30 / 2025-04-25 14:43:04

Non-electrode plasma electrolysis for fibers and powders for aero-industrial applications

Carbon fiber; Non-electrode modification; Cathodic polarization; Liquid phase plasma; Dynamic sealing material

In response to the urgent need for domestic substitution and performance improvement of carbon fiber composites, focusing on the key technical bottlenecks such as fiber damage, agglomeration and coating uniformity during the surface modification process of carbon fibers, a new non-electrode surface modification method was proposed, aiming to break through the limitations of traditional electrode processes and achieve the independent and controllable preparation of high-performance carbon fiber composites. A new cathodic polarization process based on the synergy of plasma field, temperature field, electric field, and fluid field was proposed innovatively. A low-temperature liquid environment effectively modified the carbon fiber surface to avoid the damage to the fiber structure caused by high-temperature treatment. Meanwhile, the Coulombic agglomeration of ultrafine short fibers in the electrolyte was inhibited by multi-physics field coupling, and the dispersion of fibers was improved by more than 30%. A non-electrode grate-tooth double-motion continuous deposition device was designed to achieve highly uniform nickel plating on the surface of ultrafine short fibers (carbon-nickel mass ratio 0.1-0.15), and deformable dynamic sealing materials with a density of 0.5-1g/cm³ were successfully prepared. A jet-type liquid-phase plasma device was developed, which broke through the limitation of uniform deposition of ceramic coatings on the complex structures of wide two-dimensional fabrics and three-dimensional preforms. When applied to carbon phenolic heat-resistant sleeve components, the temperature resistance performance was greatly improved. This study provides a brand-new solution for preparing high-performance chopped carbon fiber composites, significantly enhancing the independent support capacity for aero materials.