The Making of Nickel and Nickel-Alloy Shapes by Casting, Powder Metallurgy, Electroforming, Chemical Vapor Deposition, and Metal Spraying

摘要

The state of the art of making nickel and nickel-alloy shapes by methods other than machining from wrought materials is reviewed. The methods covered are casting, powder metallurgy, electroforming, chemical vapor deposition, and metal spraying. Of these methods, casting and electroforming are the most extensively used for making final shapes of nickel or nickel alloys. Powder-metallurgy methods are being used to make pure nickel strip for special applications. Special alloys such as nickel dispersion strengthened with throrium oxide, Monel, and others are made from powders in the forms of strip and extrusions. Nickel-alloy shapes are readily made by powder-metallurgy methods, and it is expected that the recently increased availability of prealloyed powders may result in more use of this versatile process. Chemical vapor deposition has found little application in making nickel shapes since it has little to recommend it over electroforming. Metal spraying has been essentially limited to application of wear-resistant and/or corrosion- and oxidation-resistant coatings to other metals. (Author)