Lubricating properties of thixotropic systems based on overbased calcium sulphonate

The lubricating properties of model systems based on overbased calcium sulphonate have been studied by simulating various kinematic, temperature, and load-speed conditions of friction machines as well as by investigating the physical chemistry of friction surfaces. It is found that overbased sulphonate complex grease shows good antifriction, antiwear, and extreme-pressure properties. A synergistic action of calcium tetraborate with overbased sulphonate has been shown. It is found that calcium 12-hydroxystearate, however, has little effect on lubricating properties, but it improves the thixotropic characteristics of a system.