HiPIMS Nanolayer Coatings for Accident-Tolerant Fuel Cladding

The patent applies composite materials by creating nanolayered coatings that combine multiple materials (e.g., metallic layers like Nb, Mo, W with ceramic layers like SiC, SiO2, Al2O3) to achieve superior performance under extreme conditions. The nanolayered structure integrates the oxidation resistance of ceramics with the ductility and toughness of metals, providing both protective functionality and mechanical integrity that single-material coatings cannot achieve.

The patent applies segmentation by dividing the coating into multiple thin nanolayers (each layer typically 1-100 nm thick) rather than using a single thick coating. This segmentation creates numerous interfaces that act as barriers to crack propagation and delamination, while maintaining thin overall thickness to preserve neutron economy and thermal conductivity. The segmented structure allows each layer to be optimized for specific functions.

The patent applies parameter changes by utilizing high-power impulse magnetron sputtering (HiPIMS) with peak powers reaching several kilowatts, representing a significant change from conventional low-power sputtering. This parameter change enables rapid deposition rates while maintaining the quality of nanolayered structures. The pulsed nature of HiPIMS allows for precise control of deposition parameters, achieving both high speed and high quality coatings.

The patent applies periodic action through the use of pulsed direct current (DC) power delivery in HiPIMS, where the power is delivered in repeated pulses rather than continuously. This periodic action creates cycles of high-power deposition followed by lower-power periods, allowing for controlled nanolayer formation with precise thickness control while maintaining high overall deposition rates through the accumulation of many rapid deposition cycles.

The patent applies feedback through real-time monitoring and control of deposition parameters during the coating process. The HiPIMS process incorporates sensors and control systems that continuously monitor plasma conditions, deposition rate, and layer thickness, providing feedback to adjust process parameters to maintain uniformity and quality. This feedback mechanism ensures consistent nanolayer formation across the entire coating surface.

The patent applies mechanics substitution by replacing mechanical contact-based coating methods with physical vapor deposition (PVD) through magnetron sputtering. This substitution eliminates mechanical variations and contact inconsistencies, providing more uniform and controllable thin-film deposition. The vapor-phase deposition process inherently produces more uniform coatings compared to mechanical application methods.