Mechanical engineering and machinery TJ1-1570 1 248 Chemistry 696 Engineering (General). Civil engineering (General) 696 Physics 696 QC1-999 696 QD1-999 696 mer ... TA1-2040 696 Agriculture 552 S 552 Agriculture (General) 190 Machine design and drawing 190 S1-972 190 T 190 TJ227-240 190 Technology 190 friction 85 wear 66 tribology 55 boundary lubrication 31 surface roughness 27 tribofilm 22 grease 21 friction coefficient 20 diamond-like carbon 17 adhesion 16 dlc 16 efficiency 16 lubricant 16 lubrication 15 mindre ...