Fabrication of LIG Coating on SiC/SiC Composites with Femtosecond Laser

The preparation of laser-induced graphene (LIG) coating on the surface of silicon carbide fiber reinforced silicon carbide (SiC/SiC) composites is conducted using the photothermal effect of high-repetition frequency femtosecond laser pulses by taking phenolic resin (PR) as a carbon precursor. The results reveal that the morphology, structure and properties of LIG coating can be tuned by altering the laser scanning speed. At the laser scanning speed of 200 mm/s, the LIG rendered the highest quality with a gauze-like fold of planar structure and good light transmittance, indicating the presence of multi-layered graphene flakes with ordered lattice fringes. Furthermore, the mass retention rate of LIG-200 coating was > 85% at 800 degrees C, exhibiting excellent thermal stability.