Method and apparatus for manufacturing molded articles of alloye

Details Method and apparatus for manufacturing molded articles of alloye Method and apparatus for manufacturing molded articles of alloye

1982-05-03

1984-10-23

Lechart, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Plural heating steps including sintering

419 36, 419 37, 419 44, 419 53, 419 55, 419 58, 425 78, B22F 316

Patent

active

044787901

ABSTRACT:
A method of manufacturing molded articles of metal alloys, especially of nickel-base alloys, chromium-base alloys, titanium-base alloys, and dispersion-hardened alloys. A powder of the alloy, or a blend of powders of alloy constituents, is mixed with one or more plastics, selected from thermoplastics, duroplastics, and internal lubricants to form an injectionable granulate compound, the plastic content amounting to about 30% to 50% by volume. The compound is prepared by dissolving the plastic in a solvent which will not attack the base material of the alloy, and by blending it with the metal powder, after which the solvent is evaporated. The injectionable granulate compound is then injection molded to form a molded article. By heat treatment at 600.degree. C. or below in inert gas the plastic is eliminated from the molded article. The article is then sintered. To improve its strength, the article may subsequently be subjected to hot isostatic pressing. This improves the mechanical properties (especially fatigue strength) of molded articles.

REFERENCES:
patent: 2593943 (1952-04-01), Wainer
patent: 4113480 (1978-09-01), Rivers
Lenel, F. V.; Powder Metallurgy, Principles and Applications, 1980, pp. 329-333.

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