Surface modified metal powder with high laser reflectivity and 3D printing method

A technology of laser reflection and surface modification, which is applied in the 3D printing of copper and powder after surface modification, the surface modification coating of aluminum alloy or copper alloy powder, and the aluminum field, which can solve the problem of many pores and defects, laser Problems such as high reflectivity and poor molding ability can achieve the effect of low production cost, simple process and reduced defects

Inactive Publication Date: 2019-05-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of high laser reflectivity metal powder in the 3D printing process, such as high laser reflectivity, poor forming ability, many pores and defects, and poor mechanical properties.

Method used

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  • Surface modified metal powder with high laser reflectivity and 3D printing method
  • Surface modified metal powder with high laser reflectivity and 3D printing method
  • Surface modified metal powder with high laser reflectivity and 3D printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Prepare nickel-phosphorus-coated pure aluminum surface modification coating powder with nickel content of about 5% and phosphorus content of about 0.5%, and the molar concentration of sodium citrate, nickel chloride, and sodium hypophosphite in the plating solution Respectively 0.15mol / L, 0.15mol / L and 0.3mol / L, calculate the sodium citrate that needs to add in the plating solution, nickel chloride, the quality of sodium hypophosphite is respectively 63.97g, 51.69g and 46.11g, All are analytically pure. Put sodium citrate and nickel chloride into two beakers and dissolve them with 700mL of deionized water, then pour the nickel chloride solution into the sodium citrate solution, and keep stirring to make them fully complexed. Put the electronic pH meter into the beaker containing the mixed solution, add 3mol / L NaOH solution while stirring, adjust the pH to 11~12, add deionized water until the volume of the plating solution reaches 1450mL, put sodium hypophosphite Add...

Embodiment 2

[0046] The difference between this Example 2 and Example 1 is that the reducing agent is changed from sodium hypophosphite to sodium borohydride, that is, to change the trace elements in the metal coated on the surface of aluminum or aluminum alloy powder, and to change the nickel-phosphorous Change to nickel-boron coating with about 3% nickel and 0.3% boron. Other main parameters are changed as follows: the molar concentrations of sodium citrate, nickel chloride and sodium borohydride are 0.095mol / L, 0.095mol / L and 0.2mol / L, and the sodium citrate, chloride The masses of nickel and sodium borohydride are 22.58g, 27.94g and 10.97g respectively. The complexing agent and metal salt were dissolved in 400mL of deionized water respectively, the concentration of the added KOH alkaline solution was 2mol / L, the pH was adjusted to 9-10, the final volume of the plating solution was 950mL, and the reducing agent was prepared as 50mL. Add 100g of pure aluminum powder with a particle size...

Embodiment 3

[0049] The difference between this embodiment 3 and embodiment 1 is that the metal salt is changed from nickel chloride to ferrous sulfate, and the reducing agent is changed from sodium hypophosphite to hydrazine hydrate, that is, the surface coating of aluminum or aluminum alloy powder is changed. The content of metals and their trace elements is changed from coated nickel phosphorus to coated pure iron, and the iron content is about 0.1%. In addition, when using hydrazine hydrate as a reducing agent, due to the toxicity of hydrazine hydrate, it is necessary to take corresponding protective measures, wear a gas mask, protective glasses and gloves, and pass the generated waste gas into a dilute hydrogen peroxide solution to react the hydrazine hydrate vapor and then discharge it. into the atmosphere. Other main parameters are changed as follows: the molar concentrations of sodium citrate, ferrous sulfate, and hydrazine hydrate are 0.005mol / L, 0.005mol / L and 0.01mol / L, and the ...

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Abstract

The invention belongs to the field of metal material preparation, and relates to surface modified metal powder with high laser reflectivity and the application of the surface modified metal powder in3D printing. According to the surface modified metal powder with high laser reflectivity and the application of the surface modified metal powder in 3D printing, nickel, cobalt or iron metal particleswith high laser absorptivity wrap the surface of aluminum, copper and aluminum alloy or copper alloy powder with high laser reflectivity by means of electroless plating, namely, the powder with highlaser reflectivity is modified into the powder with high laser absorptivity, so that the printing performance of the metal powder with high laser reflectivity in the 3D printing process is enhanced, and the 3D printing of the metal powder with high laser reflectivity can be realized. Compared with that of conventional commercial aluminum, copper and aluminum alloy or copper alloy powder used for 3D printing, the laser absorptivity and printing performance are improved after surface modification wrapping, the sphericity of the powder does not change a lot, the powder spreading process is not affected, and printed metal parts are compact and have good mechanical properties.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and relates to a surface-modified metal powder with high laser reflectivity and a 3D printing method, in particular to a surface-modified package of aluminum, copper, aluminum alloy or copper alloy powder with high laser reflectivity coating, and the 3D printing method of powder after surface modification. Background technique [0002] Selective Laser Melting (SLM) is a typical additive manufacturing technology (Additive Manufacturing, AM), commonly known as 3D printing. This technology uses a laser to selectively melt the metal powder bed layer by layer, and then accumulates layer by layer to finally form metal parts. It can realize the manufacture of complex thin-walled precision components that are difficult to achieve with traditional processing technologies. It has the advantages of high forming accuracy and excellent mechanical properties. . In addition, 3D printers that use lase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/32C23C18/52B22F3/105B33Y70/00B33Y10/00B22F1/05B22F1/065B22F1/145B22F1/17
CPCY02P10/25B33Y10/00B33Y70/10B22F7/008B22F7/06B22F9/24C23C18/50C22C1/0416C22C1/0425B22F2998/10C23C18/1637C23C18/1635C23C18/1658C23C18/34C23C18/36B22F1/05B22F1/065B22F1/145B22F1/17B22F10/28B22F10/36B22F10/366B22F10/32B22F10/34B22F10/20C23C18/32C23C18/16
Inventor 杨亚锋耿康李少夫
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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