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  • 1
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    Unknown
    Topological reaction rate measurements related to scuffing (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A ball-on-plate (both consisting of hardened M-50 steel) sliding elastohydrodynamic contact was run with trimethylolpropane triheptanoate (TMPTH) with and without tricresyl phosphate (TCP). The contact area of the plate was optically profiled with a phase-locked interference microscope (PLIM) both before and after exposure to alcoholic hydrochloric acid. As scuffing was approached, the profile within the contact region changed more rapidly after the acid treatment; after scuffing, it assumed a constant high value. A metallurgical phase found in the scuff mark was apparently responsible for the high reactivity. The microscopic profile changes (sensitivity, + or - 3 nm (+ or - A) in depth) involved primarily the small asperities (radius, 3 microns); the larger ones were unaffected. Soaking the steel in TCP smoothed the fine structure of the surface profile but increased its reactivity toward alcoholic hydrochloric acid before sliding was started. Thus it would appear that PLIM examination could be used for screening potentially scuff-resistant materials.
    Keywords: METALLIC MATERIALS
    Type: ASLE Transactions; 27; 288-293;
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Surface profile changes of scuffed bearing surfaces (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A phase locked interference microscope capable of resolving depth differences to 30 A and planar displacements of 6000 A was constructed for the examination of the profiles of bearing surfaces without physical contact. This instrument was used to determine surface chemical reactivity by applying a drop of dilute alcoholic hydrochloric acid and measuring the profile of the solid surface before and after application of this probe. Scuffed bearing surfaces reacted much faster than unscuffed ones, but bearing surfaces which had been previously exposed to lubricants containing an organic chloride reacted much more slowly. In a separate series of experiments, a number of stainless steel plates were heated in a nitrogen atmosphere to different temperatures and their reactivity examined later at room temperature. The change of surface contour as a result of the probe reaction followed an Arrhenius type relation with respect to heat treatment temperature. This result could have implications on the scuffing mechanism.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-83055 , E-1402 , NAS 1.15:83055 , Israel Conf. on Mech. Eng.; Jul 13, 1982 - Jul 14, 1982; Haifa; Israel
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Ellipsometric surface analysis of wear tracks produced by different lubricants (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A scanning ellipsometer with high spatial resolution was used to analyze wear tracks generated on M-50 surfaces operated in several lubricant formulations. These formulations included a pure ester base stock of trimethyol propane triheptanoate with additives of either benzotriazole (BTZ), dioctyldiphenylamine (DODPA), or tricresylphosphate (TCP). Results indicated that BTZ and TCP produced patchy oxide surface films consisting mainly of Fe304. DOPDA produced a much more uniform oxide film. These findings may explain the tendency of lubricant formulations containing TCP to scuff more readily than those containing only antioxidants.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-87142 , E-2769 , NAS 1.15:87142 , Tribology Conf.,; Oct 08, 1985 - Oct 10, 1985; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Topological reaction rate measurements related to scoffing (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A ball-on-plate (both consisting of hardened M-50 steel) sliding elastohydrodynamic contact was run with trimethylolpropane triheptanoate (TMPTH) with and without tricresyl phosphate (TCP). The contact area of the plate was optically profiled with a phase-locked interference microscope (PLIM) both before and after exposure to alcoholic hydrochloric acid. As scuffing was approached, the profile within the contact region changed more rapidly after the acid treatment; after scuffing, it assumed a constant high value. A metallurgical phase found in the scuff mark was apparently responsible for the high reactivity. The microscopic profile changes (sensitivity, + or - 3 nm (+ or - A) in depth) involved primarily the small asperities (radius, 3 microns); the larger ones were unaffected. Soaking the steel in TCP smoothed the fine structure of the surface profile but increased its reactivity toward alcoholic hydrochloric acid before sliding was started. Thus it would appear that PLIM examination could be used for screening potentially scuff-resistant materials.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-83486 , NAS 1.15:83486 , E-1810 , Joint Lubrication Conf.; Oct 18, 1983 - Oct 20, 1983; Hartford, CT; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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