Societe Nationale Industrielle Et Aerospatiale

Jean-Michel Lequertier

Sylvie His

Fasteners composed of a composite material constituted by a ceramic matrix reinforced with refractory fibers for use in the assembling and dissembling of structures likely to be subjected to high temperatures. The fasteners, which can comprise screws, nuts and bolts, can include a threaded rod, possibly comprising a head, and at least one nut cooperating with the rod. The threads of the rod and the nut are round threads. Further, the male and female portions of the threads have the same theoretical profile to within machining tolerance and functional clearance.

Fasteners made of composite material of a ceramic matrix reinforced with

A process for the production of a carbon-containing composite material part protected against oxidation. The process consists of forming a fibrous preform or blank of the part by superimposing layers of carbon-containing fibres (12), the fibres of each layer being parallel to one another and the fibres of the N outermost layers being oriented in the same plane in accordance with a first or a second direction, with N.gtoreq.2, said directions being perpendicular to one another. The preform is densified by a carbon-containing densification material. The N-1 outermost densified layers of the densified preform are chemically reacted, at a temperature above ambient temperature, with at least one chemical compound in order to form an outer coating of refractory carbonitride or carbide. The assembly is then cooled in order to form in the outer coating cracks (28) in the direction (z) of its thickness (e) issuing towards the outside, said cracks being oriented in said directions (x,y) and defining between them parallelepipedic carbide or carbonitride blocks (30), and the resulting cracks are then filled.

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St Aubin de Medoc, France

Jean-Michel Lequertier