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Nano‐ and Microcomposite Al2O3‐Y2O3 Coatings Produced by Sol‐Gel Process

Nano‐ and microcomposite Al2O3‐Y2O3 coatings have been deposited on Fe‐Cr‐Mo alloy substrates using sol‐gel composite coating technology. The processes include dipping samples in a sol‐gel solution dispersed with fine ceramic powders, which is prepared by high‐energy ball milling. High‐resolution microscopy (FE‐SEM) analyses show that the coating is composed of composite particle clusters with an average diameter of 1 µm, and the coating is relatively dense without cracking during drying and sintering stages. XRD analyses show that the oxide coating is mainly composed of α‐Al2O3 and γ‐Al2O3. The oxidation tests performed in air at 600°C show that the coatings possess much improved resistance to high temperature oxidation and scale spallation. It is believed that the nano‐structured composite particles and reactive elements are integrated into the coatings, which played an important role in improving the aggregation of nanoparticles and the production of cracks.