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    Atmospheric pressure plasma surface modification of titanium for high temperature adhesive bonding

    Year: 2011

    Journal: International journal of adhesion ans adhesives 2011, 31 (7) pp 598-604, 20121211

    Authors: M. Akrama, K.M.B. Jansena, L.J. Ernsta, S. Bhowmik

    Organizations: PME Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands, Faculty of Aerospace Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands

    In this investigation surface treatment of titanium is carried out by plasma ion implantation under atmosphericpressureplasma in order to increase the adhesive bond strength. Prior to the plasma treatment, titaniumsurfaces were mechanically treated by sand blasting. It is observed that the contact angle of de-ionized water decreases with the grit blast treatment time. Optical microscopy and scanning electron microscopic (SEM) analysis of untreated and atmosphericplasma treated titanium are carried out to examine the surface characteristics. A substantial improvement in the surface energy of titanium is observed after the atmosphericpressureplasma treatment. The surface energy increases with increasing exposure time of atmosphericpressureplasma. The optimized time of plasma treatment suggested in this investigation results in maximum adhesive bond strength of the titanium. Unmodified and surface modified titanium sheets by atmosphericpressureplasma were adhesively bonded by hightemperature resistant polyimide adhesive. The glass transition temperature of this adhesive is 310 °C and these adhesively bonded joints were cured at hightemperature. A substantial improvement in adhesive bond strength was observed after atmosphericpressureplasma treatment.