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MD Simulation on Collision Behavior Between Nano-Scale TiO₂ Particles During Vacuum Cold Spraying
Hai-Long Yao1, Guan-Jun Yang2, Chang-Jiu Li2
1Jiangxi Province Engineering Research Center of Materials Surface Enhancing and Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University, Jiangxi, 332005, China.
Journal of Nanoscience and Nanotechnology
|February 15, 2018
Summary
High-velocity impacts between nano-scale titanium dioxide (TiO2) particles promote adhesion for nano-ceramic coatings. Increased impact velocity intensifies particle deformation, enhancing bonding energy for effective coating formation.
Area of Science:
- Materials Science and Engineering
- Nanotechnology
- Surface Science
Background:
- Inter-nano particle bonding is crucial for nano-ceramic coating deposition via vacuum cold spraying (aerosol deposition method).
- Understanding nano-particle collision dynamics is essential for optimizing coating properties.
Purpose of the Study:
- To investigate the influence of impact velocity on the collision behavior of nano-scale TiO2 particles.
- To elucidate the relationship between collision dynamics, particle deformation, and inter-particle bonding formation.
Main Methods:
- Molecular dynamic simulation was employed to model the impact process of nano-scale TiO2 particles.
- Collision simulations were conducted by systematically varying impact velocities.
Main Results:
- Recoil efficiency of nano-TiO2 particles decreases as impact velocity increases.
- At low velocities, nano-TiO2 particles undergo localized plastic deformation; at high velocities, intensive deformation occurs.
- Intensive deformation at high velocities promotes nano-particle adhesion over rebounding.
Conclusions:
- A direct relationship between adhesion energy and rebound energy was established for nano-scale TiO2 particle bonding.
- High-velocity collisions are effective in generating the necessary adhesion energy for bonding between nano-ceramic particles.
- Simulation results provide insights into optimizing vacuum cold spraying parameters for enhanced nano-ceramic coatings.
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