Tribological behaviour of textile reinforced ceramic matrix composites
Werner Hufenbach, Albert Langkamp, Klaus Kunze Technische Universität Dresden, Institut für Leichtbau und Kunststofftechnik (ILK), 01062 Dresden, Germany
Quarterly No. 2, 2005 pages 17-22
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abstract Fibre and textile reinforced ceramic composites with silicon carbide as matrix material are gaining increasing importance for complexly loaded structures in high-temperature and tribological applications. Besides improving the strength, the main target of the reinforcement is to increase the composite toughness. Furthermore, using an adapted reinforcement an optimized thermo-mechanical property profile and an adaptation of the tribological behaviour of the anisotropic composite can be achieved. Therefore a specific arrangement of the fibres, the matrix and the fibre matrix interface have to be developed. The objective of this paper is to present the anisotropic mechanical material properties of different fibre and textile reinforced ceramics which were experimentally determined in adapted material tests. Furthermore a detailed investigation of the tribological behaviour of ceramic composite was performed using pin-to-disk tests. The results show clearly, that the material behaviour of fibre ceramic composites is essentially depending on the production procedure. Whereas the elastic structural behaviour of C fibre reinforced SiC ceramics made by the chemical-vapour-infiltration-technique is nearly isotropic, liquid-silicon-infiltrated SiC materials show a high degree of anisotropy, which has to be principally considered within the design process of fibre ceramic structures. The tribological tests indicate that reinforced ceramics exhibit an excellent tribological behaviour with low wear rates and coefficients of friction. In further studies adapted material pairing has to be developed for tribological applications. Key words: ceramic composites, mechanical behaviour, tribological behaviour