GB568786A - A process for the manufacture of composite metal articles - Google Patents

Abstract

568,786. Coating and consolidating metals and alloys. JONES, W. D. July 1, 1942, No. 9044. [Classes 82 (i) and 82 (ii)] In the manufacture of composite metal articles, a mixture of reducible metal compound, e.g. oxides in powder form, is applied to a metal backing and is heated in the presence of a reducing agent to such a temperature that the compounds are reduced to metal and the metal particles are sintered to form a porous mass, which may be an alloy, bonded to the metal backing. The heating may be carried out in two stages, in the first of which the compounds are reduced to metal and in the second in which the sintering and bonding take place. Abrasive material may be mixed with the compounds and the composite article produced may be subsequently impregnated with pore-filling materials such as oils, or a low melting point metal or alloy, or a de-icing fluid. The mixture of compounds may be disposed between two metal backings to produce a composite article and a laminated structure may be built up from a number of alternating layers of powder and backing. In an example, a mixture of iron oxide and nickel oxide may be applied to a steel, nickel or copper backing and heated first to 475-575‹ C. in hydrogen and then at 980-1100‹ C. to produce an ironnickel alloy coating. Fluxes such as sodium fluoride, cryolite, borax, &c. and reducible compounds such as titanium hydride, to facilitate the reduction, may be added to the compounds before reduction as well as catalysts. The compounds may be mixed with a binder and sprayed on the backings, and'a solid reducing agent such as carbon may be used when it is also mixed with the powders. Specifications 567,970 and 568,294 are referred to.