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.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2011: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 13, 2011
Pages: 215 - 218
Industry sector: Advanced Materials & Manufacturing
Topics: Carbon Nano Structures & Devices