Layers formed by boundary lubrication - detection by means of HF-impedance measurement

摘要

An electric measurement method has been developed in order to monitor the reactions of lubricants and the formation of boundary layers offering the possibility of indication of wear within tribo-systems. The results of experimental studies carried out on an oscillating friction and wear test machine will be presented. The measuring device consists of a HF-oscillator system (electronic circuit) which enables to monitor the electrical impedance between metallic elements of a lubricated tribo-system. It is shown that the formation of wear-reducing boundary layers is indicated by a characteristic and almost constant value of oil gap impedance.