METHOD OF DETERMINING ANTIWEAR PROPERTIES OF OIL Russian patent published in 2012 - IPC G01N3/56 G01N33/30 

FIELD: physics.

SUBSTANCE: oil sample is divided into two portions, the first of which has constant mass and is tested in the presence of air with agitation at optimum temperature selected depending on the base of the oil. At equal intervals, the sample of the oxidised oil is photometered and light flux absorption coefficient is determined. The sample is then tested for antiwear properties and the wear scar diameter during oxidation is determined. The second portion of the sample with constant mass is divided into equal portions, each heated at atmospheric pressure with vapour condensation and collection of the condensate. For each next portion of the oil sample, test temperature is raised by a constant value. After each temperature test, the oil sample is photometered. The light flux absorption coefficient is determined. The sample is tested for antiwear properties and the wear scar diameter during thermal decomposition is determined. Curves of the wear scar diameter versus light flux absorption coefficient of the test oil during oxidation and thermal decomposition are plotted and the wear scar diameter is determined from each curve at the same values of light flux absorption coefficient. The coefficient of influence of thermal decomposition K_v is then determined as a ratio of the wear scar diameter during thermal decomposition to the wear scar diameter during oxidation of the oil. A curve of the coefficient of influence of thermal decomposition versus the light flux absorption coefficient is plotted, wherein for K_v>1, antiwear properties are determined from thermal decomposition, and for K_v<1 antiwear properties are determined from oxidation of oil.

EFFECT: high information content of the method when determining antiwear properties of oil based on the effect of oxidation and thermal decomposition products.

2 tbl, 6 dwg