ELECTRON SPIN RESONANCE (ESR) SPECTRA OF BUTYLATED HYDROXYTOLUENE (BHT) AS EVIDENCE OF FREE RADICAL FORMATION IN ELECTROSTATIC DISCHARGE (ESD) DAMAGED LUBRICATING OILS

Journal Title: Tribologia - Year 2014, Vol 256, Issue 4

Abstract

Electrostatic discharges were generated in typical ISO VG 46 cSt turbine lubricating oil by passing the oil through a glass fibre filter element at a hydraulic load of 0.06 L*min-1*cm-2. The oil exhibited electrical conductivity of 8 pS*m-1 at 25°C. The experiment was performed at room temperature. The maximum amplitude of ESD arcing events recorded was approximately –500 V. The magnitude of these arcing events was sufficient to generate a free radical formation of the BHT antioxidant additive generally employed as an antioxidant in typical turbine lubricating oil formulations. The free radical formation was evidenced by a clearly observable ESR signal corresponding to the BHT radical as recorded on an X-Band MiniScope MS100 spectrometer with a resonant frequency of 9.43 GHz and a maximum field sweep of 400 mT. These results indicate that ESD can well be responsible for initiating the free radical polymerization process postulated to result in varnish formation in turbine lubricating oils.

Authors and Affiliations

John K. DUCHOWSKI

Keywords

Related Articles

HYDRODYNAMIC THRUST BEARINGS WITH POLYMER LINING

Polymeric linings of sliding surfaces of the hydrodynamic bearings have been used successfully for over 50 years. Despite of their long history of operation and research, they have not become widespread in industrial app...

Przesycanie grzaniem indukcyjnym stopu aluminium 7075

Niniejszy artykuł dotyczy badań przesycania stopu aluminium 7075 metodą indukcyjną. Badania prowadzono w specjalnie zaprojektowanej komorze wypełnionej argonem. W pierwszej kolejności zbadano wpływ mocy i czasu na głębok...

THE EFFECT OF DIFFERENT MIXTURES OF OIL AND REFRIGERANT ON THE SURFACE OF THE SLIDING PISTON COMPRESSORS

Due to valid regulations concerning the application of substances weakening the ozone layer, at present, there is reversion to ecological refrigerants. The purpose of the work was testing the influence of substituting th...

WPŁYW STĘŻENIA CZĄSTEK MAGNETYCZNYCH NA WARTOŚCI PARAMETRÓW EKSPLOATACYJNYCH W POPRZECZNYM ŁOŻYSKU ŚLIZGOWYM SMAROWANYM FERRO-OLEJEM

W niniejszej pracy została przedstawiona analiza zmian podstawowych parametrów eksploatacyjnych poprzecznego łożyska ślizgowego w aspekcie stężenia cząstek magnetycznych w ferro-oleju będącego czynnikiem smarującym. W pi...

PROPERTIES OF ANTI-WEAR COATINGS PRODUCED BY ELECTRO SPARK DEPOSITION

Electro-spark deposition is one of the methods that require concentrated energy flux. The method was first used in the USSR in the 1940s almost simultaneously with destructive electrical discharge machining. The ESD tech...

Download PDF file
  • EP ID EP262709
  • DOI -
  • Views 76
  • Downloads 0

How To Cite

John K. DUCHOWSKI (2014). ELECTRON SPIN RESONANCE (ESR) SPECTRA OF BUTYLATED HYDROXYTOLUENE (BHT) AS EVIDENCE OF FREE RADICAL FORMATION IN ELECTROSTATIC DISCHARGE (ESD) DAMAGED LUBRICATING OILS. Tribologia, 256(4), 43-52. https://europub.co.uk./articles/-A-262709