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A kind of dispersion method of superfine wc powder

A dispersion and powder technology, which is applied in the field of ultrafine WC powder dispersion, can solve the problems of powder deposition, poor powder dispersion effect, weak powder force, etc., to solve the problem of uneven composition, small particle size, evenly dispersed effect

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the physical dispersion method, due to the mechanical stirring dispersion method, the force on the powder in the lower part of the liquid and the middle part will be inconsistent, so that the powder is prone to partial deposition on the edge of the lower part; ultrasonic stirring will make the force on the powder in the upper part of the liquid weaker , the dispersion effect of the powder is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] At room temperature, take 50g of WC powder with an average size of 400nm and put it into 1L of deionized water, then add 1.4g of dispersant SDS, and perform ultrasonic dispersion and mechanical stirring treatment on it. The ultrasonic frequency is 35KHz, the ultrasonic power is 100W, and the mechanical stirring speed is The stirring time is 120r / min, and the stirring time is 15min. After stirring, the dispersed slurry is obtained. The obtained slurry is subjected to suction filtration for 3 times with a vacuum filtration device, and the suction filtration time is 120min each time. The precipitate obtained after the suction filtration is placed in a drum at 80°C Dry in an air drying oven for 12 hours. The average particle size of the dispersed powder was detected, and the detected value was 412nm. D10=406nm, D50=410nm, D90=438nm.

Embodiment 2

[0043] Under the condition of 5°C, put 100g of WC powder with an average size of 200nm into 1.8L of deionized water, then add 3g of dispersant SDS, and perform ultrasonic dispersion and mechanical stirring treatment on it. The frequency of ultrasonic wave is 35KHz, and the ultrasonic power is 100W. , the mechanical stirring speed is 200r / min, and the stirring time is 20min. After stirring, a dispersed slurry is obtained. The obtained slurry is filtered 3 times using a vacuum filtration device, and the suction filtration time is 180min each time. The precipitate obtained after the suction filtration is placed in Dry for 12 hours in a blast oven at 80°C. The average particle size of the dispersed powder was detected, and the detected value was 226nm. D10=214nm, D50=223nm, D90=271nm.

Embodiment 3

[0047] At room temperature, take 200g of WC powder with an average size of 100nm and put it into 4L of deionized water, then add 7.2g of dispersant SDS, and perform ultrasonic dispersion and mechanical stirring on it. The ultrasonic frequency is 35KHz, the ultrasonic power is 100W, and the mechanical stirring speed is The stirring time is 240r / min, and the stirring time is 30min. After stirring, a dispersed slurry is obtained. The obtained slurry is subjected to suction filtration for 3 times with a vacuum filtration device, and each time of suction filtration is 240min. The precipitate obtained after suction filtration is placed in a drum at 80°C. Dry in an air drying oven for 12 hours. The average particle size of the dispersed powder was detected, and the detected value was 138nm. D10=116nm, D50=130nm, D90=151nm.

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Abstract

The invention relates to a method for dispersing superfine WC powder, and belongs to the technical field of dispersion of superfine materials. The method comprises the following steps: with superfine WC powder of which the particle size is 100-500nm as a raw material, carrying out dispersing treatment on the WC powder by adding a dispersing agent and utilizing ultrasonic dispersion and mechanical stirring; and carrying out vacuum filtration and drying to obtain evenly dispersed WC powder. The dispersing agent adopted in the process is lauryl sodium sulfate (SDS); the adding amount is 0.7-2.1g / L; the ultrasonic dispersion and mechanical stirring time is 10-180 minutes; the stirring speed is 50-800r / min; and the solid-liquid ratio is (1 to 10) to (1 to 100). According to the method disclosed by the invention, the problem that the superfine WC powder is easy to reunite in the use procedure is solved; the physical and chemical combination dispersing method is simple in technological process and relatively low in cost; and the average size of the dispersed superfine powder is close to the actual particle size.

Description

technical field [0001] The invention relates to a method for dispersing ultrafine WC powder, and belongs to the technical field of dispersion of ultrafine materials. Background technique [0002] Due to the advantages of high strength and high hardness, WC-based cemented carbide has a wide application prospect in industry, but the contradiction between its strength and toughness restricts its application range. Studies have shown that when the grain size reaches the ultra-fine level, the mechanical properties such as strength and toughness, electrical properties and thermal properties of cemented carbide are greatly improved. Ultra-fine cemented carbide is the solution to the contradiction between strength and toughness. Effective Ways. The high strength and high hardness of ultra-fine WC-based cemented carbide have a wide range of applications, suitable for fine machining, precision molds, micro-drills for printed circuit boards, etc., driving various precision instruments...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 肖来荣赵小军郭蕾蔡圳阳宋宇峰周皓章玮
Owner CENT SOUTH UNIV
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