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A surface coating method for automatic compression molding of spherical powder

A spherical powder, automatic pressing technology, applied in the field of powder metallurgy, can solve problems such as uneven distribution, low efficiency, and large change in filter element size

Active Publication Date: 2021-05-11
有研纳微新材料(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires manual weighing, manual filling, and manual demoulding, which has the disadvantages of low efficiency and high cost
In addition, because the powder can be loosely packed and accumulated through free flow, resulting in uneven distribution in the mold, there is a large density difference, which often results in large changes in the size of the sintered filter element, severe deformation after demolding, and low yield. cost

Method used

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  • A surface coating method for automatic compression molding of spherical powder
  • A surface coating method for automatic compression molding of spherical powder
  • A surface coating method for automatic compression molding of spherical powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) 80kg of Cu with a particle size of 180μm-250μm 90 sn 10 Put the gas-atomized spherical powder into a mixer with a stirring and heating device. The volume of the mixer is 150L. Set the temperature of the mixer to 80°C. After the temperature rises, turn on the mixer. The powder was heated and stirred for 0.5h.

[0023] (2) Add 320 g of powdered epoxy resin coating agent with a particle size of 50-100 μm into the mixer, keep the mixer at 80° C., and then heat and stir for 2 hours.

[0024] (3) Add 2.4 kg of ethyl acetate as a dispersant to the mixer, keep the mixer at 80°C, mix for 1 hour, then open the vent hole of the mixer, and continue mixing for 2 hours until the dispersant is completely volatilized Stop mixing.

[0025] (4) Break the agglomerated mixture, and sieve through 60 meshes to obtain a spherical powder with a coating layer.

[0026] The forming efficiency of the above method is 12 pieces / minute, and the crushing strength of the obtained filter elemen...

Embodiment 2

[0028] (1) 50kg of Cu89Sn with a particle size of 120μm-180μm 8 Zn 3 Put the gas-atomized spherical powder into a mixer with a stirring and heating device. The volume of the mixer is 150L. Set the temperature of the mixer to 60°C. After the temperature rises, turn on the mixer. The powder was heated and stirred for 0.5h.

[0029] (2) Add 150 g of powdered phenolic resin coating agent with a particle size of 100-150 μm into the mixer, keep the temperature of the mixer at 60° C., and then heat and stir for 2 hours.

[0030] (3) Add 2kg of ethanol as a dispersant to the mixer, keep the mixer at 60°C, mix for 1 hour, then open the vent hole of the mixer, continue mixing for 2 hours, stop mixing after the dispersant is completely volatilized .

[0031] (4) Crush the agglomerated mixture, and sieve through 80 meshes to obtain a mixed spherical powder.

[0032] From figure 1 and figure 2 It can be seen from the figure that the surface of the uncoated powder is smooth and there...

Embodiment 3

[0036] (1) Put 50 kg of 316L stainless steel spherical powder with a particle size of 120 μm-180 μm into a mixer with a stirring and heating device, wherein the volume of the mixer is 150 L, and the temperature of the mixer is set to 100 ° C, After the temperature rises, turn on the mixer and heat and stir the powder for 0.5h.

[0037] (2) Add 500 g of powdered polyurethane coating agent with a particle size of 100-200 μm into the mixer, keep the temperature of the mixer at 100° C., and then heat and stir for 2.5 hours.

[0038] (3) Add 2.5kg of acetone as a dispersant to the mixer, keep the mixer at 100°C, mix for 2 hours, then open the vent hole of the mixer, continue mixing for 2 hours, stop mixing after the dispersant is completely volatilized material.

[0039] (4) Break the agglomerated mixture, and sieve through 60 meshes to obtain a spherical powder with a coating layer.

[0040] The forming efficiency of the above method is 8 pieces / minute, and the crushing strength...

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Abstract

The invention discloses a surface covering method for automatic pressing and forming of spherical powder, which belongs to the technical field of powder metallurgy. In this method, a coating agent and a dispersant are respectively added to the spherical powder by using a heating and stirring mixer, and by controlling the ratio of the coating agent and the dispersing agent and the heating and stirring process, the surface of the spherical powder is evenly coated with a layer of organic matter, and pressed In the process, the organic coating layer is used to carry out the bonding between the particles, and the porous filter element is automatically pressed and formed. The filter element prepared by the method has the characteristics of good formability, no cracking, developed porosity and good sintered dimensional stability.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a surface coating method for automatic pressing and forming of spherical powder. Background technique [0002] At present, powder metallurgy porous filter products are widely used in precision filtration, noise reduction, exchange adsorption and other industries. In order to ensure that filter products have well-developed pores, the traditional process is mostly to fill spherical powder into corresponding molds for high-temperature sintering. This method requires manual weighing, manual filling and manual demoulding, and has the defects of low efficiency and high cost. In addition, because the powder can be loosely packed and accumulated through free flow, resulting in uneven distribution in the mold, there is a large density difference, which often results in large changes in the size of the sintered filter element, severe deformation after demolding, and low yield. c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
CPCB22F1/102
Inventor 徐景杰梁雪冰穆艳如王林山高宇李平祁凤彩
Owner 有研纳微新材料(北京)有限公司
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