Additive manufacturing of gradient porous Si/SiC ceramic parts: Quasi-static behaviors and mechanical properties

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-11-13 DOI:10.1016/j.compstruct.2024.118693

Ce Sun , Song Zhang , Rong Tu , Lihong Wu , Jiahao Ye , Yusheng Shi , Chunze Yan , Huajun Sun , Yuhan Liao , Peng Chen , Kai Liu

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引用次数: 0

Abstract

Porous silicon carbide (SiC) ceramic exhibits low density, high toughness, which endow it with an indispensable role in engineering applications. However, the manufacturing, designing, and making full use of the rich pore structure of gradient porous SiC ceramic to improve its mechanical performance still face many challenges. Herein, the manufacture of gradient porous Si/SiC ceramic part is realized for the first time, and the influence of gradient structural on mechanical properties is deeply analyzed. The results indicate that the porous Si/SiC ceramics with constant gradient transition rate is characterized by step-by-step destruction and can carry larger strains than the porous Si/SiC ceramics with non-constant gradient transition rate. Meanwhile, reducing the gradient span can improve the strength, but it is easy to lead to brittle damage. In particular, gradient porous Si/SiC ceramics with constant gradient transition rate and 30 % gradient span can exhibit both good strength and toughness. The compressive strength can reach 11.71 MPa, and the equivalent elastic modulus can reach 2.28 GPa. Finally, a laminar material prediction model for mechanical properties is presented. This paper presents an effective fabrication method for gradient porous ceramic parts and provides a feasible means for the design and prediction of mechanical properties.

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梯度多孔硅/碳化硅陶瓷部件的增材制造：准静态行为和机械性能

多孔碳化硅（SiC）陶瓷具有低密度、高韧性的特点，在工程应用中发挥着不可或缺的作用。然而，如何制造、设计和充分利用梯度多孔碳化硅（SiC）陶瓷丰富的孔隙结构来提高其机械性能仍面临诸多挑战。本文首次实现了梯度多孔 Si/SiC 陶瓷部件的制造，并深入分析了梯度结构对力学性能的影响。结果表明，与梯度转换率不恒定的多孔 Si/SiC 陶瓷相比，梯度转换率恒定的多孔 Si/SiC 陶瓷具有逐级破坏的特点，能承受更大的应变。同时，减小梯度跨度可以提高强度，但容易导致脆性破坏。特别是梯度转换率恒定、梯度跨度为 30% 的梯度多孔 Si/SiC 陶瓷，可以同时表现出良好的强度和韧性。抗压强度可达 11.71 MPa，等效弹性模量可达 2.28 GPa。最后，介绍了层状材料的力学性能预测模型。本文提出了一种有效的梯度多孔陶瓷部件制造方法，并为机械性能的设计和预测提供了一种可行的手段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.