Sage Journals: Discover world-class research

Abstract

In this article, the possibilities of impregnation of C-C composites with coal tar pitches in a microwave field are discussed. The structural changes in the pitch are investigated by means of FTIR, Raman spectroscopy, and XRD. The favorable effect of microwave heating is explained by structural changes which take place in situ during the impregnation. The spectroscopically proven splitting of large molecules improves flow properties of the pitch and facilitates the filling of the open pores. The structural changes in the pitch proceed quite rapidly so that the process is practically terminated in a relatively short time (after about 5 min) of the microwave action. Reduction of the porosity of the composites to a desired value can therefore be performed in several short steps. It seems that the method can reduce the costs of the preparation of C-C composites and render it more ecological.

Keywords

carbon-carbon composites coal tar pitch impregnation mechanical properties

Get full access to this article

View all access options for this article.

References

Krysa, J. , Balık, K. , Krena, J. and Gregor, J. (1998). Corrosion of Carbon-Epoxy Resin (C/E) and Carbon-Carbon (C/C) Composites , Materials Chemistry and Physics, 57: 156-161 .

Pesakova, V. , Klezl, Z. , Balık, K. and Adam, M. (2000). Biomechanical and Biological Properties of the Implant Material Carbon-Carbon Composite Covered with Pyrolytic Carbon , Journal of Materials Science: Materials in Medicine, 11: 793-798 .

Fitzer, E. (1987). The Future of Carbon-Carbon Composites , Carbon, 25(2): 163-190 .

Fitzer, E. and Manocha, L.M. (1998). Carbon Reinforcements and Carbon/Carbon Composites, Springer-Verlag, Heidelberg .

Chlopek, J. , Blazewicz, S. and Powroznik, A. (1993). Improvement of C-C Composites Properties by Pitch Impregnation , Ceramics International, 19: 508-509 .

Fu, Y.C. and Blaustein, B.D. (1969). Pyrolysis of Coals in a Microwave Discharge , I&EC Process Design and Development, 8(2): 257-262 .

Gasner, L.L. , Denloye, A.O. and Regan, T.M. (1986). Microwave and Convential Pyrolysis of a Bituminous Coal , Cem. Eng. Commun., 48(4-6): 1-6 .

El harfi, K. , Mokhlisse, A. , Chanaa, M.B. and Outzourhit, A. (2000). Pyrolysis of the Moroccan (Tarfaya) Oil Thales under Microwave Irradiation , Fuel, 79(7): 733-742 .

Uslu, T. and Atalay, U. (2003). Microwave Heating of Coal for Enhanced Magnetic Removal of Pyrite, Fuel Process. Technik. , 1694: 1-9.

10.

Yang, K.S. , Yoon, J.Y. , Lee, M.S. , Lee, W.J. and Kim, J.H. (2002). Further Carbonization of Anisotropic Pitch-based Carbons by Microwave Irradiation , Carbon, 40(6): 897-903 .

11.

Jullien, H. , Delmonte, M. and More, C. (1998). Recent Progress in the Microwave Processing of Polymers and Polymer Composite , In: Proc. of International Conference on Microwave Chemistry, OR 29, Prague, 6-11 September, Czech Republic.

12.

Fernandez, J.J. , Figueiras, A. , Granda, M. , Bermejo, J. and Menendez, R. (1995). Modification of Coal Tar Pitch by Air-blowing-I . Variation of Pitch Composition and Properties, Carbon, 33(3): 295-307 .

13.

Cuesta, A. , Dhamelincourt, P. , Laureyns, J. , Martynez-Alonso, A. and Tascon, J.M.D. (1998). Comparative Performance of X-ray Diffraction and Raman Microprobe Techniques for the Study of Carbon Materials , J. Mater. Chem., 8(12): 2875-2879 .

Possibility of Densification of Carbon-Carbon Composites with Coal Tar Pitch using Microwave Heating

Abstract

Keywords

Get full access to this article

References