Low-Cost Nanocrystalline Nickel Reinforcement of Additively Manufactured Polymers for Extreme Industrial Environments

Overview

Despite its accessibility and geometric versatility, polymer additive manufacturing remains limited in industrial use due to the inherent structural and chemical vulnerabilities of polymers. While nanocrystalline nickel reinforcement offers a path forward — achieving superalloy-class performance on metals — its application to polymers has been prevented by high interfacial stresses and proprietary manufacturing barriers. This research addresses these challenges by developing a low-cost, dual-layer methodology for nanocrystalline nickel reinforcement of 3D-printed polymers. An autocatalytic electroless nickel-phosphorus (ENiP) mid-layer is deposited onto sensitized and palladium-activated polycarbonate, establishing a molecularly anchored, conductive foundation. This foundation enables nanocrystalline nickel synthesis via pulsed-current electrodeposition in a nickel sulfamate bath with saccharin and L-cysteine as grain refiners. Nanoscale grain refinement was achieved through an optimized 1:10 duty cycle (3 ms ON / 30 ms OFF). The resulting composite shell measures ~100 µm. Coated polycarbonate achieved a surface hardness of 800 HV (a 40-fold increase over the base substrate), with the coating exhibiting an intrinsic strength of 1,580MPa while occupying only 2% of the cross-sectional area. Environmental testing confirmed the shell effectively resists 1300°C thermal loads and aggressive chemical solvents. Applicability to complex industrial geometries was demonstrated through the design and fabrication of a centrifugal turbopump. This approach provides a pathway to superalloy-class surface properties on polymer substrates using commercially available reagents and benchtop equipment, reducing production costs by over 99% compared to metal additive manufacturing.

Competition history

• ISEF 2026 Materials Science · Entry MATS015

Resources

• ISEF abstract page ↗

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