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Development and Evaluation of multiscale Fiber-reinforced Composite Powders for Powder-bed Fusion Process

Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第2期2卷 43-53页

作者： Zhihao Wang Meixin Zhou Heye Xiao Shangqin Yuan Institute of Intelligence Material and Structure Unmanned System Research InstituteNorthwestern Polytechnical UniversityXi’an710072China State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an710072China Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore

The development of multiscale fiber-reinforced composite powders is an effective way to improve the mechanical properties and functionality of additively manufactured parts.Herein,a novel thermally induced precipitation process is proposed for preparing multiscale fiber-reinforced powders.A systematic evaluation was conducted to explore the main factors influencing powder morphology,powder flow,and microstructure.In the powder-forming mechanism,the polymer matrix is coated on the microfiber,and a film of carbon nanotubes covers the powder surface,which is promoted by heterogeneous nucleation.The composite powders comprised polyamide 12,carbon fiber(CF),and carbon nanotubes,which have been successfully applied in powder bed fusion processes including selective laser sintering(SLS).Smooth flow and powder deposition were observed,and the composite components obtained via SLS were well-fabricated using the optimized process parameters.A CF loading ratio of up to 66.7 wt%and homogeneous fiber distribution within the matrix were successfully achieved.

关键词： Fiber-reinforced composite powder multi-scale fibers Powder bed fusion Selective laser sintering

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