FRICTION STUDIES OF GRAPHITE AND MIXTURES OF GRAPHITE WITH SEVERAL METALLIC OXIDES AND SALTS AT TEMPERATURES TO 1000° F

摘要

An experimental friction study was made using graphite and mix-tures of graphite with load oxide, cadmium oxide, sodium sulfate, or cadmium sulfate as solid lubricants. Runs were made at temperatures up to 1000° F with various steel and Inconel combinations.nGraphite powder lubricated metal surfaces at temperatures suffi¬ciently high to promote oxidation of the metal surfaces. At intermedi¬ate temperatures graphite powder alone failed to function as a lubricant. Graphite would not lubricate cast Inconel on Inconel X at temperatures between approximately 150° and 800° F. Similarly, with steel, which oxi¬dized more readily than Inconel, the temperature below which graphite would not lubricate was 475° r as compared with 800° F for Inconel.nMixtures of metallic compounds and graphite were effective lubri¬cants from room temperature to 1000° F provided no reaction occurred between the metallic compounds and the graphite. A metallic salt mixed with graphite showed friction coefficients similar to those of a resin-bonded film of graphite.