H. Kondo, M. Aoki, J. Seto
Jan 2, 1993
Citations
0
Influential Citations
2
Citations
Journal
Wear
Abstract
Abstract An experimental study has been made on the effect of trilauryl phosphite (TLP) and trilauryl trithiophosphite (TTP) in minimizing friction in order to achieve the required frictional properties of magnetic thin film media. In shuttling motion, both phosphite and thiophosphite change the cobalt(II) surface to cobalt(II) phosphate film and reduce the coefficient of friction, the effect being larger with TTP. TLP and TTP differ from each other in the lubrication mechanism. The lubrication mechanism of TLP involves the elimination of dodecene and the formation of phosphate film by the dehydration of phosphiric acid and cobalt(II) oxide. However, TTP reacts even at ambient temperature by the intramolecular elimination of didodecyl disulphide, then forms phosphate film by intermolecular elimination during shuttling motion. From the results of X-ray photoelectron spectroscopy measurements it is concluded that the effectiveness of TLP and TTP depends on the amount of protective film formed on the rubbing surface. It is also suggested that the temperature at the rubbing surface increases to more than 245 °C.