Influence of binding energies on bonding in aerosol deposition

With the growing interest in aerosol deposition for creating high-quality ceramic coatings, there is a need to establish general guidelines for estimating the required particle impact velocities and corresponding process parameters for successful material deposition. Modeling approaches allow ceramic properties to be expressed in terms of binding energies. In this contribution, a molecular dynamics study is conducted to investigate the influence of binding energy on the high-speed impact behavior of ceramic particles. The required impact velocities for their bonding are subsequently identified via impact simulations and compared with experimental data from the literature. Single-particle impacts are simulated across a range of binding energies, particle sizes, and impact velocities. The findings indicate that increasing the binding energy from 0.22 eV to 0.96 eV, roughly corresponding to Young’s moduli within a range from 150GPa to 560 GPa, can lead to up to threefold higher threshold velocities for bonding. However, despite the variations in binding energy, surpassing the threshold velocities results in a similar deformation and fragmentation pattern. This enables a general description of the impact behavior as function of impact velocity across different ceramic materials and could enhance further developments in aerosol deposition.

Keywords: aerosol deposition, nanoparticle, binding energy, molecular dynamics, ceramics