Molecular dynamics study on friction property between fused silica and SiC mold in high temperature molding

Y Wu and B Zou and L Li, MATERIALS TODAY COMMUNICATIONS, 26, 101878 (2021).

DOI: 10.1016/j.mtcomm.2020.101878

The friction property between glass and mold have an important impact on the forming quality of optical components and working lifetime of the mold in the precision glass molding process. The effects of driving force, pressing force and temperature on the friction property between fused silica and SiC mold during high temperature molding were studied by molecular dynamics simulation. Two different surface nanostructures, semi cylindrical and square column groove, were also considered. The velocity and density distributions as well as the structure information of fused silica were calculated in the process of flowing along SiC mold surface. The results indicate that flow rate, density and interatomic force are the three dominant factors which control the friction force by affecting amplitude change and transfer of momentum. Among them, the effect of interatomic force on friction is the most obvious. The study can help to provide the optimized parameters of precision molding of fused silica and improve the production quality of optical components.

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