Effect of reuse on Cu-Cr-Nb powder and bulks produced by laser powder bed fusion

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-14 DOI:10.1016/j.powtec.2025.120930

Zixiang Dai , Xuyan Chen , Yingquan Liu , Jie Wang , Junyong Lu , Jiabin Liu

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引用次数: 0

Abstract

Cu-Cr-Nb, a high-strength, high-conductivity copper alloy for high-temperature applications, has gained importance in aerospace components used in extreme thermal environments. Laser additive manufacturing has become the predominant method for preparing Cu-Cr-Nb alloy components. In the typical additive manufacturing process, not all metal powder is utilized in the product formation, enabling reuse to reduce material costs effectively. This study investigated the recyclability of Cu-Cr-Nb powder in laser powder bed fusion and its impact on both the powder and the printed bulks. Compared to virgin powder, recycled powder exhibited extensive spatters, agglomerations, and a broadened particle size distribution, while its overall composition remained nearly unchanged. The increased oxygen content changed the chemical properties of the powder surface and resulted in a decrease in laser reflectivity. Findings indicated an expansion in the range of powder particle size distribution and an increase in oxygen content from 0.053 % to 0.143 % after six cycles, along with a 15.0 % decrease in reflectance. These alterations corresponded with a reduction in the melt pool's width-to-depth ratio, increased porosity, and lowered density, significantly affecting the relative ductility, whereas hardness and tensile strength remained largely unaffected. This research offers vital insights into employing recycled powder for copper alloys and also underscores the necessity for different recycling strategies across various alloy systems.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.