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Micro-crack Pinning and Interfacial Fracture in Mixed Metal Oxide Reinforced Epoxy Nanocomposite

  • Ramakrishna Vasireddi
  • D. Roy Mahapatra
Article

Abstract

The effects of mixed metal oxides (CexZr1−xO2) nanoparticle dispersion on the mechanical properties and fracture mechanisms of epoxy polymer matrix and its composite with glass fiber system are reported in this paper. CexZr1−xO2 nanoparticles are synthesized using sol–gel method, and its crystallinity is optimized. Epoxy nanocomposites are synthesized by a dispersion technique, and the compressive properties are optimized. The glass transition temperature has been improved. Epoxy with 5 wt.% of Ce0.75Zr0.25O2 shows optimal results with an increase of 17.4% in compressive modulus, and an increase of 23.4% in compressive strength with respect to those of neat epoxy. This improvement attributes to higher strength of shearing of polymer during the fracture of the nanoparticle interface. Micro-crack kinks at the interfaces can further delay fracture under compression. E-glass fabric-reinforced 5 wt.% Ce0.75Zr0.25O2–epoxy nanocomposite also shows improvement in the mechanical properties via nanoscale interface with fibers. This type of ceramic nanocomposites has useful applications in thermal/electrical insulations besides improving the compressive/buckling properties.

Keywords

ceramic glass fabric interface fracture micro-crack nanoparticles nanocomposite oxide zirconia 

Notes

Acknowledgments

Authors acknowledge the financial support under the ACECOST phase-III program of the Aeronautics Research and Development Board to carry out this research.

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Department of Aerospace EngineeringIndian Institute of ScienceBangaloreIndia

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