Main features of thermostructural composites for space, aeronautic and industrial applications

ISSN： 1568-5519

Source： Advanced Composite Materials, Vol.8, Iss.1, 1999-01, pp. : 47-53

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Abstract

Thermostructural Composites are made of inorganic fibers, like carbon or ceramic fibers, associated with an inorganic matrix. So, they are able to sustain high temperatures. Many combinations and even more processing routes may be implemented. Fibers and matrix are usually brittle materials, but the composite may present a much higher toughness and a good strain to failure. Mechanical loads on thermostructural composites generate cracks which propagate under monotonous or alternate loadings. The crack pattern governs most of the composite properties. Furthermore, it allows the penetration of oxidative or corrosive agents, thus affecting the long-term properties. Design of parts must take into account the geometrical singularities, where fiber orientations, fiber ratio and matrix content may vary rapidly. Special tests on technological samples are the more efficient way to ascertain the design in these areas. Thermostructural composites are more and more used in high temperature and aggressive atmospheres, because they are light and damage-tolerant.