MICROSTRUCTURE OF CARBON-GRAPHITE COMPOSITES IMPREGNATED WITH SILVER AND THEIR SEALING FRICTION PROPERTIES

Taking the extra fine petroleum coke powder as basic constituent and adding a bit of complex oxide ceramics powder, a carbon graphite matrix with high strength and wearability was prepared. Its graphitization degree was controlled by selecting suitable heat treatment technology. Densification and strengthening have been achieved using hot isostatic impregnating with silver. The carbon graphite composites impregnated with silver, M209G, exhibits the comprehensive advantages of carbon, graphite, ceramic and silver. X ray diffraction, metalloscope and SEM were used to analyze the effects of the microstructure and surface morphologic of materials on friction wear behaviour, its sealing friction specific properties was also discussed.