▎ 摘　　要

NOVELTY - A composite material comprises a natural fiber-reinforced thermoset polymer. USE - Composite material is used for manufacturing ceramic material, multilayer armor, personal vest, military vehicle, or layer of multilayer ballistic system e.g. ballistic armor for protection against firing of rifle with caliber ammunition 7.62 mm or 5.56 mm (all claimed). ADVANTAGE - The composite material is lightweight, and can be manufactured by economical method, and has excellent ballistic performance, strength, toughness and durability. The composite material in the multilayer ballistic system has desired function of capturing the ceramic and projectile fragments resulting from the frontal impact. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: manufacture (P1) of the composite material, which involves accommodating 30 vol.% piassava fibers functionalized with graphene oxide inside a suitable metallic mold, adding an epoxy resin in the form of fluid, and sealing the mold; a ceramic material, which comprises the composite material and 4 %mass alumina doped with niobium pentoxide with hexagonal geometry, and has a thickness of 7 mm, 8 mm, 9 mm or 10 mm. The ceramic material is prepared by weighing alumina powder, niobium pentoxide and polyethylene glycol in liquid phase, passing to an alumina ball mill, ball-milling for 12 hours and drying in an oven at 80° C for 48 hours; manufacture (P2) of the ceramic material, which involves sieving raw material of ceramic material, pressing under a pressure of 30 MPa and sintering; and a multilayer armor, which comprises the composite material bonded to a ceramic front layer responsible for eroding the projectile and attenuating its impact, with a polyurethane adhesive.