Abstract: A blade for fluid catalytic cracking (FCC) flue hot gas expander with a layer of hard abrasive material localized on the blade tip that contributes to reducing the accumulation of FCC catalyst residuals in the expander.

Abstract: The impeller includes a main body with a root, a shroud and a plurality of blades connecting the root and the shroud. Protection elements are associated to the blades and constitute at least the front part of the blades. The protection elements may consist of separate bodies or may be grouped together to form one or more protection bodies. In an embodiment, the material of the protection elements is different from the material of the main body, and may be, for example, a cobalt base alloy having a chromium content greater than 20% or nickel base alloy having a chromium content greater than 12%.

Abstract: The impeller includes a main body with a root, a shroud and a plurality of blades connecting the root and the shroud. Protection elements are associated to the blades and constitute at least the front part of the blades. The protection elements may consist of separate bodies or may be grouped together to form one or more protection bodies. In an embodiment, the material of the protection elements is different from the material of the main body, and may be, for example, a cobalt base alloy having a chromium content greater than 20% or nickel base alloy having a chromium content greater than 12%.

Abstract: A high velocity spray method for treating the surface of a component, the method comprises the steps of heating a first portion of an inert gas up to a spray temperature comprised between 550° C. and 800° C.; preparing a powder material having a composition including Co at a mass percentage comprised between 15% and 70%; preparing a mixture between the powder material and a second portion of inert gas; mixing the first portion of inert gas and the mixture of gas and powder in a spray gun in order to create a spray jet; directing said spray jet towards the surface to be treated in order to deposit a coating of the material including Co.