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Accuracy controlling and mechanical behaviors of precursor-derived ceramic SiOC microlattices by projection micro stereolithography(PμSL)3D printing

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Journal of Advanced Ceramics 2023年第11期12卷 2134-2147页

作者： Ruyue Su Jingyi Chen Xueqin Zhang Xiong Gao Wenqing Wang Ying Li Rujie He State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structure Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China

Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical properties.However,the printing accuracy of the PDC-SiOC microlattices by 3D printing is still limited,and mechanical properties of the PDC-SiOC microlattices have not been studied systematically.Here,PDC-SiOC octet microlattices were fabricated by projection micro stereolithography(PμSL)3D printing,and photoabsorber(Sudan III)’s effect on the accuracy was systematically analyzed.The results showed that the addition of Sudan III improved the printing accuracy significantly.Then,the ceramization process of the green body was analyzed in detail.The order of the green body decreased,and most of their chemical bonds were broken during pyrolysis.After that,the PDC-SiOC microlattices with different truss diameters in the range of 52–220μm were fabricated,and their mechanical properties were investigated.The PDC-SiOC microlattices with a truss diameter of 52μm exhibited higher compression strength(31 MPa)than those with bigger truss diameters.The size effect among the PDC-SiOC microlattices was analyzed.Our work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of the size effect in ceramic structures.

关键词： precursor-derived ceramic(PDC) microlattice projection micro stereolithography(PμSL) accuracy mechanical behaviors

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Additively manufactured heterogeneously porous metallic bone with biostructural functions and bone-like mechanical properties

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Journal of Materials Science & Technology 2021年第3期62卷 173-179页

作者： Pan Wang Xinwei Li Shumin Luo Mui Ling Sharon Nai Jun Ding Jun Wei Singapore Institute of Manufacturing Technology A*STAR73 Nanyang Drive637662Singapore Department of Materials Science and Engineering National University of Singapore117576Singapore

A compatible artificialbone impla nt requires large pores for enhanced nutrients transports,small pores to allow cell seeding and bone-like mechanical properties to avoid stress shielding.Herein,we report novel improved gyroid lattices with millimetre-scaled gyroid wall spacings and micrometre-scaled additional pores on the walls.Designs are successfully fabricated by electron beam melting using Ti-6 Al-4 V to high part qualities while exhibiting bone-like mechanical properties with a range of Young's modulus of 8-15 GPa and strength of 150-250 MPa.The improved design also eliminates brittle failure by allowing the structure to deform more stably.

关键词： microlattice Metallic bone Implant Electron beam melting 3D printing

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Optimizing film thickness to delay strut fracture in high-entropy alloy composite microlattices

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International Journal of Extreme Manufacturing 2021年第2期3卷 107-112页

作者： James Utama Surjadi Xiaobin Feng Wenzhao Zhou Yang Lu Department of Mechanical Engineering City University of Hong KongKowloonHong Kong Special Administrative Region of China Nano-Manufacturing Laboratory(NML) City University of Hong Kong Shenzhen Research InstituteShenzhen 518057People’s Republic of China

Incorporating high-entropy alloys(HEAs) in composite microlattice structures yields superior mechanical performance and desirable functional properties compared to conventional metallic lattices. However, the modulus mismatch and relatively poor adhesion between the soft polymer core and stiff metallic film coating often results in film delamination and brittle strut fracture at relatively low strain levels(typically below 10%). In this work, we demonstrate that optimizing the HEA film thickness of a CoCrNiFe-coated microlattice completely suppresses delamination,significantly delays the onset of strut fracture(~100% increase in compressive strain),and increases the specific strength by up to 50%. This work presents an efficient strategy to improve the properties of metal-composite mechanical metamaterials for structural applications.

关键词： high-entropy alloy microlattice mechanical metamaterials microstructure thin film

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