▎ 摘　　要

NOVELTY - A composite material comprises a natural fiber reinforced thermoset polymer. USE - Composite material e.g. composite plate used as layer in ballistic armor in personal vest or military vehicle to protect against rifle fire with 7.62 mm or 5.56 mm calibers for function of capturing ceramic and projectile fragments resulting from frontal impact (all claimed). ADVANTAGE - The composite material avoids fragmentation of the fragile polyester polymer matrix, thereby allowing the composite plate to maintain its integrity for protection against subsequent firing of rifle and has high impact power. The thickness of the ceramic material is reduced, so that cost and weight of the system can be decreased. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: manufacture of the composite material, which involves accommodating piassava fiber functionalized with graphene oxide, corresponding to the desired proportion of 30 vol.% within the mold suitable metal and adding graphene oxide functionalized polyester resin and covering the mold; ceramic material, which has thicknesses of 7, 8, 9 and 10 mm and is prepared by weighing and packing alumina doped with niobia in the amount of 4 %mass with hexagonal geometry and polyethylene glycol powders, in liquid phase, in an alumina ball mill for 12 hours, and leaving still for 48 hours in an oven at 80° C for drying; manufacture of the ceramic material, which involves performing maceration and sieving to obtain the powder, pressing under a pressure of 30 MPa and taking the obtained green component to the oven to be sintered; and multilayer armor, which comprises the composite plate glued with a polyurethane adhesive to a ceramic front layer, responsible for eroding the projectile and attenuating its impact.