Chemical Vapor Infiltration of Carbon Fiber Felts from Methane: Influence of Surface Area / Volume Ratios

Abstract:

Article Preview

Isothermal, isobaric chemical vapor infiltration of carbon fiber felts with fiber volume fractions of 7.1% and 14.2% were investigated at infiltration times from 20 to 120 hours, using a constant temperature of 1095 oC and a methane pressure of 22.5 kPa. Bulk densities and the density profiles as well as porosity at various densification stages were determined. Inside–outside densification was obtained in the most infiltrations, the gradients of densification along the infiltration depth decrease with increasing of residence time and infiltration times. Outside–inside densification occurs only in the felt with the lower fiber volume fraction at final infiltration stage and at longer residence times. Microstructure of the obtained matrix carbon was analyzed with a polarized light microscopy. Abruptly change from low/medium textured carbon to medium/high textured carbon are observed in both of the carbon fiber felts, whereas the thickness of the first lower textured layer is about 14 micros in the felt with a fiber volume fraction of 7.1%, whereas it is only 2 micros in the felt with a fiber volume fraction of 14.2%, which is caused by an increasing of initial surface area / volume ratio, [A/V], from 33 to 71 mm-1. Results are completely in agreement with the previous simulations studies on the influence of [A/V] ratios.

Info:

Periodical:

Edited by:

P. VINCENZINI and M. SINGH

Pages:

107-114

DOI:

10.4028/www.scientific.net/AST.50.107

Citation:

W.G. Zhang et al., "Chemical Vapor Infiltration of Carbon Fiber Felts from Methane: Influence of Surface Area / Volume Ratios", Advances in Science and Technology, Vol. 50, pp. 107-114, 2006

Online since:

October 2006

Export:

Price:

$35.00

[1] G. Savage: Carbon-carbon composites (Chapman & Hall, London 1992).

[2] E. Fitzer, L.M. Manocha: Carbon reinforcements and carbon/carbon composites (Springer, Berlin, Heidelberg 1998, pp.190-236).

DOI: 10.1007/978-3-642-58745-0_6

[3] W.V. Kotlenski: In Walker Jr. PL and Thrower PA, editors. Chemistry and Physics of Carbon Vol. 9 (Marcel Dekker, New York 1973: 173-262).

[4] I. Golecki: Mater. Sci. Eng. R20(1997), p.37.

[5] Z. Hu, G. Schoch, K.J. Hüttinger: Carbon 38(2000), pp.1059-65.

[6] W.G. Zhang, K.J. Hüttinger: Carbon 39(2001), pp.1013-22.

[7] Z. Hu, K.J. Hüttinger: Carbon 2001; 39(7), pp.1023-32.

[8] W.G. Zhang, K.J. Hüttinger: Composites Science and Technology 62(2002), pp.1947-55.

[9] M. Guellali, R. Oberacker, M.J. Hoffmann, W.G. Zhang and K.J. Hüttinger: Carbon 41(2003), pp.97-104.

[10] W.G. Zhang, K.J. Hüttinger: Carbon 40(2002), pp.2529-45.

[11] W.G. Zhang, K.J. Hüttinger: Carbon 41(2003), pp.2325-37.

[12] G.L. Dong, K.J. Hüttinger: Carbon 40( 2002), pp.2515-28.

[13] K.J. Hüttinger: Adv. Mater. -CVD 4(1998 ), pp.151-58.

[14] G. Vignoles, F. Langlais, C. Descamps, A. Mouchon, HL. Poche, N. Reuge, N. Bertrand: Surface & Coatings Technology 188-189(2004), pp.241-249.

DOI: 10.1016/j.surfcoat.2004.08.036

[15] A. Becker and K.J. Hüttinger: Carbon 36 (1998), pp.213-224.

[16] M. Teubner, J. Antes, Z. Hu, W.G. Zhang, K.J. Hüttinger: J. de Physique IV 9(1999), pp.79-84.

[17] W.G. Zhang, K.J. Hüttinger: J. Mater. Sci. 36 (2001), pp.3503-10.

[18] Z. Hu, K.J. Hüttinger: Carbon 39(2001), pp.433-41.

[19] W. Benzinger, K.J. Hüttinger: Carbon 34 (1996), pp.1465-1471.

[20] W. Benzinger, K.J. Hüttinger: Carbon 36(1998), pp.1033-42.

[21] W. Benzinger, K.J. Hüttinger: Carbon 37(1998), pp.181-93.

[22] W. Benzinger, K.J. Hüttinger: Carbon 37(1999), pp.931-40.

[23] W. Benzinger, K.J. Hüttinger: Carbon 37(1999), pp.941-46.

[24] W. Benzinger, K.J. Hüttinger: Carbon 37(1999), pp.1311-22.

[25] B. Reznik, G. Gerthson, K.J. Hüttinger: Carbon 39(2001), pp.215-29.

[26] B. Reznik, K.J. Hüttinger: Carbon 40(2002), pp.621-24.

[27] X. Bourrat, B. Trouvat, G. Limousin, G. Vignoles, F. Doux: J. Mater. Res. 15(2000), pp.92-101.

DOI: 10.1557/jmr.2000.0017

[28] A. Oberlin: Carbon 40(2002), pp.7-24.

In order to see related information, you need to Login.