Iron-chromium-aluminum alloy

Abstract

The invention relates to an iron-chromium-aluminum alloy having a good oxidation resistance, comprising (in % by mass) 2.5 to 5.0% Al, 10 to 25% Cr, 0.05 0.8% Si, and additions of >0.01 to 0.1% Y and / or >0.01 to 0.1% Hf and / or >0.01 to 0.2% Zr and / or >0.01 to 0.2% Cerium mischmetal (Ce, La, Nd) as well as production-associated impurities.

Description

BACKGROUND [0001] 1. Field of the Invention [0002] The invention relates to an iron-chromium-aluminium alloy having good oxidation resistance. [0003] 2. Description of Related Art [0004] Although the catalytic converter is the rule in four-stroke-engines today, the development of catalytic converters for Diesel and two-stroke engines is still in its beginnings. In four-stroke-engines, alloys are used which are similar to those described in EP-A 0387 670: with (in % by weight) 20-25% Cr, 5-8% Al, max. 0.01% P, max. 0.01% Mg, max. 0.5% Mn, max. 0.005% S, residual iron and unavoidable impurities and, if required, alloying elements, such as 0.03-0 08% Y, 0.004-0.008% N, 0.02-0.04% C, 0.035-0.07% Ti, 0.035-0.07% Zr. Since production by traditional methods, namely conventional pouring of the alloy and subsequent hot and cold deformation, is very difficult where aluminium contents of below 6% by weight are concerned and in cases of higher aluminium contents is no longer workable in large-s...

AI Technical Summary

Benefits of technology

"The present invention provides an alloy for use in high-temperature applications that has good oxidation resistance. The alloy is made of iron, chromium, and aluminum with specific amounts of aluminum, chromium, and additions of reactive elements such as yttrium, cerium, and zirconium. The alloy can be produced in large scales and can be used in various applications such as in exhaust systems of diesel engines, metallic catalytic converters, glow plugs, and more. The alloy can be easily fabricated into semi-finished articles and can even be produced as foils or spraying wires. The technical effects of the invention are improved oxidation resistance and versatility in applications."

Problems solved by technology

Since production by traditional methods, namely conventional pouring of the alloy and subsequent hot and cold deformation, is very difficult where aluminium contents of below 6% by weight are concerned and in cases of higher aluminium contents is no longer workable in large-scale productions, alternative production methods have been developed.