Alloys and Metal Articles Coated therewith.

摘要

1,150,286. Coating with metals. E.I. DU PONT DE NEMOURS & CO. May 3, 1966, No. 19550/66. Headings C7A and C7F. A protective metal coating (e. g. applied to a Fe, Ni or Co base alloy article) comprises an alloy containing at least two heavy transition elements (i.e. selected from Fe, Co, Ni, Ru, Rh, Re, Os, Ir, Pt, Pd, Mn, Cr, Mo, W, U, V, Nb, Ta, Ti, Zr, Hf, Th, Sc, Y, La and Ce) forming at least 60 atomic per cent of the alloy, the ratio of the largest to the smallest atomic radii thereof being in the range 1À05-1À5 and from 30-85% by volume of the alloy being present as Laves phase the remainder being the matrix which is softer than the Laves phase. Exemplary alloy, for the coatings include:- W 51, Ni 40 Si 9, Ta 52, Co 38, Si 10, Mo 52 Fe 30 Si 18, Mo 36 Fe 46 Ge 18 and Mo 36 Ni 10 Fe 36 Si 18. The coatings may be applied by forming the appropriate alloy (as by ore melting in an inert atmosphere, powdering it, heating the substrate with a layer of the powder thereon (e.g. applied by metal spraying or by brushing, dipping or spraying with a slurry of the metal in a temporary binder) in a non-oxidizing atmosphere to the incipient melting point of the alloy and cooling it at such a rate as to give a matrix in the coating alloy which is softer than the matrix phase therein. The coating may also be applied to bodies of Ti, Zr, Nb, Ta, Mo, W, Cr, Cu and U and may be applied by roll cladding hot dipping or resin bonding of a sheet thereof to the base.