WEAR AND FRICTION OF OXIDATION-RESISTANT MECHANICAL CARBON-GRAPHITES AT 650° C IN AIR

摘要

Studies were conducted to determine the friction and wear properties of experimental carbon-graphites. Hemispherically tipped carbon-graphite rider specimens were tested in sliding contact with rotating Inconel X-750 disks in air. A surface speed of 1.33 m/sec, a load of 500 g, and a specimen temperature of 650° C were used. Results indicate that hardness is not a major factor in determining friction and wear under the conditions of these studies. Friction and wear as low as or lower than those observed for a good commercial seal material were attained with some of the experimental materials studied. The inclusion of boron carbide (as an oxidation inhibitor) had a strong influence on wear rate. Phosphate treatment reduced the friction coefficient when boron carbide was not present in the base material.