Abstract
Carbon/carbon composites (C/Cs) with nanographite platelets (NGP) filler in a matrix derived from phenolic resin were produced. Different weight concentration (0.5, 1.5, 3, 5wt.%) NGP were introduced by spraying the NGP during the prepreg formation. The NGP-reinforced C/Cs were characterized for effect of NGP concentration on microstructure, porosity, interlaminar shear strength (ILSS), flexural, ultrasonic and vibration damping behavior. At 1.5wt.% NGP C/C, the highest values of ILSS observed was 10.5MPa (increased by 22%), flexure strength of 142.4MPa (increased by 27%), flexural modulus of 59.2GPa (increased by 68%) and porosity of 18.8% (reduced by 17.5%) in comparison to neat (without NGP) densified C/C. Ultrasonic testing revealed an average increase of 15% through the thickness Young’s modulus of NGP-C/C; (3.12GPa at 1.5wt.% NGP). A 20% average decrease in the damping ratio of the first four modes of vibration was observed in 1.5wt.% NGP densified C/C. At low concentration (⩽1.5wt.%) the NGP filled in the pores, cracks and debonded interface but at concentration higher than 1.5wt.% NGP lost their effectiveness due to agglomeration. The required cycles for desired density/properties are projected to be less compared to neat C/C due to less porosity observed in ⩽1.5wt.% NGP concentration C/C.
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