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Lifetimes of Multiply Alkylated Cyclopentane Oil in Contact with Various Metals, Evaluated with Vacuum Spiral Orbit TribometerThe dependence of the lifetimes of small quantities of a Multiply Alkylated Cyclopentane (MAC) lubricant oil, Pennzane (Registered Trademark) 2001A (Nye Lubricants, Inc.), in rolling and sliding contact with different metals was evaluated with a vacuum spiral orbit tribometer. The metals were the bearing alloys 52100 steel, 440C steel, 17-4 PH steel and Nitinol 60 and the elements chromium, vanadium and titanium. The lifetimes of the lubricant oil on different metals fell into distinct groups with 52100 greater than 440C approx. Nitinol 60 greater than 17-4 PH for the order of the lifetimes of the steels and chromium greater than vanadium greater than titanium for the order of the lifetimes for the elements. The limited life of the small quantities of oil is assumed to be due to its consumption by the tribochemical reaction of the oil with the different metal bearing materials. The lifetimes are then inversely related to the reaction rates of the oil molecules with the various metals: the longest life of 52100 steel having the lowest reaction rate and the shortest life of titanium having the highest reaction rate. Mechanisms for the tribochemical reactions are discussed.
Document ID
20180002982
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Pepper, Stephen V.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
May 21, 2018
Publication Date
May 1, 2018
Subject Category
Chemistry And Materials (General)
Report/Patent Number
GRC-E-DAA-TN53450
E-19494
NASA/TM-2018- 219869
Funding Number(s)
WBS: WBS 869021.05.03.05.34
CONTRACT_GRANT: 80LARC17C0001
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
lubrication
mechanisms
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