Dynamic mechanical properties of carbon-carbon composites
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The dynamic mechanical analysis (DMA) method was utilized to investigate the dynamic mechanical properties of the carbon-phenolic composite, and of carbon-carbon (C/C) composites carbonized at 1000°C, and graphitized at 2200°C. The measurements were performed in the temperature range 50–450°C. Results show that the carbon-phenolic composite has the highest storage modulus, while the carbonized C/C composites possess higher storage modulus than the graphitized C/C composite. The storage moduli of carbonized and graphitized C/C composite do not change significantly in the test temperature range. The tan δ, loss factor, of carbonized C/C composites increases 59.5% during the tests from 50 to 450°C, and that of the graphitized C/C decreases 9.74% in the same temperature range; graphitized C/C shows the highest tan δ at 50 °C. The carbon-phenolic composite shows a damping peak at 250 °C, which is probably due to the transition from glassy state to rubbery state of the phenolic matrix. The higher tan δ of the graphitized C/C composite may be due to matrix graphitization, fibre-matrix debonding and crack formation, which were observed on the micrographs.
KeywordsPolymer Material Processing Test Temperature Storage Modulus Mechanical Analysis
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- 4.J. D. Buckley, Ceram. Bull. 67 (1988) 364.Google Scholar
- 8.S. W. Tsai, “Introduction to Composite Materials” (Technomic Publishing, Wesetport, CT, 1980) pp. 1–24.Google Scholar
- 9.T. Murayama, “Dynamic Mechanical Analysis of Polymeric Material” (Elsevier Scientific, New York, 1978) pp. 10–35.Google Scholar
- 10.L. E. Nielsen, “Mechanical Properties of Polymers and Composites” (Marcel Dekker, New York, 1974) pp. 139–235.Google Scholar
- 11.M. P. Blake and W. S. Mitchell, “Vibration and Acoustic Measuring Handbook” (Spartan, New York, 1972) pp. 1–15.Google Scholar
- 12.R. N. Hamme, “Harris Handbook of Noise Control: Vibration Damping” (McGraw-Hill, New York, 1957) pp. 1–10.Google Scholar
- 14.B. D. Cullity, “Elements of X-Ray Diffraction”, 2nd Edn (Addison-Wesley MA, 1978) p. 102.Google Scholar