Production of composite layer on the surface of an aluminum alloy substrate comprises arranging or introducing an additional material on the surface of the substrate, irradiating the additional material with a laser and solidifying the melt

摘要

Production of a composite layer (2) on the surface of an aluminum alloy substrate (1) comprises: arranging or introducing an additional material (5) on the surface of the substrate; irradiating the additional material with a laser (4) to melt the powder mixture and a surface part of the substrate; and solidifying the melt at a high cooling rate to form a fine homogeneous structure. Production of a composite layer (2) on the surface of an aluminum alloy substrate (1) comprises: arranging or introducing an additional material (5) made from a powder alloy mixture containing aluminum, silicon and at least 15 wt.% iron on the surface of the aluminum alloy substrate; irradiating the additional material with a laser (4) to melt the powder mixture and a surface part of the substrate; and solidifying the melt at a high cooling rate to form a fine homogeneous structure. Preferred Features: The iron in the alloy forms an intermetallic compound with aluminum or with silicon and aluminum. The iron is present in an amount of 15-30 wt.%. The alloy or powder mixture further contains copper, zinc and/or vanadium, and hard materials, preferably silicon carbide, tungsten carbide, titanium carbide or silicon nitride.