Metal powder grading method

A technology of metal powder and grading discs, applied in chemical instruments and methods, solid separation, separating solids from solids with air flow, etc., to achieve high consistency of particle size distribution, improve particle size distribution and dispersion, and stabilize feeding volume effect

Active Publication Date: 2018-05-15
SUZHOU SMART ADVANCED COATING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the technical problem of metal particle classification in the prior art, provide a spherical and spherical micron-sized particle size metal powder processing step, and optimize the combination, especially coating the metal particle surface, and Use airflow as power to convey and classify, so as to achieve high dispersion of materials, high consistency of particle size distribution, and no secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take 20 kg of crushed and dispersed spherical SMT001 silver powder and add it to the classification and collection device through the automatic feeder, using compressed air as the high-pressure air source, the pressure is 3 kg, the feeding speed is 10 kg / hour, and the return air volume of the induced draft fan is 70% Get fine powder, medium powder, coarse powder verification effect: a:PSD data and particle size distribution figure ( Figure 1~4 ); b: SEM photos: SMT001 series silver powder raw materials, SMT001-fine powder, SMT001-medium powder, SMT001-coarse powder ( Figure 5-8 ); Through electron microscope photos and PSD analysis, it can be clearly seen that the particle size distribution of the spherical silver powder after treatment is very consistent, and the dispersion is improved at the same time.

[0052] Table 1: PSD data statistics and distribution diagrams before and after S3 series silver powder treatment in Example 1:

[0053] category

Embodiment 2

[0055] Take 100 kg of dispersed and crushed S6 series spherical silver powder and add it to the classification and collection device through the automatic feeder, using compressed air as the high-pressure air source, the pressure is 6 kg, the feeding speed is 50 kg / hour, and the return air volume of the induced draft fan is 80 %; after classification and collection, get fine powder, medium powder, coarse powder verification effect: a: PSD data and particle size distribution diagram ( Figures 9 to 12 ); b: SEM photos: S6 series silver powder raw materials, S6-fine powder, S6-medium powder, S6-coarse powder ( Figures 13 to 16 ); Through electron microscope photos and PSD analysis, it can be clearly seen that the particle size distribution of the spherical silver powder after treatment is very consistent, and the dispersion is improved at the same time.

[0056] PSD data statistics and distribution diagrams before and after the S6 series silver powder treatment of table 2 embod...

Embodiment 3

[0059] Take 5 kg of dispersed titanium alloy spherical powder and add it to the classification and collection device through the automatic feeder, use nitrogen as the high-pressure air source, the pressure is 4 kg, the feeding speed is 5 kg / hour, and the return air volume of the induced draft fan is 90%. The powder is taken as the following electron microscope photo: SEM3-titanium alloy raw material powder electron microscope photo ( Figure 17 ), the medium powder obtained after SEM3-grading and collection ( Figure 18 ); Through the electron microscope photos, it can be clearly seen that the particle size distribution of the material after treatment is very consistent, and its dispersion is greatly improved.

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Abstract

The invention provides a method adopting air flow grading for spherical and spheroid micro-order-particle-diameter metal powder so as to achieve the effect that particle dispersity is high, the particle diameter distribution consistency is high, and secondary pollution is avoided. The method mainly comprises the following main steps that 1, a selective high-pressure gas source is utilized to accelerate materials; and 2, air flow grading and collecting are conducted. According to the crushing and dispersing method, the dispersity and particle-diameter consistency of different metal particle products can be greatly improved, ultra-micro-fine (the average particle diameter is smaller than 0.1 [mu]m) and ultra-large irregular metal particles (the average particle diameter is larger than 10 [mu]m) are effectively removed, particularly the high-pressure gas source is utilized to serve as material conveying power and used for air flow returning in a grading system, secondary pollution of an equipment body and the environment in the treatment process to the products can be effectively avoided, and thus the metal powder products completely meet production of high-end conductive slurry and 3D printing materials.

Description

technical field [0001] The invention belongs to the technical field of metal powder grading treatment, and in particular relates to a method for grading collection and treatment of spherical and quasi-spherical metal powder products according to different particle sizes. Background technique [0002] Metal powders with high crystallinity, high dispersion, high particle size consistency, and high spherical shape are widely used in solar energy, 3D printing, electronic component manufacturing in the electronics industry, batteries and chemical catalysis, jewelry and other industries. With the highly refined development of solar energy and 3D printing materials, and the development of electronic components towards miniaturization and high performance, the requirements for particle size uniformity (PSD width) of metal powder are getting higher and higher. [0003] The traditional classification of metal powders with different particle sizes adopts mechanical sieving and airflow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B7/086
CPCB07B7/086
Inventor 龚强
Owner SUZHOU SMART ADVANCED COATING TECH CO LTD
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