A method for crushing and dispersing spherical and quasi-spherical metal powders

A metal powder and spherical-like technology, which is applied in chemical instruments and methods, metal processing equipment, solid separation, etc., to achieve the effect of large crushing capacity, high dispersion, and easy crushing and dispersion

Active Publication Date: 2020-04-24
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 crushing and dispersing in the prior art, to provide a spherical and spherical micron-sized metal particle aggregate treatment step, and to optimize the combination, especially to pre-coat the particle surface and Pre-crushing treatment in the drying process makes these materials easy to break and disperse when they are broken by airflow, and not easy to be oxidized, so as to achieve the requirements of effective breaking of material aggregates, monodisperse particles, and no secondary oxidation pollution

Method used

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  • A method for crushing and dispersing spherical and quasi-spherical metal powders
  • A method for crushing and dispersing spherical and quasi-spherical metal powders
  • A method for crushing and dispersing spherical and quasi-spherical metal powders

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1.1 Take 20 kg of spherical SMT001 silver powder, put it into the disperser, add 30 liters of acetone solution dissolved in 500 grams of oleic acid, stir quickly, the speed is 200rpm, and the power is 1.5KW;

[0038] 1.2 After dispersing and coating in the disperser for 40 minutes, take out the material, put it in a hot air oven, and dry it at 95°C for 12 hours;

[0039] 1.3 Take out the dried material and put it into a swinging machine (stainless steel filter mesh with a diameter of 10 mm) for pre-crushing (the electron microscope photo of the raw material after pre-crushing is as follows: figure 1 );

[0040] 1.4 Then, the pre-crushed materials are crushed at a speed of 20 kg per minute by a disc-type airflow mill, and the high-pressure airflow uses compressed air: the crushing pressure is 12 kg, and the feeding pressure is 8 kg; the high-pressure airflow inlet in the tangential direction is 6;

[0041] 1.5 Then collect the crushed material through the collection ba...

Embodiment 2

[0046] 2.1 Take 100 kg of S6 series quasi-spherical silver powder, put it into the disperser, add 40 liters of ethanol and ethylene glycol mixed solvent with 500 grams of saturated fatty acid dissolved in a ratio of 1:1, and stir quickly at a speed of 500 rpm;

[0047] 2.2 After dispersing and coating in the disperser for 90 minutes, take out the material, put it in a vacuum oven, dry it at 85 degrees Celsius for 1 hour, take out the material, put it in a swing machine (the aperture of the stainless steel filter is 5 mm) for pre-crushing, After crushing, put it into the oven to continue drying for 15 hours.

[0048] 2.3 Take out the dried material (at this time, it is the raw material to be crushed, the electron microscope photo is as follows Figure 4 ), using a disc-type airflow mill to crush at a speed of 50 kilograms per minute, and the high-pressure airflow adopts compressed air: the crushing pressure is 11 kilograms, and the feeding pressure is 6 kilograms; there are 8 h...

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Abstract

The invention claims to protect a method for crushing and dispersing spherical and quasi-spherical metal aggregates with micron-scale particle diameters, so as to achieve the effect of separating the agglomerated particle clusters. The method of the invention mainly includes the following main steps: 1. wet dispersion coating, 2. drying and crushing, and 3. collecting system. The crushing and dispersing method of the present invention can effectively open the agglomerates of metal particles and restore the dispersed state of single particles, so that the dispersibility of the product is greatly improved, so that the obtained metal powder product can meet the production of high-end conductive paste.

Description

technical field [0001] The invention belongs to the technical field of metal powder crushing, in particular to a method for crushing and dispersing spherical and quasi-spherical metal powder products. Background technique [0002] Precious metal powders 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 the dispersion of metal powders are getting higher and higher. [0003] Traditional methods of crushing metal powder agglomerates use simple single-hammer mechanical crushing without pretreatment, or high-pressure water flow crushing, which cannot effectively achieve single-particle dispersion for the crushing and dispersion of micron-sized metal powders. In order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04B07B7/086
CPCB07B7/086B22F9/04B22F2009/041B22F1/065B22F1/102
Inventor 龚强
Owner SUZHOU SMART ADVANCED COATING TECH CO LTD
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