A method and an installation for densifying porous...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 16/04 (2006.01) C04B 35/83 (2006.01) C04B 41/45 (2006.01) C23C 16/455 (2006.01) C23C 16/44 (2006.01)

Patent

CA 2471672

Substrates for densification are loaded in a loading zone of an oven and heated in the oven so as to be raised to a temperature at which the desired matrix material is formed from the precursor gas(es) contained in a reactive gas admitted to one end of the oven. After it has entered into the oven, the reactive gas is heated by passing it through a gas heating zone situated upstream from the loading zone in the flow direction of the reactive gas in the oven. In the invention, the reactive gas is preheated prior to entering into the oven so that on entering into the oven it is brought to an intermediate temperature between ambient temperature and the temperature to which the substrates are heated.

Des substrats ô densifier sont chargés dans une zone de chargement d'un four et chauffés dans le four afin d'être portés à une température à laquelle le matériau de matrice souhaité est formé à partir du ou des précurseurs gazeux contenus dans un gaz réactif admis à une extrémité du four. Après son entrée dans le four, le gaz réactif est chauffé par passage dans une zone de chauffage de gaz située en amont de la zone de chargement, dans le sens d'écoulement du gaz réactif dans le four. Selon l'invention, le gaz réactif est préchauffé avant entrée dans le four pour être amené, à son entrée dans le four, à une température intermédiaire entre la température ambiante et la température de chauffage des substrats.

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