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Method for preparing high-purity compact tungsten carbide-cobalt composite spherical powder material

A technology of spherical powder and composite powder, which is applied in the field of cemented carbide, can solve problems such as poor processing stability, low bulk density and tap density, weak cobalt and tungsten carbide powder binding force, etc., and achieve fluidity Excellent, narrow particle size distribution effect

Pending Publication Date: 2021-12-17
星尘科技(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt and tungsten carbide powder in the composite powder prepared by this method have weak bonding force, and the process stability is poor due to the powder breaking in the actual application process.
The most important thing is that there are a lot of voids inside the granulated sintered composite powder, which is not dense, and the bulk density and tap density are low, resulting in a large number of micropores and air gaps in products in the fields of 3D printing, thermal spraying or injection molding. And then affect its comprehensive mechanical properties

Method used

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  • Method for preparing high-purity compact tungsten carbide-cobalt composite spherical powder material
  • Method for preparing high-purity compact tungsten carbide-cobalt composite spherical powder material
  • Method for preparing high-purity compact tungsten carbide-cobalt composite spherical powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] According to the proportion of tungsten carbide (94%) and cobalt (6%) in the tungsten carbide-cobalt composite powder, weigh the raw material powder of corresponding quality, after vacuum drying, put it into a V-shaped mixer and mix for 120 minutes. According to the 1:2 mass ratio of tungsten carbide-cobalt composite powder to deionized water, measure the corresponding deionized water, and slowly add 3.0wt.% polyethylene glycol, stir and heat for 2 hours until completely dissolved, and obtain a uniform stabilize the slurry.

[0050] The slurry is granulated through a centrifugal spray drying tower to obtain a granulated composite powder. The feed rate of the spray drying tower is 40ml / min, the inlet temperature is controlled at 220°C, the outlet temperature is controlled at 110°C, and the motor speed is 4500r / min.

[0051] The tungsten carbide-cobalt composite powder obtained after granulation was calcined for 2.5 hours at 750° C. under an argon atmosphere. The tungst...

Embodiment 2

[0054] According to the proportion of tungsten carbide (92%) and cobalt (8%) in the tungsten carbide-cobalt composite powder, weigh the raw material powder of corresponding quality, after vacuum drying, put it into a V-shaped mixer and mix for 120 minutes. According to the 1:2 mass ratio of tungsten carbide-cobalt composite powder to deionized water, measure the corresponding deionized water, and slowly add 3.0wt.% polyethylene glycol, stir and heat for 2 hours until completely dissolved, and obtain a uniform stabilize the slurry.

[0055] The slurry is granulated through a centrifugal spray drying tower to obtain a granulated composite powder. The feed rate of the spray drying tower is 40ml / min, the inlet temperature is controlled at 220°C, the outlet temperature is controlled at 110°C, and the motor speed is 4500r / min.

[0056] The tungsten carbide-cobalt composite powder obtained after granulation was calcined for 2.5 hours at 750° C. under an argon atmosphere. The tungst...

Embodiment 3

[0059] According to the proportion of tungsten carbide (88%) and cobalt (12%) in the tungsten carbide-cobalt composite powder, weigh the corresponding mass of raw material powder, after vacuum drying, put it into a V-shaped mixer and mix for 120 minutes. According to the 1:2 mass ratio of tungsten carbide-cobalt composite powder to deionized water, measure the corresponding deionized water, and slowly add 3.0wt.% polyethylene glycol, stir and heat for 2 hours until completely dissolved, and obtain a uniform stabilize the slurry.

[0060] The slurry is granulated through a centrifugal spray drying tower to obtain a granulated composite powder. The feed rate of the spray drying tower is 40ml / min, the inlet temperature is controlled at 220°C, the outlet temperature is controlled at 110°C, and the motor speed is 4500r / min.

[0061] The tungsten carbide-cobalt composite powder obtained after granulation was calcined for 2.5 hours at 750° C. under an argon atmosphere. The tungsten...

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Abstract

The invention discloses a method for preparing a high-purity compact tungsten carbide-cobalt composite spherical powder material, and the method for preparing the high-purity compact tungsten carbide-cobalt composite spherical powder material comprises the working procedures of mechanical material mixing, spray granulation, atmosphere calcination degreasing and radio frequency plasma spheroidizing / densifying, wherein the mass fraction of tungsten carbide in the tungsten carbide-cobalt composite powder is 80%-95%, and the mass fraction of cobalt in the tungsten carbide-cobalt composite powder is 5%-20%. The method has the advantages that the high-purity compact spherical tungsten carbide-cobalt composite powder prepared by adopting mechanical mixing, spray granulation and atmosphere high-temperature calcination degreasing in combination with a radio frequency plasma spheroidizing process is particularly suitable for processes such as 3D printing, powder metallurgy and thermal spraying, and the composite powder has the advantages of relatively high sphericity, narrow particle size distribution, and excellent flowing property, a good powder laying or filling effect in the using process is guaranteed, and high-density formed products can be obtained easily.

Description

technical field [0001] The patent of the invention relates to the technical fields of 3D printing, powder metallurgy materials, thermal spraying materials and hard alloys, and in particular to a method for preparing high-purity dense tungsten carbide-cobalt composite spherical powder materials. Background technique [0002] Tungsten carbide has the advantages of high melting point, high hardness, poor electrical and thermal conductivity, and stable chemical properties. It is an ideal material for the preparation of wear-resistant and corrosion-resistant parts, and is widely used in aerospace, machinery, petrochemical, metallurgy, electric power engineering and other fields. Due to the high melting point, high hardness and significant brittleness of tungsten carbide, it is difficult to form by traditional casting and machining methods. Therefore, tungsten carbide powder is rarely used alone in 3D printing, powder metallurgy, thermal spraying and other fields. Usually, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/949B22F1/00B22F9/02B22F9/14B33Y70/10C22C1/05C22C29/08C23C4/06
CPCC01B32/949B22F9/026B22F9/14C22C1/051C22C29/08C23C4/06B33Y70/10C01P2004/03
Inventor 毛新华肖杰邦江杰芬
Owner 星尘科技(广东)有限公司