Abstract
The thermal diffusivity tensor of a polymer–carbon fiber composite with unidirectionally distributed fibers has been measured using a modulated photothermal mirage device. The thermal diffusivity along the fibers is k ∥=6.0±0.5 mm2·s−1, that perpendicular to the fibers is k ⊥=0.35±0.05 mm2·s−1, and that perpendicular to the sample surface is k z=0.40±0.15 mm2·s−1. These results have been confirmed by independent measurements on the sample by other laboratories using three other different photothermal techniques. A previous claim on anomalous results found on this sample (k ∥<k ⊥ and high thermal diffusivities) can be explained by the inappropriate use of the frequency range. We have also found that there is not perfect thermal contact between the fibers and the matrix, which can be characterized by the thermal contact resistance of R th=(9±2)×10−6m2·K·W−1.
Similar content being viewed by others
REFERENCES
H. Vargas and L. C. M. Miranda, Phys. Rep. 161:45 (1988).
H. K. Park, C. P. Grigoropoulos, and A. C. Tam, Int. J. Thermophys. 16:973 (1995).
A. Salazar and A. Sánchez-Lavega, Rev. Sci. Instrum. 65:2896 (1994).
A. Salazar, A. Sánchez-Lavega, A. Ocáriz, J. Guitonny, G. C. Pandey, D. Fournier, and A. C. Boccara, Appl. Phys. Lett. 67:626 (1995).
A. Salazar, A. Sánchez-Lavega, A. Ocáriz, J. Guitonny, G. C. Pandey, D. Fournier, and A. C. Boccara, J. Appl. Phys. 79:3984 (1996).
A. Salazar, A. Sánchez-Lavega, and A. Ocáriz, Opt. Eng. 36:391 (1997).
Proceedings of the 9th international conference on photoacoustic and photothermal phenomena, in Progress in Natural Science, Vol. 6Suppl., S. Y. Zhang, ed. (Science in China Press, Beijing, 1996).
Proceedings of the 8th international conference on photoacoustic and photothermal phenomena, in Journal de Physique IV, Colloque C7, D. Fournier and J.P. Roger, eds. (1994).
M. Bertolotti, A. Ferrari, G. L. Liakhou, R. Li Voti, A. Marras, T. A. Ezquerra, and F. J. Balta-Calleja, J. Appl. Phys. 78:5706 (1995).
L. D. Favro, P. K. Kuo, and R. L. Thomas, in Photoacoustic and Photothermal Wave Phenomena in Semiconductors, A. Mandelis, ed. (Elsevier, New York, 1987), p. 69.
A. Ocáriz, A. Sánchez-Lavega, and A. Salazar, J. Appl. Phys. 81:7552 (1997).
A. Ocáriz, A. Sánchez-Lavega, and A. Salazar, J. Appl. Phys. 81:7561 (1997).
M. Bertolotti, R. Li Voti, G. Liakhou, and C. Sibilia, Rev. Sci. Instrum. 64:1576 (1993).
A. Salazar and A. Sánchez-Lavega, Rev. Sci. Instrum. 66:275 (1995).
A. Skumanich, H. Dersch, M. Fathallah, and N. M. Amer, Appl. Phys. A 43:297 (1987).
Goodfellow Cambridge Limited catalog (1995–1996), p. 478.
T. Yamane, S. Katayama, M. Todoki, and I. Hatta, J. Appl. Phys. 80:4358 (1996).
J. E. Parrott and A. D. Stukes, Thermal Conductivity in Solids (Pion Limited, London, 1975), p. 129.
D. P. H. Hasselman and L. F. Johnson, J. Comp. Mat. 21:508 (1987).
Rights and permissions
About this article
Cite this article
Salazar, A., Sánchez-Lavega, A. Measurements of the Thermal Diffusivity Tensor of Polymer–Carbon Fiber Composites by Photothermal Methods. International Journal of Thermophysics 19, 625–636 (1998). https://doi.org/10.1023/A:1022598302382
Issue Date:
DOI: https://doi.org/10.1023/A:1022598302382