Tribological properties of (Ca, Mg)-Sialon lubricated with various sodium salt solutions

The tribological properties of (Ca, Mg)-Sialon in dry sliding and under various lubricated conditions of sodium salt solutions were investigated by using a SRV ball-on-disk test rig. The results show that all the sodium solutions reduce both the friction coefficients of (Ca, Mg)-Sialon/GCr15 steel pair and the wear volume loss of (Ca, Mg)-Sialon as compared with dry sliding and water lubrication. The wear volume order of (Ca, Mg)-Sialon in dry sliding and under various lubricated conditions of sodium salt solutions was given. the friction coefficient in dry sliding is the largest one. Complicated tribochemical compounds have been produced on both the wear tracks of (Ca, Mg)-Sialon and GCr15 steel, which accounts for the different lubricity of the sodium salt solutions.