The paper presents the description and analysis of the results obtained in the investigation performed on disc-ball tribotester T-11. Samples of 100Cr6 (European) steel were tested, while as a lubricant, liquid crystalline mixtures in nematic as well as smectic A, B and E phases were used. The friction force and the wear of sample and counter-sample were measured. The analysis of values of friction coefficients has shown that the friction coefficient of liquid crystalline mixtures is lower than that of paraffin oil. Nematic mixtures have a low friction coefficient under a load of 50 N and smectic B mixtures have low friction coefficient under 20 N, 30 N and 40 N load.

The paper presents description and analysis of the results obtained in the investigation performed on a disc-ball tribotester T-11. Samples of 100Cr6 steel were tested, while as lubricant the mixtures of paraffin oil, with addition of 0.5%, 1%, and 2% of liquid crystalline compounds, from two homologous series defined with nOBCAB and nCBB symbols, were used. The friction force and wear of a sample and a counter-sample were measured. The improvement in tribological and anti-wear properties was found for all mixtures in relation to paraffin oil. The best tribological properties and the best wearability were obtained for mixtures with a compound 8CBB. This compound differs from the others in formation of different liquid crystalline phases.

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