METODO DI FORMAZIONE DI ARTICOLI CON COMPOSIZIONE IN LEGA VARIABILE

摘要

A method of forming a structure having multiple alloy properties involves spray forming and employs a single alloy system which is subject to modification by addition of modifying elements. The initial part of the structure is made of the alloy (16) by application to the substrate without the modifiers present. The modifiers (32) are added to mix with and dissolve in the alloy in a dispensing crucible (12) supplying the spray forming operation and the coating operation is then continued. The latter portions of the structure have modified alloy content and properties which are modified based on the modification of alloy content. The metal melt may be of a nickel base superalloy and the modifier metal may be aluminium.