A Novel Method for Preparing Nano‐ and Microcomposite Al2O3‐ZrO2 Ceramic Coatings

Nano‐ and microcomposite Al2O3‐ZrO2 coatings were deposited on various substrates in a sol‐gel ceramic paint by a supercentrifugal force and a gradual sintering process. Fine metal oxide powders were dispersed in a sol‐gel solution by superpower ball milling so as to form a uniform stable ceramic paint. High‐resolution microscopy (FE‐SEM) was used to characterize the coating, indicating that the coating is composed of composite particle clusters with an average diameter of ∼1 µm. The clusters consisted of larger particles with an average diameter of ∼0.5 µm in center and smaller particles of ∼100 nm surrounding the larger ones. The coating was relatively dense and increasingly dense toward the substrate surface.