TECHNIQUE EVALUATING THERMAL OXIDIZING STABILITY OF OILS FOR AIRCRAFT GAS-TURBINE ENGINES Russian patent published in 2000 - IPC

FIELD: study of lubrication oils. SUBSTANCE: values of specific dielectric losses of starting P_и and oxidized P₀ oils are used in the capacity of informative indicators in process of evaluation of thermal oxidizing stability of oils for aircraft gas-turbine engines. With this in mind the loss tangent of dielectric of samples of starting tgδ_и and working tgδ₀ oils and value of capacitance of cell with samples of starting C_и and oxidized C_o oils are measured. Measurements are taken at temperature of sample not below 80±1,5^oC for mineral oils and not below 60±1,5^oC for synthetic oils. Thermal oxidizing stability is evaluated by value of relative dissipation power of specific dielectric losses found by dependence obtained experimentally. EFFECT: enhanced authenticity of evaluation of stability of aircraft oils for gas-turbine engines and diminished time for its determination. 3 dwg, 3 tbl