Frictional compatibility - the performance of the shaft diameter in direct contact with the shaft shingles to prevent the occurrence of adhesion and the formation of boundary lubrication. Material factors affecting the friction compatibility of the friction sub are:
(1) into the sub-material metallurgically constitute the ease of alloy.
(2) Material and lubricant affinity ability.
(3) The friction factor of the material in the non-lubricated state.
(4) The microstructure of the material.
(5) Thermal conductivity of the material.
(6) The size of the surface energy of the material and the characteristics of the oxide film.