Microstructure and mechanical properties of Ni-based high temperature solid-lubricating composites

The poor mechanical properties are the main obstacle for the present solid-lubricating bulk materials in practical applications. In this work, the microstructure and high temperature mechanical properties of the solid lubricating NiCrMoAl-12.5 wt%Ag-xCaF(2)/BaF2 eutectic (x=5 or 10 wt%) composites, denoted as the 5 F and 10 F respectively, have been evaluated. Both the composites display superior tensile strength of above 300 MPa from room temperature (RT) to 600 degrees C and extraordinary compressive strength that is above 500 MPa at 800 degrees C. These superior properties make the composite particularly suitable for bearing applications where the compression strength is an engineering factor to be preferably considered.