Ye Xiaohui, PhD, associate professor. She holds a PHD degree in Materials Science and Engineering from Tsinghua University. She currently works at School of Material Science and Engineering, Shaanxi University of Science and Technology. Her research interests encompass laser micro/nano manufacturing, fabrication and application of 2D functional materials, nano structure based sensors for pressure, temperature, moisture and gas detecting and wearable electronic device based on 2D functional materials. She published 20 peer-reviewed papers in Nature Communication, Advanced Materials Technologies, Carbon, RSC Advances, Scientific Reports etc. She hosts 1 national project (NSF), 1 province project, and 6 internal projects.
Speaker-Xiaohui Ye
Title：Laser induced graphene regrowth for self-repairing application
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Abstract
Graphene has incomparable advantages in metal friction and wear protection due to its excellent lubricity, chemical stability and mechanical properties. Due to the nanoscale thickness of graphene, it will disappear within a very short time after friction, which is a constraint on the graphene film as a wear-resistant coating. In this paper, the in-situ self-repairing graphene/carbon-rich metal matrix self-lubricating composite system was designed to solve the above problems. The graphene film can be grown on metal surface by laser processing, and amount of carbon source can be penetrated into the metal substrate. If the graphene on the surface was worn out, the carbon source can be re-separated out to the surface from the substrate under the force of metastable supersaturated solid solution and the heat generated by the friction. The carbon source can be meet each other, and then form to the new graphene film to repair the damaged area. This self-repaired material gives full play to the advantages of ultra-low friction coefficient between graphene sheets, and can greatly improve the mechanical strength of the material after laser remelting. It can provide reliable wear protection for metal parts, and experimental basis and theoretical basis for the upgrade and transformation of China's precision instrument industry.
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