Effect Of Nano SiC And CaCO₃ On Tribology Properties Of GF/EP Composites

The preparation and tribological properties of epoxy resin composites which filled with two kinds of particles nano SiC and CaCO3, reinforced with nonalkali glass fibre cloth was studied.The curing reaction of methyltetrahydrophthalic-anhydride/epoxy was studied by differential scanning calorimetry (DSC) to determine the curing condition; The nanoparticles coated with titanate coupling agent were tested by fourier transform infrared spectroscopy (FT-IR); Flexural strength and flexural modulus of glass fibre cloth reinforced epoxy resin (GF/EP) composites were tested by universal testing machine; The friction and wear properties of GF/EP composites and G-10 were tested by friction and wear testing machine; The worn surfaces were observed by scanning electronic microscope and three-dimensional surface profile meter.The nanoparticles coated with titanate coupling agent NDZ-102 modified the dispersion of nanoparticles in epoxy matrix and interfacial compatibility between nanoparticles and matrix, the chemical bond between the coupling agent and the nanoparticles was proved by FT-IR; Orthogonal analysis of flexural strength and flexural modulus indicated that, when the addition contents of nano-SiC and nano-CaCO3 were 2%-4%, respectively, the GF/EP composites showed better mechanical property.The nanoparticles reinforced GF/EP composites under dry sliding friction and low speed indicated that, the nano-SiC had a great effect on friction coefficient and weight loss. When the contents of nano-SiC and nano-CaCO3 were 2%, respectively, the GF/EP composites showed best tribological behaviour.During high speed wear tests, the GF/EP composites and G-10 showed the same properties. Under a constant load, with the increase of sliding speed, the friction coefficients increased firstly then decreased, and appeard the highest point at the speed of 30 m/s, the wear rates were always increased. Under a constant sliding speed, with the increase of load, the friction coefficients were always decreased, while the wear rates were always increased.During low speed wear tests, the wear mechanism of GF/EP composites were surface fatigue and abrasive. During high speed wear test, the wear mechanism of non-nanoparticles GF/EP composites were adhesive, surface fatigue and abrasive;the wear mechanism of nanoparticles GF/EP composites were surface fatigue, abrasive and melt; the wear mechanism of G-10 were adhesive and surface fatigue.