C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 19/07 (2006.01) C03B 37/095 (2006.01) C22F 1/10 (2006.01)
Patent
CA 2272462
The invention concerns an alloy based on cobalt provided with mechanical resistance to high temperature, in particular in an oxidising or corrosive environment, comprising essentially the following elements (the proportions mentioned being expressed in weight percentage of the alloy): 26 to 34 % of Cr; 6 to 12 % of Ni; 4 to 8 % of W; 2 to 4 % of Ta; 0.2 to 0.5 % of C; less than 3 % of Fe; less than 1 % of Si; less than 0.5 % of Mn; less than 0.1 % of Zr; the remainder consisting of cobalt and unavoidable impurities, the mol ratio of tantalum relative to carbon being of the order of 0.4 to 1. The invention is applicable to articles mechanically stressed at high temperature, in particular articles used for the preparation and hot transformation of glass.
L'invention concerne un alliage à base de cobalt doué de résistance mécanique à haute température, en particulier en milieu oxydant ou corrosif, comprenant essentiellement les éléments suivants (les proportions étant indiquées en pour-centage pondéral de l'alliage): 26 à 34 % de Cr, 6 à 12 % de Ni, 4 à 8 % de W, 2 à 4 % de Ta, 0,2 à 0,5 % de C, moins de 3 % de Fe, moins de 1% de Si, au moins de 0,5 % de Mn, au moins de 0,1 % de Zr, le reste étant constitué par du cobalt et des impuretés inévitables, le rapport molaire du tantale par rapport au carbone étant de l'ordre de 0,4 à 1. Application à des articles sollicités mécaniquement à haute température, notamment des articles utilisables pour l'élaboration ou la transformation à chaud du verre.
Bernard Jean-Luc
Berthod Patrice
Liebaut Christophe
Goudreau Gage Dubuc
Isover Saint-Gobain
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