Method of making a fecral material and such material

Details Method of making a fecral material and such material Method of making a fecral material and such material

B - Operations, Transporting

22

F

B22F 9/08 (2006.01) C22C 33/02 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01) C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01)

Patent

CA 2392719

A method of producing an FeCrAl material by gas atomisation, wherein in addition to containing iron (Fe), chromium (Cr) and aluminium (Al) the material also contains minor fractions of one or more of the materials molybdenum (Mo), hafnium (Hf), zirconium (Zr), yttrium (Y), nitrogen (N), carbon (C) and oxygen (O). The invention is characterised by causing the smelt to be atomised to contain 0.05-0.50 percent by weight tantalum (Ta) and, at the same time, less than 0.10 percent by weight titanium (Ti). According to one highly preferred embodiment, nitrogen gas (N2) is used as an atomising gas to which a given amount of oxygen gas (O2) is added, said amount of oxygen gas being such as to cause the atomised powder to contain 0.02-0.10 percent by weight oxygen (O) at the same time as the nitrogen content of the powder is 0.01-0.06 percent by weight. The invention also relates to a high temperature material.

L'invention concerne un procédé de production d'un matériau de FeCrAl par atomisation gazeuse. En plus de renfermer du fer (Fe), du chrome (Cr) et de l'aluminium (Al), le matériau contient également des petites fractions d'au moins une des matières suivantes: du molybdène (Mo), de l'hafnium (Hf), du zircone (Zr), de l'yttrium (Y), de l'azote (N), du carbone (C) et de l'oxygène (O). Cette invention est caractérisée en ce que la fusion à atomiser contient entre 0,05 et 0,50 pour-cent en poids de tantale (Ta) et en même temps moins de 0,10 pour-cent en poids de titane (Ti). Selon un mode de réalisation préféré, le gaz d'azote (N2) est utilisé en tant que gaz d'atomisation auquel une quantité donnée de gaz d'oxygène (O2) est ajoutée, ladite quantité de gaz d'oxygène étant telle qu'elle permet à la poudre atomisée de contenir entre 0,02 et 0,10 pour-cent en poids d'oxygène (O) tandis que le contenu d'azote de la poudre est compris entre 0,01 et 0,06 pour-cent en poids. Ladite invention a également trait à un matériau résistant à des hautes températures.

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