Lifetimes of Multiply Alkylated Cyclopentane Oil in Contact with Various Metals, Evaluated with Vacuum Spiral Orbit Tribometer

Pepper, Stephen V

关键词: BEARING ALLOYS;    CHEMICAL REACTIONS;    FRICTION MEASUREMENT;    HARDNESS TESTS;    LUBRICATING OILS;    LUBRICANT TESTS;    PENTANES;    REACTION KINETICS;    TRIBOLOGY;    ADDITIVES;    LIFE SPAN;    OXIDES;    MOLECULAR STRUCTURE;    NITINOL ALLOYS;    TITANIUM;   

RP-ID  :  NASA/TM-2018- 219869,E-19494,GRC-E-DAA-TN53450

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The 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.