Authors: D. Starikov, A. Price, T. Glenn, F. Attia, M. Fischer, M. Bokadoum, A. Bensaoula
Affilation: Integrated Micro Sensors Inc, United States
Pages: 215 - 218
Keywords: nanoreinforced composites, carbon nanotubes, micro column arrays, bonding, electrical properties
Dramatic increase in the bond strength of composite/adhesive interfaces of nano reinforced composite material joints and structures has been achieved using laser-assisted fabrication of Micro Column Arrays (MCA) on the surface of the two materials prior to bonding. Several advantages of the MCA technology resulting in drastic improvement of virtually any bond include: interlocking of the adhesive material between micro columns, about 10-fold increase of the specific surface area, inherent elasticity of the micro columns, enhanced resistance to hydrothermal failures, substantially improved wettability, and control over the surface chemistry. The results of the conducted mechanical stress tests indicate, that in most cases, the bond strength is reaching the ultimate strength of the adhesive. Thus, further improvements of the joints can be achieved by employment of stronger adhesives, in particular, carbon nanotube reinforced epoxies. In addition to the improved mechanical strength and thermal resistance, these adhesives exhibit interesting electrical properties, such as measurable conductivity, capacitance, and impedance. Besides exploring the bonding improvement possibilities, current research is focused on investigation of approaches based on using the bond interface electrical properties in order to develop viable concepts of transducer devices and systems for joint health monitoring and other sensing applications.