Friction of diamond, graphite, and carbon and the influence of surface films

摘要: This paper describes an experimental study of the frictional behaviour diamond, graphite and carbon which have been outgassed in vacuo . The removal surface films are normally present causes a large increase friction. admission small amount oxygen, water vapour or other contaminant will reduce Both physical adsorption chemical important. There is evidence that with clean surfaces there strong adhesion at interface, so when sliding takes place slip shearing occurs beneath surface. Carbon negative tem perature coefficient low friction observed diamond due to presence adsorbed oxygen gases. on high, shear strength interface comparable diamond. Large-scale seizure does not occur because deformation region contact elastic real area necessarily remains small.