| 摘要 |
The process consists in producing a fibrous preform of the article by superposing sheets of carbonaceous fibres (12), the fibres in each sheet being mutually parallel and the fibres of the outermost N sheets being oriented in the same plane in a first or a second direction, with N>/=2, these directions being mutually perpendicular; densifying the preform with a carbonaceous densifying material (26); causing the outermost N-1 densified sheets of the densified preform to react chemically at a temperature above room temperature with at least one chemical compound to form an external coating (24) of refractory carbide or carbonitride; allowing the whole to cool to form fissures (28) in the external coating in the direction (z) of its thickness (e) and opening to the outside, these fissures being oriented in the said directions (x, y) and defining with each other parallelepipedal slabs (30) of carbide or carbonitride, and filling the fissures. <IMAGE> |
