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Among the various methods used for increasing the durability of ceramics, the most significant improvement in stopping the spread of cracks and in holding together areas of extended damage is achieved through the incorporation of a fibrous network (using long fibres). In the specific case of composites with a ceramic matrix, the distortion and constraint to breakage of a matrix is inferior to that of fibres. So when the distortion applied to the composite exceeds the breakage distortion of the matrix, the matrix cracks and the load tension is transferred to the fibres. In order for this to happen the interface must be the result of a compromise between an adhesion that is sufficiently weak to avoid breaking the fibres and an adhesion that is strong enough to ensure the transfer of load tension to the fibres. The important parameters governing interfacial properties (the properties of the components, residual thermal contents, chemical reactions at the interfaces and the incorporation of an interphase) are discussed for composites C/Si(3)N(4) and SiC/Si(3)N(4).

Additional information

Authors: VEYRET J B, JRC Petten (NL);PLUNKETT L, JRC Petten (NL);BULLOCK E, JRC Petten (NL)
Bibliographic Reference: Paper presented: Symposium Surfaces et Interfaces des Matériaux Avancés, Montréal (CA), October 2-4, 1996
Availability: Available from (1) as Paper EN 40308 ORA
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