Cast product having alumina barrier layer

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 30/00 (2006.01) C22C 19/05 (2006.01) C22C 27/06 (2006.01) C22C 38/44 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2755886

A cast product for use in high temperature atmosphere comprising a cast body of a heat-resistant alloy comprising of, in mass percent, 0.05 to 0.7% of C, over 0% to up to 2.5% of Si, over 0% to up to 3.0% of Mn, 15 to 50% of Cr, 18 to 70% of Ni, 2 to 4% of Al, 0.005 to 0.4% of rare-earth elements, and 0.5 to 10% of W and/or 0.1 to 5% of Mo, the balance being Fe and inevitable impurities, and a barrier layer formed at a surface of the cast body to be brought into contact with said high temperature atmosphere, said barrier layer comprising an Al2O3 layer having a thickness of 0.5 µm or more wherein at least 80 area % of the outermost surface thereof is Al2O3, and said cast product having Cr-based particles dispersed at an interface between the Al2O3 layer and the cast body at a higher Cr concentration than that of a matrix of the alloy.

L'invention porte sur un produit coulé qui est utilisé dans une atmosphère haute température et qui comprend : un corps coulé en alliage résistant à la chaleur qui contient, en % en masse, 0,05-0,7 % de C, plus de 0 % mais 2,5 % ou moins de Si, plus de 0 % mais 3,0 % ou moins de Mn, 15-50 % de Cr, 18-70 % de Ni, 2-4 % d'Al, 0,005-0,4 % d'un élément des terres rares, et 0,5-10 % de W ou 0,1-5 % de Mo, le complément étant constitué par Fe et les impuretés inévitables ; et une couche barrière qui est formée sur la surface du corps coulé, ladite surface étant amenée en contact avec une atmosphère à haute température. La couche barrière est une couche d'Al2O3 ayant une épaisseur de pas moins de 0,5 µm, et pas moins de 80 % en aire de la surface la plus à l'extérieure de la couche barrière sont composés d'Al2O3. Dans l'interface entre la couche d'Al2O3 et le corps coulé, sont dispersées des particules à base de Cr ayant une concentration en Cr supérieure par rapport à la matrice d'alliage.

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