Aluminum oxide is widely used as a technical ceramic in components that require hardness, wear resistance, and chemical stability. It is commonly applied in components such as seals, substrates, and protective parts.¹ In microelectronics, Al₂O₃ is used as a dielectric and passivation material in semiconductor devices, where it provides electrical insulation and contributes to device reliability.² In optical and protective systems, aluminum oxide is applied in thin film coatings primarily as a durable protective layer for optical components.³ Al₂O₃ also plays an important role in catalysis and catalyst support applications, where thermally stable oxide surfaces are required for chemical and materials processing.⁴ Al₂O₃ is also available in α, β, and γ phases, which differ in structure and surface characteristics, allowing selection of the appropriate forms for structural or catalytic applications.^1,4