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
CN114535596APending Publication Date: 2022-05-27广东金瓷三维技术有限公司 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
广东金瓷三维技术有限公司
Publication Date
2022-05-27

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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.
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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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