Strong and weak interface synergistic enhance the mechanical and microwave absorption properties of alumina

Yameng Jiao; Qiang Song; Xu Yang; Ruimei Yuan; Di Zhao; Yuanxiao Zhao; Qingliang Shen; Hejun Li

doi:10.1016/j.jcis.2024.11.044

Strong and weak interface synergistic enhance the mechanical and microwave absorption properties of alumina

J Colloid Interface Sci. 2024 Nov 9;680(Pt A):1007-1015. doi: 10.1016/j.jcis.2024.11.044. Online ahead of print.

Authors

Yameng Jiao¹, Qiang Song², Xu Yang¹, Ruimei Yuan³, Di Zhao⁴, Yuanxiao Zhao¹, Qingliang Shen⁵, Hejun Li⁶

Affiliations

¹ State Key Laboratory of Solidification Processing, Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an 710072, China.
² State Key Laboratory of Solidification Processing, Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: songqiang511@nwpu.edu.cn.
³ Academy of Advanced Interdisciplinary Research, Xidian University, China.
⁴ State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.
⁵ State Key Laboratory of Solidification Processing, Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: shenqingliang@nwpu.edu.cn.
⁶ State Key Laboratory of Solidification Processing, Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: lihejun@nwpu.edu.cn.

PMID: 39549345
DOI: 10.1016/j.jcis.2024.11.044

Abstract

Multifaceted balance makes the design of ceramics difficult but is urgently needed. This work purposes to grow uniform edge-rich graphene (ERG) on alumina (Al₂O₃/ERG) in-situ, then constructs a discontinuous conductive, strengthening and toughening network of crosslinked ERG by mixing Al₂O₃/ERG with Al₂O₃ and sintering. Under the guarantee of the tight-bound covalent interface, ERG and doping Al₂O₃ strengthen and toughen the ceramic by synergistic effect of weak and strong interface. And doping Al₂O₃ interrupts the conductive network of ERG to improve the impedance matching and endow material with moderate electromagnetic wave (EMW) loss capacity. The optimal flexural strength and fracture toughness of the composite ceramic reach 333.04 MPa and 12.43 MPa⋅m^1/2, respectively. Meanwhile, it can absorb 80 % or more of the incident EMW in X-band with a matching thickness of 2 mm. This work takes full advantage of ERG to prepare load-bearing EMW absorbing ceramics, which expands the idea for material design.

Keywords: Crosslinked interface; Edge-rich graphene; Interface interlock; Microwave absorption; Strengthen and toughen.