THE EFFECT OF FRICTIONALLY GENERATED HEAT ON LUBRICANT TRANSITION

A study was performed to establish the transition temperature of two a dditives in cetane under severe conditions of pressure x velocity, whi ch gave a surface temperature rise within the contact of up to 150-deg rees-C. The interface temperature was measured using the slider as one leg of a thermocouple and the disk as the other; hence, an accurate i nterface temperature could be determined as the velocity and load vari ed. The test specimens were M50 tool steel, AISI 52100 steel and type 440C stainless steel balls against a fully hardened tool steel disc. T he results complemented previous work which showed the identical trend s but at slightly different absolute temperature levels.