Carbon Residue Studies with a Micro Carbon Residue Tester.
Final rept. Nov 84-Oct 85,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH AERO-PROPULSION LAB
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A test procedure for the coking propensity of gas turbine lubricants was developed using the Micro Carbon Residue Tester-100 MCRT-100. The MCRT-1009, a microprocessor controlled heating unit, was evaluated for its ability to determine carbon residue in weight percent of synthetic gas turbine lubricants under controlled static conditions various timetemperature profiles and selected gas atmospheres. The purpose was to yield information on the amount of deposit remaining in glass vials after a measured volume of lubricant had been exposed to different degrading environments, varying the parameters of temperature, gas air or nitrogen, and exposure time. During a test, several processes occur simultaneously. The major effect is volatilization of the lubricant. Substantial oxidation and thermal degradation of the lubricant also occurs, which forms residue in the glass vials. The degradation of the lubricant is not completely realistic because the evaporated oil is caught in the condensate trap of the MCRT-100, whereas condensate returns to the bulk oil in an engine and affects viscosity, acidity, and the degradation of the lubricant.
- Lubricants and Hydraulic Fluids