TY - JOUR
T1 - Internal and external MoS2/GO heterostructure enhanced multi-point contact egg-box inspired SiOC for macroscopic ultra-low friction
AU - Zhao, Yu
AU - Yang, Long
AU - Liu, Yang
AU - Li, Yunyu
AU - Xie, Guangyin
AU - Chang, Peng
AU - Mei, Hui
AU - Cheng, Laifei
AU - Zhang, Litong
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/3
Y1 - 2024/3
N2 - Superlubricity, as a tribological state in which friction and wear virtually disappear, has aroused strong scientific interest. However, scaling superlubricity from nano/micro-scale to macroscale still remains a challenge, owing to the increase in surface defects and elastic deformation under large contact areas. Herein, inspired by egg-box foams, 3D-printed SiOC–MoS2/GO structural lubricating composites were developed by introducing MoS2/GO heterostructure into the interior and surface of well-designed SiOC structures. The 3D highly rigid egg-box like SiOC structures enable an ingenious transformation from macroscopic planar contact to microscopic point contact and a powerful reduction of surface elastic deformation, while 2D MoS2/GO heterostructure ensures the establishment of sustainable incommensurability, thereby improving the macroscopic lubrication performance. As expected, the egg-box like structure with a curvature of 1.57 achieves a minimum wear depth of 1.22 × 10−7 mm. Meanwhile, the corresponding structural composites containing MoS2/GO both inside and outside realize a stable ultra-low friction coefficient of 0.09 in 18,000 reciprocating cycles under dry sliding conditions. The high hardness, multi-point contact, and continuous incommensurable interfaces are responsible for such extraordinary lubricity, according to the finite element calculation and experimental analyses. Admittedly, this work opens up a promising avenue for accelerating the application of superlubricity in future industrial systems.
AB - Superlubricity, as a tribological state in which friction and wear virtually disappear, has aroused strong scientific interest. However, scaling superlubricity from nano/micro-scale to macroscale still remains a challenge, owing to the increase in surface defects and elastic deformation under large contact areas. Herein, inspired by egg-box foams, 3D-printed SiOC–MoS2/GO structural lubricating composites were developed by introducing MoS2/GO heterostructure into the interior and surface of well-designed SiOC structures. The 3D highly rigid egg-box like SiOC structures enable an ingenious transformation from macroscopic planar contact to microscopic point contact and a powerful reduction of surface elastic deformation, while 2D MoS2/GO heterostructure ensures the establishment of sustainable incommensurability, thereby improving the macroscopic lubrication performance. As expected, the egg-box like structure with a curvature of 1.57 achieves a minimum wear depth of 1.22 × 10−7 mm. Meanwhile, the corresponding structural composites containing MoS2/GO both inside and outside realize a stable ultra-low friction coefficient of 0.09 in 18,000 reciprocating cycles under dry sliding conditions. The high hardness, multi-point contact, and continuous incommensurable interfaces are responsible for such extraordinary lubricity, according to the finite element calculation and experimental analyses. Admittedly, this work opens up a promising avenue for accelerating the application of superlubricity in future industrial systems.
KW - 3D printing
KW - Ceramic matrix composites
KW - MoS/GO heterostructure
KW - Ultra-low friction
UR - http://www.scopus.com/inward/record.url?scp=85184521999&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2024.118908
DO - 10.1016/j.carbon.2024.118908
M3 - 文章
AN - SCOPUS:85184521999
SN - 0008-6223
VL - 221
JO - Carbon
JF - Carbon
M1 - 118908
ER -