalt-coated tungsten carbide powder at three different temperatures. The method realizes uniform tungsten carbide. The preparation method of the cobalt-coated powder has the advantages that the process flow is simple, the Co content of different brands canbe obtained, the granularity is easy to control, and the problem that a cobalt pool and the like in the current hard alloy production process are not uniform is effectively solved.

Description

technical field [0001] The invention belongs to the field of cemented carbide and material metallurgy, and more specifically relates to a method for freezing and preparing cobalt-coated tungsten carbide powder. Background technique [0002] WC / Co cemented carbide materials are widely used in mechanical processing, electronic textiles, national defense and military industry, geology and metallurgy and other fields. At present, the production method of WC / Co cemented carbide is to mix tungsten carbide and cobalt powder by solid ball milling to obtain tungsten carbide-cobalt mixture, which is formed by pressing and sintering. In this method, it is difficult to mix tungsten carbide and cobalt evenly, which affects the performance of cemented carbide products, and makes controlling the formation of cobalt pools a common problem in production. With the development of ultra-fine and low-cobalt cemented carbide, the requirements for mixing tungsten carbide and cobalt are higher. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/22
CPCB22F9/22B22F1/17
Inventor 叶龙刚欧阳臻张妮胡宇杰
Owner HUNAN GOLDEN EAGLE ENERGY TECH CO LTD
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