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The aim of this project was to develop uniaxial testing equipment for ceramic matrix composites (CMCs) under the highest possible vacuum and to determine the creep behaviour of these materials in general and the influence of interfacial phenomena in particular, in order to identify the main parameters and thus improve creep resistance. Tests were carried out on a bidirectional CMC, composed of alumina fibres and a CVI-deposited silicon carbide matrix. Several tensile tests were also carried out. Temperatures were in the range 950 C to 1100 C. The material under investigation showed high fracture strains of up to 0.7 % in tensile and 5.6 % in creep tests. Fracture times ranged from 0.6 h to 640 h. Each creep curve presented a primary, secondary and tertiary stage. Interfacial shear stress ranged from 3.6 to 9.3 MPa. The effect of the CMC's residual porosity on the results is discussed. A model for the composite's primary and secondary creep behaviour is proposed.

Additional information

Authors: ADAMI J-N, JRC Petten (NL)
Bibliographic Reference: EUR 14425 FR (1992) 280 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publications Department, I-21020 Ispra (Va.) (IT)
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