Nanocrystalline Amorphous Coating for Nuclear Cladding

The patent changes the deposition parameters by using pulsed laser deposition instead of conventional GESA treatment, controlling pulse duration, frequency, and energy to prevent electronic pulse overlap and achieve proper Al content distribution in the coating

The patent creates a composite coating structure with alumina matrix reinforced with crystalline nanodomains, combining the corrosion resistance of alumina with the mechanical strength of crystalline phases to prevent both corrosion and fretting corrosion

The patent develops a composite coating system where alumina is combined with crystalline nanodomains (such as alpha-alumina or other refractory metal oxides) to create a coating that maintains both corrosion resistance and mechanical integrity under fretting conditions

The patent creates local crystalline phases within the amorphous alumina matrix at critical contact zones, providing enhanced mechanical properties where fretting corrosion occurs while maintaining the protective corrosion barrier throughout the coating

The patent uses pulsed laser deposition parameters (pulse width, frequency, energy density, substrate temperature) to control the formation of nanocrystalline phases within the coating, achieving a microstructure that simultaneously provides chemical stability, compactness, stiffness, and mechanical property correspondence with the substrate at high temperatures

The patent creates a nanocomposite coating with amorphous alumina matrix and crystalline nanodomains, where the crystalline phases provide high-temperature stability and the amorphous matrix provides compactness and adhesion, achieving all required properties simultaneously