Blast-furnace tuyere made of copper or copper alloy provided with a surface coating and advantages of the surface of such a tuyere

摘要

P & this nozzle of a blast furnace, copper or copper alloy is provided with a surface coating 1 composed of a sintered layer of a mixture of al2 o 3, zro2 or other metal oxide powder, at point dystectique, of a powder of the alloy fe.sub.0.8 - a 1 and of a powdered alloy of copper - fe - al, this layer directly covers the base metal 2 which comprises - even a surface layer 20 made of copper or copper alloy cemented by diffusion of al and fe / p