Atomic simulation of textured silicon carbide surface ultra-precision polishing

Meng, Xiaosong; Wu, Weilong; Liao, Bokai; Dai, Houfu

doi:10.1016/j.ceramint.2022.02.259

Cited by 31 publications

(9 citation statements)

References 44 publications

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“…The normal force is always greater than the tangential force; these findings are consistent with previous studies. 3,34 However, regardless of whether the coating thickness is 1.5 nm or 1 nm, the cutting force of Cu coating is always lower than that of other metal coatings when the coating thickness is the same. The tangential force of the uncoated model is about 800 nN greater than that of the 1.5 nm Cu coating and 450 nN greater than that of the 1 nm Cu coating.…”

Section: Resultsmentioning

confidence: 99%

“…32 Therefore, the y direction of the model is set as a periodic boundary to reduce the size effect. As it is previously reported, 33,34 the outermost layer of the workpiece is set as a fixed layer to prevent the workpiece from moving. The thermostatic layer is used to dissipate excess heat, while the atoms in Newton's layer and coating follow Newton's second law.…”

Section: Model Establishmentmentioning

confidence: 99%

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Influence of the metal coating on nano-cutting process of cubic silicon carbide

Hu,

Dai

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The effect of the metal coating on the machinability of cubic silicon carbide was investigated by molecular dynamics simulation. The effect of the metal coating on the surface of the workpiece was explained using cutting force, friction coefficient, surface morphology, stress, temperature, and tool wear. The results show that the influence of metal type on cutting force, surface morphology, and stress is insignificant for coating thickness. However, the model with Cu coating has a tool suspension key number of 400 at the maximum cutting distance. The number of tool suspension keys for the Ni-Ti coating model is around 1700, indicating that the type of coating has a significant impact on tool wear. Furthermore, the results also show that in the three metals of Cu, Ni and Ni -Ti, Cu coating has the greatest impact on improving cutting performance. Among them, the average cutting force of 1.5 nm Cu coating is about 33.3% lower than that of without coating, and the tool wear is about 26.7% lower. These results demonstrate the effects of the metal coating on the workpiece surface from a theoretical point of view.

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Section: Resultsmentioning

confidence: 99%

Section: Model Establishmentmentioning

confidence: 99%

Influence of the metal coating on nano-cutting process of cubic silicon carbide

Hu,

Dai

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…To simulate the roughness of materials surface, we set texture with different directions on the copper film to investigate the effect of texture direction on the scraping process of nickelcopper bilayer film [17,19,[33][34][35]. Due to the crystal anisotropy, the performance of nickel atoms that arrange along different crystallographic orientation vary at nano scale.…”

Section: Effects Of Texture Direction and Crystallographic Orientationmentioning

confidence: 99%

Molecular dynamics simulations into rolling scraping of nickel-copper bilayer film

Dai,

Gao,

Yao

2024

Modelling Simul. Mater. Sci. Eng.

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In order to investigate the nanoscale friction mechanism and deformation behavior of nickel-copper bilayer film under rolling scraping, the effects of different factors during friction process such as the translation velocity, rotation velocity, radius of abrasive grain, contact depth, texture direction and crystallographic orientation are analyzed through molecular dynamics methods in terms of contact force, atomic lattice structure, internal substrate dislocation, kinetic energy and temperature. Results show that the contact force increases with the increase of the translation velocity or the decrease of the rotation velocity. Abrasive grains in a purely rolling state cause the most serious damage to the substrate. The contact force increases with the increase of contact depth or the decrease of abrasive grain radius, the amount of change in temperature and kinetic energy both increase with contact depth and abrasive radius. The crystallographic orientation has a significant effect on rolling scraping process and there is a crystallographic orientation with the minimum contact force. The degrees of substrate dislocation and the numbers of lattice reconstruction atoms under different factors and levels vary widely.

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“…Consequently, the processing quality and precision of copper cannot be guaranteed, and this can adversely affect the dimensional accuracy and mechanical properties of copper devices, especially impacting their service life. 12–14 Therefore, to minimize the impact of processing damage on material properties and service life, it is essential to study the formation and evolution of damage during high-precision processing.…”

Section: Introductionmentioning

confidence: 99%