Tooling using thermostructural composite materials...

Details Tooling using thermostructural composite materials... Tooling using thermostructural composite materials...

C - Chemistry, Metallurgy

04

B

C04B 41/90 (2006.01) C04B 41/45 (2006.01) C04B 41/52 (2006.01) F27D 1/00 (2006.01) F27D 5/00 (2006.01)

Patent

CA 2187747

An interposition layer (12) is formed on the outside surface of a part (10) made of thermostructural composite material containing carbon, and a metal case is formed by casting molten metal (22) around the part provided with its interposition layer. The interposition layer has closed porosity and it is proof against the metal of the case, such that shrinkage of the metal during cooling is absorbed by compacting or collapsing the porosity of the interposition layer, thereby preserving the integrity of the metal case, and the interposition layer constitutes a diffusion barrier preventing eutetics forming by contact between the metal of the case and the composite material.

On forme une couche d'interposition (12) sur la surface extérieure d'une pièce (10) en matériau composite thermostructural contenant du carbone, et on forme une enveloppe métallique par coulée de métal en fusion (22) autour de la pièce munie de la couche d'interposition. La couche d'interposition présente une porosité fermée et est étanche vis-à-vis du métal de l'enveloppe, de sorte que le retrait du métal lors du refroidissement est absorbé par affaissement ou effondrement de la porosité de la couche d'interposition, préservant ainsi l'intégrité de l'enveloppe métallique, et la couche d'interposition constitue une barrière de diffusion empêchant la formation d'eutectiques par contact entre le métal de l'enveloppe et le matériau composite.

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