Surface Treatment of CFRP Composites by Ar~+ Irradiation To Improve Bonding Strength Between Aluminum and CFRP Composites

摘要

The effect of surface treatment of carbon fiber reinforced plastic (CFRP) composites on the T-peel strength and the shear strength between CFRP and aluminum panels was studied. The surface of the composite panel was treated with Ar~+ irradiation under oxygen environment. The optimal Ar~+ ion dose was determined by measuring the changes of contact angle and surface energy as a function of ion dose. T-peel tests and SLS tests performed using irradiated CFRP/aluminum specimens and unirradiated CFRP/aluminum specimens to determine the treatment effect by Ar~+ irradiation under oxygen environment on the T-peel strength and shear strength of CFRP/aluminum composites. The results showed that contact angle on the surface of the composite panel was reduced from approx 80 deg to approx 80 deg and the surface energy increased from 31 ergs/cm~2 to 72.4 ergs/cm~2 with an ion dose of 10~(17) ions/cm~2. T-peel strength and shear strength are significantly affected by the surface treatment, of composite panel. T-peel strength and shear strength improved 650% and 56%, respectively, when the treatment was made with an ion dose of 10~(16) ions/cm~2. SEM examination showed that the improvement of bonding strength was attributed to the uniform spread and fracture of epoxy adhesive.