Mixed powder for 3D printing and 3D printing method

A 3D printing and powder mixing technology, applied in the field of metal 3D printing, can solve the problems of large pore space, reduced density of sintered parts, affecting the bulk density of powder bed powder, etc., to achieve high printing green density and increase bulk density. , Improve the effect of powder spreading

Pending Publication Date: 2022-05-27
广东金瓷三维技术有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using spherical powder with a coarse particle size (greater than 10 μm) for powder spreading, due to the good fluidity of the powder, the powder spreading effect is better, but it is also easy to form a large pore space between the coarse particles, which affects the sintering performance and leads to final sintering Part density is significantly reduced
The use of spherical powder with a finer particle size (less than 10 μm) is beneficial to improve the sintering performance and final density of the powder, but the fluidity of the fine powder is poor, and the powder spreading effect is poor; at the same time, the fine powder is at room temperature. Agglomeration is prone to occur under the environment, and the fine powder particles accumulate to form larger irregular particles, which are easy to form larger pores during the powder spreading process, thereby affecting the bulk density of the powder in the powder bed, and further affecting the sintered parts. Density and mechanical properties
At the same time, during 3D printing, the powder on the powder bed and the binder have a process of contacting each other. If the quality of the powder on the powder bed is low and the surface of the powder layer has more pores, it is easy to rearrange the powder particles, which makes More disordered and irregularly distributed pore space between powder particles, resulting in serious printing defects

Method used

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  • Mixed powder for 3D printing and 3D printing method
  • Mixed powder for 3D printing and 3D printing method
  • Mixed powder for 3D printing and 3D printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The 5~7μm 316L stainless steel spherical powder and the 15~43μm 316L stainless steel spherical powder are mixed, the mixing speed is 240rpm, the mixing time is 1.5h, and the mixing powder is dried and mixed at room temperature. The volume ratio of the two is 9:1 ​​to obtain graded spherical or quasi-spherical powder corresponding to the ratio of 9:1.

[0049] a) 3D printing the graded powder. During the printing process, the blanking strength is 80%, the blade speed is 80mm / min, the powder layer thickness is 70μm, the binder saturation is 70%, and the powder bed temperature is 50°C. After printing, the green printed part was subjected to thermal curing treatment, the curing temperature was 200° C., and the curing time was 10 h to obtain the printed part.

[0050] b) Degreasing the printed part, injecting 4MPa argon gas during the degreasing process, the maximum degreasing temperature of 600°C, and the holding time of 60 minutes, to obtain a printed-degreased part.

[0...

Embodiment 2

[0054] The 5~7μm 316L stainless steel spherical powder and the 15~43μm 316L stainless steel spherical powder are mixed, the mixing speed is 240rpm, the mixing time is 1.5h, and the mixing powder is dried and mixed at room temperature. The volume ratio of the two is 10:1 to obtain graded spherical or quasi-spherical powder corresponding to the ratio of 10:1.

[0055] a) 3D printing the graded powder. During the printing process, the blanking strength is 80%, the blade speed is 80mm / min, the powder layer thickness is 70μm, the binder saturation is 70%, and the powder bed temperature is 50°C. After printing, the green printed part was subjected to thermal curing treatment, the curing temperature was 200° C., and the curing time was 10 h to obtain the printed part.

[0056] b) Degreasing the printed part, injecting 4MPa argon gas during the degreasing process, the maximum degreasing temperature of 600°C, and the holding time of 60 minutes, to obtain a printed-degreased part.

[0...

Embodiment 3

[0060] The 5~7μm 316L stainless steel spherical powder and the 15~43μm 316L stainless steel spherical powder are mixed, the mixing speed is 240rpm, the mixing time is 1.5h, and the mixing powder is dried and mixed at room temperature. The volume ratio of the two is 11:1 to obtain graded spherical or quasi-spherical powder corresponding to the ratio of 11:1.

[0061] a) 3D printing the graded powder. During the printing process, the blanking strength is 80%, the blade speed is 80mm / min, the powder layer thickness is 70μm, the binder saturation is 70%, and the powder bed temperature is 50°C. After printing, the green printed part was subjected to thermal curing treatment, the curing temperature was 200° C., and the curing time was 10 h to obtain the printed part.

[0062] b) Degreasing the printed part, injecting 4MPa argon gas during the degreasing process, the maximum degreasing temperature of 600°C, and the holding time of 60 minutes, to obtain a printed-degreased part.

[0...

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Abstract

The invention discloses mixed powder for 3D printing and a 3D printing method.The mixed powder for 3D printing comprises coarse powder and fine powder, the particle size of the coarse powder ranges from 15 micrometers to 43 micrometers, the particle size of the fine powder ranges from 5 micrometers to 7 micrometers, the volume ratio of the coarse powder to the fine powder ranges from 8: 1 to 11: 1, and the particle size of the fine powder ranges from 5 micrometers to 7 micrometers. The coarse powder is selected from at least one of metal powder, and the coarse powder is spherical powder. The fine powder is used for filling pore parts among coarse powder particles, the surface roughness of a powder layer is reduced, the powder laying quality of the 3D printing powder is effectively improved, and therefore better powder stability is achieved; the mixed powder has very high bulk density on a powder bed, so that higher density of a printed green body is obtained, and the final sintering density and mechanical property of a printed piece are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of metal 3D printing, in particular to a mixed powder for 3D printing and a 3D printing method. Background technique [0002] Binder jet printing technology, also known as 3DP technology (Three dimensional printing), is an additive manufacturing technology developed by the Massachusetts Institute of Technology in the early 1990s. The 3DP technology is to selectively spray the binder on the powder bed according to the slicing profile of the three-dimensional model, so that the binder penetrates into the powder layer by layer to form a green part, and then prepares the final target part after curing, powder removal, degreasing, and sintering. The model processing software supporting the 3D printer slices the given 3D model file into a 2D contour file corresponding to the set layer thickness value, which is used as the instruction input of the printer. During the 3D printing process, the powder hopper spreads ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/14B33Y70/00B33Y70/10B22F1/12B22F10/64B22F10/62B22F3/10B22F1/052B33Y10/00B33Y40/20
CPCB22F10/14B33Y70/00B33Y70/10B22F10/64B22F10/62B22F3/1021B33Y10/00B33Y40/20Y02P10/25
Inventor 梁旭浩孟晓燕邓欣刘金洋屈志金枫闫国栋
Owner 广东金瓷三维技术有限公司
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