Author/Authors :
Kumar، نويسنده , , Nadine N. and Sharma، نويسنده , , Neha and Dash، نويسنده , , S. and Popov، نويسنده , , C. and Kulisch، نويسنده , , W. and Reithmaier، نويسنده , , J.P. and Favaro، نويسنده , , G. and Tyagi، نويسنده , , A.K. and Raj، نويسنده , , Baldev، نويسنده ,
Abstract :
Transformation from higher to ultra low friction coefficient was observed in ultrananocrystalline diamond film (UNCD) while changing the test atmospheric conditions. High friction coefficients were observed in dry argon and nitrogen atmosphere, however, low and ultra low friction coefficients were obtained in dry oxygen and in ambient atmospheric conditions, respectively. Wear rates follow the same trends as the friction coefficients. This fascinating behavior of friction and wear of UNCD film is explained by the chemical changes of sliding surfaces and extent of passivation of dangling covalent bonds.
Keywords :
Ultrananocrystalline diamond , Testing atmosphere , friction coefficient , WEAR
