Oxide dispersion strengthened heat resisting powder metallurgy a

Details Oxide dispersion strengthened heat resisting powder metallurgy a Oxide dispersion strengthened heat resisting powder metallurgy a

1997-04-04

1999-11-23

Wyszomierski, George

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 20, 75338, B22F 300

Patent

active

059894911

ABSTRACT:
A process for producing an oxide dispersion strengthened heat resisting powder metallurgy alloy, characterized in that (1) zirconium and/or a rare earth element, such as yttrium, cerium, or lanthanum, are previously added as an oxide former element to a molten mother alloy, (2) an atomizing gas composed of an argon or nitrogen gas containing not more than 5.0% by volume of oxygen is used in the step of gas-atomizing the molten mother alloy, and (3) in the step of consolidating and molding the gas-atomized alloy powder by rolling, forging, HIP, or hot extrusion, the alloy powder is sieved to a particle diameter of not more than 110 .mu.m before this step. The oxide dispersion strengthened heat resisting powder metallurgy alloy is characterized in that (1) zirconium and/or a rare earth element, such as yttrium, cerium, or lanthanum, are contained in an amount of 0.05 to 3.0% by weight and (2) the powder metallurgy consolidated, molded product prepared by consolidation of the powdery metallurgy alloy contains 0.01 to 0.5% by weight of oxygen.

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patent: 5073409 (1991-12-01), Anderson et al.

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