Composite surface on a steel substrate

Details Composite surface on a steel substrate Composite surface on a steel substrate

C - Chemistry, Metallurgy

23

C

C23C 30/00 (2006.01)

Patent

CA 2540344

A composite surface having a thickness from 10 to 5,000 microns comprising a spinel of the formula MnxCr3_xO4 wherein x is from 0.5 to 2 and oxides of Mn, Si selected from the group consisting of MnO, MnSiO3, Mn2SiO4 and mixtures thereof which are not prone to coking and are suitable for hydrocarbyl reactions such as furnace tubes for cracking.

Cette invention concerne une surface composite présentant une épaisseur comprise entre 10 et 5000 microns et comprenant un spinelle représenté par la formule Mn¿x?Cr¿3-x?O¿4?dans laquelle x représente un nombre compris entre 0,5 et 2 et des oxydes de Mn et de Si sélectionnés dans le groupe comprenant MnO, MnSiO¿3?, Mn¿2?SiO¿4? et des mélanges de ceux-ci qui ne tendent pas à se cokéfier et qui conviennent pour des réactions hydrocarbyliques, par exemple pour les tubes d'un four de craquage.

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