Low pressure carbonitriding method for metal alloy parts

C - Chemistry – Metallurgy – 23 – C

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C23C 8/32 (2006.01) C23C 8/80 (2006.01)

Patent

CA 2326239

The invention concerns a method for carbonitriding metal alloy parts which consists in treating said parts with a fuel mixture consisting of ethylene and hydrogen and with a nitriding gas consisting of ammonia, under pressure less than 100 hPa and at a temperature of about 750 to 1050 DEG C. The invention is particularly advantageous for treating passivable and stainless steel since it enables to attain very high surface enrichment in nitrogen.

L'invention concerne un procédé de carbonitruration de pièces en alliage métallique consistant à soumettre lesdites pièces à l'action d'un mélange carburant constitué d'éthylène et d'hydrogène et à l'action d'un gaz nitrurant constitué d'ammoniac, sous une pression inférieure à 100 hPa et à une température d'environ 750 à 1050 °C. Il est particulièrement avantageux pour le traitement d'aciers passivables ou inoxydables car il permet d'atteindre des enrichissements superficiels en azote beaucoup plus élevés.

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