Enhancement of thermal stability of porous bodies comprised...

B - Operations – Transporting – 22 – F

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B22F 3/11 (2006.01)

Patent

CA 2632883

A method for treating a porous item (20) constructed of metal powder, such as a powder made of Series 400 stainless steel, involves a step of preheating the porous item to a temperature of between about 700 and 900~ C degrees in an oxidizing atmosphere and then sintering the body in an inert or reducing atmosphere at a temperature which is slightly below the melting temperature of the metal which comprises the porous item. The thermal stability of the resulting item is enhanced by this method so that the item retains its porosity and metallic characteristics, such as ductility, at higher (e.g. near- melting) temperatures.

L'invention concerne un procédé pour le traitement d'un article poreux (20) construit à partir de poudre métallique, telle une poudre d'acier inoxydable de série 400, et comprend l'étape qui consiste à préchauffer l'article poreux à une température entre 700 et 900 °C sous une atmosphère oxydante, puis à fritter le corps sous une atmosphère inerte ou réductrice à une température légèrement inférieure à la température de fusion du métal qui forme l'article poreux. La stabilité thermique de l'article résultant est améliorée par ce procédé de sorte que l'article retient sa porosité et ses propriétés métalliques, telles la malléabilité à des températures plus élevées (par exemple, proches de la température de fusion).

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