Method and apparatus for low pressure case-hardening of...

C - Chemistry – Metallurgy – 23 – C

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C23C 8/22 (2006.01)

Patent

CA 2046052

On utilise un mélange carburant constitué d'hydrogène et d'éthylène à raison de 2 à 60 d'éthylène en volume et l'on chauffe le four entre 820° et 1100°C. L'installation comporte un four (50), dit é double vide, constitué d'uns cuve (S5) avec son dispositif intérieur de répartition des gaz cémentants, d'un espace annulaire (56) entourant la cuve, d'un couvercle traversé par des conduites de pompage et d'arrivée d'hydrogène (51) et d'éthylène (52) débouchant aux différents étages de la cuve en plusieurs endroits régulièrement répartis, des thermocouples (TC), un microordinateur (61). Application à des pièces d'automobiles.

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