Preparation method for spherical dispersion strengthening aluminum bronze powder

A technology for strengthening aluminum and aluminum bronze, which is used in the field of copper alloy powder preparation and surface spraying, can solve the problems of affecting the powder rate, affecting the spraying effect, and failing to generate alumina dispersion, and achieves improved wear resistance, dimensional stability, high The effect of hardness

Active Publication Date: 2019-03-01
DONGGUAN HYPER TECH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are great difficulties in the preparation of dispersion-strengthened aluminum bronze powder by the internal oxidation method: since the aluminum content in aluminum bronze is as high as about 10%, during the internal oxidation process, a dense aluminum oxide passivation film will be preferentially formed on the surface of the powder particles. Prevent the internal oxidation process from continuing, so that the aluminum oxide disperse phase cannot be generated inside the powder; and the presence of an aluminum oxide passivation layer on the surface of the powder particles will also affect the spraying effect and the powder coating rate
Therefore, the conventional internal oxidation method cannot obtain dispersion strengthened aluminum bronze powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a preparation method of dispersion strengthened aluminum bronze spherical powder, comprising the following steps:

[0025] Step 1: Put the aluminum bronze raw material with the brand name QAL9-4 in the graphite crucible of the intermediate frequency melting furnace, melt it in vacuum, and use the nitrogen atomization method to make the aluminum bronze spherical powder. Take the fine powder (-300 mesh) whose particle size distribution is within the range of 15-53 microns;

[0026] Step 2: Put nano-alumina powder (average particle size 30-50 nm) with a weight percentage of 2.5% of aluminum bronze into pure water with a weight percentage of 30% of aluminum bronze, and add surfactant AD18#, the proportion of which is aluminum 0.3%wt of bronze powder forms a colloid after ultrasonic dispersion;

[0027] Step 3: Put the above aluminum bronze powder into the colloidal solution, stir it well, place it together with the liquid in an oven, and dry it at ...

Embodiment 2

[0031] This embodiment provides a preparation method of dispersion strengthened aluminum bronze spherical powder, comprising the following steps:

[0032] Step 1: Put the raw material of aluminum bronze with the brand name QAL9-4 in the graphite crucible of the intermediate frequency melting furnace, vacuum melt, the superheat of the melt is 250-300°C, and use the nitrogen atomization method to make aluminum bronze spherical powder. Take the fine powder (-100+250 mesh) whose particle size distribution is in the range of 50-120 microns;

[0033] Step 2: Put nano-alumina powder (average particle size 30-50 nm) with a weight percentage of 3% of aluminum bronze into pure water with a weight percentage of 25% of aluminum bronze, and add surfactant AD18#, the ratio of which is aluminum 0.2%wt of bronze powder forms a colloid after ultrasonic dispersion;

[0034] Step 3: Put the above aluminum bronze powder into the colloidal solution, stir it well, place it together with the liquid...

Embodiment 3

[0038] This embodiment provides a preparation method of dispersion strengthened aluminum bronze spherical powder, comprising the following steps:

[0039] Step 1: Put the aluminum bronze raw material with the brand name QAL10-4-4 in the graphite crucible of the intermediate frequency melting furnace, melt it in vacuum, and use the nitrogen atomization method to make the aluminum bronze spherical powder. Take the fine powder (-150+300 mesh) whose particle size distribution is in the range of 40-100 microns;

[0040] Step 2: Put nano-zirconia powder (average particle size 20 nm) with a weight percentage of 3% of aluminum bronze into pure water with a weight percentage of 25% of aluminum bronze, and add surfactant AD18#, the ratio of which is aluminum bronze powder 0.2%wt of 0.2%wt, form a colloid after ultrasonic dispersion;

[0041] Step 3: Put the above aluminum bronze powder into the colloidal solution, stir it thoroughly, put it together with the liquid in an oven, and dry ...

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Abstract

The invention belongs to the technical field of copper alloy powder, and particularly relates to a preparation method for spherical dispersion strengthening aluminum bronze powder. The preparation method comprises the following steps that aluminum bronze prealloy raw materials are put in a graphite crucible of a medium-frequency induction furnace, vacuum melting is carried out, and then sphericalaluminum bronze powder is formed through a gas atomization process; nanometer dispersed phase micro powder is put into pure water, meanwhile, an organosilicone type surface active agent is added, andafter ultrasonic dispersion, a colloidal solution is formed in water through nanophases; the spherical aluminum bronze powder is put into the colloidal solution, a mixture is sufficiently stirred andput in a drying oven to be heated and dried; obtained powder is put into a material mixing tank to be mixed, the powder rubs, and then the spherical dispersion strengthening aluminum bronze powder isobtained. Compared with the prior art, a coating prepared through the aluminum bronze powder is compact in structure, dispersed phase particles in nanometer size to submicron size are distributed in the coating, the sizes of the dispersed phase particles are stable, the dispersed phase particles are evenly distributed in a film layer which is obtained through cold spraying and is of a layer structure, and a particle dispersion strengthening effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of copper alloy powder preparation and surface spraying, and in particular relates to a preparation method of dispersion-strengthened aluminum bronze spherical powder. Background technique [0002] Aluminum bronze has high strength, good elasticity, good fatigue resistance, corrosion resistance, wear resistance, low temperature impact resistance and other advantages, and is widely used in machinery, electronics, metallurgy, shipbuilding, marine industry and other fields. As a coating material, aluminum bronze is not only a common surface repair material, but also an excellent soft wear-resistant coating material, which has the advantages of anti-contact wear, anti-cavitation, and excellent dry friction performance. It is used in large ships. It is widely used in propellers, aero-engine components, mechanical transmission shaft components and other fields. However, there are not many ways to further improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00
CPCB22F1/0003B22F9/082
Inventor 李晖云崔宁
Owner DONGGUAN HYPER TECH COMPANY
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