Special Metals Corporation

Sanford Baranow

A process for preparing metal having a substantially uniform dispersion of hard filler particles. The process includes the steps of: admixing particles of a first metallic component with oxide particles having a negative free energy of formation at 1000.degree. C. of at least as great as that of aluminum oxide, and with a dissimilar second metallic component; and of milling for a period of time sufficient to produce powder characterized by a substantially uniform dispersion of hard filler particles and heterogeneous agglomerations of at least two metallic components. The first metallic component is from the group consisting of nickel, cobalt, iron and alloys thereof. Both the first and the second metallic component have an average particle size of less than 10 microns.

Method of making oxide dispersion strengthened powder

Oxide dispersion-strengthened metal having from 18 to 35% chromium, 3 to 7% aluminum, 0.2 to 3.0% of an oxide dispersoid, 10 to 45% nickel and at least 30% cobalt. The oxide dispersoid has a negative free energy of formation at 1000.degree. C of at least as great as that of aluminum oxide.

Dispersion-strengthened cobalt-bearing metal

A process for preparing metal having a substantially uniform dispersion of hard filler particles. The process includes the steps of: admixing metal powder and oxide particles having a negative free energy of formation at 1000.degree. C of at least as great as that of aluminum oxide; and of milling the mixture for a period of time sufficient to effect a substantially uniform dispersion of said oxide particles in said metallic powder. Milling is performed in an atmosphere containing sufficient oxygen to substantially preclude welding of particles of said metallic powder to other such particles. After milling, the dispersion strengthened powder is heat treated to remove excess oxygen therefrom.

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Sauquoit, NY, United States of America

Sanford Baranow