Functionally graded materials (FGMs) have an incessant change in the
composition over the thickness, which brings about a continuous difference in the
properties. The capacity of the FGMs to perform in excess of one is differentiating
capacities as an integral structure makes them an appealing material for aerospace
applications. In this investigation wollastonite particles filled epoxy were studied.
Particles were added with (0, 2, 4, 6 and 8 wt. %) to epoxy separately and together as
functionally graded composite and the effects of the addition of wollastonite on the
epoxy risen were investigated. Moreover, to improve surface performance,
epoxy/stearamide coating layer had been applied to the outer surface with 800 ?m
thickness. The mechanical properties such as Impact, tensile and flexural strength, as
well as, the surface properties (coefficient of friction, wear rate, and contact angle)
had been studied. Scanning electron microscopes SEM were used to characterize the
fracture surfaces. It is found that the fracture toughness of graded reinforced
composite is higher than that of the unreinforced epoxy and non-graded reinforced
composite, while the flexural modulus is found to be lower in the graded composites
as compared to the unreinforced epoxy but it has a median value compare with nongraded
composite. Tensile strength decreased in graded composite, while hardness
increased with increasing fillers contents. The coefficient of friction was decreased
with increasing the percentage of stearamide in the coating layer, the static contact
angle increased linearly with increasing weight percentage of stearamide compare
with the pure epoxy. The gradient showed clearly in scanning electron microscope.