Nacre-mimetic alternating architecture of Ag SnO2 contact: Highly-efficient synergistic enhancement of in-situ self-repairing erosion resistance and naturally evolving impact resistance

• DOI: 10.1016/j.jmat.2024.06.009
• Publication Date: 2024-07-20T15:56:42Z
• Authors: Changhu Xu; Kai Wen; Zhe Wang; Jun Wang; Hailin Lu; Zesen Mao; Tianci Mao; Chongqing Fan; Jun Li
• Keywords: Contact resistance

Synergistically enhancing the erosion and impact resistance of contacts poses a significant challenge for cutting-edge electrical equipment. Fortunately, mollusk shells in nature have evolved effective strategies to construct microstructures with superior resistance. Inspired by structure nacre, Ag-SnO2 contact material hierarchical architectures has been designed fabricated. The mechanistic link between microstructural evolution dynamic is studied through experiments combined Computational Fluid Dynamics (CFD) Finite Element Method (FEM) simulations. Results show that reconstructed SnO2 skeleton endowed highly continuous anisotropic 'flowering'-like forms interpenetrating network Ag, optimizing conductive pathways on molten pool surface. Additionally, Ag-rich regions deeper layers both sides offers stable 'nutrient-supply' 'flowering' reconstruction skeleton, exhibiting excellent in-situ self-repairing Benefiting from this synergistic strategy, based its natural structure, which further disperses stress deformation concentration while inhibiting interfacial debonding, thereby reducing formation cracks significantly This work expected breakthrough extreme condition materials biomimetic microstructure design.