This work tests the effect on microstructure, flexural strength, flexural moduli, plus the electrical and thermal conductivity of carbon/carbon composites with Mesocarbon Microbeads (MCMBs) content ranging 0 -30% by weight during carbonization. These composites were reinforced by oxidative PAN Base fiber felts, and matrix precursor was resol-type-phenolic resin. MCMBs with a weight fraction of 0 -30% were added to the matrix to elucidate the effect. Liquid-phase impregnation was applied to reinforce matrix carbon. Cured composites were stabilized at 230°C, then heat-treated at 400, 600, 800, 900 and 1000°C for carbonization. The measured flexural strength after heattreated at 1000°C was 51.20, 49.59, 43.55, and 38.76 MPa for MCMBs with 0, 10, 20, and 30% added to composites; mean flexural moduli were l.73, 1.24, 0.73, and 0.57 MPa, respectively. Adding MCMBs reduced both strength and modulus because of cracks and avoids caused by different shrinkage between resin and MCMBs; adding 30 wt % MCMBs raised thermal conductivity of C/C composites from 1.55 to 1.78 W/mK and reduced electric resistivity from 1.8 ϫ 10 Ϫ2 to 5.97 ϫ 10 Ϫ3 ⍀ cm.
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