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A kind of low laser reflectance powder particle and preparation method

A technology of powder particles and laser reflection, applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of reducing block properties, destroying the sphericity of matrix powder, etc. simple effect

Active Publication Date: 2019-06-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to mix the base powder and the additive powder evenly, mechanical ball milling is usually used, and the hard balls are used to grind and stir the powder through the high-speed rotation of the ball mill. The violent collisions accompanied by this process will seriously damage the sphericity of the base powder, thereby reducing the after-molding. block performance

Method used

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  • A kind of low laser reflectance powder particle and preparation method
  • A kind of low laser reflectance powder particle and preparation method
  • A kind of low laser reflectance powder particle and preparation method

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preparation example Construction

[0022] A method for preparing powder particles with low laser reflectivity, preparing the powder particles with low reflectivity as described above, characterized in that the steps of preparation are as follows:

[0023] 1. Powder washing: Weigh the raw materials according to the proportion of adding at least 10ml of absolute alcohol to 1g of spherical core, put the spherical core and absolute alcohol into a beaker and mix, ultrasonically mix for at least 20min, let stand for at least 30min, pour off the alcohol solution, put Dry in a vacuum oven with a vacuum degree of at least 10Pa and a temperature of 60°C to 120°C for at least 1 hour;

[0024] 2. Preparation of nano catalyst particles:

[0025] 2.1. After the oven temperature drops to room temperature, take out the beaker, add distilled water at the ratio of 50ml to 100ml of distilled water to 1g of spherical core, and add catalyst precursor at the ratio of 0.03g to 0.09g of catalyst precursor to 1g of spherical core. Cata...

Embodiment 1

[0033] 1. Powder washing: Add 10g of 300-mesh aluminum powder into a beaker filled with 100ml of absolute alcohol, mix it ultrasonically for 20 minutes, let it stand for 30 minutes, pour off the alcohol solution, and dry it in a vacuum oven with a vacuum degree of 10Pa and a temperature of 60°C, dry for 2 hours;

[0034] 2. Preparation of nano catalyst particles:

[0035] 2.1. After the oven temperature drops to room temperature, take out the beaker, add 500ml of distilled water and 0.09g of aluminum nitrate nonahydrate, and stir for 30 minutes;

[0036] 2.2. Then slowly drop in ammonia solution with a concentration of 20% until the pH value of the solution reaches neutrality, and let it stand for 2 hours to form a suspension;

[0037] 2.3. Put the suspension into a centrifuge for centrifugation for 2 minutes, then wash with distilled water; centrifuge and wash twice again;

[0038] 2.4. Take out the precipitate and put it in a vacuum oven with a vacuum degree of 10Pa, a tem...

Embodiment 2

[0042] 1. Powder washing: Add 20g of 100 mesh nickel-based superalloy powder into a beaker filled with 200ml of absolute alcohol, mix it ultrasonically for 20 minutes, let it stand for 30 minutes, pour off the alcohol solution, put it in a vacuum oven for drying, and the vacuum degree of the oven is 10Pa , the temperature is 120 ℃, drying 1h;

[0043] 2. Preparation of nano catalyst particles:

[0044] 2.1. After the oven temperature drops to room temperature, take out the beaker, add 1000ml of distilled water and 0.06g of nickel nitrate hexahydrate, and stir for 30 minutes;

[0045] 2.2. Then slowly drop in ammonia solution with a concentration of 30% until the pH value of the solution reaches neutrality, and let it stand for 2 hours to form a suspension;

[0046] 2.3. Put the suspension into a centrifuge for centrifugation for 2 minutes, then wash with distilled water; centrifuge and wash again for 3 times;

[0047] 2.4. Take out the precipitate and put it in a vacuum oven...

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Abstract

The invention belongs to surface treatment technology, and relates to powder particles with high sphericity and low reflectivity and a preparation method. The powder particle of the present invention has a spherical inner core and a graphite flake coating layer covering the surface of the spherical inner core, the spherical inner core is aluminum powder particles, copper powder particles or nickel-based superalloy powder particles; the thickness of the graphite flake coating layer is 100nm ~5um. The preparation steps of the powder particles of the present invention are: powder washing; preparation of nanometer catalyst particles; and deposition of graphite flakes. The invention proposes a powder particle with high sphericity and low reflectivity and a preparation method, which can maintain the high sphericity of the particle core under the premise of reducing the laser reflectivity, thereby ensuring the block after powder metallurgy molding such as 3D printing performance.

Description

technical field [0001] The invention belongs to surface treatment technology, and relates to powder particles with high sphericity and low reflectivity and a preparation method. Background technique [0002] Due to their excellent mechanical, thermal and electrical properties, composite materials are widely used in aerospace, machinery, transportation, electronics, medicine and other fields. With the continuous development of the breadth and depth of material application, higher requirements are put forward for its preparation process and performance. Powder metallurgy is one of the most commonly used technologies for preparing composite materials. This technology uses single or composite powders as raw materials to produce blocks through molding and sintering processes. Traditional molding methods include hot pressing sintering and discharge plasma sintering. In recent years, 3D printing and laser technology have become more mature, and a new molding method called laser ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C16/26C23C16/02C23C16/505B33Y70/00
CPCC23C16/0272C23C16/26C23C16/4417C23C16/505B33Y70/00B22F1/065B22F1/16
Inventor 周海涛刘大博罗飞罗炳威田野陈冬生
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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