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A metal powder for 3D printing, its preparation method and 3D printing method

A 3D printing and metal powder technology, which is applied in the field of metal powder and its preparation, can solve the problems of low density, unfavorable high-density parts, and many pores, and achieve the effect of high density and increased density

Active Publication Date: 2017-10-10
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the 3D printing process of micro-jet bonding, due to the low density of the bonded body after degreasing, there are many pores, and a considerable part of the pores still exist during the sintering process, which makes this process not conducive to obtaining high density. parts

Method used

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Examples

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Effect test

preparation example Construction

[0016] This specific embodiment provides a method for preparing metal powder for 3D printing, which includes the following steps: using iron-based alloy powder with a particle size in the range of 20 to 60 microns as the matrix, and using an iron-based alloy powder with a particle size in the range of 50 nanometers to 50 nanometers. Iron oxide powder and carbon powder in the range of 2 microns are used as additives and mixed evenly to obtain metal powder. The mass ratio of the iron oxide powder and carbon powder is in the range of 4.4:1 to 8.8:1, and the mass ratio of the sum of the mass of the iron oxide powder and carbon powder to the mass of the iron-based alloy powder is 1: In the range of 100~1:400. Wherein, the iron-based alloy powder is a mixture of one or more of stainless steel, die steel, and iron-nickel alloy.

[0017] The metal powder prepared above is applied to the 3D printing process, and the metal powder is first printed by the 3D printing method of micro-jet ...

Embodiment 1

[0028] Metal powder contains the following components: stainless steel 316L powder, iron oxide powder and carbon powder. Wherein, the particle size of the stainless steel powder is in the range of 20-50 microns, D50=36 microns, and the shape is spherical. The particle diameter of the iron oxide powder is in the range of 100-200 nanometers, the particle diameter of the carbon powder is in the range of 50-100 nanometers, and the shape is spherical. The mass ratio of iron oxide to carbon powder is 4.4:1. The mass ratio of the sum of the mass of iron oxide and carbon powder to the mass of stainless steel powder is 1:300.

[0029] The above-mentioned powders are fully mixed evenly by high-speed grinding to obtain a composite metal molding powder. A 5×5×5mm metal molding powder is obtained by spraying the binder micro-droplets of polyvinylpyrrolidone (PVP) aqueous solution layer by layer, and then superimposing the metal powder layer by layer. 3 Three-dimensional bonded body of c...

Embodiment 2

[0036] Metal powder contains the following components: stainless steel 304 powder, iron oxide powder and carbon powder. Wherein, the particle size of the stainless steel powder is in the range of 30-60 microns, D50=40 microns, and the shape is spherical. The particle size of iron oxide powder and carbon powder is in the range of 100-200 nanometers, the particle size of carbon powder is in the range of 50-100 nanometers, and the shape is spherical. The mass ratio of iron oxide and carbon powder is 5:1. The mass ratio of the sum of the mass of iron oxide and carbon powder to the mass of stainless steel powder is 1:280.

[0037] The above-mentioned powders are fully mixed evenly by high-speed grinding to obtain a composite metal molding powder. A 5×5×5mm metal molding powder is obtained by spraying the binder micro-droplets of polyvinyl alcohol (PVA) aqueous solution layer by layer, and then superimposing the metal powder layer by layer. 3 Three-dimensional bonded body of cubi...

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Abstract

The invention discloses a metal powder material for 3D printing, a preparation method of the metal powder material and a 3D printing method. The preparation method of the metal powder material for 3D printing comprises the following steps that iron-base alloy powder with the grain sizes ranging from 20 micrometers to 60 micrometers is used as a base body, iron oxide powder and carbon powder with the grain sizes ranging from 50 nanometers to 2 micrometers are used as additives, the powder is evenly mixed, and the metal powder material is obtained; the mass ratio of the iron oxide powder and the carbon powder is within the range of 4.4:1-8.8:1, and the ratio of the sum of the mass of the iron oxide powder and the mass of the carbon powder to the mass of the iron-base alloy powder is within the range of 1:100-1:400. After the metal powder material is prepared, the metal powder material is printed to be a three-dimensional blank through a micro-jetting bonding 3D printing method; the three-dimensional blank is subjected to degreasing sintering, the sintering temperature is no lower than 900 DEG C, and a 3D printing product is obtained. The metal powder material is used in the 3D printing method, and therefore the obtained printing product is high in compactness.

Description

【Technical field】 [0001] The invention relates to a metal powder and a preparation method thereof, in particular to a metal powder for 3D printing, a preparation method thereof and a 3D printing method. 【Background technique】 [0002] Among the many materials for 3D printing, metal materials are the most widely used materials. At present, the 3D printing methods of metal materials mainly include selective laser sintering, direct energy deposition, micro jet bonding and so on. In contrast, the cost of micro-jet bonding is low, the process is relatively simple, and it has a good application prospect. This method is to use the nozzle to spray the adhesive on the laid metal powder according to a certain path, and bond the powder at a certain position to form a layer of three-dimensional component outline. Then lay a new layer of metal powder, and spray bonding. Such multi-layer bonding and superimposition can obtain a three-dimensional bonded green body. The bonded body has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/105B22F3/115
Inventor 闫国栋王长明叶春生赵火平
Owner DONGGUAN HUAJING POWDER METALLURGY
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