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A systematic study on evaluating the effect of micro- and nano-sized magnesium oxide (MgO) particles on the mechanical properties of carbon fiber/epoxy composites was conducted by adding various contents of MgO particles into an epoxy resin matrix. The impact and flexural strengths were determined by the Charpy impact tests and three-point bending experiments, respectively. We found that the carbon fiber/epoxy composites filled with nano-MgO particles had higher mechanical strength than that of the carbon fiber/epoxy composites filled with micro-MgO particles. Both impact and flexural strength were enhanced by adding the proper content of nano-MgO particles. Although the impact strength was increased by adding micro-MgO particles, the flexural strength was decreased by adding micro-MgO particles. In addition, the influence of the nano- and micro-particles on the failure modes of the fiber/epoxy composites was also studied and is described.

Mechanical Properties of Carbon Fiber/Epoxy Composites Modified with Micro- and Nano-Sized Magnesium Oxide Particles