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  • 1
    Publication Date: 2019-06-28
    Description: Spur-gear surface fatigue tests were conducted with five lubricants using a single lot of consumable-electrode vacuum melted (CVM) AISI 9310 spur gears. The lot of gears was divided into five groups, each of which was tested with a different lubricant. The test lubricants are classified as either a synthetic hydrocarbon, mineral oil, or ester-based lubricant. All five lubricants have imilar viscosity and pressure-viscosity coefficients. A pentaerythritol base stock without sufficient antiwear additives produced a surface fatigue life pproximately 22 percent that of the same base stock with chlorine and phosphorus type additives. The presence of sulfur type antiwear additives in the lubricant did not appear to affect the surface fatigue life of the gears tested. No statistical difference in the 10-percent surface fatigue life was produced with four of the five lubricants.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-2419 , E-2183 , NAS 1.60:2419
    Format: application/pdf
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  • 2
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    In:  CASI
    Publication Date: 2019-06-27
    Description: Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
    Keywords: MATERIALS
    Type: LEW-11483
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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