Abrasive wear of epoxy composites filled by metallic particles and reinforced by metallic wires

摘要

Abrasive wear caused by sandy soil of steel specimens coated by epoxy resin was investigated. Experiments were carried out using an abrasive wear tester developed to simulate the wear of the tillage tools under controlled testing conditions. Epoxy coatings were filled by metallic particles such as aluminium, copper, iron and tin of 30 - 50 urn particle size. Also, epoxy coatings were reinforced by copper, steel and tinned steel wires of different wire diameters. Based on the experimental results, it was found that addition of metallic particles into epoxy coatings showed relatively higher wear than that displayed by unfilled epoxy coatings. Among metallic particles, iron and aluminium filled epoxy coatings showed the lowest wear values followed by copper and tin. Wear significantly increased with increasing metallic content in the epoxy matrix. Wear of composites reinforced by copper wires slightly decreased down to minimum then significantly increased with increasing wire diameter. Perpendicular orientation represented the lowest wear followed by 45° cross plied, cross plied and parallel wire orientations. It seems that reinforcing epoxy coating by copper wires increased the tensile strength of the coating in the direction of the wires. Epoxy composites reinforced by steel wires showed relatively higher wear than that reinforced by copper wires. The minimum wear was observed for epoxy reinforced by wire diameter ranged from 0.2 to 0.4 mm for all the tested wire orientations. When the steel was coated by tin and used as reinforcement inside epoxy coatings, significant decrease in wear was observed. Tinned steel wires showedan increased elastic deformation which can absorb the impact and withstand the abrasive action of sandy particles. It was observed that coating steel surface by epoxy reinforced by tinned steel wires displayed lower wear than that observed for uncoated steel.