Corrosion-resistant powder-metallurgy stainless steel powders and compacts therefrom

Patent · Tue Dec 23 04:00:00 EST 1980

OSTI ID:6799455

Klar, E; Ro, D H; Whitman, C I

Disclosed is a process for improving the corrosion resistance of a stainless steel powder or compact thereof wherein the powder is produced by atomizing a melt of metals in an oxidizing environment whereby the resulting stainless steel powder is surface-enriched in silicon oxides. The process comprises adding an effective proportion of modifier metal to the melt prior to the atomization, the modifier metal selected from the group consisting of tin, aluminum, lead, zinc, magnesium, rare earth metals and like metals capable of enrichment about the surface of the resulting atomized stainless steel powder and effective under reductive sintering conditions in the depletion of the silicon oxides about the surface; and sintering the resulting atomized powder or a compact thereof under reducing conditions, the sintered powder or compact thereof being depleted in the silicon oxides and the corrosion resistance of the powder or compact thereof being improved thereby.

• Assignee: Scm Corp
• Patent Number(s): US 4240831
• OSTI ID: 6799455
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHROMIUM ALLOYS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
LEAD ADDITIONS
LEAD ALLOYS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
OXIDES
OXYGEN COMPOUNDS
POWDERS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
STAINLESS STEELS
STEELS
TIN ADDITIONS
TIN ALLOYS
ZINC ADDITIONS
ZINC ALLOYS