Luminous discharge analysis on ceramic coating process by “Aerosol Deposition Method”: influence of particle rate and size

One of the most promising methods for ceramic coatings with low energy consumption is the Aerosol Deposition Method (ADM). ADM allows highly dense, micrometer-thick coatings with nanometric structures at room temperature, without a sintering process. These coatings are formed through the impact of fine particles with high kinetic energy, resulting in mechanical adhesion and solid film formation. A key phenomenon observed during this process is luminous discharges or optical emissions, which occur when aerosol particles collide with the substrate or each other, generating light.

These light emissions, known as luminescence, can result from mechanisms like fracto-emission (particle rupture light), tribo-emission, or electrical charges generated by friction during impact. Despite being commonly observed, many questions remain about these light discharges: Are they beneficial to the coating process? Do they improve coating quality? Does their effect depend on particle size?

This research aims to analyze this optical emissions and establish their relationship with particle size and rate. By using optical characterization techniques and high-speed imaging, the study seeks to measure these light emissions and correlate them with processing conditions. The goal is to understand how particle velocity and size influence light emissions, thereby optimizing ADM process parameters to achieve superior ceramic coatings.