High bulk density carbonyl iron powder for 3D printing and preparation method thereof

Abstract

The invention discloses a high bulk density carbonyl iron powder for 3D printing and a preparation method thereof. The powder is characterized in that the powder is prepared by uniformly mixing spherical carbonyl iron powder with three different granularities (coarse, medium and fine), wherein the granularity range of the coarse powder is 75-150 [mu]m, the granularity range of the medium powder is10-25 [mu]m, and the granularity of the fine powder is less than 5 [mu]m, and the proportions of the coarse powder, the medium powder and the fine powder are respectively 55-65%, 10-30% and 5-35%. The powder can be prepared by using thermal cracking process of iron pentacarbonyl; slurry can be prepared by uniformly stirring and mixing the classified carbonyl iron fine powder, an organic binder and an organic solvent; the coarse powder and the medium powder can be obtained from the metal slurry through spray granulation and classifying; and the high bulk density carbonyl iron powder can be obtained after the coarse powder, the medium powder and the fine powder are uniformly mixed by the above proportions. Compared with the prior art, the prepared powder is high in sphericility, good in fluidity, large in bulk density, simple in production process and suitable for large-scale production, and thus, the demands of 3D printing on high performance metal powder can be met.

Description

technical field [0001] The invention belongs to the field of metal powder raw materials for 3D printing, and specifically relates to a high bulk density carbonyl iron powder for 3D printing and a preparation method thereof. Background technique [0002] Metal 3D printing is one of the fastest growing and most promising technologies, with successful applications in aircraft engine components, medical implants, automotive components, aerospace satellite components, and more. The metal materials used in 3D printing are mainly powder and wire, among which powder raw materials can be used in more abundant 3D printing processes, so the demand for 3D metal powder is extremely urgent. Metal 3D printing has different requirements for various indicators of powder materials than traditional powder metallurgy. Therefore, the metal powder materials used in traditional powder metallurgy cannot fully meet the requirements of 3D printing technology. [0003] The existing methods for prepar...

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Problems solved by technology

[0004] From the investigation of the existing technology, it can be known that the metal powder prepared by the atomization method has a large original particle size, low bulk density, and slow melting speed, which cannot meet the requirements of fast 3D printing; The chemical granulation process prepares metal powders with a particle size of 10-50 microns, and the powder bulk density is low, which cannot meet the requirements of 3D printing for high bulk density of metal powders.

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