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The entrainment of long carbon fibres into a Si(3)N(4) ceramic matrix improves the fracture toughness and wear properties of the ceramic but introduces a chemical and physical instability resulting from interaction between the fibre and matrix phases. The mechanisms of toughening rely largely upon the formation of weak interphase bonding along the fibre-matrix interface and upon the residual thermal stresses arising from processing. From this, improved failure behaviour may be engineered by mechanical and chemical modification of the interface, achieved most effectively by the choice of reinforcement phase and by pre-coating of the fibres prior to fabrication of the composite. Flexural testing and microstructural TEM analysis were used to compare the effect of the various fibre and coating interlayers ( SiC, C/SiC).

Additional information

Authors: SABOURET E, JRC Petten (NL);VEYRET J B, JRC Petten (NL);BULLOCK E, JRC Petten (NL)
Bibliographic Reference: Paper presented: HTCM 2, Santa Barbara (US), August 21-24, 1995
Availability: Available from (1) as Paper EN 39127 ORA
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