Friction and Wear of Nickel-Aluminum Alloys and Some Sulfur-Modified Steels in Vacuum to 10-9 Millimeter of Mercury
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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The friction, wear, and welding characteristics of 52100, 440-C stainless steel, and M-2 tool steel with and without the addition of 0.4 to 0.5 percent sulfur were studied in vacuum l0-9 mm Hg. Studies were also conducted with simple nickel-aluminum binary alloys in vacuum. Friction and wear studies were made with a hemispherical 3l8-in.-rad. rider, which slides in a circular path on the flat surface of a rotating metal disk of the same metal. The specimens in vacuum had a load of 1000 grams 2.2 lb, a sliding velocity of 75 to 1980 feet per minute, and a temperature of 750 F The addition of 0.4 to 0.5 percent sulfur to 52100, 440-C, and M-2 reduced friction, wear, and welding normally encountered with these alloys in vacuum. With nickel-aluminum binary alloys friction and wear improved with the addition of aluminum to nickel. A 18.4-percent-aluminum - nickel alloy exhibited lower friction and less wear and metal transfer in vacuum than did two commercial nickel-base alloys.
- Organic Chemistry
- Properties of Metals and Alloys