Method of DLC Deposition on Alumina Powders: Cantilever Beam-type Vibrating Dual-frequency Plasma Fluidized Bed

Due to the constraints of deposition rate requirements, ion kinetic energy conditions, and treatment uniformity, diamond-like carbon (DLC) surface modification technology for alumina powders has not been mastered. This paper reported a cantilever beam-type vibrating dual-frequency plasma fluidized method for DLC deposition on alumina, and the high-density plasma source and high-energy ion region favoring DLC deposition were obtained by examining the discharge morphology. The surface features of modified alumina powders were analyzed by surface morphology, elemental distribution and Raman spectroscopy. The results show that DLC films were uniformly deposited on the powder surface, and the I(D)/J(G) in Raman spectra reached 0.8, corresponding to a sp3 fraction of 35%. This study provided a novel strategy for surface modification to optimize the interface of alumina-filled polymer composites.